无法从此链接获取 Jsonstring

Question

        String fileURL="https://tools.keycdn.com/geo.json?host=192.168.6.9";

    URL url = new URL(fileURL);
    HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
    int responseCode = httpConn.getResponseCode();
    System.out.println(responseCode);

完整代码： 试试 {

String url = "http://tools.keycdn.com/geo.json?host=192.168.6.9";

URL obj = new URL(url);
HttpURLConnection conn = (HttpURLConnection) obj.openConnection();
conn.setInstanceFollowRedirects(true);  
HttpURLConnection.setFollowRedirects(true);
conn.setReadTimeout(5000);
conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
conn.addRequestProperty("User-Agent", "Mozilla");
conn.addRequestProperty("Referer", "google.com");

System.out.println("Request URL ... " + url);

boolean redirect = false;

// normally, 3xx is redirect
int status = conn.getResponseCode();
if (status != HttpURLConnection.HTTP_OK) {
    if (status == HttpURLConnection.HTTP_MOVED_TEMP
        || status == HttpURLConnection.HTTP_MOVED_PERM
            || status == HttpURLConnection.HTTP_SEE_OTHER)
    redirect = true;
}

System.out.println("Response Code ... " + status);

if (redirect) {

    // get redirect url from "location" header field
    String newUrl =conn.getHeaderField("Location");
   newUrl=newUrl.replace("https://", "http://");
    // get the cookie if need, for login
    String cookies = conn.getHeaderField("Set-Cookie");

    // open the new connnection again
    conn = (HttpURLConnection) new URL(newUrl).openConnection();
    conn.setRequestProperty("Cookie", cookies);
    conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
    conn.addRequestProperty("User-Agent", "Mozilla");
    conn.addRequestProperty("Referer", "google.com");

    System.out.println("Redirect to URL : " + newUrl);

}

BufferedReader in = new BufferedReader(
                          new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer html = new StringBuffer();

while ((inputLine = in.readLine()) != null) {
    html.append(inputLine);
}
in.close();

System.out.println("URL Content... \n" + html.toString());
System.out.println("Done");

} catch (Exception e) {
e.printStackTrace();
}

} 输出： 请求网址...http://tools.keycdn.com/geo.json?host=192.168.6.9 响应代码 ... 301 重定向到网址：http://tools.keycdn.com/geo.json?host=192.168.6.9 网址内容... 301 永久移动

301 永久移动

---

nginx 完毕

我无法从此链接获取 json，它给出了 301 响应代码，我试图从 HTTP 标头部分获取重定向的 URL，尽管它返回相同的 URL 和相同的 301 响应代码，请提供 java 代码解决方案以获取此 URL 中的 JSON 字符串。

Answer 1

试试这个：

String fileURL="https://tools.keycdn.com/geo.json?host=192.168.6.9";
URL url;
    try
    {
        final String USER_AGENT = "Mozilla/5.0";
        url = new URL(fileURL);
        HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
        // optional default is GET
        httpConn.setRequestMethod("GET");
        //add request header
        httpConn.setRequestProperty("User-Agent", USER_AGENT);
        int responseCode = httpConn.getResponseCode();
        System.out.println(responseCode);

        BufferedReader in = new BufferedReader(
                new InputStreamReader(httpConn.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        //print result
        System.out.println(response.toString());

    }
    catch (Exception e)
    {
        e.printStackTrace();
    }