实践出真知，还得要多动手才行。今天做的放上来，实现了客户端的登陆功能，慢慢加功能，锻炼自己的j2se水平。。。功能太简单了（本人水平有限^o^)。
（一）客户端：
login.java
package vitaminclient;
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.net.*;
import java.io.*;
import java.util.*;
/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2006</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class Login extends JFrame
{
private String userName = "";//用户名
private String password = "";//密码
private Socket socket = null;//客户端socket
private java.io.BufferedReader in = null;//读数据的
private java.io.PrintWriter out = null;//向服务器写数据
private static final int SeverPort = 6018;//服务器端口
private String clientCmd = "";
private String serverMsg = "";
public Login() {
try {
jbInit();
} catch (Exception exception) {
exception.printStackTrace();
}
}
private void jbInit() throws Exception {
getContentPane().setLayout(null);
jPanel1.setBounds(new Rectangle(0, 0, 435, 327));
jPanel1.setLayout(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setResizable(false);
this.setTitle("登陆");
btnLogin.addActionListener(new Login_btnLogin_actionAdapter(this));
btnReset.addActionListener(new Login_btnReset_actionAdapter(this));
this.getContentPane().add(jPanel1);
tfName.setBounds(new Rectangle(139, 75, 178, 41));
jLabel2.setText("密码：");
jLabel2.setBounds(new Rectangle(56, 162, 74, 38));
tfPassword.setBounds(new Rectangle(137, 156, 182, 41));
btnLogin.setBounds(new Rectangle(90, 254, 87, 32));
btnLogin.setText("登陆");
btnReset.setBounds(new Rectangle(238, 251, 84, 34));
btnReset.setText("重置");
jPanel1.add(jLabel1);
jPanel1.add(jLabel2);
jPanel1.add(tfName);
jPanel1.add(tfPassword);
jPanel1.add(btnLogin);
jPanel1.add(btnReset);
jLabel1.setText("用户名:");
jLabel1.setBounds(new Rectangle(56, 76, 71, 38));
this.setLocation(310,200);
this.setSize(400,400);
}
public static void main(String[] args) {
Login login = new Login();
login.setVisible(true);
}
JPanel jPanel1 = new JPanel();
JLabel jLabel1 = new JLabel();
JTextField tfName = new JTextField();
JLabel jLabel2 = new JLabel();
JPasswordField tfPassword = new JPasswordField();
JButton btnLogin = new JButton();
JButton btnReset = new JButton();
public void btnLogin_actionPerformed(ActionEvent e)
{//用户登陆
int numRead;
if(tfName.getText().trim().length()==0)
{
javax.swing.JOptionPane.showMessageDialog(this,"请输入用户名!!!","用户登陆",JOptionPane.WARNING_MESSAGE);
return;
}
if(tfPassword.getPassword().length==0)
{
javax.swing.JOptionPane.showMessageDialog(this,"请输入密码!!!","用户登陆",JOptionPane.WARNING_MESSAGE);
return;
}
this.userName = tfName.getText().trim();//获取用户名
this.password = String.valueOf(tfPassword.getPassword());//获取密码
this.clientCmd = "login " +this.userName+" " +this.password;
//this.clientCmd = "login";
try
{
this.socket = new Socket(InetAddress.getLocalHost(),SeverPort);//连接服务器
this.in = new BufferedReader(new InputStreamReader(socket.getInputStream()));//从服务器读数据的
this.out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);//向数据库写数据的
out.println(this.clientCmd);
this.serverMsg = in.readLine();
if(this.serverMsg.equals(new String("LoginBad")))
{
javax.swing.JOptionPane.showMessageDialog(this,"登陆失败!!!");
return;
}
else if(this.serverMsg.equals(new String("LoginGood")))
{
vitaminclient.clientMain cm = new clientMain();
cm.setSize(200,500);
cm.setVisible(true);
this.dispose();
}
}
catch(java.io.IOException ex)
{
System.err.println(ex.getMessage().toString());
ex.printStackTrace();
}
catch(java.lang.Exception ex)
{
System.err.println(ex.getMessage().toString());
ex.printStackTrace();
}
}
public void btnReset_actionPerformed(ActionEvent e) {
this.tfName.setText("");
this.tfPassword.setText("");
}
}
class Login_btnReset_actionAdapter implements ActionListener {
private Login adaptee;
Login_btnReset_actionAdapter(Login adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent e) {
adaptee.btnReset_actionPerformed(e);
