1.导入依赖

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

2.测试类

package com.jmj.gulimall.product.testC;

import lombok.Data;

import javax.validation.constraints.NotNull;

@Data
public class Test {

    @NotNull(message = "id不能为空")
    private String id;
    @NotNull(message = "name不能为空")
    private String name;

}

3.接口Controller

@GetMapping("/getTest")
    public Test getTest(@Validated Test test){
        return test;
    }

4.异常处理器

    @ExceptionHandler(org.springframework.validation.BindException.class)
    public R handleValidException(org.springframework.validation.BindException e){
        System.out.println("进来了");
        BindingResult bindingResult = e.getBindingResult();
        List<FieldError> fieldErrors = bindingResult.getFieldErrors();
        HashMap<String, String> map = new HashMap<>();
        for (FieldError fieldError : fieldErrors) {
            String field = fieldError.getField();
            String defaultMessage = fieldError.getDefaultMessage();
            Object rejectedValue = fieldError.getRejectedValue();
            map.put(field,defaultMessage+":value="+rejectedValue);
        }
        return R.error(BizCodeEnum.RESOURCE_NOT_FOUND_EXCEPTION.getCode(),BizCodeEnum.RESOURCE_NOT_FOUND_EXCEPTION.getMsg()).put("data",map);
    }

5.访问 返回