java登录监听代码 java监听端口

用java代码如何实现监听登陆用户的每个操作记录

建立一个监听器，在Session里放一个List保存每个用户的Session，这样能看到服务器上有哪些用户登陆了，以及他们的登录信息。每个用户的操作记录，建议你用log4j记录下就可以了，比方说，写到一个文本里。

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求JAVA的监听5038端口的代码。。。

服务端：

package com.socket;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java点虐 .ServerSocket;

import java点虐 .Socket;

public class Server {

public static void main(String[] args) throws IOException {

ServerSocket server = null;

Socket socket = null;

try {

server = new ServerSocket(5038);

while(true){

System.out.println("正在监听...");

if((socket = server.accept()) != null){

System.out.println("接收到一个请求"+ socket.getRemoteSocketAddress());

new Thread(new OperThread(socket)).start();

}

}

} catch (IOException e) {

System.out.println("waiting");

}

if(!socket.isConnected()){

socket.close();

server.close();

}

}

}

class OperThread implements Runnable{

Socket socket = null;

BufferedReader br = null;

public OperThread(Socket socket) throws IOException {

this.socket = socket;

br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

}

@Override

public void run() {

try {

String s = null;

while( (s = br.readLine()) != null){

System.out.println(s);

}

} catch (IOException e) {

e.printStackTrace();

} finally{

try {

br.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

客户端：

package com.socket;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java点虐 .Socket;

import java.util.Scanner;

public class Client {

public static void main(String[] args) throws IOException {

Socket socket = null;

PrintWriter pw = null;

Scanner scanner = new Scanner(System.in);

try {

socket = new Socket("127.0.0.1",5038);

pw = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));

String s = null;

while((s = scanner.nextLine()) != null){

pw.println(s);

pw.flush();

}

} catch (Exception e) {

System.out.println("\nconnect error");

}finally{

if(pw != null){

pw.close();

}

try {

if(socket != null){

socket.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

先开服务端，再开客户端。

求JAVA版QQ的按钮监听，当点击登录按钮的时候关闭登陆窗口打开正在登陆窗口。并注释原理。谢谢！

俺以前写的...

public void actionPerformed(ActionEvent e) {

if(e.getSource()==jp2_bt2){//判断按下了相应按钮。

if(!jp1_jtf.getText().trim().equals("")){//判断用户名和密码是否为空

User u = new User();//创建登陆用户向信息

u.setUid(jp1_jtf.getText().trim());

u.setUpd(new String(jp1_jpf.getPassword()).trim());

if(ClientBO.login(u)){//登陆并判断是否成功

System.out.println("成功");

UserInfo uinfo = ClientBO.getUserInfo(u.getUid());//从服务器得到用户信息

new Thread(new QQClientMain(uinfo)).start();//打开新窗口

this.dispose();//关闭登陆窗口

}else{

JOptionPane.showMessageDialog(this, "用户名或密码错误");

}

}

}

}

在java中 上一个 按钮监听代码怎么写

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.util.Random;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class TestRandom extends JFrame {

JTextField field;

JButton randomButton;

RandomNumber t = new RandomNumber();

public TestRandom() {

field = new JTextField(15);

randomButton = new JButton("产生随机数");

randomButton.addActionListener(new RandomListener());

this.getContentPane().setLayout(new FlowLayout());

this.getContentPane().add(field);

this.getContentPane().add(randomButton);

this.setSize(300,100);

this.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

this.setVisible(true);

}

class RandomListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

String actionCommand = randomButton.getText();

if(actionCommand.equals("产生随机数")) {

randomButton.setText("停止");

t.stop = false;

new Thread(t).start();

} else if(actionCommand.equals("停止")) {

randomButton.setText("产生随机数");

t.stop = true;

}

}

}

class RandomNumber implements Runnable {

Random random;

StringBuffer num;

boolean stop = false;

public RandomNumber() {

random = new Random();

num = new StringBuffer("");

}

public void run() {

while(!stop) {

num.setLength(0);

for(int i=0;i6;i++) {

num.append(random.nextInt(9));

}

field.setText(num.toString());

try {

Thread.sleep(200);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

public static void main(String[] args) {

new TestRandom();

}

}