3、java socket TCP 服务端

最新推荐文章于 2025-11-01 12:31:35 发布

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本文介绍了一个简单的TCP回显服务器的实现过程。该服务器通过指定端口监听客户端连接请求，并将收到的数据原样返回给客户端。文章展示了如何使用Java创建ServerSocket对象来监听指定端口，如何使用Socket对象接收客户端连接并读取发送过来的数据，最后再通过Socket的输出流将数据回传给客户端。

package org.zhangmeng.test.eg_socket;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketAddress;

/***
 * ServerSocket 创建
 *   ServerSocket(int localPort) 
 *   ServerSocket(int localPort, int queueLimit) 
 *   ServerSocket(int localPort, int queueLimit, InetAddress localAddr)  //多个接口的服务器端只接受其中一个接口连接的主机非常有用
 *   ServerSocket()
 * ServerSocket 操作
 *   void bind(int port) 
 *   void bind(int port, int queuelimit)  
 *   Socket accept()   为下次的socket连接请求创建Socket实例。并将已成功连接的socket实例返回给服务器端套接字。
 *   void close()
 * ServerSocket 获取属性
 *   InetAddress getInetAddress() 
 *   SocketAddress getLocalSocketAddress() 
 *   int getLocalPort()
 */
public class TCPEchoServer {
	private static final int BUFSIZE = 2;
	public static void main(String[] args) throws Exception {
		
		int serverPort = 80;
		
		ServerSocket servSock = new ServerSocket(serverPort);
		
		int recvMsgSize ;
		
		System.out.println("start listen.");
		
		byte[] receiveBuf = new byte[BUFSIZE];
		
		while(true){
			//该方法阻塞等待
			Socket clntSock = servSock.accept();
			SocketAddress clientAddress = clntSock.getRemoteSocketAddress();
			System.out.println("Handing client at " + clientAddress);
			SocketAddress serverAddress = clntSock.getLocalSocketAddress();
			System.out.println("Handing server at " + serverAddress);
			InputStream in = clntSock.getInputStream();
			OutputStream out = clntSock.getOutputStream();
			int i = 0 ;
			while((recvMsgSize = in.read(receiveBuf)) != -1){
				++i;
				out.write(receiveBuf, 0 ,recvMsgSize);
			}
			System.out.println("总共：" + i + " 次");
			clntSock.close();
		}
	}
}