Java 项目 学生信息管理系统 超详细 超完整 保姆级讲解（主页面 + 添加学生信息 + 删除学生信息 +…

Java 学生信息管理系统

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1. 项目概述

这是一个学生信息管理系统，学生信息主要包括：学号，姓名，性别，出生日期，班级；暂时就只有这些信息，若后续需要，可以相应的进行添加。

该项目主要采用的技术是 Java GUI 设计，这个地方主要用 Java 工具 windowsbuilder 进行布局，（windowsbuilder没有安装或者不会安装的，可以看看我的这篇博客 Eclipse 安装 windowbuilder插件 ），MySql 数据库（MySql 数据库没有安装的 或者数据库使用软件 Navicat 没有安装的可以看看我的这篇博客 2021 MySql 8.0.26 安装教程（最详细的傻瓜教程） ），以及使用 Java 中的 JDBC 将数据库链接起来。

2. 数据库的建立

由于在项目中没有创建学生数据库的功能，所以学生数据库必须要先建立好，下面给出如何建立好MySQL学生数据库的相关代码 + 图片

-- 创建数据库CREATE DATABASE niitDEFAULT CHARACTER SET utf8mb4;SHOW DATABASES;-- 使用数据库niitUSE niit;-- 创建表StudentCREATE TABLE Student(ID INT PRIMARY KEY, NAME VARCHAR(4),GENDER CHAR(1),DOB DATE,BATCH INT);-- 插入记录INSERT INTO Student VALUES(1,'独孤求败','男','1988-1-2',1),(2,'周芷若','女','1988-12-3',1),(3,'金毛狮王','男','1978-11-1',1),(4,'蒙挚','男','1989-2-5',2),(5,'夏春','女','1998-4-3',2),(6,'梅长苏','男','1999-12-6',2);-- 查看表中所有记录 语法：select * from 表名SELECT * FROM Student;

3. 项目页面

主页面

添加学生

修改信息

删除学生

查询信息

4. 项目代码 + 分析

主页面

package studentsmanager;import java.awt.Color;import java.awt.EventQueue;import java.awt.Font;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;public class MainFrame extends JFrame { private JPanel contentPane;/** * Launch the application. */// 有了main函数才可以单独运行public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { MainFrame frame = new MainFrame();frame.setVisible(true);} catch (Exception e) { e.printStackTrace();}}});}/** * Create the frame. */public MainFrame() { // 设置大小不可改变setResizable(false);// 设置标题setTitle("学生管理系统");// 由于这是主页面，所有当主页面关闭的时候，程序就直接退出setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// setBounds(int x,int y,int width,int height);// x 和 y 是窗口打开时的位置// width 和 height 是窗口打宽度和高度setBounds(100, 100, 450, 350);// setLocationRelativeTo(c)// 设置窗口相对于 c 的位置，当 c 为空或者 null 时，默认为是相对于屏幕中央setLocationRelativeTo(null);// 实例化一个 panecontentPane = new JPanel();contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));setContentPane(contentPane);contentPane.setLayout(null);JLabel lblNewLabel = new JLabel("学生管理系统");lblNewLabel.setForeground(Color.RED);lblNewLabel.setFont(new Font("宋体", Font.BOLD, 25));lblNewLabel.setBounds(140, 10, 163, 44);contentPane.add(lblNewLabel);JButton addButton = new JButton("添加学生");// addActionListener 注册监听器addButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 设置新窗口可见new AddFrame().setVisible(true);}});addButton.setFont(new Font("宋体", Font.PLAIN, 18));addButton.setBounds(167, 64, 114, 37);contentPane.add(addButton);JButton changeButton = new JButton("修改信息");changeButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 同上new ChangeFrame().setVisible(true);}});changeButton.setFont(new Font("宋体", Font.PLAIN, 18));changeButton.setBounds(167, 121, 114, 37);contentPane.add(changeButton);JButton deleteButton = new JButton("删除学生");deleteButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 同上new DeleteFrame().setVisible(true);}});deleteButton.setFont(new Font("宋体", Font.PLAIN, 18));deleteButton.setBounds(167, 180, 114, 37);contentPane.add(deleteButton);JButton queryButton = new JButton("查询信息");queryButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 同上new QueryFrame().setVisible(true);}});queryButton.setFont(new Font("宋体", Font.PLAIN, 18));queryButton.setBounds(167, 240, 114, 37);contentPane.add(queryButton);}}

