springboot校验数据

 第一步导入jar

implementation 'org.springframework.boot:spring-boot-starter-validation'

第二步

package com.test.utils;


import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.EqualsAndHashCode;

import javax.validation.constraints.NotBlank;
import java.nio.charset.Charset;
import java.util.Calendar;
import java.util.Date;

@Data
@EqualsAndHashCode(callSuper = false)
@ApiModel(value="Demo对象")
public class Demo {
    @NotBlank(message = "名称不能为空")
    @ApiModelProperty(value = "用户名称")
    private String name;
}
第三步建立全局异常

package com.test.config;

import com.test.utils.ResultBean;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@ControllerAdvice
public class GlobalExceptionHandler {


    @ExceptionHandler(Exception.class)
    @ResponseBody
    public ResultBean handleException(Exception e){
        return  ResultBean.error(500,e.getMessage());
    }

    @ExceptionHandler(BindException.class)
    @ResponseBody
    public ResultBean validationErrorHandler(BindException ex) throws JsonProcessingException {
        //1.此处先获取BindingResult
        BindingResult bindingResult = ex.getBindingResult();
        //2.获取错误信息
        List<FieldError> fieldErrors = bindingResult.getFieldErrors();
        //3.组装异常信息
        Map<String,String> message = new HashMap<>();
        for (FieldError fieldError : fieldErrors) {
            message.put(fieldError.getField(),fieldError.getDefaultMessage());
        }
        //4.将map转换为JSON
        ObjectMapper objectMapper = new ObjectMapper();
        String json = objectMapper.writeValueAsString(message);
        //5.返回错误信息
        return ResultBean.error(json);
    }
}


第四步封装返回对象

package com.test.utils;

import lombok.Data;
import lombok.experimental.Accessors;

import java.io.Serializable;

/**
 * @author zys
 * @since 2021-05-14
 */
@Data
@Accessors(chain = true)
public class ResultBean<T> implements Serializable {

   private static final long serialVersionUID = 1L;

   public static final int NO_LOGIN = -1;

   public static final int SUCCESS = 0;

   public static final int FAIL = 1;

   private String msg = "success";

   private int code = SUCCESS;

   private long timestamp;

   private T data;

   public ResultBean() {
      super();
   }

   public ResultBean(T data) {
      super();
      this.data = data;
      this.timestamp = System.currentTimeMillis();
   }

   public ResultBean(Throwable e) {
      super();
      this.msg = e.toString();
      this.code = FAIL;
   }

   public static <T> ResultBean<T> ok(T data){
      ResultBean<T> rj = new ResultBean<>();
      rj.code = SUCCESS;
      rj.msg = "success";
      rj.timestamp = System.currentTimeMillis();
      rj.data = data;
      return rj;
   }

   public static ResultBean ok(){
      ResultBean rj = new ResultBean();
      rj.code = SUCCESS;
      rj.msg = "success";
      rj.timestamp = System.currentTimeMillis();
      return rj;
   }
   public static ResultBean error(String msg){
      ResultBean rj = new ResultBean();
      rj.code = FAIL;
      rj.msg = msg;
      rj.timestamp = System.currentTimeMillis();
      return rj;
   }

   public static ResultBean error(int code, String msg){
      ResultBean rj = new ResultBean();
      rj.code = code;
      rj.msg = msg;
      rj.timestamp = System.currentTimeMillis();
      return rj;
   }
}

第五步测试

@PostMapping("addDemo")
@ApiOperation(value = "校验数据", httpMethod = "POST")
public ResultBean addDemo(@RequestBody @Validated Demo demo){
    return  ResultBean.ok();
}