java实现简单TCP聊天程序

本文实例为大家分享了java实现tcp聊天程序的具体代码，供大家参考，具体内容如下

服务端代码：

package com.test.server;

import java.io.datainputstream;
import java.io.dataoutputstream;
import java.io.ioexception;
import java.net.serversocket;
import java.net.socket;

public class server {

 public static void main(string[] args) {
 new server().startserver();
 }

 public void startserver(){
 try {
  //服务器在9990端口监听客户端的连接
  serversocket ss = new serversocket(9999);
  system.out.println("server is listening...");
  while(true){
  //阻塞的accept方法，当一个客户端连接上，才会返回socket对象
  socket s = ss.accept();
  system.out.println("a client has connected!");
  //开启线程处理通信
  new communicatethread(s).start();
  }
 } catch (ioexception e) {
  e.printstacktrace();
 }
 }

 public class communicatethread extends thread{

 socket socket;
 datainputstream dis;
 dataoutputstream dos;

 public communicatethread(socket socket){
  this.socket = socket;
  try {
  dis = new datainputstream(socket.getinputstream());
  dos = new dataoutputstream(socket.getoutputstream());
  } catch (ioexception e) {
  e.printstacktrace();
  }
 }

 @override
 public void run() {
  super.run();
  //读取客户端发过来的消息
  string msg = null;
  try {
  while((msg = dis.readutf()) != null){
   system.out.println("client send msg ：" + msg);
   string replymsg = "server reply ： " + msg;
   dos.writeutf(replymsg);
   system.out.println("server reply msg ：" + replymsg);
  }
  } catch (ioexception e) {
  e.printstacktrace();
  }
 }
 }

}

客户端代码：

package com.test.client;

import java.io.datainputstream;
import java.io.dataoutputstream;
import java.io.ioexception;
import java.net.socket;
import java.util.scanner;

public class client {

 public static void main(string[] args) {
 new client().startclient();
 }

 public void startclient(){
 try {
  //连接到服务器
  socket socket = new socket("localhost", 9999);
  datainputstream dis = new datainputstream(socket.getinputstream());
  dataoutputstream dos = new dataoutputstream(socket.getoutputstream());
  scanner scanner = new scanner(system.in);
  string line = null;
  listenserverreply(dis);
  while((line = scanner.nextline()) != null){//读取从键盘输入的一行
  dos.writeutf(line);//发给服务端
  system.out.println("client send msg : " + line);
  }
 } catch (exception e) {
  e.printstacktrace();
 }
 }

 //监听服务端回复的消息
 public void listenserverreply(final datainputstream dis){
 new thread(){
  @override
  public void run() {
  super.run();
  string line = null;
  try {
   while((line = dis.readutf()) != null){
   system.out.println("client receive msg from server: " + line);
   }
  } catch (ioexception e) {
   e.printstacktrace();
  }
  }
 }.start();
 }

}

先启动服务端，再启动客户端，在客户端的控制台输入消息并回车，就可以发送消息给客户端了，客户端收到消息后，马上会回复一个消息

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/yubo_725/article/details/45331487