3、java socket TCP 服務端

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 創建
 *   ServerSocket(int localPort) 
 *   ServerSocket(int localPort, int queueLimit) 
 *   ServerSocket(int localPort, int queueLimit, InetAddress localAddr)  //多個接口的服務器端只接受其中一個接口連接的主機非常有用
 *   ServerSocket()
 * ServerSocket 操作
 *   void bind(int port) 
 *   void bind(int port, int queuelimit)  
 *   Socket accept()   爲下次的socket連接請求創建Socket實例。並將已成功連接的socket實例返回給服務器端套接字。
 *   void close()
 * ServerSocket 獲取屬性
 *   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){
			//該方法阻塞等待
			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("總共：" + i + " 次");
			clntSock.close();
		}
	}
}