java代码实现判断是否能ping通

原创

l8947943s 2022-10-21 16:25:33 博主文章分类：Java ©著作权

文章标签 java .net i++ 文章分类 运维

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package socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class TestSocket {
  public static void main(String[] args) throws IOException {
    StringBuilder sb1 = new StringBuilder();
    for (int i = 0; i < 5; i++) {
      Process p = Runtime.getRuntime().exec("ping " + "192.168.16."+ i);
      InputStream is = p.getInputStream();
      InputStreamReader isr = new InputStreamReader(is);
      BufferedReader br = new BufferedReader(isr);
      String line = null;
      StringBuilder sb = new StringBuilder();
      while((line = br.readLine())!=null) {
        sb.append(line);
      }
      if(null != sb && !sb.toString().equals("")) {
        String longString = "";
        if(sb.toString().indexOf("TTL")>0) {
          sb1.append("ping " + "192.168.16."+ i);
        }
        else {
          System.out.println("ping " + "192.168.16."+ i +"无法ping通");
        }
      }
    }
    System.out.println("以下可以ping通");
    System.out.println(sb1.toString());
  }
}

其实最主要的代码段是

if(null != sb && !sb.toString().equals("")) {
        String longString = "";
        if(sb.toString().indexOf("TTL")>0) {//能ping通过则有TTL字段，返回的index大于0
          sb1.append("ping " + "192.168.16."+ i);
        }
}