[导入]java Socket和ServerSocket多线程编程

[导入]java Socket和ServerSocket多线程编程

    这是在一本java教材上看到的，做了点修改。具体本教材记不清楚了，Sorry.放在这里，只是让自己需要的时候能够容易找到。

     程序分两部分，服务端和客户端。先把服务端运行起来，在运行客户端。整个过程就是客户端想服务端发送String,服务端再返回。客户端的String由键盘输入得到。

服务器端。

package net.tcp;

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

public class Server extends Thread
{

	ServerSocket server = null;
	Socket sk = null;
	BufferedReader rdr = null;
	PrintWriter wtr = null;

	public Server()
	{
		try
		{
			server = new ServerSocket(1987);
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
	}

	public void run()
	{

		while (true)
			{
				System.out.println("Listenning...");
				try
                {
//					每个请求交给一个线程去处理
	                sk = server.accept();
	                ServerThread th = new ServerThread(sk);
	                th.start();
					sleep(1000);
                }
                catch (Exception e)
                {
	                e.printStackTrace();
                }
				
			}
	}

	public static void main(String [] args)
	{
		new Server().start();
	}

	
	
	
	
	
	class ServerThread extends Thread
	{

		Socket sk = null;
		public ServerThread(Socket sk)
		{
			this.sk = sk;
		}
		public void run()
		{
			try
            {
	            wtr = new PrintWriter(sk.getOutputStream());
	            rdr = new BufferedReader(new InputStreamReader(sk
				        .getInputStream()));
				String line = rdr.readLine();
				System.out.println("从客户端来的信息：" + line);
//				特别，下面这句得加上     “\n”,
				wtr.println("你好，服务器已经收到您的信息！'" + line + "'\n");
				wtr.flush();
				System.out.println("已经返回给客户端！");
            }
            catch (IOException e)
            {
	            e.printStackTrace();
            }
			
		}
		
	}

}

客户端：

package net.tcp;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;

public class Client extends Thread
{

	Socket sk = null;
	BufferedReader reader = null;
	PrintWriter wtr = null;
	BufferedReader keyin = null;

	public Client()
	{
		keyin = new BufferedReader(new InputStreamReader(System.in));
		try
		{
			sk = new Socket("127.0.0.1", 1987);
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}

	}

	public void run()
	{
		try
		{
			reader = new BufferedReader(new InputStreamReader(sk
			        .getInputStream()));
			wtr = new PrintWriter(sk.getOutputStream());
			String get = keyin.readLine();

			while (true)
			{
				if (get != null & get.length() > 0)
				{
					wtr.println(get);
					wtr.flush();
//					wtr.close();
//					System.out.println(get + "发送完毕");
				}
				if (reader != null)
				{
					String line = reader.readLine();
					System.out.println("从服务器来的信息：" + line);
					
				}
				
			}
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	public static void main(String [] args)
	{
		new Client().start();
	}
}

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