Socket多线程实例

旧城等待， 2022-01-27 19:41 319阅读 0赞

转自：  
[https://www.cnblogs.com/sddychj/p/6102192.html][https_www.cnblogs.com_sddychj_p_6102192.html]

很久没有用到socket了，赶紧看了一下几个多线程socket的实例，担心以后会忘了，先记录下来一个比较简单的。

socket——套接字，是用来实现两个进程间通信的。

服务端是ServerSocket，客户端是Socket

实例：  
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();  
        }  
    }

[https_www.cnblogs.com_sddychj_p_6102192.html]: https://www.cnblogs.com/sddychj/p/6102192.html