Java中@JsonFilter注释的重要性？

Importance of @JsonFilter annotation in Java?

句法

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@Target(value={ANNOTATION_TYPE,TYPE,METHOD,FIELD,PARAMETER})
@Retention(value=RUNTIME)
public @interface JsonFilter

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import com.fasterxml.jackson.annotation.JsonFilter;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
public class JsonFilterAnnotationTest {
public static void main(String args[]) throws JsonProcessingException {
ObjectMappermapper = new ObjectMapper();
FilterProviderfilterProvider = new SimpleFilterProvider().addFilter("customFilter", SimpleBeanPropertyFilter.filterOutAllExcept("empName"));
String jsonString = mapper.writer(filterProvider).writeValueAsString(new FilterBean());
System.out.println(jsonString);
}
}
@JsonFilter("customFilter")
class FilterBean {
public int empId = 110;
public String empName ="Raja Ramesh";
public String gender ="male";
}

输出量

1	{"empName":"Raja Ramesh"}