qifenxian
发表于 2024-1-6 23:07:10
FishC 发表于 2024-1-5 15:15
抱歉,之前的回答有些内容被截断了。根据你提供的代码,该系统是一个教师岗位管理系统,主要由管理员和 ...
private void createManagerOperationPage(Stage stage){
Pane MangerOperationRoot = new Pane();
Image backgroundImage = new Image("file:src/main/java/img/beijing.jpg");
ImageView backgroundView = new ImageView(backgroundImage);
backgroundView.setFitWidth(800);
backgroundView.setFitHeight(600);
MangerOperationRoot.getChildren().add(backgroundView);
// 创建菜单栏
MenuBar menuBar = new MenuBar();
Menu exitMenu = new Menu("退出系统");
MenuItem exitMenuItem = new MenuItem("退出系统");
exitMenu.getItems().add(exitMenuItem);
exitMenuItem.setOnAction(actionEvent -> {
stage.setScene(root.getScene());
});
Menu queryFlowerMenu = new Menu("查询鲜花");
MenuItem queryFlowerItem = new MenuItem("查询");
queryFlowerMenu.getItems().add(queryFlowerItem);
queryFlowerItem.setOnAction(actionEvent -> {
MangerOperationRoot.getChildren().removeIf(node -> node != menuBar && node != backgroundView);
queryFlower(MangerOperationRoot,0);
});
Menu addFlowerMenu = new Menu("增加鲜花");
MenuItem addFlowItem = new MenuItem("增加鲜花");
MenuItem addStockFlowItem = new MenuItem("进货");
addFlowerMenu.getItems().addAll(addFlowItem,addStockFlowItem);
addFlowItem.setOnAction(actionEvent -> {
MangerOperationRoot.getChildren().removeIf(node -> node != menuBar && node != backgroundView);
addFlow(MangerOperationRoot);
});
addStockFlowItem.setOnAction(actionEvent -> {
MangerOperationRoot.getChildren().removeIf(node -> node != menuBar && node != backgroundView);
purchase(MangerOperationRoot);
});
Menu deleteFlowerMenu = new Menu("删除鲜花");
MenuItem deleteFlowItem = new MenuItem("删除鲜花");
deleteFlowerMenu.getItems().add(deleteFlowItem);
deleteFlowItem.setOnAction(actionEvent -> {
MangerOperationRoot.getChildren().removeIf(node -> node != menuBar && node != backgroundView);
deleteFlower(MangerOperationRoot);
});
Menu changeFlowMenu = new Menu("修改鲜花");
MenuItem changeFlowItem = new MenuItem("修改鲜花");
changeFlowMenu.getItems().add(changeFlowItem);
changeFlowItem.setOnAction(actionEvent -> {
MangerOperationRoot.getChildren().removeIf(node -> node != menuBar && node != backgroundView);
changeFlower(MangerOperationRoot);
});
Menu financialStatement = new Menu("财务报表");
MenuItem financialStatementItem = new MenuItem("查看财务报表");
financialStatement.getItems().add(financialStatementItem);
financialStatementItem.setOnAction(actionEvent -> {
MangerOperationRoot.getChildren().removeIf(node -> node != menuBar && node != backgroundView);
seeFinancialStatement(MangerOperationRoot);
});
Menu manageAccountMenu = new Menu("管理账号");
MenuItem addAccountItem = new MenuItem("添加管理员");
addAccountItem.setOnAction(actionEvent -> {
MangerOperationRoot.getChildren().removeIf(node -> node != menuBar && node != backgroundView);
TextInputDialog dialog = new TextInputDialog();
dialog.setTitle("请输入用户名");
dialog.setHeaderText("请输入用户名:");
String userName = dialog.showAndWait().orElse("");
Connection connection = null;
try {
connection = DriverManager.getConnection(url, user, dbPassword);
} catch (SQLException e) {
throw new RuntimeException(e);
}
if (!userName.isEmpty()) {
// 添加查询语句,查询数据库中是否存在该用户名
String querySql = "SELECT * FROM usertable WHERE username = ?";
try (PreparedStatement queryStatement = connection.prepareStatement(querySql)) {
queryStatement.setString(1, userName);
ResultSet resultSet = queryStatement.executeQuery();
if (!resultSet.next()) {
// 如果查询结果为空,则弹出提示框提醒无此账号
Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.setTitle("提示");
alert.setHeaderText(null);
alert.setContentText("无此账号");
alert.showAndWait();
}
} catch (SQLException e) {
e.printStackTrace();
}
String updateSql = "UPDATE usertable SET rightcontrol = ? WHERE username = ?";
try (PreparedStatement updateStatement = connection.prepareStatement(updateSql)) {
updateStatement.setInt(1, 0);
updateStatement.setString(2, userName);
updateStatement.executeUpdate();
// 如果查询结果为空,则弹出提示框提醒无此账号
Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.setTitle("提示");
alert.setHeaderText(null);
alert.setContentText("添加成功");
alert.showAndWait();
} catch (SQLException e) {
e.printStackTrace();
}
}
});
MenuItem deleteAccountItem = new MenuItem("删除管理员");
manageAccountMenu.getItems().addAll(addAccountItem,deleteAccountItem);
deleteAccountItem.setOnAction(actionEvent -> {
MangerOperationRoot.getChildren().removeIf(node -> node != menuBar && node != backgroundView);
TextInputDialog dialog = new TextInputDialog();
dialog.setTitle("请输入用户名");
dialog.setHeaderText("请输入用户名:");
String userName = dialog.showAndWait().orElse("");
Connection connection = null;
try {
connection = DriverManager.getConnection(url, user, dbPassword);
} catch (SQLException e) {
throw new RuntimeException(e);
}
if (!userName.isEmpty()) {
if (userName.equals("000001")){
// 如果查询结果为空,则弹出提示框提醒无此账号
Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.setTitle("提示");
alert.setHeaderText(null);
alert.setContentText("该账号不可被删除");
alert.showAndWait();
}else{
// 添加查询语句,查询数据库中是否存在该用户名
String querySql = "SELECT * FROM usertable WHERE username = ?";
try (PreparedStatement queryStatement = connection.prepareStatement(querySql)) {
queryStatement.setString(1, userName);
ResultSet resultSet = queryStatement.executeQuery();
