1. 引入依赖

      <!--参数校验--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-validation</artifactId></dependency>

2. 校验规则

@NotNull(message = "【每页页码】不能为空")private int page;@NotNull(message = "【每页条数】不能为空")@Max(value = 100,message = "【每页条数】不能超过100")

3. 规则使用

 public CommonResp list(@Valid EbookQueryReq req) {}

4. 自定义异常类

package com.jiawa.wiki.controller;import com.jiawa.wiki.exception.BusinessException;
import com.jiawa.wiki.resp.CommonResp;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;/*** 统一异常处理、数据预处理等*/
@ControllerAdvice
public class ControllerExceptionHandler {private static final Logger LOG = LoggerFactory.getLogger(ControllerExceptionHandler.class);/*** 校验异常统一处理* @param e* @return*/@ExceptionHandler(value = BindException.class)@ResponseBodypublic CommonResp validExceptionHandler(BindException e) {CommonResp commonResp = new CommonResp();LOG.warn("参数校验失败：{}", e.getBindingResult().getAllErrors().get(0).getDefaultMessage());commonResp.setSuccess(false);commonResp.setMessage(e.getBindingResult().getAllErrors().get(0).getDefaultMessage());return commonResp;}

5. 统一返回对象封装

package com.jiawa.wiki.resp;public class CommonResp<T> {/*** 业务上的成功或失败*/private boolean success = true;/*** 返回信息*/private String message;/*** 返回泛型数据，自定义类型*/private T content;public boolean getSuccess() {return success;}public void setSuccess(boolean success) {this.success = success;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public T getContent() {return content;}public void setContent(T content) {this.content = content;}@Overridepublic String toString() {final StringBuffer sb = new StringBuffer("ResponseDto{");sb.append("success=").append(success);sb.append(", message='").append(message).append('\'');sb.append(", content=").append(content);sb.append('}');return sb.toString();}
}

6. 统一异常对象

package com.jiawa.wiki.exception;public class BusinessException extends RuntimeException{private BusinessExceptionCode code;public BusinessException (BusinessExceptionCode code) {super(code.getDesc());this.code = code;}public BusinessExceptionCode getCode() {return code;}public void setCode(BusinessExceptionCode code) {this.code = code;}/*** 不写入堆栈信息，提高性能*/@Overridepublic Throwable fillInStackTrace() {return this;}
}

7. 统一异常枚举

package com.jiawa.wiki.exception;public enum BusinessExceptionCode {USER_LOGIN_NAME_EXIST("登录名已存在"),LOGIN_USER_ERROR("用户名不存在或密码错误"),VOTE_REPEAT("您已点赞过"),;private String desc;BusinessExceptionCode(String desc) {this.desc = desc;}public String getDesc() {return desc;}public void setDesc(String desc) {this.desc = desc;}
}

8. 前端form表单输入，自动触发校验