如何在Java中确定路由器/网关的IP？ [英] How can I determine the IP of my router/gateway in Java?

问题描述

如何在Java中确定路由器/网关的IP？我可以轻松地获得我的IP。我可以使用网站上的服务获取我的互联网IP。但是如何确定网关的IP？

How can I determine the IP of my router/gateway in Java? I can get my IP easily enough. I can get my internet IP using a service on a website. But how can I determine my gateway's IP?

如果您了解自己的方式，这在.NET中有点容易。但是你是如何用Java做的呢？

This is somewhat easy in .NET if you know your way around. But how do you do it in Java?

推荐答案

遗憾的是，Java并不像其他语言那样令人愉快。这就是我的所作所为：

Java doesn't make this as pleasant as other languages, unfortunately. Here's what I did:

import java.io.*;
import java.util.*;

public class ExecTest {
    public static void main(String[] args) throws IOException {
        Process result = Runtime.getRuntime().exec("traceroute -m 1 www.amazon.com");

        BufferedReader output = new BufferedReader(new InputStreamReader(result.getInputStream()));
        String thisLine = output.readLine();
        StringTokenizer st = new StringTokenizer(thisLine);
        st.nextToken();
        String gateway = st.nextToken();
        System.out.printf("The gateway is %s\n", gateway);
    }
}

这假设网关是第二个令牌而不是第三。如果是，则需要添加额外的 st.nextToken（）; 以使标记生成器再推进一次。

This presumes that the gateway is the second token and not the third. If it is, you need to add an extra st.nextToken(); to advance the tokenizer one more spot.

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