java代码实现外网IP的获取

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private static String getMyIP() throws IOException {        InputStream ins = null;        try {            String l = "http://1212.ip138.com/ic.asp";            URL url = new URL(l);            URLConnection con = url.openConnection();            ins = con.getInputStream();            InputStreamReader isReader = new InputStreamReader(ins, "gb2312");            BufferedReader bReader = new BufferedReader(isReader);            StringBuffer webContent = new StringBuffer();            String str = null;            while ((str = bReader.readLine()) != null) {                webContent.append(str);            }            System.out.println(webContent);            int start = webContent.indexOf("[") + 1;            int end = webContent.indexOf("]");            return webContent.substring(start, end);        } finally {            if (ins != null) {                ins.close();            }        }    }

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