}
}
class Login_btnLogin_actionAdapter implements ActionListener {
private Login adaptee;
Login_btnLogin_actionAdapter(Login adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent e) {
adaptee.btnLogin_actionPerformed(e);
}
}
clientMain.java(开发中。。。）
（二）服务器端
数据库用的是Access,图个简单，反正是做着练手用的，能偷懒就尽量吧。。。。
业务逻辑和数据访问分开的，数据访问我封装了一个javaBean类来实现：
DBbase.java
package com.vitamin.DataAccess;
import java.sql.*;
public class DBbase {
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnstr = "jdbc:odbc:myDB";
Connection connect = null;
ResultSet rs = null;
Statement stmt = null;
public DBbase()
{
try
{
Class.forName(sDBDriver);
}
catch(ClassNotFoundException ex)
{
System.err.println(ex.getMessage());
}
}
public ResultSet executeQuery(String sql)
{
try
{
this.connect = DriverManager.getConnection(sConnstr);
this.stmt = this.connect.createStatement();
rs = stmt.executeQuery(sql);
}
catch(SQLException ex)
{
System.err.println(ex.getMessage());
}
return rs;
}
public int executeUpdate(String sql)
{
int result = 0;
try
{
this.connect = DriverManager.getConnection(sConnstr);
this.stmt = this.connect.createStatement();
result = stmt.executeUpdate(sql);
}
catch(SQLException ex)
{
System.err.println(ex.getMessage());
}
return result;
}
}
服务器端
为了简单，连GUI都不弄了，等后期再来完善吧，先把主要功能做出来再说：
server.java
package com.vitamin.vitaminserver;
import java.net.*;
import java.io.*;
/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2006</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class server
{
public static void main(String[] args) throws java.io.IOException
{
java.net.ServerSocket s = new ServerSocket(6018);
System.out.println("服务器启动:"+s);
try
{
while(true)
{
java.net.Socket socket = s.accept();
System.out.println("连接接受"+socket);
try
{
new ServerThread(socket);
}
catch(java.io.IOException ex)
{
socket.close();
}
}
}
catch(java.lang.Exception ex)
{
System.err.println(ex.getMessage().toString());
ex.printStackTrace();
}
finally
{
s.close();
}
}
}
ServerThread.java
package com.vitamin.vitaminserver;
import java.io.*;
import java.net.*;
import java.util.*;
import com.vitamin.DataAccess.*;
/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2006</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class ServerThread extends java.lang.Thread
{
private java.net.Socket socket = null;
private java.io.BufferedReader in = null;//读数据的
private java.io.PrintWriter out = null;//向客户写数据
private String clientMsg = "";
private String sql = "";
private java.sql.ResultSet rs = null;
public ServerThread()
{
super();
}
public ServerThread(Socket s)throws java.io.IOException
{
this.socket = s;
this.in = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
this.out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(this.socket.getOutputStream())),true);
this.start();//启动线程
}
public void run()
{
String[] msgTmp;
String spliter = " ";
try
{
while(true)
{
this.clientMsg = in.readLine();
System.out.println(this.clientMsg);
msgTmp = this.clientMsg.split(spliter);
System.out.println(msgTmp[0]);
if(msgTmp[0].equals(new String("login")))
{
String name = "";
String pwd = "";
System.out.println(this.clientMsg);
name = msgTmp[1];
pwd = msgTmp[2];
com.vitamin.DataAccess.DBbase myDb = new DBbase();
this.sql = "select count(*) as count from users where username='"+name+"' and password = '"
+pwd +"'";
this.rs = myDb.executeQuery(this.sql);
int result = 0;
if(rs.next())
{
result = rs.getInt("count");
}
if(result>=1)
{
this.out.println("LoginGood");
}
else
{
this.out.println("LoginBad");
}
}
else
{
}
}
}
catch(java.lang.Exception ex)
{
System.out.println(ex.getMessage().toString());
ex.printStackTrace();
}
try {
this.socket.close();
} catch (IOException ex1) {
}
}
}
运行结果：
自己水平有限，做的这个小东西实在拿不出手，但还是对自己有些帮助，我会继续努力的，
本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2006/06/22/432208.html，如需转载请自行联系原作者
