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用swing mysql 写了一个QQ登录界面

发布时间： 2013-09-04 10:34:09 作者： rapoo

用swing mysql 写了一个QQ登录界面,但是功能实现不了，不能注册用户和登录验证


package com.MyQQ.test;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

/**
 * @author 
 * 2012-4-4
 */
public class QQFrame    extends  JFrame {
String  str1=null;  
String  str2=null;

JLabel  label1=new JLabel("用户名:");
JLabel  label2=new JLabel("密     码:");
JTextField  tf1=new JTextField(10);
JTextField  tf2=new JTextField(10);

JButton  bt1=new JButton("登陆");
JButton  bt2=new JButton("取消");
JButton  bt3=new JButton("注册");
public QQFrame() {
init();

}

public void  init(){
this.setTitle("QQVersion 0.1");

this.setBounds(200, 200, DEFULAT_WIDTH,DEFULAT_HEIGHT);

bt1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
str1=tf1.getText();
str2=tf2.getText();
new QQDB().check(str1, str2);
tf1.setText("");
tf2.setText("");
}
});
bt2.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
bt3.addActionListener(new  ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
str1=tf1.getText();
str2=tf2.getText();
new  QQDB().addAccount(str1, str2);

tf1.setText("");
tf2.setText("");
}
});



JPanel  p1=new JPanel();
JPanel  p2=new JPanel();
JPanel  p3=new JPanel();
p1.add(label1);
p1.add(tf1);
p2.add(label2);
p2.add(tf2);
p3.add(bt1);
p3.add(bt2);
p3.add(bt3);



this.setLayout(new  GridLayout(3,1));
this.add(p1);
this.add(p2);
this.add(p3);

this.pack();

}

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

@Override
public void run() {

JFrame   frame=new  QQFrame();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
});

}
private  static  final int DEFULAT_WIDTH=150; 
 

private  static  final  int DEFULAT_HEIGHT=80;

}









package com.MyQQ.test;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

/**
 * @author 
 *2012-4-4
 */
public class QQDB {
Connection conn=null;
PreparedStatement  ps=null;
ResultSet   res=null;

String  str1=null;
String  str2=null;

String   url="jdbc:mysql://localhost:3306/pwd?user=root&password=root";
public  QQDB(){
init();
}
public void init(){
try {
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection(url);
System.out.println("连接成功");

} catch (Exception e) {
   e.printStackTrace();
}
}
//把从文本框里面取的值传进来和数据库里面的对比
public void check(String  st1,String  st2){
this.str1=st1; this.str2=st2;

try {
String  sql="select  userPwd  from  pwd  where userName=str1";
ps=conn.prepareStatement(sql);
ps.execute();
res=ps.executeQuery();
if (ps.execute()) {
System.out.println("有此帐户 ");

if(str2.equals(res.getString("userPwd"))){
System.out.println("密码正确");
}else  {
System.out.println("密码不正确");
}
}
conn.close();
ps.close();
res.close();
} catch (Exception e) {
e.printStackTrace();
}

}
public  void  addAccount(String  st3,String  st4){
try {
String  sql2="insert into  pwd(userName,userPwd) values(st3,st4)";
ps=conn.prepareStatement(sql2);
ps.executeUpdate();
System.out.println("注册成功");

} catch (Exception e) {
 e.printStackTrace();
}
}

}



[解决办法]
String sql="select userPwd from pwd where userName=str1";
改成 String sql="select userPwd from pwd where userName='"+str1+"'";
[解决办法]
String sql2="insert into pwd(userName,userPwd) values(st3,st4)";
改成 String sql2="insert into pwd(userName,userPwd) values(？,？)";
ps.setString(str3);
ps.setString(str4);

[解决办法]
报错信息呢？帮你修改了一下


import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

/**
 * @author 
 * 2012-4-4
 */
public class QQFrame extends  JFrame {
    /**
 * 
 */
private static final long serialVersionUID = 1L;
String  str1=null;  
    String  str2=null;
    
    JLabel  label1=new JLabel("用户名:");
    JLabel  label2=new JLabel("密     码:");
    JTextField  tf1=new JTextField(10);
    JTextField  tf2=new JTextField(10);

    JButton  bt1=new JButton("登陆");
    JButton  bt2=new JButton("取消");
    JButton  bt3=new JButton("注册");
    public QQFrame() {
        init();
    }
    
public void  init(){
    this.setTitle("QQVersion 0.1");

    this.setBounds(200, 200, DEFULAT_WIDTH,DEFULAT_HEIGHT);

    bt1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) { 
 
            str1=tf1.getText();
            str2=tf2.getText();
            new QQDB().check(str1, str2);
            tf1.setText("");
            tf2.setText("");
}
    });
    
    bt2.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.exit(0);
        }
    });
    bt3.addActionListener(new  ActionListener() {
        public void actionPerformed(ActionEvent e) {
            str1=tf1.getText();
            str2=tf2.getText();
            new QQDB().addAccount(str1, str2);
            
            tf1.setText("");
            tf2.setText("");
        }
    });
    
    
    JPanel  p1=new JPanel();
    JPanel  p2=new JPanel();
    JPanel  p3=new JPanel();
    p1.add(label1);
    p1.add(tf1);
    p2.add(label2);
    p2.add(tf2);
    p3.add(bt1);
    p3.add(bt2);
    p3.add(bt3);
    
    this.setLayout(new  GridLayout(3,1));
    this.add(p1);
    this.add(p2);
    this.add(p3);
    this.pack();
}
    
    public static void main(String[] args) {
        
        EventQueue.invokeLater(new Runnable(){
            public void run(){ 
 
            JFrame frame=new QQFrame();
            frame.setVisible(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            }
        }
        );
    }
    private  static  final int DEFULAT_WIDTH=150;
    private  static  final  int DEFULAT_HEIGHT=80;
}

class QQDB {
    Connection conn=null;
    PreparedStatement ps=null;
    Statement stmt = null;
    ResultSet res=null;
    String  str1=null;
    String  str2=null;
    String url="jdbc:mysql://localhost:3306/pwd?user=root&password=root";
    public  QQDB(){
        init();
    }
    public void init(){
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn=DriverManager.getConnection(url);
            System.out.println("连接成功");
        } catch (SQLException e) {
           e.printStackTrace();
        } catch (ClassNotFoundException e) {
e.printStackTrace();
}
    }
    //把从文本框里面取的值传进来和数据库里面的对比
    public void check(String  st1,String  st2){
        this.str1=st1; this.str2=st2;
        try{
            String  sql="select  userPwd  from  pwd  where userName= '"+str1+"'";
            stmt = conn.createStatement();//用Statement
            res = stmt.executeQuery(sql);
            if(res.next()){//直接判断有木有结果集 
 
                System.out.println("有此帐户");
            if(str2.equals(res.getString("userPwd"))){
                System.out.println("密码正确");
            }else{
                System.out.println("密码不正确");
            }
            }
        } catch (SQLException e){
e.printStackTrace();
}    
        finally{
        try {
        stmt.close();
res.close();
        conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
           
        }
    }
    
    public  void  addAccount(String  str3,String  str4){
    
            String  sql2="insert into  pwd(userName,userPwd) values(?,?)";
            try {
ps=conn.prepareStatement(sql2);
ps.setString(1, str3);//跟数据库类型相对应
        ps.setString(2, str4);
        int resultInt = ps.executeUpdate();
        if(resultInt >= 0)System.out.println("注册成功");//一般不报错就能成功，可以不加判断。
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
ps.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}

}
            
    }

}

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