添加学生

package studentsmanager;import java.awt.EventQueue;import java.awt.Font;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.sql.SQLException;import javax.swing.BoxLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.border.EmptyBorder;public class AddFrame extends JFrame { private JPanel contentPane;private JTextField idField;private JTextField nameField;private JTextField genderField;private JTextField dobField;private JTextField batchField;/** * Launch the application. */public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { AddFrame frame = new AddFrame();frame.setVisible(true);} catch (Exception e) { e.printStackTrace();}}});}/** * Create the frame. */public AddFrame() { // 和前面类似setResizable(false);setTitle("添加学生");// 这个地方，添加学生只是这个程序的一部分，所以当关闭这部分的时候，程序不直接退出，只是关闭该部分程序setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);setBounds(100, 100, 450, 470);setLocationRelativeTo(null);contentPane = new JPanel();contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));setContentPane(contentPane);contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));JPanel panel = new JPanel();contentPane.add(panel);panel.setLayout(null);JLabel TitleLabel = new JLabel("请输入新学生的信息：");TitleLabel.setFont(new Font("宋体", Font.BOLD, 20));TitleLabel.setBounds(71, 34, 208, 45);panel.add(TitleLabel);JLabel idLabel = new JLabel("学号：");idLabel.setFont(new Font("宋体", Font.PLAIN, 16));idLabel.setBounds(71, 105, 50, 30);panel.add(idLabel);idField = new JTextField();idField.setBounds(143, 99, 240, 45);panel.add(idField);idField.setColumns(10);JLabel nameLabel = new JLabel("姓名：");nameLabel.setFont(new Font("宋体", Font.PLAIN, 16));nameLabel.setBounds(71, 160, 50, 30);panel.add(nameLabel);nameField = new JTextField();nameField.setColumns(10);nameField.setBounds(143, 154, 240, 45);panel.add(nameField);JLabel genderLabel = new JLabel("性别：");genderLabel.setFont(new Font("宋体", Font.PLAIN, 16));genderLabel.setBounds(71, 215, 50, 30);panel.add(genderLabel);genderField = new JTextField();genderField.setColumns(10);genderField.setBounds(143, 209, 240, 45);panel.add(genderField);JLabel dobLabel = new JLabel("出生日期：");dobLabel.setFont(new Font("宋体", Font.PLAIN, 16));dobLabel.setBounds(41, 270, 80, 30);panel.add(dobLabel);dobField = new JTextField();dobField.setColumns(10);dobField.setBounds(143, 264, 240, 45);panel.add(dobField);JLabel batchLabel = new JLabel("班级：");batchLabel.setFont(new Font("宋体", Font.PLAIN, 16));batchLabel.setBounds(71, 325, 50, 30);panel.add(batchLabel);batchField = new JTextField();batchField.setColumns(10);batchField.setBounds(143, 319, 240, 45);panel.add(batchField);JButton addButton = new JButton("添加");// 添加鼠标监听事件addButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 先取出数据// getText() 返回字符串类型的// Integer.parseInt 数据类型转换int id = Integer.parseInt(idField.getText());String nameString = nameField.getText();String genderString = genderField.getText();String dobfieldString = dobField.getText();int batch = Integer.parseInt(batchField.getText());// 输出一下学生的信息，方便修改System.out.println(id + "\t" + nameString + "\t" + genderString + "\t" + dobfieldString + "\t" + batch);// SQLHelp 是自己写的一个工具类SQLHelp sqlHelp = new SQLHelp();try { // 调用添加学生信息的方法sqlHelp.addStudent(id, nameString, genderString, dobfieldString, batch);// 弹出对话框，提示用户添加成功JOptionPane.showMessageDialog(AddFrame.this, "添加成功！");} catch (SQLException e1) { // 这里捕获一下异常，因为学生的学号是唯一的，所以当学号已经存在的时候，提示用户，该学生信息已存在// 异常代码为 23000if(e1.getSQLState().equals("23000")) { JOptionPane.showMessageDialog(AddFrame.this, "添加失败!该学生已存在");}e1.printStackTrace();}}});addButton.setFont(new Font("宋体", Font.PLAIN, 18));addButton.setBounds(182, 389, 97, 33);panel.add(addButton);}}

