java gui 连接mysql数据库

 

 

package com.wt010.db;import java.sql.*;import javax.swing.JFrame;
import javax.swing.JTextArea;public class MySQLUtil extends JFrame {// JDBC 驱动名及数据库 URLstatic final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  static final String DB_URL = "jdbc:mysql://localhost:3306/w_w84_xinxy";// 数据库的用户名与密码，需要根据自己的设置static final String USER = "root";static final String PASS = "kwlloveh";private JTextArea ta;public MySQLUtil() {// TODO Auto-generated constructor stub
       fm();connect();}public void fm() {this.setTitle("MySQL");this.setSize(300, 300);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setLocationRelativeTo(null);ta=new JTextArea(30,50);this.add(ta);}public void connect() {Connection conn = null;Statement stmt = null;try{// 注册 JDBC 驱动Class.forName("com.mysql.jdbc.Driver");// 打开链接ta.append("连接数据库...\r\n");conn = DriverManager.getConnection(DB_URL,USER,PASS);// 执行查询ta.append(" 实例化Statement对...\r\n");stmt = conn.createStatement();String sql;sql = "SELECT * FROM admin_tb";ResultSet rs = stmt.executeQuery(sql);// 展开结果集数据库while(rs.next()){// 通过字段检索int id  = rs.getInt("id");String name = rs.getString("adminname");// 输出数据ta.append("ID: " + id+"\r\n");ta.append(", 管理员: " + name+"\r\n"); }// 完成后关闭
           rs.close();stmt.close();conn.close();}catch(SQLException se){// 处理 JDBC 错误
           se.printStackTrace();}catch(Exception e){// 处理 Class.forName 错误
           e.printStackTrace();}finally{// 关闭资源try{if(stmt!=null) stmt.close();}catch(SQLException se2){}// 什么都不做try{if(conn!=null) conn.close();}catch(SQLException se){se.printStackTrace();}}System.out.println("Goodbye!");}public static void main(String[] args) {MySQLUtil mysql=new MySQLUtil();mysql.setVisible(true);}
}