我有一个示例 JSON 文件,我想使用 Retrofit 在 Java 中解析该文件。我对 Retrofit 很陌生,对 Java 也有点陌生。我在网上看到的例子不是 我现在就清楚了。有人可以解释一下如何使用 Retrofit 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"
}
}
}
最佳答案
Retrofit 并不是真正用于将 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用于解析您的 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"));
}
}
}
我将你的 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
关于java - 使用Retrofit进行JSON解析,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23898266/