简单的服务器与客户端程序

服务器端程序

EchoServer.java代码如下：

package com.network.test;

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

/**
 * 本例子是由服务器程序与客户端程序组成
 * 服务器程序一直监听本地8000端口，客户程序连接上本地8000端口，
 * 客户端向socket里面发送数据，并读取服务端返回的数据
 * 服务端读取socket里面的数据，并将数据处理后写入socket里面
 * @author yangjianzhou
 *
 */
public class EchoServer {
	public static void main(String[] args) throws Exception{
		new EchoServer().service();
	}

	private int port = 8000;
	private ServerSocket serverSocket;

	public EchoServer()throws Exception{
		serverSocket = new ServerSocket(port);
		System.out.println("服务器启动！");
	}

	public String echo(String msg){
		return "echo : "+msg;
	}

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

	private BufferedReader getReader(Socket socket)throws Exception{
		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){
					System.out.println(msg);
					pw.println(echo(msg));
					if(msg.equals("bye")){
						break;
					}
				}
			}catch (Exception e) {
				e.printStackTrace();
			}finally{
				try{
					if(socket!=null)
						socket.close();
				}catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
	}
}

客户端程序：

EchoClient.java代码如下：

  package com.network.test;

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

public class EchoClient {
	
	private String host = "localhost";
	private int port = 8000;
	private Socket socket;
	
	public static void main(String[] args) throws Exception{
		new EchoClient().talk();
	}
	
	public EchoClient() throws Exception{
		socket = new Socket(host,port);
	}
	
	private PrintWriter getWriter(Socket socket) throws Exception{
		OutputStream socketOut = socket.getOutputStream();
		return new PrintWriter(socketOut,true);
	}

	private BufferedReader getReader(Socket socket)throws Exception{
		InputStream socketIn = socket.getInputStream();
		return new BufferedReader(new InputStreamReader(socketIn));
	}
	
	public void talk() throws Exception{
		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){
				pw.println(msg);
				System.out.println(br.readLine());
				if(msg.equals("bye")){
					break;
				}
			}
		}catch (Exception e) {
			e.printStackTrace();
		}finally{
			try{
				if(socket!=null){
					socket.close();
				}
			}catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

运行结果如下：
服务器端：

 服务器启动！
New connection accepted /127.0.0.1:55726
yangjianzhou
bye

客户端：

yangjianzhou
echo : yangjianzhou
bye
echo : bye