Java Socket编程 标准范例（多线程）

服务器端（Server）非多线程

    package com.zeph.serverclient;            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 MyServer {          public static void main(String[] args) throws IOException {              ServerSocket server = new ServerSocket(5678);              Socket client = server.accept();              BufferedReader in = new BufferedReader(new InputStreamReader(                      client.getInputStream()));              PrintWriter out = new PrintWriter(client.getOutputStream());              while (true) {                  String str = in.readLine();                  System.out.println(str);                  out.println("has receive....");                  out.flush();                  if (str.equals("end"))                      break;              }              client.close();          }      } 

客户端（Client）

 <pre name="code" class="java">    package com.zeph.serverclient;            import java.io.BufferedReader;      import java.io.InputStreamReader;      import java.io.PrintWriter;      import java.net.InetAddress;      import java.net.Socket;            public class MyClient {          static Socket server;                public static void main(String[] args) throws Exception {              server = new Socket(InetAddress.getLocalHost(), 5678);              BufferedReader in = new BufferedReader(new InputStreamReader(                      server.getInputStream()));              PrintWriter out = new PrintWriter(server.getOutputStream());              BufferedReader wt = new BufferedReader(new InputStreamReader(System.in));              while (true) {                  String str = wt.readLine();                  out.println(str);                  out.flush();                  if (str.equals("end")) {                      break;                  }                  System.out.println(in.readLine());              }              server.close();          }      }  

服务器端（Server）多线程

<pre name="code" class="java">    package com.zeph.multiclient;            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 MultiClient extends Thread {          private Socket client;                public MultiClient(Socket c) {              this.client = c;          }                public void run() {              try {                  BufferedReader in = new BufferedReader(new InputStreamReader(                          client.getInputStream()));                  PrintWriter out = new PrintWriter(client.getOutputStream());                  // Mutil User but can't parallel                        while (true) {                      String str = in.readLine();                      System.out.println(str);                      out.println("has receive....");                      out.flush();                      if (str.equals("end"))                          break;                  }                  client.close();              } catch (IOException ex) {              } finally {              }          }                public static void main(String[] args) throws IOException {              ServerSocket server = new ServerSocket(5678);              while (true) {                  // transfer location change Single User or Multi User                        MultiClient mc = new MultiClient(server.accept());                  mc.start();              }          }      }  

测试这个代码的时候可以直接用DOS控制台上面运行，这样看的效果更清楚！

服务器基本步骤：

1.指定端口实例化一个SeverSocket

2.调用ServerSocket的accept()方法，以在等待连接期间造成阻塞

3.获取位于该底层的Socket的流以进行读写操作

4.将数据封装成流

5.对Socket进行读写

6.关闭打开的流

客户端基本步骤：

1.通过IP地址和端口实例化Socket，请求连接服务器

2.获得Socket上的流以进行读写

3.把流封装进BufferedReader/PrintWriter的实例

4.对Socket进行读写

5.关闭打开的流