Java多个客户端同时连接服务端 在现实生活中用得比较多 同时执行多项任务 第一想到的当然是多线程了 下面用多线程来实现并发多连接
import java net *;import java io *;
public class ThreadServer extends Thread{ private Socket client;
public ThreadServer(Socket c) { this client=c; }
public void run() { try { BufferedReader in=new BufferedReader(new InputStreamReader(client getInputStream()));昌镇 PrintWriter out=new PrintWriter(client getOutputStream()); //Mutil User but can t parallel
while (true) { String str=in readLine();旁派 System out println(str); out println( has receive ); out flush(); if (str equals( end )) break; } client close(); } catch (IOException ex) { } finally {
运迅贺 } } public static void main(String[] args)throws IOException { ServerSocket server=new ServerSocket( ); while (true) { //transfer location change Single User or Multi User
lishixin/Article/program/Java/hx/201311/27248
2. 用java多线程实现服务器与客户端原理
服务器端：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import java.util.Vector;
public class OneToMoreServer extends JFrame implements ActionListener{
JPanel contentPane;
JLabel jLabel2 = new JLabel();
JTextField jTextField2 = new JTextField("4700");
JButton jButton1 = new JButton();
JLabel jLabel3 = new JLabel();
JTextField jTextField3 = new JTextField();
JButton jButton2 = new JButton();
JScrollPane jScrollPane1 = new JScrollPane();
JTextArea jTextArea1 = new JTextArea();
ServerSocket server = null;
Socket socket = null;BufferedReader instr =null;PrintWriter os=null ;
Vector vector=new Vector();
boolean serverRun=true;
boolean clientRun=true;
//Construct the frame
public OneToMoreServer() {
jbInit();
}
class MyThread extends Thread{//该线程负责接收数据
Socket socketI=null;
BufferedReader br=null;
public MyThread(Socket socket)
{
socketI=socket;
}
public void run(){
try{
while(clientRun){
this.sleep(100);
br= new BufferedReader(new InputStreamReader(socketI.getInputStream()));
if(br.ready()){ //检查是否有数据
jTextArea1.append("接收到来自客户端("+socketI.getInetAddress().toString()+")的消息: "+br.readLine()+"\n");
}
}
}catch(Exception ex){JOptionPane.showMessageDialog(null,ex.toString());}
}
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==jButton1){
int port=Integer.parseInt(jTextField2.getText().trim());
//监听指定端口
try
{
server = new ServerSocket(port);
new Thread(new ListenClient()).start();
}
catch(IOException ex)
{
JOptionPane.showMessageDialog(null,ex.toString());
}
}
if(e.getSource()==jButton2){
String msg=jTextField3.getText().trim();
if(msg.length()!=0)
sendData("hello");
}
}
//该线程负责监听指定端口
class ListenClient implements Runnable
{
public void run()
{
try{
if(jButton1.getText().trim().equals("侦听")){
jButton1.setText("正在侦听...");
while(serverRun)
{
Socket socketI=server.accept();//有客户端连入时建立一个线程监听客户端发送的消息
vector.add(socketI);
jButton1.setText("正在聊天...");
jTextArea1.append("客户端"+socketI.getInetAddress().toString()+"已经连接到服务器\n");
MyThread t=new MyThread(socketI);
t.start();
}
}
}catch(Exception ex){
JOptionPane.showMessageDialog(null,ex.toString());
}
}
}
private void sendData(String s){//发送数据
try{
for(int i=0;i<vector.size();i++)
{
//怎么广播?????
//向每个客户端发送一条消息
Socket socket=(Socket)vector.get(i);
os= new PrintWriter(socket.getOutputStream());
os.println(s);
os.flush();
}
}catch(Exception ex){
}
}
private void jbInit() {
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(null);
this.setSize(new Dimension(540, 340));
this.setTitle("服务器");
jLabel2.setBounds(new Rectangle(22, 27, 72, 28));
jLabel2.setText("端口号");
jLabel2.setFont(new java.awt.Font("宋体", 0, 14));
jTextField2.setBounds(new Rectangle(113, 27, 315, 24));
jButton1.setBounds(new Rectangle(440, 28, 73, 25));
jButton1.setFont(new java.awt.Font("Dialog", 0, 14));
jButton1.setBorder(BorderFactory.createEtchedBorder());
jButton1.setActionCommand("jButton1");
jButton1.setText("侦听");
jLabel3.setBounds(new Rectangle(23, 57, 87, 28));
jLabel3.setText("请输入信息");
jLabel3.setFont(new java.awt.Font("宋体", 0, 14));
jTextField3.setBounds(new Rectangle(114, 60, 314, 24));
jTextField3.setText("");
jButton2.setText("广播");
jButton2.setActionCommand("jButton1");
jButton2.setBorder(BorderFactory.createEtchedBorder());
jButton2.setFont(new java.awt.Font("Dialog", 0, 14));
jButton2.setBounds(new Rectangle(440, 58, 73, 25));
jScrollPane1.setBounds(new Rectangle(23, 92, 493, 189));
contentPane.add(jTextField2, null);
contentPane.add(jButton1, null);
contentPane.add(jLabel3, null);
contentPane.add(jTextField3, null);
