Question

    @GET
@Produces("application/json")
public Response GetAll() throws JSONException{
    tblCategoryDao dao = new tblCategoryDao();
    List<tblcategory> categories= dao.getAllCategories();
    JSONArray JSONArray = new JSONArray(categories);
    return Response.status(200).entity(JSONArray).build();
}

以上是我的代码，用于返回类别列表的json。我正在使用JSONArray将列表转换为json字符串。我收到以下错误

  SEVERE: A message body writer for Java class org.json.JSONArray, and Java type class org.json.JSONArray, and MIME media type application/json was not found.
The registered message body writers compatible with the MIME media type are:
application/json ->
  com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$App
  com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$App
  com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$App
*/* ->
  com.sun.jersey.core.impl.provider.entity.FormProvider
  com.sun.jersey.core.impl.provider.entity.StringProvider
  com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
  com.sun.jersey.core.impl.provider.entity.FileProvider
  com.sun.jersey.core.impl.provider.entity.InputStreamProvider
  com.sun.jersey.core.impl.provider.entity.DataSourceProvider
  com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
  com.sun.jersey.core.impl.provider.entity.ReaderProvider
  com.sun.jersey.core.impl.provider.entity.DocumentProvider
  com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider
  com.sun.jersey.core.impl.provider.entity.SourceProvider$SourceWriter
  com.sun.jersey.server.impl.template.ViewableMessageBodyWriter
  com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General

实际问题是什么？

Answer 1

以下是解决方案：

return Response.status(200).entity(JSONArray.toString()).build();

您必须将.toString()添加到实体数据中。

泽西岛＆amp; JSONArray：Java类org.json.JSONArray和Java类型类org.json.JSONArray，未找到MIME媒体类型application / json

1 个答案: