java判断socket是否断开的方法

try{ 
      socket.sendUrgentData(0xFF); 
}catch(Exception ex){ 
      reconnect(); 
}

package com.csdn.test; 
　　import java.io.BufferedReader; 
　　import java.io.IOException; 
　　import java.io.InputStreamReader; 
　　public class test { 
　　static BufferedReader bufferedReader; 
　　public static void main(String[] args) throws IOException { 
　　try { 
　　Process process = Runtime.getRuntime().exec("ping 192.168.1.104");//判断是否连接的IP; 
　　bufferedReader = new BufferedReader(new InputStreamReader(process 
　　.getInputStream())); 
　　String connectionStr = ""; 
　　while ((connectionStr = bufferedReader.readLine()) != null) { 
　　System.out.println(connectionStr); 
　　} 
　　} catch (IOException e) { 
　　e.printStackTrace(); 
　　} finally { 
　　bufferedReader.close(); 
　　} 
　　} 
　　}