專案使用mysql資料庫，有2張表格。一張使用者表用於登入驗證，一張學生表，用於增刪改查。
creat table t_user( id int primary key auto_increment, login_name varchar(255), login_pwd varchar(255), real_name varchar(255), ); insert into t_user(id,login_name,login_pwd,real_name) values('akm'，"123",'萝卜蹲')； CREATE TABLE t_user( id char(12) PRIMARY KEY, name char(6), pwd varchar(255), );
#1.1登入介面
密碼列輸入：123
點選登入按鈕，就可以直接進入系統。
1.2系統主介面
1.3查詢資訊
#透過id查詢學生資料。
1.4遍歷資訊
1.5 刪除資訊
package com.company;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;
import java.sql.Statement;
import java.util.Scanner;
public class Test {
static Connection conn ;
static Statement statement;
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
login();
}
public static void control() {
JFrame jf = new JFrame("学生学籍管理系统");
jf.setLayout(new FlowLayout(FlowLayout.LEFT));
jf.setBounds(400, 300, 300, 200);
JButton button = new JButton("更新");
JButton button1=new JButton("遍历");
JButton button2=new JButton("删除");
JButton button3=new JButton("添加");
JButton button4=new JButton("查询");
jf.add(button);
jf.add(button1);
jf.add(button2);
jf.add(button3);
jf.add(button4);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
update();
}
});
button1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
query();
}
});
button2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
delete();
}
});
button3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
insert();
}
});
button4.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {onequery();}
});
jf.setVisible(true);
jf.setResizable(false);
button.setSize(40, 20);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void update() {
conn = getConnection();
JFrame jf = new JFrame("学生学籍管理系统");
jf.setLayout(new FlowLayout(FlowLayout.LEFT));
jf.setBounds(400, 300, 300, 200);
JLabel label1 = new JLabel("年龄");
JTextField agetext = new JTextField("", 10);
JLabel label2 = new JLabel("id");
JTextField idtext = new JTextField("", 10);
JLabel label3 = new JLabel("学籍");
JTextField addresstext = new JTextField("", 10);
JLabel label4 = new JLabel("姓名");
JTextField nametext = new JTextField("", 5);
JTextField out = new JTextField("更新状态", 20);
JButton button = new JButton("更新");
jf.add(label1);
jf.add(agetext);
jf.add(label2);
jf.add(idtext);
jf.add(label3);
jf.add(addresstext);
jf.add(label4);
jf.add(nametext);
jf.add(out);
jf.add(button);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
PreparedStatement ps=null;
String age = agetext.getText();
String id = idtext.getText();
String address= addresstext.getText();
String name=nametext.getText();
try {
// 更新数据的sql语句
String sql = "update student set age =? , address =?, name=? where id = ?";
ps=conn.prepareStatement(sql);
ps.setString(1,agetext.getText());
ps.setString(2,addresstext.getText());
ps.setString(3,nametext.getText());
ps.setString(4,idtext.getText());
int count = ps.executeUpdate();//记录操作次数
// 输出插入操作的处理结果
System.out.println("user表中更新 " + count + " 条数据");
ps.close();
//关闭数据库连接
conn.close();
out.setText("更新成功！！！！！！！！");
// 创建用于执行静态sql语句的Statement对象，st属局部变量
} catch (SQLException a) {
System.out.println("更新数据失败");
}
}
});
jf.setVisible(true);
jf.setResizable(false);
button.setSize(40, 20);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void query() {
PreparedStatement ps=null;
conn = getConnection();
JFrame jf = new JFrame("学生学籍管理系统");
jf.setLayout(null);
jf.setBounds(400, 300, 350, 200);
JButton button = new JButton("查询");
JTextArea jm=new JTextArea("ID\t姓名\t年龄\t学籍");//显示界面
jm.setBounds(10,50,350,100);//定义显示界面位置
jf.add(button);