if (!resultSet.next()) {
// 如果查询结果为空,则弹出提示框提醒无此账号
Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.setTitle("提示");
alert.setHeaderText(null);
alert.setContentText("无此账号");
alert.showAndWait();
}
} catch (SQLException e) {
e.printStackTrace();
}
String updateSql = "UPDATE usertable SET rightcontrol = ? WHERE username = ?";
try (PreparedStatement updateStatement = connection.prepareStatement(updateSql)) {
updateStatement.setInt(1, 1);
updateStatement.setString(2, userName);
updateStatement.executeUpdate();
// 如果查询结果为空,则弹出提示框提醒无此账号
Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.setTitle("提示");
alert.setHeaderText(null);
alert.setContentText("删除成功");
alert.showAndWait();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
});
menuBar.getMenus().addAll(exitMenu,addFlowerMenu,deleteFlowerMenu,changeFlowMenu,queryFlowerMenu,manageAccountMenu,financialStatement);
MangerOperationRoot.getChildren().add(menuBar);
Scene MangerOperationScene = new Scene(MangerOperationRoot,800,600);
stage.setScene(MangerOperationScene);
}
private void seeFinancialStatement(Pane managerOperationRoot) {
BorderPane borderPane = new BorderPane();
TableView<Flower> financialTable = new TableView<>();
TableColumn<Flower, String> idColumn = new TableColumn<>("ID");
idColumn.setCellValueFactory(new PropertyValueFactory<>("id"));
TableColumn<Flower, String> flowerNameColumn = new TableColumn<>("Flower Name");
flowerNameColumn.setCellValueFactory(new PropertyValueFactory<>("flowername"));
TableColumn<Flower, Integer> priceColumn = new TableColumn<>("Price");
priceColumn.setCellValueFactory(new PropertyValueFactory<>("price"));
TableColumn<Flower, Integer> stockColumn = new TableColumn<>("Stock");
stockColumn.setCellValueFactory(new PropertyValueFactory<>("stock"));
TableColumn<Flower, Integer> salesVolumeColumn = new TableColumn<>("Sales Volume");
salesVolumeColumn.setCellValueFactory(new PropertyValueFactory<>("salesvolume"));
TableColumn<Flower, Integer> purchasingPriceColumn = new TableColumn<>("Purchasing Price");
purchasingPriceColumn.setCellValueFactory(new PropertyValueFactory<>("purchasingPrice"));
TableColumn<Flower, Integer> profitColumn = new TableColumn<>("Profit");
profitColumn.setCellValueFactory(new PropertyValueFactory<>("profit"));
TableColumn<Flower, Integer> totalProfitColumn = new TableColumn<>("Total Profit");
totalProfitColumn.setCellValueFactory(new PropertyValueFactory<>("totalprofit"));
// 添加列到表格
financialTable.getColumns().addAll(idColumn, flowerNameColumn, priceColumn, stockColumn, salesVolumeColumn, purchasingPriceColumn, profitColumn, totalProfitColumn);
// 从数据库中获取财务报表数据
List<Flower> financialRecords = getFinancialRecordsFromDatabase();
// 将数据添加到表格中
financialTable.getItems().addAll(financialRecords);
// 将表格放在布局的中间位置
borderPane.setCenter(financialTable);
// 将布局添加到界面中
managerOperationRoot.getChildren().add(borderPane);
}修改代码,禁止表格遮挡菜单栏
FishC
发表于 2024-1-6 23:07:26
qifenxian 发表于 2024-01-06 23:07
private void createManagerOperationPage(Stage stag ...
好的,要禁止表格遮挡菜单栏,你可以将菜单栏放在布局的顶部,并将表格放在布局的中间区域。这样,菜单栏就会一直显示在顶部,而不会被表格遮挡。
下面是修改后的代码示例:
private void createManagerOperationPage(Stage stage){
Pane ManagerOperationRoot = new Pane();
Image backgroundImage = new Image("file:src/main/java/img/beijing.jpg");
ImageView backgroundView = new ImageView(backgroundImage);
backgroundView.setFitWidth(800);
backgroundView.setFitHeight(600);
ManagerOperationRoot.getChildren().add(backgroundView);
BorderPane borderPane = new BorderPane();
// 创建菜单栏
MenuBar menuBar = new MenuBar();
Menu exitMenu = new Menu("退出系统");
MenuItem exitMenuItem = new MenuItem("退出系统");
exitMenu.getItems().add(exitMenuItem);
exitMenuItem.setOnAction(actionEvent -> {
stage.setScene(root.getScene());
});
//...
// 其他菜单项的创建
menuBar.getMenus().addAll(exitMenu, addFlowerMenu, deleteFlowerMenu, changeFlowMenu, queryFlowerMenu, manageAccountMenu, financialStatement);
// 将菜单栏放在布局的顶部
borderPane.setTop(menuBar);
TableView financialTable = new TableView();
// ...
// 将表格放在布局的中间位置
borderPane.setCenter(financialTable);
ManagerOperationRoot.getChildren().add(borderPane);
Scene ManagerOperationScene = new Scene(ManagerOperationRoot, 800, 600);
stage.setScene(ManagerOperationScene);
}
通过将菜单栏放在布局的顶部,表格放在布局的中间位置,你可以确保菜单栏一直显示在最顶部,并且不会被表格遮挡。希望对你有所帮助!如果还有其他问题,请随时提问。
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-3-26 21:52:53
@FishC
实验目的:在MySQL中创建一张表,之后使用JDBC进行增删查改。
(1)表设计:数据内容自定义,给出创建表的数据库语句
(2)JDBC连接到MySQL,数据库驱动为8.0.33,给出需要添加的依赖
(3)在index.jsp中心位置设计四个超链接,分别对应suc.jsp、delete.jsp、insert.jsp、query.jsp,
(3.5)在suc.jsp页面列出表中所有记录,每行记录后面有删除链接,链接中附加username字段,单击后跳转到delete.jsp。另有插入、查询按钮,单击后分别跳转到insert.jsp、query.jsp。
(4)delete.jsp页面:从URL中提取username字段,删除数据库表中该username对应的记录。删除成功后,显示删除成功,之后重定向到list.jsp。
(5)insert.jsp:设计表单,单击提交按钮后,插入到数据库表中。插入成功后,显示插入成功,设计3秒后返回,重定向到suc.jsp,并刷新页面显示最新数据。
(6)query.jsp:设计表单,比如查询姓名,单击查询按钮后,检索数据库表记录,用列表显示结果。
为上述实验项目编写代码
FishC
发表于 2024-3-26 21:53:14
zqy173590939 发表于 2024-03-26 21:52
@FishC
实验目的:在MySQL中创建一张表,之后使用JDB ...
(1)表设计:假设要创建一个名为"students"的表,包含三个字段:id、name、age。
CREATE TABLE students(
id INT PRIMARY KEY AUTO_INCREMENT,
name VARCHAR(50),
age INT
);
(2)JDBC连接到MySQL,需要添加mysql-connector-java依赖。在项目的pom.xml文件中添加以下内容:
<dependencies>
...
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
...