添加成功：

添加失败：

修改信息

package studentsmanager;import java.awt.EventQueue;import java.awt.Font;import javax.swing.BoxLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.border.EmptyBorder;import java.awt.event.ActionListener;import java.sql.SQLException;import java.awt.event.ActionEvent;public class ChangeFrame extends JFrame { private JPanel contentPane;private JTextField idField;private JTextField nameField;private JTextField genderField;private JTextField dobField;private JTextField batchField;private JTextField searchField;/** * Launch the application. */public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { ChangeFrame frame = new ChangeFrame();frame.setVisible(true);} catch (Exception e) { e.printStackTrace();}}});}/** * Create the frame. */public ChangeFrame() { setResizable(false);setTitle("修改信息");setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);setBounds(100, 100, 450, 470);setLocationRelativeTo(null);contentPane = new JPanel();contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));setContentPane(contentPane);contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));JPanel panel = new JPanel();contentPane.add(panel);panel.setLayout(null);JLabel lblNewLabel = new JLabel("请输入要修改的学生的学号：");lblNewLabel.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel.setBounds(71, 0, 208, 29);panel.add(lblNewLabel);JLabel lblNewLabel_1 = new JLabel("学号：");lblNewLabel_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1.setBounds(71, 105, 50, 30);panel.add(lblNewLabel_1);idField = new JTextField();idField.setEditable(false);idField.setBounds(143, 99, 240, 45);panel.add(idField);idField.setColumns(10);JLabel lblNewLabel_1_1 = new JLabel("姓名：");lblNewLabel_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1.setBounds(71, 160, 50, 30);panel.add(lblNewLabel_1_1);nameField = new JTextField();nameField.setColumns(10);nameField.setBounds(143, 154, 240, 45);panel.add(nameField);JLabel lblNewLabel_1_1_1 = new JLabel("性别：");lblNewLabel_1_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1.setBounds(71, 215, 50, 30);panel.add(lblNewLabel_1_1_1);genderField = new JTextField();genderField.setColumns(10);genderField.setBounds(143, 209, 240, 45);panel.add(genderField);JLabel lblNewLabel_1_1_1_1 = new JLabel("出生日期：");lblNewLabel_1_1_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1_1.setBounds(41, 270, 80, 30);panel.add(lblNewLabel_1_1_1_1);dobField = new JTextField();dobField.setColumns(10);dobField.setBounds(143, 264, 240, 45);panel.add(dobField);JLabel lblNewLabel_1_1_1_2 = new JLabel("班级：");lblNewLabel_1_1_1_2.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1_2.setBounds(71, 325, 50, 30);panel.add(lblNewLabel_1_1_1_2);batchField = new JTextField();batchField.setColumns(10);batchField.setBounds(143, 319, 240, 45);panel.add(batchField);JButton changeButton = new JButton("修改");changeButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { int id = Integer.parseInt(searchField.getText());String nameString = nameField.getText();String gendeString = genderField.getText();String dobString = dobField.getText();int batch = Integer.parseInt(batchField.getText());SQLHelp sqlHelp = new SQLHelp();try { sqlHelp.changeStudent(id, nameString, gendeString, dobString, batch);JOptionPane.showMessageDialog(ChangeFrame.this, "修改成功！");} catch (SQLException e) { JOptionPane.showMessageDialog(ChangeFrame.this, "修改失败！");e.printStackTrace();}}});changeButton.setFont(new Font("宋体", Font.PLAIN, 18));changeButton.setBounds(182, 389, 97, 33);panel.add(changeButton);searchField = new JTextField();searchField.setBounds(71, 39, 208, 45);panel.add(searchField);searchField.setColumns(10);JButton searchButton = new JButton("查找");searchButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e){ int id = Integer.parseInt(searchField.getText());try { SQLHelp sqlHelp = new SQLHelp();Student student = sqlHelp.queryStudent(id);if(student != null) { // id 是直接读入的，所以就不需要从数据库中读出了idField.setText(String.valueOf(id));nameField.setText(student.getName());genderField.setText(student.getGender());dobField.setText(student.getDob());batchField.setText(String.valueOf(student.getBatch()));} else { JOptionPane.showMessageDialog(ChangeFrame.this, "无此用户");}} catch (SQLException e1) { e1.printStackTrace();}}});searchButton.setFont(new Font("宋体", Font.PLAIN, 18));searchButton.setBounds(289, 42, 97, 39);panel.add(searchButton);}}