jf.add(jm);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
PreparedStatement ps=null;
try {
String sql = "select * from Student";
//创建用于执行静态sql语句的Statement对象，statement属局部变量
statement = conn.createStatement();//获取操作对象
ResultSet resultSet = statement.executeQuery(sql);// executeQuery执行单个SQL语句，返回单个ResultSet对象是
while (resultSet.next())//循环没有数据的时候返回flase退出循环
{
Integer Id = resultSet.getInt("id");//resultSet.next()是一个光标
String name = resultSet.getString("name");//getString返回的值一定是string
Integer age = resultSet.getInt("age");
String address=resultSet.getString("address");
//String adress = resultSet.getString("adress");
//输出查到的记录的各个字段的值
jm.append("\n"+Id + "\t" + name + "\t" + age+ "\t" + address );
}
statement.close();
conn.close();
}catch (SQLException b){
System.out.println("查询失败！！！！！！！！");
}
}
});
jf.setVisible(true);
jf.setResizable(false);
button.setSize(40, 20);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void delete() {
conn = getConnection();
JFrame jf = new JFrame("学生学籍管理系统");
jf.setLayout(new FlowLayout(FlowLayout.LEFT));
jf.setBounds(400, 300, 300, 200);
JLabel label2 = new JLabel("id");
JTextField idtext = new JTextField("", 10);
JTextField out = new JTextField("删除状态", 20);
JButton button = new JButton("删除");
jf.add(label2);
jf.add(idtext);
jf.add(out);
jf.add(button);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String id = idtext.getText();
PreparedStatement ps=null;
try {
// 删除数据的sql语句
String sql = "delete from Student where id = ?";
ps=conn.prepareStatement(sql);
ps.setString(1,idtext.getText());
int count = ps.executeUpdate();//记录操作次数
// 输出插入操作的处理结果
System.out.println("student表中删除 " + count + " 条数据");
ps.close();
out.setText("删除成功！！！！！！！！");
// 关闭数据库连接
conn.close();
} catch (SQLException c) {
System.out.println("删除数据失败");
}
}
});
jf.setVisible(true);
jf.setResizable(false);
button.setSize(40, 20);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void insert() {
// 首先要获取连接，即连接到数据库
conn = getConnection();
JFrame jf = new JFrame("学生学籍管理系统");
jf.setLayout(new FlowLayout(FlowLayout.LEFT));
jf.setBounds(400, 300, 300, 200);
JLabel label3 = new JLabel("id");
JTextField idtext = new JTextField("", 10);
JLabel label1 = new JLabel("年龄");
JTextField agetext = new JTextField("", 10);
JLabel label2 = new JLabel("姓名");
JTextField nametext = new JTextField("", 10);
JLabel label4 = new JLabel("学籍");
JTextField addresstext = new JTextField("", 5);
JTextField out = new JTextField("添加状态", 20);
JButton button = new JButton("添加");
jf.add(label3);
jf.add(idtext);
jf.add(label1);
jf.add(agetext);
jf.add(label2);
jf.add(nametext);
jf.add(label4);
jf.add(addresstext);
jf.add(out);
jf.add(button);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String age = agetext.getText();
String name = nametext.getText();
String id=idtext.getText();
String address=addresstext.getText();
try {
PreparedStatement ps=null;
// 插入数据的sql语句
String sql = "INSERT INTO Student( id,age,name,address) VALUES ( ?,?,?,?)";
ps=conn.prepareStatement(sql);
ps.setString(1,idtext.getText());
ps.setString(2,agetext.getText());
ps.setString(3,nametext.getText());
ps.setString(4,addresstext.getText());
int count = ps.executeUpdate();//记录操作次数
// 输出插入操作的处理结果
System.out.println("向user表中插入 " + count + " 条数据");
ps.close();
out.setText("添加成功！！！！！！！！");
// 关闭数据库连接
conn.close();
} catch (SQLException d) {
System.out.println("插入数据失败" + d.getMessage());
}
}
});
jf.setVisible(true);
jf.setResizable(false);
button.setSize(40, 20);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static boolean login(){
