问题

我正在尝试获取此处找到的JSON文件：https://www.reddit.com/r/arabfunny/top.json?limit=100

我有以下代码：

static void getPost() throws Exception {
    String webPage = "https://www.reddit.com/r/arabfunny/top.json?limit=100";

    URL url = new URL(webPage);
    URLConnection request = url.openConnection();
    request.connect();

    JsonParser jp = new JsonParser();
    JsonElement root = jp.parse(new InputStreamReader((InputStream) request.getContent()));
    JsonObject rootobj = root.getAsJsonObject();
}

当运行此代码时，会抛出以下错误：

Exception in thread "main" java.io.IOException: 服务器返回了HTTP响应代码: 429，URL: https://www.reddit.com/r/arabfunny/top.json?limit=100

static void getPost() throws Exception {
    String webPage = "https://www.reddit.com/r/arabfunny/top.json?limit=100";

    URL url = new URL(webPage);
    URLConnection request = url.openConnection();
    request.connect();

    JsonParser jp = new JsonParser();
    JsonElement root = jp.parse(new InputStreamReader((InputStream) request.getContent()));
    JsonObject rootobj = root.getAsJsonObject();
}

Exception in thread "main" java.io.IOException: Server returned HTTP response code: 429 for URL: https://www.reddit.com/r/arabfunny/top.json?limit=100

答案1

得分: 1

修复问题是将Content type设置为UrlConnection

request.setRequestProperty("Content-Type", "application/json; utf-8");

完整的代码：

package com.example;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

/**
 * Hello world!
 */
public class App {
    public static void main(String[] args) throws IOException {
        String webPage = "https://www.reddit.com/r/arabfunny/top.json?limit=100";

        URL url = new URL(webPage);
        URLConnection request = url.openConnection();
        request.setRequestProperty("Content-Type", "application/json; utf-8");

        JsonParser jp = new JsonParser();
        JsonElement root = jp.parse(new InputStreamReader((InputStream) request.getContent()));
        JsonObject rootobj = root.getAsJsonObject();
        System.out.println(rootobj);
    }
}

<details>
<summary>英文:</summary>

Fix problem is set **Content type** to `UrlConnection`

    request.setRequestProperty(&quot;Content-Type&quot;, &quot;application/json; utf-8&quot;);

Full code:

    package com.example;
    
    import com.google.gson.JsonElement;
    import com.google.gson.JsonObject;
    import com.google.gson.JsonParser;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.net.URL;
    import java.net.URLConnection;
    
    /**
     * Hello world!
     */
    public class App {
        public static void main(String[] args) throws IOException {
            String webPage = &quot;https://www.reddit.com/r/arabfunny/top.json?limit=100&quot;;
    
            URL url = new URL(webPage);
            URLConnection request = url.openConnection();
            request.setRequestProperty(&quot;Content-Type&quot;, &quot;application/json; utf-8&quot;);
    
            JsonParser jp = new JsonParser();
            JsonElement root = jp.parse(new InputStreamReader((InputStream) request.getContent()));
            JsonObject rootobj = root.getAsJsonObject();
            System.out.println(rootobj);
        }
    }


[![Output-json][1]][1]


  [1]: https://i.stack.imgur.com/hnLEA.jpg

</details>



# 答案2
**得分**: 1

问题已通过添加以下内容得以解决：

    request.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2");

<details>
<summary>英文:</summary>

The problem was fixed by adding:

    request.setRequestProperty(&quot;User-Agent&quot;, &quot;Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2&quot;);

</details>