Java 使用改进的JSON解析
我有一个示例JSON文件,我想用改型在Java中解析它。我对改型还不熟悉,对Java也有点陌生。我在网络上看到的例子并非如此 我现在清楚了。有人能解释一下我如何使用改装从以下JSON结构中提取movie_徽标字段吗Java 使用改进的JSON解析,java,json,parsing,retrofit,Java,Json,Parsing,Retrofit,我有一个示例JSON文件,我想用改型在Java中解析它。我对改型还不熟悉,对Java也有点陌生。我在网络上看到的例子并非如此 我现在清楚了。有人能解释一下我如何使用改装从以下JSON结构中提取movie_徽标字段吗 "url":"sample_url", "movies_metadata": { "movies": { "Movie 1": { "Description":"Sample description for
"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"
}
}
}
改型并没有真正用于将JSON解析为Java对象(在内部它实际上用于解析API响应)。我建议使用或解析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"));
}
}
}
如果您对GSON感兴趣,我可以提供一些样品。参见
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