何时在Java的Jackson中使用@ConstructorProperties批注？
@ConstructorProperties注释是从java.bean小号包装，用于通过反序列化JSON到Java对象 注释构造。此注释从Jackson2.7版本开始支持。此批注的工作方式非常简单，而不是对构造函数中的每个参数进行注释，我们可以为数组提供每个构造函数参数的属性名称。
语法
@Documented @Target(value=CONSTRUCTOR) @Retention(value=RUNTIME) public @interface ConstructorProperties
示例
import com.fasterxml.jackson.databind.ObjectMapper;
import java.beans.ConstructorProperties;
public class ConstructorPropertiesAnnotationTest {
public static void main(String args[]) throws Exception {
ObjectMapper mapper = new ObjectMapper();
Employee emp = new Employee(115, "Raja");
String jsonString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(emp);
System.out.println(jsonString);
}
}
//员工阶层
class Employee {
private final int id;
private final String name; @ConstructorProperties({"id", "name"}) public Employee(int id, String name) {
this.id = id;
this.name = name;
}
public int getEmpId() {
return id;
}
public String getEmpName() {
return name;
}
}输出结果
{
"empName" : "Raja",
"empId" : 115
}