</dependencies>
(3)index.jsp:
<!DOCTYPE html>
<html>
<head>
<title>Index</title>
</head>
<body>
<div align="center">
<h1>Welcome to the Student Management System</h1>
<br>
<a href="suc.jsp">View All Students</a><br>
<a href="delete.jsp">Delete Student</a><br>
<a href="insert.jsp">Insert Student</a><br>
<a href="query.jsp">Query Students</a><br>
</div>
</body>
</html>
(3.5)suc.jsp:
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/testdatabase", "root", "password");
stmt = conn.createStatement();
rs = stmt.executeQuery("SELECT * FROM students");
out.println("<table border='1'>");
out.println("<tr><td>ID</td><td>Name</td><td>Age</td><td>Delete</td></tr>");
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age");
out.println("<tr><td>" + id + "</td><td>" + name + "</td><td>" + age + "</td><td><a href='delete.jsp?username=" + name + "'>Delete</a></td></tr>");
}
out.println("</table>");
out.println("<br>");
out.println("<form action='insert.jsp' method='get'>");
out.println("<input type='submit' value='Insert'>");
out.println("</form>");
out.println("<br>");
out.println("<form action='query.jsp' method='get'>");
out.println("Name: <input type='text' name='name'>");
out.println("<input type='submit' value='Query'>");
out.println("</form>");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if(rs != null) {
rs.close();
}
if(stmt != null) {
stmt.close();
}
if(conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
%>
(4)delete.jsp:
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%
String username = request.getParameter("username");
Connection conn = null;
Statement stmt = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/testdatabase", "root", "password");
stmt = conn.createStatement();
stmt.executeUpdate("DELETE FROM students WHERE name='" + username + "'");
out.println("Delete successful!");
response.sendRedirect("suc.jsp");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if(stmt != null) {
stmt.close();
}
if(conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
%>
(5)insert.jsp:
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%
String name = request.getParameter("name");
String age = request.getParameter("age");
Connection conn = null;
Statement stmt = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/testdatabase", "root", "password");
stmt = conn.createStatement();
stmt.executeUpdate("INSERT INTO students(name, age) VALUES('" + name + "', " + age + ")");
out.println("Insert successful!");
response.setHeader("Refresh", "3; URL=suc.jsp");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if(stmt != null) {
stmt.close();
}
if(conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
%>
(6)query.jsp:
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%
String name = request.getParameter("name");
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/testdatabase", "root", "password");
stmt = conn.createStatement();
rs = stmt.executeQuery("SELECT * FROM students WHERE name = '" + name + "'");
out.println("<table border='1'>");
out.println("<tr><td>ID</td><td>Name</td><td>Age</td></tr>");
while (rs.next()) {
int id = rs.getInt("id");
String studentName = rs.getString("name");
int age = rs.getInt("age");
out.println("<tr><td>" + id + "</td><td>" + studentName + "</td><td>" + age + "</td></tr>");
}
out.println("</table>");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if(rs != null) {
rs.close();
}
if(stmt != null) {
stmt.close();
}
if(conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
%>
希望以上代码能够帮助您完成实验项目。请注意,为了简化问题,我假设数据库名为testdatabase,并且用户名为root,密码为password。在实际应用中,请根据自己的实际情况进行相应修改。此外,为了简单起见,上述代码没有考虑安全性和异常处理等方面的问题,实际开发中需要进行适当的改进。
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-3-26 22:40:35
FishC 发表于 2024-3-26 21:53
(1)表设计:假设要创建一个名为"students"的表,包含三个字段:id、name、age。
CREATE TABLE stu ...
@FishC
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%
String name = request.getParameter("name");
String age = request.getParameter("age");
Connection conn = null;
Statement stmt = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/javaweb?useUnicode=true&characterEncoding=UTF-8", "root", "123456");
stmt = conn.createStatement();
stmt.executeUpdate("INSERT INTO students(name, age) VALUES('" + name + "', " + age + ")");
out.println("Insert successful!");
response.setHeader("Refresh", "3; URL=suc.jsp");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if(stmt != null) {
stmt.close();
}
if(conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
%>
修改代码,insert.jsp目前没有实际功能,在suc.jsp点击insert转跳至adddata.jsp,根据数据库表:
CREATE TABLE students(
id INT PRIMARY KEY AUTO_INCREMENT,
name VARCHAR(50),
age INT
);
的样式,设计输入框,用户输入数据后,点击提交,把数据保存到数据库中,并跳至insert.jsp界面,显示insert successful,三秒后自动转跳回suc.jsp,刷新界面显示最新数据
FishC
发表于 2024-3-26 22:40:56
zqy173590939 发表于 2024-03-26 22:40
@FishC
修改代码,insert.jsp目前没 ...
首先,您需要在adddata.jsp页面添加输入框和提交按钮,以便用户输入数据并保存到数据库中。然后,在insert.jsp页面中显示插入成功的消息,并设置页面自动跳转回suc.jsp页面。
下面是一个示例代码:
adddata.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Add Data</title>
</head>
<body>
<h1>Add Data</h1>
<form action="insert.jsp" method="post">
<label>Name:</label>
<input type="text" name="name" required><br>
<label>Age:</label>
<input type="number" name="age" required><br>
<input type="submit" value="Submit">
</form>
</body>
</html>
insert.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert</title>
</head>
<body>
<%
String name = request.getParameter("name");
int age = Integer.parseInt(request.getParameter("age"));
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/test";
String user = "root";
String password = "123456";
try {
Class.forName(driver);
Connection conn = DriverManager.getConnection(url, user, password);
String insertSql = "INSERT INTO students (name, age) VALUES (?, ?)";
PreparedStatement pstmt = conn.prepareStatement(insertSql);
pstmt.setString(1, name);
pstmt.setInt(2, age);
pstmt.executeUpdate();
pstmt.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
%>
<h1>Insert Successful</h1>
<script>
setTimeout(function() {
window.location.href = "suc.jsp";
}, 3000);
</script>
</body>
</html>
在这个示例中,我们首先从adddata.jsp页面获取用户输入的姓名和年龄,然后使用JDBC连接到数据库,并将数据插入students表。当插入成功后,我们在insert.jsp页面显示"Insert Successful"消息,并在3秒后自动跳转回suc.jsp页面。
您需要将示例代码中的数据库连接属性(driver, url, user, password)根据您的实际情况进行修改。同时,确保已经导入了MySQL的JDBC驱动程序。
希望这个示例代码能帮助到您。如果有任何问题,请随时提问。
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-3-26 22:49:16
@FishC
CREATE TABLE students(
id INT PRIMARY KEY AUTO_INCREMENT,
name VARCHAR(50),
age INT
);
数据库表格已经设计完成。
实验目的:在MySQL中创建一张表,之后使用JDBC进行增删查改。
(1)表设计:数据内容自定义,给出创建表的数据库语句
(2)JDBC连接到MySQL,数据库驱动为8.0.33,给出需要添加的依赖
(3)在index.jsp中心位置设计四个超链接,分别对应suc.jsp、delete.jsp、insert.jsp、query.jsp,
(3.5)在suc.jsp页面列出表中所有记录,每行记录后面有删除链接,链接中附加username字段,单击后跳转到delete.jsp。另有插入、查询按钮,单击后分别跳转到insert.jsp、query.jsp。
(4)delete.jsp页面:从URL中提取username字段,删除数据库表中该username对应的记录。删除成功后,显示删除成功,之后重定向到list.jsp。
(5)insert.jsp:设计表单。在suc.jsp点击insert转跳至adddata.jsp界面,该界面中有数据输入文本框,单击提交按钮后,插入到数据库表中。插入成功后转跳至insert.jsp,显示插入成功,设计3秒后返回,重定向到suc.jsp,并刷新页面显示最新数据。
(6)query.jsp:设计表单,比如查询姓名,单击查询按钮后,检索数据库表记录,用列表显示结果。
要求全程编码格式支持utf8
为上述实验项目编写代码
FishC
发表于 2024-3-26 22:49:42
zqy173590939 发表于 2024-03-26 22:49
@FishC
CREATE TABLE students(
id INT PRIMARY ...
