Java-List的对象的校验不起作用的解决方案

记录工作学习中的点点滴滴~

在spring框架下，使用 javax.validation.* 校验参数的时候，对 java.util.List 的对象的校验不起作用。

请求方式 POST

请求参数格式 application/json

package com.tsing0520.config;

import org.springframework.validation.BindException;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

@ControllerAdvice
public class GlobalExceptionHandler {
     /**
     * 参数校验异常处理 (@RequestParam注解抛出)
     * @param ex
     * @return
     */
    @ExceptionHandler(BindException.class)
    @ResponseBody
    public String handleBindException(BindException ex) {
        StringBuilder stringBuilder = new StringBuilder();
        for (FieldError error : ex.getBindingResult().getFieldErrors()){
            stringBuilder.append(error.getDefaultMessage()).append(",");
        }
        String msg = stringBuilder.substring(0, stringBuilder.length() -1);
        return msg;
    }
    
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseBody
    public String validException(MethodArgumentNotValidException ex) {
        StringBuilder stringBuilder = new StringBuilder();
        for (FieldError error : ex.getBindingResult().getFieldErrors()) {
            stringBuilder.append(error.getDefaultMessage()).append(",");
        }
        String msg = stringBuilder.substring(0, stringBuilder.length() -1);
        return msg;
    }
}

package com.tsing0520.controller;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.tsing0520.model.param.PersonListParam;
import com.tsing0520.model.param.PersonParam;

import cn.hutool.json.JSONUtil;

@ResponseBody
@Controller
@RequestMapping("/verifyparam")
public class ValidateParamController {
    
    @PostMapping("/uploadPerson")
    public String uploadPerson(@RequestBody @Valid PersonParam personParam) {
        System.out.println(JSONUtil.toJsonStr(personParam));
        return "uploadPerson...success";
    }
    
    
    @PostMapping("/batchUploadPerson")
    public String batchUploadPerson(@RequestBody @Valid PersonListParam personListParam) {
        System.out.println(JSONUtil.toJsonStr(personListParam));
        return "batchUploadPerson...success";
        
    }
    
}

package com.tsing0520.model.param;

import javax.validation.constraints.Min;
import javax.validation.constraints.NotBlank;

import lombok.Data;

@Data
public class PersonParam {
    
    @Min(value=1,message="id最小值为1")
    private Integer id;
    
    @NotBlank(message="name不能为空")
    private String name;
    
}

未起作用的代码

package com.tsing0520.model.param;

import java.util.List;

// import javax.validation.Valid;
import javax.validation.constraints.NotEmpty;

import lombok.Data;

@Data
public class PersonListParam {
    
    // @Valid
    @NotEmpty(message="personParamList不能为空")
    List<PersonParam> personParamList;
}

{
    "personParamList": [
        {
            "name": "abc",
            "id": 0
        },
        {
            "name": "abc",
            "id": 0
        }
    ]
}

修改之后的代码

package com.tsing0520.model.param;

import java.util.List;

 import javax.validation.Valid;
import javax.validation.constraints.NotEmpty;

import lombok.Data;

@Data
public class PersonListParam {
    
    @Valid
    @NotEmpty(message="personParamList不能为空")
    List<PersonParam> personParamList;
}