修改前查询到学生信息

修改成功

修改失败

失败的情况是数据链接出现了问题

未查询到学生信息

删除学生

package studentsmanager;import java.awt.EventQueue;import java.awt.Font;import javax.swing.BoxLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.border.EmptyBorder;import java.awt.event.ActionListener;import java.sql.SQLException;import java.awt.event.ActionEvent;public class DeleteFrame extends JFrame { private JPanel contentPane;private JTextField idField;private JTextField nameField;private JTextField genderField;private JTextField dobField;private JTextField batchField;private JTextField searchField;/** * Launch the application. */public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { DeleteFrame frame = new DeleteFrame();frame.setVisible(true);} catch (Exception e) { e.printStackTrace();}}});}/** * Create the frame. */public DeleteFrame() { setResizable(false);setTitle("删除学生");setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);setBounds(100, 100, 450, 470);setLocationRelativeTo(null);contentPane = new JPanel();contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));setContentPane(contentPane);contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));JPanel panel = new JPanel();contentPane.add(panel);panel.setLayout(null);JLabel lblNewLabel = new JLabel("请输入要删除的学生的学号：");lblNewLabel.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel.setBounds(71, 0, 208, 29);panel.add(lblNewLabel);JLabel lblNewLabel_1 = new JLabel("学号：");lblNewLabel_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1.setBounds(71, 105, 50, 30);panel.add(lblNewLabel_1);idField = new JTextField();idField.setEditable(false);idField.setBounds(143, 99, 240, 45);panel.add(idField);idField.setColumns(10);JLabel lblNewLabel_1_1 = new JLabel("姓名：");lblNewLabel_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1.setBounds(71, 160, 50, 30);panel.add(lblNewLabel_1_1);nameField = new JTextField();nameField.setColumns(10);nameField.setBounds(143, 154, 240, 45);panel.add(nameField);JLabel lblNewLabel_1_1_1 = new JLabel("性别：");lblNewLabel_1_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1.setBounds(71, 215, 50, 30);panel.add(lblNewLabel_1_1_1);genderField = new JTextField();genderField.setColumns(10);genderField.setBounds(143, 209, 240, 45);panel.add(genderField);JLabel lblNewLabel_1_1_1_1 = new JLabel("出生日期：");lblNewLabel_1_1_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1_1.setBounds(41, 270, 80, 30);panel.add(lblNewLabel_1_1_1_1);dobField = new JTextField();dobField.setColumns(10);dobField.setBounds(143, 264, 240, 45);panel.add(dobField);JLabel lblNewLabel_1_1_1_2 = new JLabel("班级：");lblNewLabel_1_1_1_2.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1_2.setBounds(71, 325, 50, 30);panel.add(lblNewLabel_1_1_1_2);batchField = new JTextField();batchField.setColumns(10);batchField.setBounds(143, 319, 240, 45);panel.add(batchField);JButton deleteButton = new JButton("删除");deleteButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int id = Integer.parseInt(searchField.getText());try { SQLHelp sqlHelp = new SQLHelp();sqlHelp.deletestudent(id);JOptionPane.showMessageDialog(DeleteFrame.this, "删除成功！");} catch (SQLException e1) { JOptionPane.showMessageDialog(DeleteFrame.this, "删除失败");e1.printStackTrace();}}});deleteButton.setFont(new Font("宋体", Font.PLAIN, 18));deleteButton.setBounds(182, 389, 97, 33);panel.add(deleteButton);searchField = new JTextField();searchField.setBounds(71, 39, 208, 45);panel.add(searchField);searchField.setColumns(10);JButton searchButton = new JButton("查找");searchButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { int id = Integer.parseInt(searchField.getText());try { SQLHelp sqlHelp = new SQLHelp();Student student = sqlHelp.queryStudent(id);if(student != null) { idField.setText(String.valueOf(id));nameField.setText(student.getName());genderField.setText(student.getGender());dobField.setText(student.getDob());batchField.setText(String.valueOf(student.getBatch()));} else { JOptionPane.showMessageDialog(DeleteFrame.this, "无此学生");}} catch (SQLException e) { e.printStackTrace();}}});searchButton.setFont(new Font("宋体", Font.PLAIN, 18));searchButton.setBounds(289, 42, 97, 39);panel.add(searchButton);}}

