Java |验证包装器内的 JSON 个对象

Question

我正在使用 Java Spring 框架并收到 JSON 输入。它由数千个 MyObjects 的数组组成。如果 MyObjects 或 AnotherObjects 之一未通过约束（@NotNull 或 @Size），我希望应用程序抛出异常。到目前为止，应用程序在对对象执行某些操作时一旦访问 null 字段就会抛出 NullPointerException - 而不是在其构造期间。

我的问题是：

Is there a way to check the constraints of nested JSON objects preferrably with annotation?

JSON 看起来像：

{
  "myObjects": [
    {
      "code": "PQ",
      "another_objects": [
        {
          "attr1": "value1",
          "attr2": "value2",
          "attrN": "valueN"
        },
        {
          "attr1": "value1",
          "attr2": "value2",
          "attrN": "valueN"
        }
      ]
    },
    {
      ...
    }
  ]
}

servlet 看起来像：

@RequestMapping(value = ...)
public final void doSomething(@Valid @RequestBody MyObjectWrapper wrapper) {
    // do something very time-heavy here
}

对象定义如下：

public class MyObjectWrapper {
    private List<MyObject> myObjects;

    public List<MyObject> getMyObjects() {
        return myObjects;
    }

    public void setMyObjects(List<MyObjects> myObjects) {
        this.myObjects = myObjects;
    }
}

和 MyObject class:

public class MyObject {

    @NotNull
    @NotEmpty(message = ...)
    List<AnotherObject> anotherObjects;

    @NotNull
    @Size(min = 2, max = 2, message = ...)
    String code;

    @JsonCreator
    public MyObject(@JsonProperty("another_objects") List<AnotherObjects> anotherObjects,
                    @JsonProperty("code") String code) {
        this.code = code;
        this.anotherObjects = anotherObjects;
    }

    /*  getters and setters */
}

AnotherObjects 类似，但仅包含字符串。

Answer 1

将@Valid添加到包装器的嵌套对象

public class MyObjectWrapper {
    @Valid
    private List<MyObject> myObjects;

    public List<MyObject> getMyObjects() {
        return myObjects;
    }

    public void setMyObjects(List<MyObjects> myObjects) {
        this.myObjects = myObjects;
    }
}

Java |验证包装器内的 JSON 个对象

Java | Validating JSON objects inside wrapper

java

spring

json

bean-validation

spring-boot