java – 改造和杰克逊和解析JSON
发布时间:2020-12-14 17:48:04 所属栏目:Java 来源:网络整理
导读:我正在和杰克逊一起使用Retrofit.由于某些原因我无法解析以下 JSON: [ { "ProfileImage": null,"UserName": "joe" },{ "ProfileImage": "http://www.example.com/profiles/fileName1.jpg","UserName": "jane" },{ "ProfileImage": null,"UserName": "john"
我正在和杰克逊一起使用Retrofit.由于某些原因我无法解析以下
JSON:
[ { "ProfileImage": null,"UserName": "joe" },{ "ProfileImage": "http://www.example.com/profiles/fileName1.jpg","UserName": "jane" },{ "ProfileImage": null,"UserName": "john" } ] 我得到这个例外: Exception in thread "main" retrofit.RetrofitError: java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast to java.lang.Class at retrofit.RetrofitError.unexpectedError(RetrofitError.java:41) at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:294) at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:182) at com.sun.proxy.$Proxy5.getReplies(Unknown Source) at Test.main(Test.java:25) Caused by: java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast to java.lang.Class at JacksonConverter.fromBody(JacksonConverter.java:27) at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:274) 我的代码如下: // File:Test.java: public class Test { public static void main(String[] args) { ObjectMapper mapper = new ObjectMapper(); mapper.setPropertyNamingStrategy(new PropertyNamingStrategy .PascalCaseStrategy()); RestAdapter restAdapter = new RestAdapter.Builder() .setServer("http://www.example.com") .setConverter(new JacksonConverter(mapper)) .build(); ListingService listingService = restAdapter.create(ListingService.class); ArrayList<ListingReplyExt> replies = listingService.getReplies(123,1,10); //More code... } } // File:ListingService.java public interface ListingService { @GET("/api/ListingRepliesService.svc/Get") public ArrayList<ListingReplyExt> getReplies( @Query("listingId") long listingId,@Query("start") int start,@Query("count") int count); } // File:ListingReplyExt.java: @JsonIgnoreProperties(ignoreUnknown = true) public class ListingReplyExt { private String profileImage; private String username; @JsonProperty(value = "ProfileImage") public String getProfileImage() { return profileImage; } @JsonProperty(value = "ProfileImage") public void setProfileImage(String profileImage) { this.profileImage = profileImage; } @JsonProperty(value = "UserName") public String getUsername() { return username; } @JsonProperty(value = "UserName") public void setUsername(String username) { this.username = username; } } 任何帮助都是合法的. UPDATE Sotirios Delimanolis的评论给了我一些提示来解决这个问题. 我的JacksonConverter原来是这样的: public class JacksonConverter implements Converter { private final ObjectMapper objectMapper; public JacksonConverter(ObjectMapper objectMapper) { this.objectMapper = objectMapper; } @Override public Object fromBody(TypedInput body,Type type) { return objectMapper.readValue(body.in(),(Class<Object>) type); } //More code } 我改为: public class JacksonConverter implements Converter { private final ObjectMapper objectMapper; public JacksonConverter(ObjectMapper objectMapper) { this.objectMapper = objectMapper; } @Override public Object fromBody(TypedInput body,Type type) { JavaType javaType = objectMapper.getTypeFactory().constructType(type); return objectMapper.readValue(body.in(),javaType); } //More code } 现在它适用于我 解决方法
使用Square的转换器将其添加到您的build.gradle中:
compile 'com.squareup.retrofit:converter-jackson:1.9.0' 之后,您可以通过将.setConverter(新的JacksonConverter())添加到RestAdapter构建器来激活它. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |