如何实现 Java SpringBoot 自动验证入参数据的有效性

Java SpringBoot 通过javax.validation.constraints下的注解，实现入参数据自动验证
如果碰到 @NotEmpty 否则不生效，注意看下 @RequestBody 前面是否加上了@Valid

Validation常用注解汇总

示例

 /* 用户名*/@NotBlank(message = "用户名不能为空")private String username;/* 用户真实姓名*/@NotBlank(message = "用户真实姓名不能为空")private String name;/* 密码*/@Pattern(regexp = "^(?:(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*[^A-Za-z0-9]))(?=^[^\\\\u4e00-\\\\u9fa5]{0,}$).{8,20}$", message = "密码过于简单有被盗风险，请保证密码大于8位，并且由大小写字母、数字，特殊符号组成")  private String password;/* 邮箱*/@NotBlank(message = "邮箱不能为空")@Email(message = "邮箱格式不正确")private String email;/* 手机号*/@NotBlank(message = "手机号不能为空")@Pattern(regexp = "^(1[0-9])\\\\d{9}$", message = "手机号格式不正确")private String mobile;

Demo

入参对象上，添加注解及说明

package com.vipsoft.web.entity;import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;
import java.io.Serializable;/* 定时任务调度*/
public class QuartzJob implements Serializable {private static final long serialVersionUID = 1L;/* 任务序号*/private long jobId;/* 任务名称*/@NotBlank(message = "任务名称不能为空")@Size(max = 10, message = "任务名称不能超过10个字符")private String jobName;/* 任务组名*/@NotBlank(message = "任务组名不能为空")@Size(max = 10, message = "任务组名不能超过10个字符")private String jobGroup;/* 调用目标字符串*/private String invokeTarget;/* 执行表达式*/private String cronExpression;/* cron计划策略 0=默认,1=立即触发执行,2=触发一次执行,3=不触发立即执行*/private String misfirePolicy = "0";/* 并发执行 0=允许,1=禁止*/private String concurrent;/* 任务状态（0正常 1暂停）*/private String status;/* 备注*/private String remark;
}

Controller @RequestBody 前面必须加上 @Valid 否则不生效

import javax.validation.Valid;@RestController
@RequestMapping("schedule")
public class ScheduleController {private Logger logger = LoggerFactory.getLogger(ScheduleController.class);@RequestMapping("/add")public ApiResult addTask(@Valid @RequestBody QuartzJob param) throws Exception {logger.info("添加调度任务 => {} ", JSONUtil.toJsonStr(param));return new ApiResult("添加成功");}
}

异常处理，统一返回对象，方便前端解析
GlobalExceptionHandler

package com.vipsoft.web.exception;import cn.hutool.core.util.StrUtil;
import com.vipsoft.web.utils.ApiResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.ObjectError;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;import java.util.List;/* 全局异常处理器*/
@RestControllerAdvice
public class GlobalExceptionHandler {private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);/* 处理自定义异常*/@ExceptionHandler(CustomException.class)public ApiResult handleException(CustomException e) {// 打印异常信息logger.error(" 异常信息:{} ", e.getMessage());return new ApiResult(e.getCode(), e.getMessage());}/* 参数错误异常*/@ExceptionHandler({MethodArgumentNotValidException.class, BindException.class})public ApiResult handleException(Exception e) {if (e instanceof MethodArgumentNotValidException) {MethodArgumentNotValidException validException = (MethodArgumentNotValidException) e;BindingResult result = validException.getBindingResult();StringBuffer errorMsg = new StringBuffer();if (result.hasErrors()) {List<ObjectError> errors = result.getAllErrors();errors.forEach(p -> {FieldError fieldError = (FieldError) p;errorMsg.append(fieldError.getDefaultMessage()).append(",");logger.error(" 请求参数错误：{" + fieldError.getObjectName() + "},field{" + fieldError.getField() + "},errorMessage{" + fieldError.getDefaultMessage() + "}");});return new ApiResult(6001, errorMsg.toString());}} else if (e instanceof BindException) {BindException bindException = (BindException) e;if (bindException.hasErrors()) {logger.error(" 请求参数错误: {}", bindException.getAllErrors());}}return new ApiResult(6001, "参数无效");}/* 处理HttpRequestMethodNotSupporte异常* @param e* @return*/@ExceptionHandler(HttpRequestMethodNotSupportedException.class)public Object methodHandler(HttpRequestMethodNotSupportedException e) {// 打印异常信息logger.error(" 异常信息:{} ", e.getMessage());return new ApiResult(6000, e.getMessage());}/* 处理所有不可知的异常*/@ExceptionHandler(Exception.class)public ApiResult handleOtherException(Exception e) {// 打印异常信息logger.error(" 系统内部错误:{} ", e.getMessage(), e);String warnMsg = StrUtil.isEmpty(e.getMessage()) ? " 系统内部错误 " : e.getMessage();return new ApiResult(6000, "系统内部错误", e.getMessage());}}

统一返回对像 ApiResult

package com.vipsoft.web.utils;//import com.github.pagehelper.PageInfo;import java.io.Serializable;public class ApiResult implements Serializable {/* 返回编码 0:失败、1：成功*/private int code;/* 返回消息*/private String message;/* 返回对象*/private Object data;/* 分页对象*/private Page page;public ApiResult() {this.code = 1;this.message = "请求成功";}public ApiResult(Integer code, String message) {this.code = code;this.message = message;}public ApiResult(Integer code, String message, Object data) {this.code = code;this.message = message;this.setData(data);}public ApiResult(Object data) {this.code = 1;this.message = "请求成功";this.setData(data);}//    public ApiResult(PageInfo pageInfo) {
//        this.code = 1;
//        this.message = "请求成功";
//        this.setData(pageInfo.getList());
//        this.setPage(convertToPage(pageInfo));
//    }
//
//    public Page convertToPage(PageInfo pageInfo) {
//        Page result = new Page();
//        result.setTotalCount(pageInfo.getTotal());
//        result.setPageNum(pageInfo.getPageNum());
//        result.setPageCount(pageInfo.getPages());
//        result.setPageSize(pageInfo.getPageSize());
//        result.setPrePage(pageInfo.getPrePage());
//        result.setNextPage(pageInfo.getNextPage());
//        return result;
//    }public int getCode() {return code;}public void setCode(int code) {this.code = code;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public Object getData() {return data;}public void setData(Object data) {this.data = data;}public Page getPage() {return page;}public void setPage(Page page) {this.page = page;}
}

运行结果如下