使用改造的 JSON 解析

Posted 2023-03-22

【中文标题】使用改造的 JSON 解析

【英文标题】：JSON parsing using retrofit

【发布时间】：2014-07-16 21:19:24

【问题描述】：

我有一个示例 JSON 文件，我想使用改造在 Java 中进行解析。我是改造新手，对 Java 也有点陌生。我在网上看到的例子不是 我现在清楚。有人可以解释我如何使用改造从以下 JSON 结构中提取 movie_logo 字段吗？

  "url":"sample_url",
  "movies_metadata":
  
    "movies":
    
       "Movie 1":
        
          "Description":"Sample description for Movie 1",
           "Movie_Logo":"logo1.png"
        ,
        "Movie 2":
        
           "Description":"Sample description for Movie 2",
           "Movie_Logo":"logo1.png"
        ,
       "Movie 3":
        
           "Description":"Sample description for Movie 3",
           "Movie_Logo":"logo1.png"
        
      
   

【问题讨论】：

如果您对 GSON 感兴趣，我可以为您提供一些样品。

见***.com/questions/23070298/…

【参考方案1】：

Retrofit 并没有真正用于将 JSON 解析为 Java 对象（在内部它实际上使用 GSON 来解析 API 响应）。我建议使用JSON.org、GSON 或Jackson 来解析您的JSON 文件。最简单的方法是使用 JSON.org 解析器：

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.json.JSONArray;
import org.json.JSONObject;
import org.junit.Test;

@Slf4j
public class JsonTest 
    @Test
    public void test() throws Exception 
        HttpClient client = HttpClientBuilder.create().build();
        HttpGet request = new HttpGet("http://jsonblob.com/api/jsonBlob/5384f843e4b0441b35d1329d");
        request.addHeader("accept", "application/json");
        HttpResponse response = client.execute(request);
        String json = IOUtils.toString(response.getEntity().getContent());

        //here's where you're actually parsing the JSON
        JSONObject object = new JSONObject(json);
        JSONObject metadata = object.getJSONObject("movies_metadata");
        JSONObject movies = metadata.getJSONObject("movies");
        JSONArray movieNames = movies.names();
        for (int i = 1; i< movieNames.length(); i++) 
            String movieKey = movieNames.getString(i);
            log.info("The current object's key is ", movieKey);
            JSONObject movie = movies.getJSONObject(movieKey);
            log.info("The Description is ", movie.getString("Description"));
            log.info("The Movie_Logo is ", movie.getString("Movie_Logo"));
        
    

我将您的 JSON 放入 JSON Blob，然后使用他们的 API 在单元测试中请求它。单元测试的输出是：

14:49:30.450 [main] INFO  JsonTest - The current object's key is Movie 2
14:49:30.452 [main] INFO  JsonTest - The Description is Sample description for Movie 2
14:49:30.452 [main] INFO  JsonTest - The Movie_Logo is logo1.png
14:49:30.452 [main] INFO  JsonTest - The current object's key is Movie 1
14:49:30.453 [main] INFO  JsonTest - The Description is Sample description for Movie 1
14:49:30.453 [main] INFO  JsonTest - The Movie_Logo is logo1.png