Ping IP

Question

求助！怎样用JAVA判断IP是否有通！！！返回值是true或false

Answer 1

import java.io.BufferedReader;   
import java.io.IOException;   
import java.io.InputStream;   
import java.io.InputStreamReader;   
  
  
public class TestPing {   
    public static String testIP(String strip) {   
        String message = null;   
        Runtime runtime = Runtime.getRuntime();   
        Process process = null;   
        String line = null;   
        InputStream is = null;   
        InputStreamReader isr = null;   
        BufferedReader br = null;   
        String ip = strip;   
        try {   
            // 根据CMD去PING IP   
            process = runtime.exec("ping  " + ip + " -w 1");   
            is = process.getInputStream();   
            isr = new InputStreamReader(is);   
            br = new BufferedReader(isr);   
            while ((line = br.readLine()) != null) {   
                if ("Request timed out.".equals(line)   
                        || (line.length() > 3 && (line.trim()   
                                .indexOf("Ping request could not")) >= 0)) {   
                    message = "机器IP有错！";   
                }   
                System.out.println(line);   
            }   
            br.close();   
            isr.close();   
            is.close();   
        } catch (IOException e) {   
            e.printStackTrace();   
        }   
        return message;   
    }   
       
    public static void main(String[] args){   
        String result=TestPing.testIP("192.168.0.100");   
        System.out.println(result);   
    }   
}