java判断socket服务端是否断开连接

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();
		}
	}
}