我只想在我的类中包含具有自定义注释 @MyInclude
的字段,但 Jackson 最终忽略了所有内容。我做错了什么?
public static void main(String[] args) throws Exception {
ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
mapper.setAnnotationIntrospector(new IgnoreIntrospector());
MyNestedObject nestedObject = new MyNestedObject("value1", "value2");
MyObject object = new MyObject();
object.setNestedObject(nestedObject);
String json = mapper.writeValueAsString(object); //This returns {}
}
public static class IgnoreIntrospector extends JacksonAnnotationIntrospector {
private static final long serialVersionUID = -3951086067314107368L;
@Override
public boolean hasIgnoreMarker(AnnotatedMember m) {
return !m.hasAnnotation(MyInclude.class) || super.hasIgnoreMarker(m);
}
}
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class MyObject {
@MyInclude
private MyNestedObject nestedObject;
}
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class MyNestedObject {
@MyInclude
private String value1;
private String value2;
}
mapper.writeValueAsString(object)
正在返回 {}
,但它应该返回填充了 value1 的 NestedObject
(忽略 value2)。
如果我将 IgnoreIntrospector.hasIgnoreMarker ()
更新为 super.hasIgnoreMarker(m)
,那么所有内容都将包含在 json 字符串中。
最佳答案
只有 IgnoreIntrospector
是不够的。由于我的自定义注释仅在字段上,因此我需要禁用所有可见性:
mapper.setAnnotationIntrospector(new IgnoreIntrospector());
mapper.setVisibility(mapper.getSerializationConfig().getDefaultVisibilityChecker()
.withFieldVisibility(JsonAutoDetect.Visibility.ANY)
.withGetterVisibility(JsonAutoDetect.Visibility.NONE)
.withSetterVisibility(JsonAutoDetect.Visibility.NONE)
.withCreatorVisibility(JsonAutoDetect.Visibility.NONE));
mapper.setVisibility(mapper.getDeserializationConfig().getDefaultVisibilityChecker()
.withFieldVisibility(JsonAutoDetect.Visibility.ANY)
.withGetterVisibility(JsonAutoDetect.Visibility.NONE)
.withSetterVisibility(JsonAutoDetect.Visibility.NONE)
.withCreatorVisibility(JsonAutoDetect.Visibility.NONE));
并更新了我的IgnoreIntrospector
:
public static class IgnoreIntrospector extends JacksonAnnotationIntrospector {
@Override
public boolean hasIgnoreMarker(AnnotatedMember m) {
return m instanceof AnnotatedField && _findAnnotation(m, MyInclude.class) == null;
}
}
关于java - 使用 JacksonAnnotationIntrospector.hasIgnoreMarker() 包含带有自定义注释的字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40097251/