Jackson Annotations 简明教程

Jackson Annotations - @JsonCreator

@JsonCreator 用于对反序列化中使用的构造方法或工厂方法进行微调。我们将使用@JsonProperty来达到同样的目的。在下面的示例中,我们通过定义必需的属性名称将具有不同格式的json与我们的类进行匹配。

Example @JsonCreator

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

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonTester {
   public static void main(String args[]) throws ParseException{
      String json = "{\"id\":1,\"theName\":\"Mark\"}";
      ObjectMapper mapper = new ObjectMapper();
      try {
         Student student = mapper
            .readerFor(Student.class)
            .readValue(json);
         System.out.println(student.rollNo +", " + student.name);
      }
      catch (IOException e) {
         e.printStackTrace();
      }
   }
}
class Student {
   public String name;
   public int rollNo;

   @JsonCreator
   public Student(@JsonProperty("theName") String name, @JsonProperty("id") int rollNo){
      this.name = name;
      this.rollNo = rollNo;
   }
}

Output

1, Mark