一，socket编程小例

1，socket编程小例

创建一个EchoServer和一个EchoClient类，EchoServer用于从监听从客户端输入的字符串，当客户端输入"bye"时停止

 

package com.test.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class EchoServer {
	private int port = 8000;
	private ServerSocket serverSocket;
	
	public static void main(String[] args) throws IOException {
		new EchoServer().service();
	}
	
	public EchoServer() throws IOException {
		serverSocket = new ServerSocket(port);
		System.out.println("服务器启用");
	}
	
	public String echo(String msg) {
		return "echo: " + msg;
	}

	private PrintWriter getWriter(Socket socket) throws IOException {
		OutputStream socketOut = socket.getOutputStream();
		return new PrintWriter(socketOut, true);
	}

	private BufferedReader getReader(Socket socket) throws IOException {
		InputStream socketIn = socket.getInputStream();
		return new BufferedReader(new InputStreamReader(socketIn));
	}
	
	public void service(){
		while(true){
			Socket socket = null;
			try{
				socket = serverSocket.accept();
				System.out.println("new connection accepted "
						+ socket.getInetAddress() + ":" + socket.getPort());
				BufferedReader br = getReader(socket);
				PrintWriter pw = getWriter(socket);
				String msg = null;
				while((msg =br.readLine()) != null){//输入，读取客户端的输入
					System.out.println(msg);
					pw.println(echo(msg));//输出，返回到客户端
					if(msg.endsWith("bye")){
						break;
					}
				}
			}catch (Exception e) {
				e.printStackTrace();
			}finally{
				try{
					if(socket != null){
						socket.close();
					}
				}catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
	}
}

 

package com.test.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class EchoClient {
	private String host = "localhost";
	private int port = 8000;
	private Socket socket;
	
	public EchoClient() throws UnknownHostException, IOException {
		socket = new Socket(host,port);
	}
	
	public static void main(String[] args) throws UnknownHostException, IOException{
		new EchoClient().talk();
	}
	
	private PrintWriter getWriter(Socket socket)throws IOException{
		OutputStream socketOut = socket.getOutputStream();
		return new PrintWriter(socketOut,true);
	}
	
	private BufferedReader getReader(Socket socket)throws IOException{
		InputStream socketIn = socket.getInputStream();
		return new BufferedReader(new InputStreamReader(socketIn));
	}
	
	public void talk()throws IOException{
		try{
			BufferedReader br = getReader(socket);
			PrintWriter pw = getWriter(socket);
			BufferedReader localReader  = new BufferedReader(new InputStreamReader(System.in));
			String msg = null;
			while((msg = localReader.readLine()) !=null ){//读取在管理控制台输入的字符串
				pw.println(msg);//向服务器端传送字符串
				System.out.println(br.readLine());//读取服务器端返回的字符串
				if(msg.equals("bye")){
					break;
				}
			}
		}catch (Exception e) {
			e.printStackTrace();
		}finally{
			try{
				socket.close();
			}catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}