最近，我开始了解这个名为 Robospice 的库。在完成指南实施后，我开始使用它，但redistemplate无法将 Json 映射到 POJO
这是 POJO
@JsonIgnoreProperties(ignoreUnknown = true)
@JsonRootName(value = "results")
public class MovieData {
private Long id;
private String poster_path;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getPoster_path() {
return poster_path;
}
public void setPoster_path(String poster_path) {
this.poster_path = poster_path;
}
}
以下是上面的pojo
的列表类public class MovieDataList extends ArrayList<MovieData> {
private static final long serialVersionUID = 1L;
}
这是它尝试绑定到pojo的地方。
@Override
public MovieDataList loadDataFromNetwork() throws Exception {
String url = String.format("http://api.themoviedb.org/3/discover/movie?sort_by=popularity.desc&api_key=%s",api_key);
Log.v(LOG_TAG,url);
return getRestTemplate().getForObject(url,MovieDataList.class);
}
logcat的
10-22 22:44:08.430 25614-25635/com.singh.ritesh.movies E//DefaultRequestRunner.java:154﹕ 22:44:08.429 Thread-18129 An exception occurred during request network execution :Could not read JSON: Can not deserialize instance of com.singh.ritesh.movies.model.MovieDataList out of START_OBJECT token
at [Source: buffer(com.android.okio.GzipSource@3bbd7348).inputStream(); line: 1, column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.singh.ritesh.movies.model.MovieDataList out of START_OBJECT token
at [Source: buffer(com.android.okio.GzipSource@3bbd7348).inputStream(); line: 1, column: 1]
org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not deserialize instance of com.singh.ritesh.movies.model.MovieDataList out of START_OBJECT token
at [Source: buffer(com.android.okio.GzipSource@3bbd7348).inputStream(); line: 1, column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.singh.ritesh.movies.model.MovieDataList out of START_OBJECT token
at [Source: buffer(com.android.okio.GzipSource@3bbd7348).inputStream(); line: 1, column: 1]
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:125)
at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:147)
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:76)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:484)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)
at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:237)
at com.singh.ritesh.movies.request.MovieDataRequest.loadDataFromNetwork(MovieDataRequest.java:22)
at com.singh.ritesh.movies.request.MovieDataRequest.loadDataFromNetwork(MovieDataRequest.java:11)
at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:48)
at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:150)
at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:217)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of com.singh.ritesh.movies.model.MovieDataList out of START_OBJECT token
at [Source: buffer(com.android.okio.GzipSource@3bbd7348).inputStream(); line: 1, column: 1]
at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:219)
at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:212)
at org.codehaus.jackson.map.deser.std.CollectionDeserializer.handleNonArray(CollectionDeserializer.java:246)
at org.codehaus.jackson.map.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:204)
at org.codehaus.jackson.map.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:194)
at org.codehaus.jackson.map.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:30)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2732)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1923)
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:122)
at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:147)
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:76)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:484)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)
at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:237)
at com.singh.ritesh.movies.request.MovieDataRequest.loadDataFromNetwork(MovieDataRequest.java:22)
at com.singh.ritesh.movies.request.MovieDataRequest.loadDataFromNetwork(MovieDataRequest.java:11)
at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:48)
at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:150)
at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:217)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
来自服务器的响应
{
"page": 1,
"results": [
{
"adult": false,
"backdrop_path": "/dkMD5qlogeRMiEixC4YNPUvax2T.jpg",
"genre_ids": [
28,
12,
878,
53
],
"id": 135397,
"original_language": "en",
"original_title": "Jurassic World",
"overview": "Twenty-two years after the events of Jurassic Park, Isla Nublar now features a fully functioning dinosaur theme park, Jurassic World, as originally envisioned by John Hammond.",
"release_date": "2015-06-12",
"poster_path": "/uXZYawqUsChGSj54wcuBtEdUJbh.jpg",
"popularity": 88.551849,
"title": "Jurassic World",
"video": false,
"vote_average": 7.1,
"vote_count": 435
}
]
}
任何帮助将不胜感激。谢谢提前。
我终于解决了这个问题，服务器返回的数据是一个单独的jsonObject，我将它绑定到ArrayList。
我又创建了一个课程。
@JsonIgnoreProperties(ignoreUnknown = true)
public class MovieDataResult {
private List<MovieData> results;
public List<MovieData> getResults() {
return results;
}
public void setResults(List<MovieData> results) {
this.results = results;
}
}
返回的jsonObject被绑定到上面的类。哪个内容绑定到movieData pojo。
@Override
public MovieDataResult loadDataFromNetwork() throws Exception {
String url = String.format("http://api.themoviedb.org/3/discover/movie?sort_by=popularity.desc&api_key=%s",api_key);
return getRestTemplate().getForObject(url,MovieDataResult.class);
}