contentPane.add(jButton2, null);
contentPane.add(jScrollPane1, null);
contentPane.add(jLabel2, null);
jScrollPane1.getViewport().add(jTextArea1, null);
jButton1.addActionListener(this);
jButton2.addActionListener(this);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
try{
socket.close();
instr.close();
System.exit(0);
}catch(Exception ex){
//JOptionPane.showMessageDialog(null,ex.toString());
}
}
});
}
public static void main(String arg[]){
JFrame.(true);
OneToMoreServer frm=new OneToMoreServer();
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setVisible(true);
}
}
客户端
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
public class Client extends JFrame implements ActionListener{
JPanel contentPane;
JLabel jLabel1 = new JLabel();
JTextField jTextField1 = new JTextField("127.0.0.1");
JLabel jLabel2 = new JLabel();
JTextField jTextField2 = new JTextField("4700");
JButton jButton1 = new JButton();
JLabel jLabel3 = new JLabel();
JTextField jTextField3 = new JTextField();
JButton jButton2 = new JButton();
JScrollPane jScrollPane1 = new JScrollPane();
JTextArea jTextArea1 = new JTextArea();
BufferedReader instr =null;
Socket socket = null;
PrintWriter os=null;
public Client() {
jbInit();
}
class MyThread extends Thread{
public void run(){
try{
os=new PrintWriter(socket.getOutputStream());
instr=new BufferedReader(new InputStreamReader(socket.getInputStream()));
while(true)
{
this.sleep(100);
if(instr.ready())
{
jTextArea1.append("接收到来自服务器的消息: "+instr.readLine()+"\n");
}
}
}catch(Exception ex){
JOptionPane.showMessageDialog(null,ex.toString());
}
}
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==jButton1){
String ip=jTextField3.getText().trim();
int port=Integer.parseInt(jTextField2.getText().trim());
connectServer(ip,port);
}
if(e.getSource()==jButton2){
String s=this.jTextField3.getText().trim();
sendData(s);
}
}
private void connectServer(String ip,int port){//连接
try{
if(jButton1.getText().trim().equals("连接")){
jButton1.setText("连接服务器...");
socket=new Socket(ip,port);
jButton1.setText("正在聊天");
MyThread t=new MyThread();
t.start();
}
}catch(Exception ex){
JOptionPane.showMessageDialog(this,ex.toString());
}
}
private void sendData(String s){//发送数据
try{
os = new PrintWriter(socket.getOutputStream());
os.println(s);
os.flush();
this.jTextArea1.append("向服务器发送消息:"+s+"\n");
}catch(Exception ex){
JOptionPane.showMessageDialog(this,ex.toString());
}
}
private void jbInit() {
contentPane = (JPanel) this.getContentPane();
jLabel1.setFont(new java.awt.Font("宋体", 0, 14));
jLabel1.setText("服务器名称");
jLabel1.setBounds(new Rectangle(20, 22, 87, 28));
contentPane.setLayout(null);
this.setSize(new Dimension(540, 340));
this.setTitle("客户端");
jTextField1.setBounds(new Rectangle(114, 26, 108, 24));
jLabel2.setBounds(new Rectangle(250, 25, 72, 28));
jLabel2.setText("端口号");
jLabel2.setFont(new java.awt.Font("宋体", 0, 14));
jTextField2.setBounds(new Rectangle(320, 27, 108, 24));
jButton1.setBounds(new Rectangle(440, 28, 73, 25));
jButton1.setFont(new java.awt.Font("Dialog", 0, 14));
jButton1.setBorder(BorderFactory.createEtchedBorder());
jButton1.setActionCommand("jButton1");
jButton1.setText("连接");
jLabel3.setBounds(new Rectangle(23, 57, 87, 28));
jLabel3.setText("请输入信息");
jLabel3.setFont(new java.awt.Font("宋体", 0, 14));
jTextField3.setBounds(new Rectangle(114, 60, 314, 24));
jButton2.setText("发送");
jButton2.setActionCommand("jButton1");
jButton2.setBorder(BorderFactory.createEtchedBorder());
jButton2.setFont(new java.awt.Font("Dialog", 0, 14));
jButton2.setBounds(new Rectangle(440, 58, 73, 25));
jScrollPane1.setBounds(new Rectangle(23, 92, 493, 189));
contentPane.add(jLabel1, null);
contentPane.add(jTextField1, null);
contentPane.add(jLabel2, null);
contentPane.add(jTextField2, null);
contentPane.add(jButton1, null);
contentPane.add(jLabel3, null);
contentPane.add(jTextField3, null);
contentPane.add(jButton2, null);
contentPane.add(jScrollPane1, null);
jScrollPane1.getViewport().add(jTextArea1, null);
jButton1.addActionListener(this);
jButton2.addActionListener(this);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
try{
socket.close();instr.close();os.close();System.exit(0);
}catch(Exception ex){
JOptionPane.showMessageDialog(null,ex.toString());
}
}
});
}
public static void main(String arg[]){
JFrame.(true);
Client frm=new Client();
frm.setVisible(true);
}
}