(1) 创建表的数据库语句:
CREATE TABLE students(
id INT PRIMARY KEY AUTO_INCREMENT,
name VARCHAR(50) CHARACTER SET utf8,
age INT
) CHARACTER SET utf8;
(2) JDBC连接MySQL所需的依赖,可以在项目的pom.xml文件中添加如下依赖:
<!-- MySQL Connector/J -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
(3) 在index.jsp中,设计四个超链接:
<a href="suc.jsp">显示表格记录</a>
<a href="delete.jsp">删除记录</a>
<a href="insert.jsp">插入记录</a>
<a href="query.jsp">查询记录</a>
(3.5) 在suc.jsp页面列出表中所有记录,并为每行记录后面添加删除链接、插入按钮和查询按钮:
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ page import="java.sql.*, javax.sql.*" %>
<%
// 连接数据库
Class.forName("com.mysql.cj.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/databaseName?useUnicode=true&characterEncoding=utf8";
String username = "yourUsername";
String password = "yourPassword";
Connection conn = DriverManager.getConnection(url, username, password);
// 查询数据并显示在页面上
Statement stmt = conn.createStatement();
String sql = "SELECT * FROM students";
ResultSet rs = stmt.executeQuery(sql);
%>
<table>
<tr>
<th>ID</th>
<th>姓名</th>
<th>年龄</th>
<th>操作</th>
</tr>
<% while (rs.next()) { %>
<tr>
<td><%= rs.getInt("id") %></td>
<td><%= rs.getString("name") %></td>
<td><%= rs.getInt("age") %></td>
<td><a href="delete.jsp?username=<%= rs.getString("name") %>">删除</a></td>
</tr>
<% } %>
</table>
<a href="insert.jsp">插入</a>
<a href="query.jsp">查询</a>
<%
// 关闭连接
rs.close();
stmt.close();
conn.close();
%>
(4) delete.jsp页面:从URL中提取username字段,删除数据库表中该username对应的记录,删除成功后,显示删除成功,之后重定向到list.jsp。
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ page import="java.sql.*, javax.sql.*" %>
<%
// 从URL中提取username字段
String username = request.getParameter("username");
if (username != null) {
// 连接数据库
Class.forName("com.mysql.cj.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/databaseName?useUnicode=true&characterEncoding=utf8";
String dbUsername = "yourUsername";
String dbPassword = "yourPassword";
Connection conn = DriverManager.getConnection(url, dbUsername, dbPassword);
// 删除记录
String sql = "DELETE FROM students WHERE name = ?";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, username);
pstmt.executeUpdate();
// 关闭连接
pstmt.close();
conn.close();
}
%>
<h1>删除成功!</h1>
<%
response.sendRedirect("list.jsp");
%>
(5) insert.jsp:设计表单,在suc.jsp点击插入转跳至insert.jsp界面,该界面中有数据输入文本框,单击提交按钮后,插入到数据库表中。插入成功后转跳至insert.jsp,显示插入成功,设计3秒后返回,重定向到suc.jsp,并刷新页面显示最新数据。
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ page import="java.sql.*, javax.sql.*, java.util.Timer, java.util.TimerTask" %>
<%
// 从suc.jsp页面获取插入的数据
String name = request.getParameter("name");
String age = request.getParameter("age");
if (name != null && age != null) {
// 连接数据库
Class.forName("com.mysql.cj.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/databaseName?useUnicode=true&characterEncoding=utf8";
String dbUsername = "yourUsername";
String dbPassword = "yourPassword";
Connection conn = DriverManager.getConnection(url, dbUsername, dbPassword);
// 插入记录
String sql = "INSERT INTO students (name, age) VALUES (?, ?)";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, name);
pstmt.setInt(2, Integer.parseInt(age));
pstmt.executeUpdate();
// 关闭连接
pstmt.close();
conn.close();
// 计时器,延迟3秒后重定向到suc.jsp
Timer timer = new Timer();
TimerTask task = new TimerTask() {
public void run() {
try {
response.sendRedirect("suc.jsp");
} catch (Exception e) {
e.printStackTrace();
}
}
};
timer.schedule(task, 3000);
}
%>
<h1>插入成功!</h1>
<form action="insert.jsp" method="post">
姓名:<input type="text" name="name"><br>
年龄:<input type="text" name="age"><br>
<input type="submit" value="提交">
</form>
(6) query.jsp:设计表单,比如查询姓名,单击查询按钮后,检索数据库表记录,用列表显示结果。
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ page import="java.sql.*, javax.sql.*" %>
<%
String keyword = request.getParameter("keyword");
if (keyword != null) {
// 连接数据库
Class.forName("com.mysql.cj.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/databaseName?useUnicode=true&characterEncoding=utf8";
String username = "yourUsername";
String password = "yourPassword";
Connection conn = DriverManager.getConnection(url, username, password);
// 查询数据并显示在页面上
String sql = "SELECT * FROM students WHERE name LIKE ?";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, "%" + keyword + "%");
ResultSet rs = pstmt.executeQuery();
%>
<ul>
<% while (rs.next()) { %>
<li><%= rs.getString("name") %></li>
<% } %>
</ul>
<%
// 关闭连接
rs.close();
pstmt.close();
conn.close();
}
%>
<form action="query.jsp" method="get">
查询姓名:<input type="text" name="keyword">
<input type="submit" value="查询">
</form>
以上是给出的一个简单示例,仅供参考。您可以根据实际需求进行适当修改和完善。请注意替换代码中的数据库连接信息(url、username、password)和数据库名(databaseName)。
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-3-26 22:56:37
@FishC
CREATE TABLE students(
id INT PRIMARY KEY AUTO_INCREMENT,
name VARCHAR(50),
age INT
);
数据库表格已经设计完成。
实验目的:在MySQL中创建一张表,之后使用JDBC进行增删查改。
(1)表设计:数据内容自定义,给出创建表的数据库语句
(2)JDBC连接到MySQL,数据库驱动为8.0.33,给出需要添加的依赖
(3)在index.jsp中心位置设计四个超链接,分别对应suc.jsp、delete.jsp、insert.jsp、query.jsp,
(3.5)在suc.jsp页面列出表中所有记录,每行记录后面有删除链接,链接中附加username字段,单击后跳转到delete.jsp。另有插入、查询按钮,单击后分别跳转到insert.jsp、query.jsp。
(4)delete.jsp页面:从URL中提取username字段,删除数据库表中该username对应的记录。删除成功后,显示删除成功,之后重定向到list.jsp。
(5)adddata.jsp和insert.jsp:设计表单。在suc.jsp点击insert转跳至adddata.jsp界面,该界面中有数据输入文本框,单击提交按钮后,插入到数据库表中。在adddata.jsp界面插入成功后转跳至insert.jsp,显示插入成功,设计3秒后返回,重定向到suc.jsp,并刷新页面显示最新数据。如果插入失败则在insert.jsp输出插入失败。
(6)query.jsp:设计表单,比如查询姓名,单击查询按钮后,检索数据库表记录,用列表显示结果。
要求全程编码格式支持utf8
为上述实验项目编写代码
FishC
发表于 2024-3-26 22:57:10
zqy173590939 发表于 2024-03-26 22:56
@FishC
CREATE TABLE students(
id INT PRIMARY ...
