Jackson Annotations 简明教程

Jackson Annotations - @JacksonInject

@JacksonInject 用于将属性值注入，而不是从 JSON 输入中解析属性值。在下例中，我们将值插入对象，而不是从 JSON 中解析。

Example @JacksonInject

import java.io.IOException;
import java.text.ParseException;

import com.fasterxml.jackson.annotation.JacksonInject;
import com.fasterxml.jackson.databind.InjectableValues;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonTester {
   public static void main(String args[]) throws ParseException{
      String json = "{\"name\":\"Mark\"}";
      InjectableValues injectableValues = new InjectableValues.Std()
         .addValue(int.class, 1);

      ObjectMapper mapper = new ObjectMapper();
      try {
         Student student = mapper
            .reader(injectableValues)
            .forType(Student.class)
            .readValue(json);
         System.out.println(student.rollNo +", " + student.name);
      }
      catch (IOException e) {
         e.printStackTrace();
      }
   }
}
class Student {
   public String name;
   @JacksonInject
   public int rollNo;
}

Output

1, Mark