本文介绍了一个简单的服务器客户端聊天系统，包括服务器端和客户端的实现，使用Socket进行通信，客户端能够实时接收并发送消息。
package com.chat.demo;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Iterator;
public class Server {
static final String SOCKT_IP = "127.0.0.1";
static final int SOCKT_PORT = 8888;
static int clientId = 0;
public static void main(String[] args) {
//用来存储连接客户端的socket
ArrayList<Socket> sockets = new ArrayList<Socket>();
try {
ServerSocket ss = new ServerSocket(8888);
while (true) {
Socket s = ss.accept();
sockets.add(s);
new ReadThread(s, sockets).start();
System.out.println("客户端的个数：" + sockets.size());
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
class ReadThread extends Thread {
private ArrayList<Socket> sockets;
private Socket socket;
boolean flag = true;
public ReadThread(Socket socket, ArrayList<Socket> sockets) {
this.socket = socket;
this.sockets = sockets;
}
public void run() {
try {
DataInputStream dis = new DataInputStream(
socket.getInputStream());
boolean isExit = false;
while (flag) {
String msg = dis.readUTF();
if(msg.contains("!q")){
msg = msg.replace("!q", "离开聊天室");
isExit = true;
}
System.out.println(msg);
if (msg != null && !msg.equals("")) {
for (Iterator iterator = sockets.iterator(); iterator
.hasNext();) {
Socket s = (Socket) iterator.next();
DataOutputStream dos = null;
if(s != socket){
dos = new DataOutputStream(s.getOutputStream());
dos.writeUTF(msg);
dos.flush();
}
}
}
if(isExit){
isExit = false;
flag = false;
sockets.remove(socket);
socket.close();
}
}
} catch (IOException e) {
}
}
}
************************************************************************************************************
package com.chat.demo;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class Client {
private int id; //编号
private String name; //客户端名称
private Date loginTime; //发送时间
private Socket sokcet; //与服务器连接的socket
private ClientRead cr;
private ClientWrite cw;
public Client(String name){
this.name = name;
this.id = Server.clientId++;
this.loginTime = new Date();
try {
this.sokcet = new Socket(Server.SOCKT_IP,Server.SOCKT_PORT);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
cr = new ClientRead(sokcet,this);
cw = new ClientWrite(sokcet,name,this);
}
public void start(){
cr.start();
cw.start();
}
public void close(){
System.exit(0);
}
public static void main(String[] args) {
// new Client("张三").start();
// new Client("李四").start();
new Client("王五").start();
}
}
class ClientRead extends Thread{
private Socket s;
private Client c;
public ClientRead(Socket s , Client c){
this.s = s;
this.c = c;
}
public void run(){
try {
while(true){
DataInputStream dis = new DataInputStream(
s.getInputStream());
String msg = dis.readUTF();
System.out.println(msg);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
class ClientWrite extends Thread{
private Socket s;
private String name;
boolean isLogin; //登录状态 默认为false
private Client c;
public ClientWrite(Socket s,String name,Client c){
this.s = s;
this.name = name;
this.isLogin = false;
this.c = c;
}
public void run(){
Scanner scan = new Scanner(System.in);
try {
DataOutputStream dis = new DataOutputStream(
s.getOutputStream());
while(true){
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
String sendTime = format.format(new Date());
String msg = null;
if(isLogin){
msg = name+"说："+scan.next()+"\t"+sendTime;
}else{
msg = "欢迎"+name+"\t"+sendTime;
isLogin = true;
}
dis.writeUTF(msg);
dis.flush();
if(msg.contains("!q")){
c.close();
}
}
} catch (IOException e) {
}
}
}
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