(1) 表设计:
CREATE TABLE students(
id INT PRIMARY KEY AUTO_INCREMENT,
name VARCHAR(50),
age INT
);
(2) JDBC连接到MySQL,需要添加MySQL的Java驱动依赖,可以使用以下Maven依赖项:
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
(3) 在index.jsp中心位置设计四个超链接:
<a href="suc.jsp">显示记录</a>
<a href="delete.jsp?username=xxx">删除记录</a>
<a href="insert.jsp">插入记录</a>
<a href="query.jsp">查询记录</a>
其中,"xxx"需要替换为要删除的记录的username。
(3.5) 在suc.jsp页面列出表中所有记录:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%
// 数据库连接信息
String url = "jdbc:mysql://localhost:3306/your_database_name?useUnicode=true&characterEncoding=UTF-8";
String username = "your_username";
String password = "your_password";
// 查询数据库中的记录
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(url, username, password);
Statement stmt = conn.createStatement();
String sql = "SELECT * FROM students";
ResultSet rs = stmt.executeQuery(sql);
// 显示记录
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age");
out.println("ID: " + id + "<br>");
out.println("姓名: " + name + "<br>");
out.println("年龄: " + age + "<br>");
// 删除链接
String deleteUrl = "delete.jsp?username=" + name;
out.println("<a href='" + deleteUrl + "'>删除</a>");
out.println("<hr>");
}
rs.close();
stmt.close();
conn.close();
} catch (Exception e) {
out.println("数据库连接失败:" + e.getMessage());
}
%>
<form action="insert.jsp" method="get">
<input type="submit" value="插入">
</form>
<form action="query.jsp" method="get">
<input type="submit" value="查询">
</form>
(4) delete.jsp页面:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%
// 数据库连接信息
String url = "jdbc:mysql://localhost:3306/your_database_name?useUnicode=true&characterEncoding=UTF-8";
String username = "your_username";
String password = "your_password";
// 获取待删除的用户名
String deleteUsername = request.getParameter("username");
// 删除记录
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(url, username, password);
Statement stmt = conn.createStatement();
String sql = "DELETE FROM students WHERE name = '" + deleteUsername + "'";
int result = stmt.executeUpdate(sql);
if (result > 0) {
out.println("删除成功!");
} else {
out.println("删除失败!");
}
stmt.close();
conn.close();
} catch (Exception e) {
out.println("数据库连接失败:" + e.getMessage());
}
%>
<meta http-equiv="refresh" content="3;url=suc.jsp">
(5) adddata.jsp和insert.jsp:
adddata.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%
// 数据库连接信息
String url = "jdbc:mysql://localhost:3306/your_database_name?useUnicode=true&characterEncoding=UTF-8";
String username = "your_username";
String password = "your_password";
// 获取表单数据
String name = request.getParameter("name");
int age = Integer.parseInt(request.getParameter("age"));
// 插入记录
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(url, username, password);
Statement stmt = conn.createStatement();
String sql = "INSERT INTO students (name, age) VALUES ('" + name + "', " + age + ")";
int result = stmt.executeUpdate(sql);
response.sendRedirect("insert.jsp");
} catch (Exception e) {
out.println("数据库连接失败:" + e.getMessage());
}
%>
insert.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%
// 数据库连接信息
String url = "jdbc:mysql://localhost:3306/your_database_name?useUnicode=true&characterEncoding=UTF-8";
String username = "your_username";
String password = "your_password";
// 显示插入成功信息
String message = request.getParameter("message");
if (message != null && !message.isEmpty()) {
out.println(message);
}
// 显示表单
out.println("<form action='adddata.jsp' method='post'>");
out.println("姓名:<input type='text' name='name'><br>");
out.println("年龄:<input type='text' name='age'><br>");
out.println("<input type='submit' value='提交'>");
out.println("</form>");
// 刷新按钮
out.println("<form action='suc.jsp' method='get'>");
out.println("<input type='submit' value='刷新'>");
out.println("</form>");
%>
(6) query.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%
// 数据库连接信息
String url = "jdbc:mysql://localhost:3306/your_database_name?useUnicode=true&characterEncoding=UTF-8";
String username = "your_username";
String password = "your_password";
// 获取查询关键字
String keyword = request.getParameter("keyword");
// 查询记录
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(url, username, password);
Statement stmt = conn.createStatement();
String sql = "SELECT * FROM students WHERE name LIKE '%" + keyword + "%'";
ResultSet rs = stmt.executeQuery(sql);
// 显示查询结果
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age");
out.println("ID: " + id + "<br>");
out.println("姓名: " + name + "<br>");
out.println("年龄: " + age + "<br>");
out.println("<hr>");
}
rs.close();
stmt.close();
conn.close();
} catch (Exception e) {
out.println("数据库连接失败:" + e.getMessage());
}
%>
<form action="query.jsp" method="get">
姓名关键字:<input type="text" name="keyword">
<input type="submit" value="查询">
</form>
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-3-28 16:55:07
@FishC
一、实验目的
1、掌握JDBC增删查改MySQL或者sql server数据库表的方法。
2、在增删查改页面间跳转
二、实验内容
在MySQL或者sql server中创建一张表,之后使用JDBC进行增删查改。(功能不限),包括:
(1)表设计
(2)JDBC连接到MySQL 或者sql server
(3)suc.jsp页面列出表中所有记录。每行记录后面有删除链接,链接中附加username字段,单击后跳转到delete.jsp。另有插入、查询按钮,单击后分别跳转到insert.jsp、query.jsp。
(4)delete.jsp页面:从URL中提取username字段,删除数据库表中该username对应的记录。删除成功后,显示删除成功,之后重定向到list.jsp。
(5)insert.jsp:设计表单,单击提交按钮后,插入到数据库表中。插入成功后,显示插入成功, 之后重定向到list.jsp。
(6)query.jsp:设计表单,比如查询姓名,单击查询按钮后,检索数据库表记录,用列表显示结果。
三、实验成果
(按序编号列出各项,截图代码及运行结果以验证)
1、数据库表设计截图
数据库表设计如下:
2、效果展示及截图
演示效果:
一共使用了六个页面:
index.jsp是初始界面,也是欢迎界面,包含转跳至suc,jsp、delete.jsp、insert.jsp、query.jsp四个界面的超链接。
suc,jsp是数据库浏览界面,在此界面可以管理(添加,插入,删除)信息。
根据实验要求,点击删除按钮可直接删除对应行的个人信息。
对32行点击删除,弹出提示信息:
3秒后自动转跳会suc.jsp页面,并显示更新后的信息。
点击插入,转跳至insert.jsp页面。
输入要添加的信息,点击提交:
点击提交后回到insert.jsp页面:
此时点击刷新回到suc.jsp并显示刷新后的数据:
点击查询按钮,转跳至query.jsp页面:
输入我们需要查询的数据:
点击提交进行查询:
根据查询结果可以看出此处是支持模糊查询的。
上述是一次Javaweb实验,用第一人称视角进行实验总结
FishC
发表于 2024-3-28 16:55:38
zqy173590939 发表于 2024-03-28 16:55
@FishC
一、实验目的
1、掌握JDBC增删查改MySQL或 ...
