socket

服务端

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketManager {
	/**
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) {
		SocketManager manager = new SocketManager();
		manager.doListen();
	}

	public void doListen() {
		ServerSocket server;
		try {
			server = new ServerSocket(9991);
			while (true) {
				Socket client = server.accept();
				new Thread(new SSocket(client)).start();
				System.out.println("**************************");
			}
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	// 服务器进程
	class SSocket implements Runnable {

		Socket client;

		public SSocket(Socket client) {
			this.client = client;
		}

		public void run() {
			BufferedInputStream input;
			PrintWriter output;
			try {
				 while(true){
				System.out.println(client.isClosed());
				System.out.println(client.isConnected());

				input = new BufferedInputStream(client.getInputStream());
				output = new PrintWriter(client.getOutputStream(),true);
				//
				System.out.println("等待接收数据：");

				String listMsg = readInputStream(input);//input.readUTF();
				if(listMsg!=null){
					output.println("Recive:  " + listMsg + "    \r\n Thx...");
					System.out.println("Recive:   " + listMsg);
				}else{
					client.close();
					break;
				}
				
				//listMsg = readInputStream(input);
//				output.println("Recive Second:  " + listMsg
//						+ "    \r\n Thx...");
//				System.out.println("Recive Second:   " + listMsg);
			 }

			} catch (IOException e) {
				e.printStackTrace();
			}
			System.out.println("结束");
		}

		private  String readInputStream(BufferedInputStream in)
				throws IOException {
			String data = "";
			int s = in.read();
			if (s == -1) {
				return null;
			}
			data += "" + (char) s;
			int len = in.available();
			if (len > 0) {
				byte[] byteData = new byte[len];
				in.read(byteData);
				data += new String(byteData);
			}

			return data;
		}
	}

}
客户端
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class SocketClient {

	public static void main(String[] args) {
		Socket socket = null;
		try {
			socket = new Socket("127.0.0.1", 9991);
			//向服务器端第一次发送字符串   
			OutputStream netOut = socket.getOutputStream();
			PrintWriter doc = new PrintWriter(netOut,true);
			BufferedInputStream in = new BufferedInputStream(socket.getInputStream());
			//向服务器端第二次发送字符串   
			doc.println("list");
			doc.flush();
			String res = readInputStream(in);
			System.out.println(res);
			doc.println("bye");
			res = readInputStream(in);
			System.out.println(res);
			doc.close();
			in.close();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (socket != null) {
				try {
					socket.close();
				} catch (IOException e) {
				}
			}
		}
	}
	
	private static String readInputStream(BufferedInputStream in) throws IOException {
        String data = "";
        int s = in.read();
        if (s == -1) {
			return null;
		}
        data += ""+(char)s;
        int len = in.available();
        if(len > 0) {
            byte[] byteData = new byte[len];
            in.read(byteData);
            data += new String(byteData);
        }
        return data;
    }
}