java Socket--tcp 一个服务器多客户端_java tcp服务端存储多个客户端-优快云博客

这篇博客展示了如何使用Java实现一个TCP服务器，该服务器能够处理多个客户端的连接请求。通过`ServerSocket`和`Socket`类创建服务器端和客户端的连接，使用`DataInputStream`和`DataOutputStream`进行数据的读写。服务器端代码创建了一个监听4000端口的服务器，每当有新的客户端连接时，会创建一个新的线程来处理。客户端则连接到服务器并发送字符串，服务器接收到非'bye'字符串时，会回传处理后的数据。

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按照java开发技术大全（刘新-清华出版社）的指导，今天尝试了一下java的网络作用

一下代码采用的是tcp/ip连接方式，代码不是很难

服务器端代码：

package com.mutouyihao; import java.net.ServerSocket; import java.net.Socket; //server文件 public class server { public static void main(String[] args){ try{ System.out.println("等待连接"); ServerSocket sk = new ServerSocket(4000); Socket connectToClient = null; while(true){ connectToClient=sk.accept(); System.out.println(connectToClient.getInetAddress()+"建立连接"); new ServerThread(connectToClient); } }catch (Exception e) { e.printStackTrace(); } } }

package com.mutouyihao; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.net.Socket; //供server调用 public class ServerThread extends Thread { private Socket connectToClient; private DataInputStream inFromClient; private DataOutputStream outToClient; public ServerThread(Socket soc) throws IOException { super(); connectToClient = soc; inFromClient = new DataInputStream(connectToClient.getInputStream()); outToClient = new DataOutputStream(connectToClient.getOutputStream()); start(); } public void run() { try { String str; boolean goon = true; while (goon) { str = inFromClient.readUTF(); if ( !str.equals("bye") ) { str = "return string" + str; outToClient.writeUTF(str); outToClient.flush(); } else { goon = false; outToClient.writeUTF("bye"); outToClient.flush(); } } inFromClient.close(); outToClient.close(); connectToClient.close(); } catch (Exception e) { e.printStackTrace(); } } }

client代码

package com.mutouyihao; import java.io.BufferedReader; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.InputStreamReader; import java.net.Socket; public class Client { public static void main(String[] args) { try { Socket connectionToServer = new Socket("localhost", 4000); DataInputStream inFromServer = new DataInputStream(connectionToServer.getInputStream()); DataOutputStream outToServer = new DataOutputStream(connectionToServer.getOutputStream()); System.out.println("input your number now:"); String outStr, inStr; boolean goon = true; BufferedReader buf = new BufferedReader(new InputStreamReader(System.in)); while (goon) { outStr = buf.readLine(); outToServer.writeUTF(outStr); outToServer.flush(); inStr = inFromServer.readUTF(); if ( !inStr.equals("bye") ) System.out.println("the returned data is:"+inStr); else goon = false; } inFromServer.close(); outToServer.close(); connectionToServer.close(); } catch (Exception e) { e.printStackTrace(); } } }