我有以下课程:
public class Container { private String name; private Data data; } public class Data { private Long id; }
当我使用杰克逊序列化容器类时,我得到
{"name":"Some name","data":{"id":1}}
但我需要的结果是:
{"name":"Some name","id":1}
是否可以(不添加Container.getDataId()方法)?如果是这样,怎么办?
更新
我试图创建自定义JsonSerializer< Data>但结果与以前相同
public class JsonDataSerializer extends JsonSerializer<Data> { private static Logger logger = Logger.getLogger(JsonDataSerializer.class); @Override public void serialize(Data value,JsonGenerator jgen,SerializerProvider provider) throws IOException,JsonProcessingException { Long id = (value.getId() == null) ? 0l : value.getId(); jgen.writeStartObject(); jgen.writeNumberField("id",id); jgen.writeEndobject(); logger.debug("Data id " + id + " serialized to JSON."); } }
我还试图在Data类之上添加@JsonSerialize注释,然后在Container类中添加getter.如前所述,没有任何成功.我的串行器被使用,记录器日志消息.
更新2
当我删除writeStartObject()和writeEndobject(),然后没有JSON是returnesd,只有HTTP状态500错误,没有异常抛出,除了我在调试输出中找到.
DEBUG: org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver - Resolving exception from handler [com.example.DataController@16be8a0]: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Can not write a field name,expecting a value; nested exception is org.codehaus.jackson.JsonGenerationException: Can not write a field name,expecting a value DEBUG: org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver - Resolving exception from handler [com.example.DataController@16be8a0]: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Can not write a field name,expecting a value DEBUG: org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Resolving exception from handler [com.example.DataController@16be8a0]: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Can not write a field name,expecting a value
解决方法
杰克逊1.9已经引入了
JsonUnwrapped
注释,它是你正在寻找的.
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