删除成功

删除失败

删除失败的时候是数据库链接出现了问题

查询到学生信息

未查询到学生

查询信息

package studentsmanager;import java.awt.EventQueue;import java.awt.Font;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.sql.SQLException;import javax.swing.BoxLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.border.EmptyBorder;public class QueryFrame extends JFrame { private JPanel contentPane;private JTextField idField;private JTextField nameField;private JTextField genderField;private JTextField dobField;private JTextField batchField;private JTextField searchField;/** * Launch the application. */public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { QueryFrame frame = new QueryFrame();frame.setVisible(true);} catch (Exception e) { e.printStackTrace();}}});}/** * Create the frame. */public QueryFrame() { setResizable(false);setTitle("查询信息");setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);setBounds(100, 100, 450, 470);setLocationRelativeTo(null);contentPane = new JPanel();contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));setContentPane(contentPane);contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));JPanel panel = new JPanel();contentPane.add(panel);panel.setLayout(null);JLabel lblNewLabel = new JLabel("请输入要查找的学生的学号：");lblNewLabel.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel.setBounds(71, 0, 208, 29);panel.add(lblNewLabel);JLabel lblNewLabel_1 = new JLabel("学号：");lblNewLabel_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1.setBounds(71, 105, 50, 30);panel.add(lblNewLabel_1);idField = new JTextField();idField.setEditable(false);idField.setBounds(143, 99, 240, 45);panel.add(idField);idField.setColumns(10);JLabel lblNewLabel_1_1 = new JLabel("姓名：");lblNewLabel_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1.setBounds(71, 160, 50, 30);panel.add(lblNewLabel_1_1);nameField = new JTextField();nameField.setColumns(10);nameField.setBounds(143, 154, 240, 45);panel.add(nameField);JLabel lblNewLabel_1_1_1 = new JLabel("性别：");lblNewLabel_1_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1.setBounds(71, 215, 50, 30);panel.add(lblNewLabel_1_1_1);genderField = new JTextField();genderField.setColumns(10);genderField.setBounds(143, 209, 240, 45);panel.add(genderField);JLabel lblNewLabel_1_1_1_1 = new JLabel("出生日期：");lblNewLabel_1_1_1_1.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1_1.setBounds(41, 270, 80, 30);panel.add(lblNewLabel_1_1_1_1);dobField = new JTextField();dobField.setColumns(10);dobField.setBounds(143, 264, 240, 45);panel.add(dobField);JLabel lblNewLabel_1_1_1_2 = new JLabel("班级：");lblNewLabel_1_1_1_2.setFont(new Font("宋体", Font.PLAIN, 16));lblNewLabel_1_1_1_2.setBounds(71, 325, 50, 30);panel.add(lblNewLabel_1_1_1_2);batchField = new JTextField();batchField.setColumns(10);batchField.setBounds(143, 319, 240, 45);panel.add(batchField);searchField = new JTextField();searchField.setBounds(71, 39, 208, 45);panel.add(searchField);searchField.setColumns(10);JButton searchButton = new JButton("查找");searchButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { // 1.读出要查询的学生输入的id// 因为学生的学号是唯一的，所以我们根据学号查询后，只会有一条数据// 转化一下数据类型int id = Integer.parseInt(searchField.getText());// 2.执行JDBC语句try { SQLHelp sqlHelp = new SQLHelp();Student student = sqlHelp.queryStudent(id);// 3.将查询结果填到文本框中// 前提是学生存在if(student != null) { idField.setText(String.valueOf(id));nameField.setText(student.getName());genderField.setText(student.getGender());dobField.setText(student.getDob());batchField.setText(String.valueOf(student.getBatch()));} else { // 此时学生不存在，提示用户，不存在该学生JOptionPane.showMessageDialog(QueryFrame.this, "无此学生");}} catch (SQLException e) { e.printStackTrace();}}});searchButton.setFont(new Font("宋体", Font.PLAIN, 18));searchButton.setBounds(289, 42, 97, 39);panel.add(searchButton);}}

SQLHelp 工具类

package studentsmanager;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;publicclass SQLHelp { public static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";public static final String DB_URL = "jdbc:mysql://localhost:3306/niit" /> 
Student 工具类
 
package studentsmanager;public class Student { private String name;private String gender;private String dob;private int batch;public Student(String name, String gender, String dob, int batch) { this.name = name;this.gender = gender;this.dob = dob;this.batch = batch;}public String getName() { return name;}public String getGender() { return gender;}public String getDob() { return dob;}public int getBatch() { return batch;}}
5. 项目总结
这算一个比较完整的项目了，既有 GUI 又有 MySQL 数据库的已经 Java 的 JDBC ，虽然已经有了 GUI 界面，但很明显，没有进行任何美化，就只是简单的一个界面，勉勉强强可以看的过去，使用 JDBC 链接数据库的时候，没有实现可以直接在程序创建数据库，只能从数据库方创建数据库，这是一个缺点，同时使用 JDBC 链接数据库的时候，所使用的代码依旧是 MySQL 数据库的代码，（我 MySQL 学的不好，增删改查啥的数据库代码都还记不清楚 哭了…）还有就是当程序在进行修改和删除的时候，修改失败和删除失败的时候，都是因为数据链接失败了才进行弹窗，不知道怎么改成无法修改或者无法删除的时候提示，（又哭了…）
欢迎个位大佬指出错误，同时也欢迎各位小白借鉴，有问题的话，评论或者私聊都是可以的，看了就会回复！