conn = getConnection();
JFrame jf = new JFrame("学生学籍管理系统");
jf.setLayout(new FlowLayout(FlowLayout.LEFT));
jf.setBounds(400, 300, 300, 200);
JLabel label1 = new JLabel("用户名");
JTextField usernametext = new JTextField("", 20);
JLabel label2 = new JLabel("密码");
JPasswordField pwdtext = new JPasswordField("", 20);
JTextField out = new JTextField("登录状态", 20);
JButton button = new JButton("登录");
jf.add(label1);
jf.add(usernametext);
jf.add(label2);
jf.add(pwdtext);
jf.add(out);
jf.add(button);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// 插入数据的sql语句
PreparedStatement ps=null;
try {
statement = conn.createStatement();//获取操作对象
String x = usernametext.getText();
String y = pwdtext.getText();
String sql ="select * from user";
ResultSet resultSet = statement.executeQuery(sql);
while(resultSet.next()){
String a=resultSet.getString("login_name");
String b=resultSet.getString("login_pwd");
if(a.equals(x)&&b.equals(y))
{
control();
out.setText("!!!!!登录成功!!!!!");
}
else if(x!=a&&y!=b){
out.setText("登录失败，请重新输入");
}
}
usernametext.setText("");
pwdtext.setText("");
} catch (SQLException throwables) {
throwables.printStackTrace();
}
}
});
jf.setVisible(true);
jf.setResizable(false);
button.setSize(40, 20);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
boolean ok = true;
return ok;
}
public static void onequery() {
PreparedStatement ps=null;
conn = getConnection();
JFrame jf = new JFrame("学生学籍管理系统");
jf.setLayout(new FlowLayout(FlowLayout.LEFT));
jf.setBounds(400, 300, 350, 200);
JLabel label3 = new JLabel("id");
JTextField idtext = new JTextField("", 10);
JLabel label1 = new JLabel("条件");
JTextField atext = new JTextField("", 10);
JButton button = new JButton("查询");
//JTextArea jm=new JTextArea("ID\t姓名\t年龄\t学籍");//显示界面
//jm.setBounds(10,50,350,100);//定义显示界面位置
jf.add(label3);
jf.add(idtext);
jf.add(button);
//jf.add(jm);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
PreparedStatement ps=null;
String id=idtext.getText();
conn = getConnection();
try {
String sql = "select * from student where id = ?";
//创建用于执行静态sql语句的Statement对象，statement属局部变量
ps=conn.prepareStatement(sql);//获取操作对象
ps.setString(1,idtext.getText().toString());
ResultSet resultSet = ps.executeQuery();// executeQuery执行单个SQL语句，返回单个ResultSet对象是
while (resultSet.next())//循环没有数据的时候返回flase退出循环
{
Integer Id = resultSet.getInt("id");//resultSet.next()是一个光标
String name = resultSet.getString("name");//getString返回的值一定是string
Integer age = resultSet.getInt("age");
String address=resultSet.getString("address");
System.out.println(Id + " " + name + " " + age + " "+ address + " " );
//输出查到的记录的各个字段的值
//jm.append("\n"+Id + "\t" + name + "\t" + age+ "\t" + address );
}
statement.close();
conn.close();
}catch (SQLException m){
System.out.println(m.getMessage());
System.out.println("查询失败！！！！！！！！");
}
}
});
jf.setVisible(true);
jf.setResizable(false);
button.setSize(40, 20);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static Connection getConnection(){
//创建用于连接数据库的Connection对象
Connection connection = null;
try {
// 加载Mysql数据驱动
Class.forName("com.mysql.cj.jdbc.Driver");
System.out.println("数据库驱动加载成功");
String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai";
// 创建数据连接
connection = DriverManager.getConnection(url, "root", "root");
System.out.println("数据库连接成功");
}catch (ClassNotFoundException | SQLException e){
System.out.println("数据库连接失败" + e.getMessage());//处理查询结果
}
return connection;
}
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