java - Spring Boot 无法从非字符串类型的字段的 POST 请求将 JSON 转换为 pojo

Question

 public class Dog {
   private String name;
   private int weight;
     //...getters and
    //setters and constructor 
 }

Controller :

 @RequestMapping(value = "/dogs", method = RequestMethod.POST, 
 produces = "application/json")
 public void createDog(Dog dog) {
    dr.save(dog); 
 }

当我用 json {"name":"bark", "weight":50} 调用端点时怎么办？我得到一个错误:

Failed to convert value of type 'null' to required type 'int'; nestedexception isorg.springframework.core.convert.ConversionFailedException: Failed toconvert from type [null] to type [int] for value 'null'; nestedexception is java.lang.IllegalArgumentException: A null value cannotbe assigned to a primitive type","objectName": "dog","field": "weight","rejectedValue": null,"bindingFailure": true,"code": "typeMismatch"

"message": "Validation failed for object='dog'. Error count: 1

编辑:我对 boolean 值和 double 值有同样的问题。我想我必须使用对象而不是基元？

Answer 1

将注解@RequestBody添加到create方法中的参数dog