看起来你已经成功完成了JDBC连接MySQL或SQL Server数据库,并且实现了增删查改的功能。这是一个很好的成果!以下是回答你提到问题的解决方案。
1. 首先,关于数据库表的设计,你可以使用MySQL Workbench或SQL Server Management Studio等工具进行表设计。根据你的需求,选择合适的字段和数据类型创建表。
2. 关于JDBC连接数据库的方法,你可以使用以下代码示例:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBUtil {
private static final String URL = "jdbc:mysql://localhost:3306/my_db"; // MySQL数据库的URL
private static final String USERNAME = "root";
private static final String PASSWORD = "123456";
public static Connection getConnection() {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver"); // 加载MySQL驱动
conn = DriverManager.getConnection(URL, USERNAME, PASSWORD); // 建立数据库连接
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
}
其中`URL`、`USERNAME`和`PASSWORD`需要根据你的数据库配置进行修改。
3. 在`suc.jsp`页面中列出表中所有记录并实现删除功能,你可以使用以下代码示例:
<%@ page import="java.sql.*" %>
<%
Connection conn = DBUtil.getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM my_table");
while (rs.next()) {
String username = rs.getString("username");
String deleteURL = "delete.jsp?username=" + username;
%>
<p><%= username %> [<a href="<%= deleteURL %>">删除</a>]</p>
<%
}
rs.close();
stmt.close();
conn.close();
%>
此代码从数据库中查询所有记录,并将每个记录的用户名和相应的删除链接输出到页面上。
4. 在`delete.jsp`页面中删除指定的记录,可以使用以下代码示例:
<%@ page import="java.sql.*" %>
<%
String username = request.getParameter("username");
Connection conn = DBUtil.getConnection();
Statement stmt = conn.createStatement();
stmt.executeUpdate("DELETE FROM my_table WHERE username = '" + username + "'");
response.sendRedirect("suc.jsp?msg=删除成功");
%>
该代码解析URL中的用户名参数,然后连接数据库并执行相应的删除操作。删除成功后,使用`response.sendRedirect()`将用户重定向到`suc.jsp`页面,并显示成功删除的消息。
5. 在`insert.jsp`页面中插入记录,可以使用以下代码示例:
<%@ page import="java.sql.*" %>
<%
String username = request.getParameter("username");
String password = request.getParameter("password");
Connection conn = DBUtil.getConnection();
Statement stmt = conn.createStatement();
stmt.executeUpdate("INSERT INTO my_table (username, password) VALUES ('" + username + "', '" + password + "')");
response.sendRedirect("suc.jsp?msg=插入成功");
%>
该代码从表单中获取用户名和密码参数,并将它们插入到数据库表中。插入成功后,使用`response.sendRedirect()`将用户重定向到`suc.jsp`页面,并显示成功插入的消息。
6. 在`query.jsp`页面中查询记录,可以使用以下代码示例:
<%@ page import="java.sql.*" %>
<%
String keyword = request.getParameter("keyword");
Connection conn = DBUtil.getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM my_table WHERE username LIKE '%" + keyword + "%'");
while (rs.next()) {
String username = rs.getString("username");
%>
<p><%= username %></p>
<%
}
rs.close();
stmt.close();
conn.close();
%>
该代码从表单中获取关键字参数,并根据关键字在数据库中执行模糊查询。查询结果将作为列表显示在页面上。
希望以上信息能对你有所帮助,如果还有其他问题,请随时提问!
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-4-23 17:25:19
@FishC
E:\python project\first>pip install setuptools
ERROR: Exception:
Traceback (most recent call last):
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\base_command.py", line 160, in exc_logging_wrapper
status = run_func(*args)
^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\req_command.py", line 247, in wrapper
return func(self, options, args)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\commands\install.py", line 326, in run
session = self.get_default_session(options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\req_command.py", line 98, in get_default_session
self._session = self.enter_context(self._build_session(options))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\req_command.py", line 125, in _build_session
session = PipSession(
^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\network\session.py", line 343, in __init__
self.headers["User-Agent"] = user_agent()
^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\network\session.py", line 175, in user_agent
setuptools_dist = get_default_environment().get_distribution("setuptools")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 188, in get_distribution
return next(matches, None)
^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 183, in <genexpr>
matches = (
^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\base.py", line 612, in iter_all_distributions
for dist in self._iter_distributions():
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 176, in _iter_distributions
for dist in finder.find_eggs(location):
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 146, in find_eggs
yield from self._find_eggs_in_zip(location)
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 123, in _find_eggs_in_zip
from pip._vendor.pkg_resources import find_eggs_in_zip
File "E:\python project\first\venv\Lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2164, in <module>
register_finder(pkgutil.ImpImporter, find_on_path)
^^^^^^^^^^^^^^^^^^^
AttributeError: module 'pkgutil' has no attribute 'ImpImporter'. Did you mean: 'zipimporter'?
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "E:\python project\first\venv\Scripts\pip.exe\__main__.py", line 7, in <module>
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\main.py", line 70, in main
return command.main(cmd_args)
^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\base_command.py", line 101, in main
return self._main(args)
^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\base_command.py", line 216, in _main
self.handle_pip_version_check(options)
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\req_command.py", line 179, in handle_pip_version_check
session = self._build_session(
^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\req_command.py", line 125, in _build_session
session = PipSession(
^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\network\session.py", line 343, in __init__
self.headers["User-Agent"] = user_agent()
^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\network\session.py", line 175, in user_agent
setuptools_dist = get_default_environment().get_distribution("setuptools")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 188, in get_distribution
return next(matches, None)
^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 183, in <genexpr>
matches = (
^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\base.py", line 612, in iter_all_distributions
for dist in self._iter_distributions():
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 176, in _iter_distributions
for dist in finder.find_eggs(location):
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 146, in find_eggs
yield from self._find_eggs_in_zip(location)
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 123, in _find_eggs_in_zip
from pip._vendor.pkg_resources import find_eggs_in_zip
File "E:\python project\first\venv\Lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2164, in <module>
register_finder(pkgutil.ImpImporter, find_on_path)
^^^^^^^^^^^^^^^^^^^
AttributeError: module 'pkgutil' has no attribute 'ImpImporter'. Did you mean: 'zipimporter'?
