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#Socket Java设置超时时间

Socket Client Example

// File Name GreetingClient.java
import java.net.*;
import java.io.*;

public class GreetingClient {

   public static void main(String [] args) {
      String serverName = args[0];
      int port = Integer.parseInt(args[1]);
      try {
         System.out.println("Connecting to " + serverName + " on port " + port);
         Socket client = new Socket(serverName, port);
         
         System.out.println("Just connected to " + client.getRemoteSocketAddress());
         OutputStream outToServer = client.getOutputStream();
         DataOutputStream out = new DataOutputStream(outToServer);
         
         out.writeUTF("Hello from " + client.getLocalSocketAddress());
         InputStream inFromServer = client.getInputStream();
         DataInputStream in = new DataInputStream(inFromServer);
         
         System.out.println("Server says " + in.readUTF());
         client.close();
      }catch(IOException e) {
         e.printStackTrace();
      }
   }
}

Socket Server Example

连接端口自定义，通过arg设置

// File Name GreetingServer.java
import java.net.*;
import java.io.*;

public class GreetingServer extends Thread {
   private ServerSocket serverSocket;
   
   public GreetingServer(int port) throws IOException {
      serverSocket = new ServerSocket(port);
      serverSocket.setSoTimeout(10000);
   }

   public void run() {
      while(true) {
         try {
            System.out.println("Waiting for client on port " + 
               serverSocket.getLocalPort() + "...");
            Socket server = serverSocket.accept();
            
            System.out.println("Just connected to " + server.getRemoteSocketAddress());
            DataInputStream in = new DataInputStream(server.getInputStream());
            
            System.out.println(in.readUTF());
            DataOutputStream out = new DataOutputStream(server.getOutputStream());
            out.writeUTF("Thank you for connecting to " + server.getLocalSocketAddress()
               + "\nGoodbye!");
            server.close();
            
         }catch(SocketTimeoutException s) {
            System.out.println("Socket timed out!");
            break;
         }catch(IOException e) {
            e.printStackTrace();
            break;
         }
      }
   }
   
   public static void main(String [] args) {
      int port = Integer.parseInt(args[0]);
      try {
         Thread t = new GreetingServer(port);
         t.start();
      }catch(IOException e) {
         e.printStackTrace();
      }
   }
}

设置超时

1.设置连接请求超时时间，如果连接无响应，则抛出超时异常

2.设置读操作超时时长，如过读取数据流时间超时，则抛出异常

Socket socket = new Socket();
socket.connect(new InetSocketAddress(ipAddress, port), 1000);//设置连接请求超时时间1 s
socket.setSoTimeout(30000);//设置读操作超时时间30 s

注意：socket.setSoTimeout必须在connect之后设置，不然将不会生效。读操作将永远不会超时。

参考：

https://www.tutorialspoint.com/java/java_networking.htm

http://stackoverflow.com/questions/4969760/set-timeout-for-socket

http://docs.oracle.com/javase/7/docs/api/java/net/Socket.html