检查上述错误原因
FishC
发表于 2024-4-23 17:25:30
zqy173590939 发表于 2024-04-23 17:25
@FishC
E:\python project\first>pip install setupt ...
这个错误是由于Python环境中的某些模块出现了问题所导致的。根据错误信息,有一个名为`pkgutil`的模块没有`ImpImporter`属性,而是应该是`zipimporter`。
解决这个问题的方法是更新`setuptools`模块。可以使用以下命令来更新:
pip install --upgrade setuptools
如果更新`setuptools`没有解决问题,可以尝试卸载并重新安装`setuptools`模块:
pip uninstall setuptools
pip install setuptools
希望这个解决方案能帮到你!如果还有其他问题,请随时提问。
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-4-23 17:26:35
FishC 发表于 2024-4-23 17:25
这个错误是由于Python环境中的某些模块出现了问题所导致的。根据错误信息,有一个名为`pkgutil`的模块 ...
E:\python project\first>pip uninstall setuptools
ERROR: Exception:
Traceback (most recent call last):
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\base_command.py", line 160, in exc_logging_wrapper
status = run_func(*args)
^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\commands\uninstall.py", line 61, in run
session = self.get_default_session(options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\req_command.py", line 98, in get_default_session
self._session = self.enter_context(self._build_session(options))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\cli\req_command.py", line 125, in _build_session
session = PipSession(
^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\network\session.py", line 343, in __init__
self.headers["User-Agent"] = user_agent()
^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\network\session.py", line 175, in user_agent
setuptools_dist = get_default_environment().get_distribution("setuptools")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 188, in get_distribution
return next(matches, None)
^^^^^^^^^^^^^^^^^^^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 183, in <genexpr>
matches = (
^
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\base.py", line 612, in iter_all_distributions
for dist in self._iter_distributions():
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 176, in _iter_distributions
for dist in finder.find_eggs(location):
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 146, in find_eggs
yield from self._find_eggs_in_zip(location)
File "E:\python project\first\venv\Lib\site-packages\pip\_internal\metadata\importlib\_envs.py", line 123, in _find_eggs_in_zip
from pip._vendor.pkg_resources import find_eggs_in_zip
File "E:\python project\first\venv\Lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2164, in <module>
register_finder(pkgutil.ImpImporter, find_on_path)
^^^^^^^^^^^^^^^^^^^
AttributeError: module 'pkgutil' has no attribute 'ImpImporter'. Did you mean: 'zipimporter'?
这又是什么意思?
FishC
发表于 2024-4-23 17:26:45
zqy173590939 发表于 2024-04-23 17:26
E:\python project\first>pip uninstall setuptools
...
这个错误是在尝试卸载`setuptools`模块时出现的。同样,它与Python环境中的某些模块存在问题有关。
建议尝试使用以下方法来解决问题:
1. 确保你使用的是最新版本的pip。可以通过运行`python -m pip install --upgrade pip`来更新pip。
2. 如果pip仍然无法正常工作,请尝试重新安装Python环境。
- 首先,删除现有的Python环境。
- 然后,重新安装Python,并确保在安装过程中勾选正确的选项(例如“Add Python to PATH”)。
3. 如果上述方法都没有解决问题,请考虑使用虚拟环境(virtualenv)来管理你的项目。首先创建一个新的虚拟环境,然后使用该环境进行开发。
希望以上方法能够帮助你解决问题!如果还有其他疑问,请随时提问。
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-5-7 16:13:04
@FishC
企业到金融商业机构贷款,金融商业机构需要对企业进行评估。例如,Moody公司就是New York的一家专门评估企业的贷款信誉的公司。设:
下面列出美国66家企业的具体情况:
Y X1 X2 X3
0 -62.8 -89.5 1.7
0 3.3 -3.5 1.1
0 -120.8 -103.2 2.5
0 -18.1 -28.8 1.1
0 -3.8 -50.6 0.9
0 -61.2 -56.2 1.7
0 -20.3 -17.4 1.0
0 -194.5 -25.8 0.5
0 20.8 -4.3 1.0
0 -106.1 -22.9 1.5
0 -39.4 -35.7 1.2
0 -164.1 -17.7 1.3
0 -308.9 -65.8 0.8
0 7.2 -22.6 2.0
0 -118.3 -34.2 1.5
0 -185.9 -280.0 6.7
0 -34.6 -19.4 3.4
0 -27.9 6.3 1.3
0 -48.2 6.8 1.6
0 -49.2 -17.2 0.3
0 -19.2 -36.7 0.8
0 -18.1 -6.5 0.9
0 -98.0 -20.8 1.7
0 -129.0 -14.2 1.3
0 -4.0 -15.8 2.1
0 -8.7 -36.3 2.8
0 -59.2 -12.8 2.1
0 -13.1 -17.6 0.9
0 -38.0 1.6 1.2
0 -57.9 0.7 0.8
0 -8.8 -9.1 0.9
0 -64.7 -4.0 0.1
0 -11.4 4.8 0.9
1 43.0 16.4 1.3
1 47.0 16.0 1.9
1 -3.3 4.0 2.7
1 35.0 20.8 1.9
1 46.7 12.6 0.9
1 20.8 12.5 2.4
1 33.0 23.6 1.5
1 26.1 10.4 2.1
1 68.6 13.8 1.6
1 37.3 33.4 3.5
1 59.0 23.1 5.5
1 49.6 23.8 1.9
1 12.5 7.0 1.8
1 37.3 34.1 1.5
1 35.3 4.2 0.9
1 49.5 25.1 2.6
1 18.1 13.5 4.0
1 31.4 15.7 1.9
1 21.5 -14.4 1.0
1 8.5 5.8 1.5
1 40.6 5.8 1.8
1 34.6 26.4 1.8
1 19.9 26.7 2.3
1 17.4 12.6 1.3
1 54.7 14.6 1.7
1 53.5 20.6 1.1
1 35.9 26.4 2.0
1 39.4 30.5 1.9
1 53.1 7.1 1.9
1 39.8 13.8 1.2
1 59.5 7.0 2.0
1 16.3 20.4 1.0
1 21.7 -7.8 1.6
其中,
X1=未分配利润,X2=文付利息后的利润,X3=销售额
y={ 0,企业2年后破产
1,企业2年后具备还款能力
建立破产特征变量 的回归方程。
这是python实验,给出程序
FishC
发表于 2024-5-7 16:13:47
zqy173590939 发表于 2024-05-07 16:13
@FishC
企业到金融商业机构贷款,金融商业机构需要 ...
首先,我们需要导入所需的库,包括pandas用于数据处理和分析,以及statsmodels库用于建立回归模型:
import pandas as pd
import statsmodels.api as sm
接下来,我们将给出数据并创建一个DataFrame对象:
data = {'Y': ,
'X1': [-62.8, 3.3, -120.8, -18.1, -3.8, -61.2, -20.3, -194.5, 20.8, -106.1, -39.4, -164.1, -308.9, 7.2, -118.3, -185.9, -34.6, -27.9, -48.2, -49.2, -19.2, -18.1, -98.0, -129.0, -4.0, -8.7, -59.2, -13.1, -38.0, -57.9, -8.8, -64.7, -11.4, 43.0, 47.0, -3.3, 35.0, 46.7, 20.8, 33.0, 26.1, 68.6, 37.3, 59.0, 49.6, 12.5, 37.3, 35.3, 49.5, 18.1, 31.4, 21.5, 8.5, 40.6, 34.6, 19.9, 17.4, 54.7, 53.5, 35.9, 39.4, 53.1, 39.8, 59.5, 16.3, 21.7],
'X2': [-89.5, -3.5, -103.2, -28.8, -50.6, -56.2, -17.4, -25.8, -4.3, -22.9, -35.7, -17.7, -65.8, -22.6, -34.2, -280.0, -19.4, 6.3, 6.8, -17.2, -36.7, -6.5, -20.8, -14.2, -15.8, -36.3, -12.8, -17.6, 1.6, 0.7, -9.1, -4.0, 4.8, 16.4, 16.0, 4.0, 20.8, 12.6, 12.5, 23.6, 10.4, 13.8, 33.4, 23.1, 23.8, 7.0, 34.1, 4.2, 25.1, 13.5, 15.7, -14.4, 5.8, 5.8, 26.4, 26.7, 12.6, 14.6, 20.6, 26.4, 30.5, 7.1, 13.8, 7.0, 20.4, -7.8],
'X3': }
df = pd.DataFrame(data)
接下来,我们需要进行回归分析。首先,我们定义自变量X和因变量y:
X = df[['X1', 'X2', 'X3']]
y = df['Y']
然后,我们向X添加常数列(截距项):
X = sm.add_constant(X)
接下来,我们使用最小二乘法来建立模型,并进行拟合:
model = sm.OLS(y, X).fit()
最后,我们可以打印模型的摘要及系数:
print(model.summary())
完整的代码如下:
```python
import pandas as pd
import statsmodels.api as sm
data = {'Y': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1
以上回复来自 FishC AI 小助理,如未能正确解答您的问题,请继续追问。
zqy173590939
发表于 2024-5-7 16:19:52
FishC 发表于 2024-5-7 16:13
首先,我们需要导入所需的库,包括pandas用于数据处理和分析,以及statsmodels库用于建立回归模型:
...
Traceback (most recent call last):
File "E:\python project\pythonProject\main.py", line 9, in <module>
df = pd.DataFrame(data)
^^^^^^^^^^^^^^^^^^
File "E:\python project\pythonProject\venv\Lib\site-packages\pandas\core\frame.py", line 778, in __init__
mgr = dict_to_mgr(data, index, columns, dtype=dtype, copy=copy, typ=manager)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\pythonProject\venv\Lib\site-packages\pandas\core\internals\construction.py", line 503, in dict_to_mgr
return arrays_to_mgr(arrays, columns, index, dtype=dtype, typ=typ, consolidate=copy)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\pythonProject\venv\Lib\site-packages\pandas\core\internals\construction.py", line 114, in arrays_to_mgr
index = _extract_index(arrays)
^^^^^^^^^^^^^^^^^^^^^^
File "E:\python project\pythonProject\venv\Lib\site-packages\pandas\core\internals\construction.py", line 677, in _extract_index
raise ValueError("All arrays must be of the same length")
ValueError: All arrays must be of the same length
出现以下错误,修改代码,给出完整代码
FishC
发表于 2024-5-7 16:20:24
zqy173590939 发表于 2024-05-07 16:19
Traceback (most recent call last):
File "E:\pyt ...
非常抱歉给出的代码有问题,导致出现了错误。以下是修正后的完整代码:
import pandas as pd
import statsmodels.api as sm
# 定义数据
data = {
'Y': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
'X1': [-62.8, 3.3, -120.8, -18.1, -3.8, -61.2, -20.3, -194.5, 20.8, -106.1, -39.4, -164.1, -308.9, 7.2, -118.3,
-185.9, -34.6, -27.9, -48.2, -49.2, -19.2, -18.1, -98.0, -129.0, -4.0, -8.7, -59.2, -13.1, -38.0, -57.9,
-8.8, -64.7, -11.4, 43.0, 47.0, -3.3, 35.0, 46.7, 20.8, 33.0, 26.1, 68.6, 37.3, 59.0, 49.6, 12.5, 37.3,
35.3, 49.5, 18.1, 31.4, 21.5, 8.5, 40.6, 34.6, 19.9, 17.4, 54.7, 53.5, 35.9, 39.4, 53.1, 39.8, 59.5, 16.3,
21.7],
'X2': [-89.5, -3.5, -103.2, -28.8, -50.6, -56.2, -17.4, -25.8, -4.3, -22.9, -35.7, -17.7, -65.8, -22.6, -34.2,
-280.0, -19.4, 6.3, 6.8, -17.2, -36.7, -6.5, -20.8, -14.2, -15.8, -36.3, -12.8, -17.6, 1.6, 0.7, -9.1, -4.0,
4.8, 16.4, 16.0, 4.0, 20.8, 12.6, 12.5, 23.6, 10.4, 13.8, 33.4, 23.1, 23.8, 7.0, 34.1, 4.2, 25.1, 13.5, 15.7,
-14.4, 5.8, 5.8, 26.4, 26.7, 12.6, 14.6, 20.6, 26.4, 30.5, 7.1, 13.8, 7.0, 20.4, -7.8],
'X3': [1.7, 1.1, 2.5, 1.1, 0.9, 1.7, 1.0, 0.5, 1.0, 1.5, 1.2, 1.3, 0.8, 2.0, 1.5, 6.7, 3.4, 1.3, 1.6, 0.3, 0.8, 0.9,
1.7, 1.3, 2.1, 2.8, 2.1, 0.9, 1.2, 0.8, 0.9, 0.1, 0.9, 1.3, 1.3, 1.9, 2.7, 1.9, 0.9, 2.4, 1.5, 2.1, 1.6, 3.5,
5.5, 1.9, 1.8, 1.5, 0.9, 2.6, 4.0, 1.9, 1.0, 1.5, 1.8, 2.3, 1.3, 1.7, 1.1, 2.0, 1.9, 1.9, 2.0, 1.2, 2.0, 1.0,
1.6]
}
# 将字典数据转换为DataFrame
df = pd.DataFrame(data)
# 添加常数列
df['intercept'] = 1
# 定义自变量和因变量
X = df[['intercept', 'X1', 'X2', 'X3']]
y = df['Y']
# 运行逻辑回归模型
model = sm.Logit(y, X)
result = model.fit()
# 打印回归结果
print(result.summary())
注意,上述代码使用了`statsmodels`库中的`Logit`函数来建立逻辑回归模型。通过查看回归结果的摘要信息,您可以了解各个自变量对因变量的影响程度。
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