秒杀项目之登录

一、项目前准备 1、新建项目

2、导入依赖


        
            org.springframework.boot
            spring-boot-starter
        
        
            org.springframework.boot
            spring-boot-starter-aop
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.springframework.boot
            spring-boot-starter-freemarker
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            mysql
            mysql-connector-java
            runtime
        
        
            org.projectlombok
            lombok
            true
        
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.5.1
        
        
        
            com.baomidou
            mybatis-plus-generator
            3.5.2
        
        
        
            commons-codec
            commons-codec
        
        
            org.apache.commons
            commons-lang3
            3.12.0
        
        
        
            org.springframework.boot
            spring-boot-starter-validation
        
        
        
            org.springframework.boot
            spring-boot-starter-data-redis
        
        
        
            com.zaxxer
            HikariCP
        
        
        
            io.springfox
            springfox-swagger2
            2.9.2
        
        
        
            io.springfox
            springfox-swagger-ui
            2.9.2

3、执行sql脚本

得到表：

首先查看登录的表数据：

4、配置yml文件

spring:
  application:
    name: seckill
  datasource:
    url: jdbc:mysql://localhost:3306/seckill?useSSL=false&useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai&characterEncoding=UTF8
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: 123456
    hikari:
      # 最小空闲连接数量
      minimum-idle: 5
      # 空闲连接存活最大时间，默认600000（10分钟）
      idle-timeout: 180000
      # 连接池最大连接数，默认是10
      maximum-pool-size: 10
      # 此属性控制从池返回的连接的默认自动提交行为,默认值：true
      auto-commit: true
      # 连接池名称
      pool-name: MyHikariCP
      # 此属性控制池中连接的最长生命周期，值0表示无限生命周期，默认1800000即30分钟
      max-lifetime: 1800000
      # 数据库连接超时时间,默认30秒，即30000
      connection-timeout: 30000
  freemarker:
    #设置编码格式
    charset: UTF-8
    #后缀
    suffix: .ftl
    #文档类型
    content-type: text/html
    #模板前端
    template-loader-path: classpath:/templates/
    #启用模板
    enabled: true
#    开启静态资源
  mvc:
    static-path-pattern: /static, builder) ->
                                builder.author(scanner.apply("请输入作者名称？"))
                                        .enableSwagger()
                                        .fileOverride()
                                        .outputDir(System.getProperty("user.dir") + "\src\main\java")
                                        .commentDate("yyyy-MM-dd")
                                        .dateType(DateType.TIME_PACK)
                )
                .packageConfig((builder) ->
                        builder.parent("com.example.seckill")
                                .entity("pojo")
                                .service("service")
                                .serviceImpl("service.impl")
                                .mapper("mapper")
                                .xml("mapper.xml")
                                .pathInfo(Collections.singletonMap(OutputFile.xml, System.getProperty("user.dir") + "\src\main\resources\mapper"))
                )
                .injectionConfig((builder) ->
                        builder.beforeOutputFile(
                                (a, b) -> log.warn("tableInfo: " + a.getEntityName())
                        )
                )
                .strategyConfig((scanner, builder) ->
                        builder.addInclude(getTables(scanner.apply("请输入表名，多个英文逗号分隔？所有输入 all")))
                                .addTablePrefix("tb_", "t_")
                                .entityBuilder()
                                .enableChainModel()
                                .enableLombok()
                                .enableTableFieldAnnotation()
                                .addTableFills(
                                        new Column("create_time", FieldFill.INSERT)
                                )
                                .controllerBuilder()
                                .enableRestStyle()
                                .enableHyphenStyle()
                                .build())
                .templateEngine(new FreemarkerTemplateEngine())
                .execute();
    }

    protected static List getTables(String tables) {
        return "all".equals(tables) ? Collections.emptyList() : Arrays.asList(tables.split(","));
    }

}

相关文件生成：

自动生成时，mapper文件未加入注解，无法加载到spring容器中

@Repository

二、前端构建 1、导入layui

2、将界面放到template

head.ftl文件：


秒杀项目






<#assign ctx>
    ${springMacroRequestContext.getContextPath()}

goodsList.ftl文件：




    <#include "../common/head.ftl">


这是商品展示界面




    <#include "common/head.ftl"/>
    
        .layui-panel {
            position: absolute;
            width: 400px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            padding: 15px 15px 0px 15px;
            border-radius: 20px;
        }

        .layui-form-label {
            padding: 9px 0px;
        }

        h3 {
            text-align: center;
            line-height: 45px;
            font-size: 40px;
            color: white;
            padding-bottom: 15px;
        }
    



    
        用户登录
        
            用户账号
            
                
            
        
        
            用户密码

新建Javascript文件login：

layui.define(()=>{
    // 得到layui中封装的jquery
    let $=layui.jquery
    // 给登录按钮设置事件
    $(login).click(()=>{
     // 取到表单的值
    let mobile = $("#mobile").val();
    let password=$("#password").val();
    // 将数据给后台（前后端分离axios,普通开发ajax）
       $.ajax({
           url:"",//后台登录接口
           data:{
             // 需要携带的数据
               mobile,
               password
           },
           datatype: "json",//后端给你的数据类型
           success(e){
               // 成功的回调函数

           },
           error(e){
               // 报错的回调函数

           }

       })
    })


})

4、新建controller类

专门用于跳转路径：PathController类

package com.example.seckill.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class PathController {

//    登录跳首页
    @RequestMapping("/")
    public String toPath(){
        return "login";
    }

//    跳所有二级页面
    @RequestMapping("/{dir}/{path}")
    public String toPath(@PathVariable("dir") String dir,@PathVariable("path") String path){
        return dir+"/"+path;
    }

}

得到界面：

三、MD5加密 1、导入帮助包与exception包 ①、exception

package com.example.seckill.exception;

import com.example.seckill.util.response.ResponseResultCode;
import lombok.Data;

@SuppressWarnings("all")
@Data
public class BusinessException extends RuntimeException {

    private ResponseResultCode responseResultCode;

    public BusinessException(ResponseResultCode responseResultCode) {
        this.responseResultCode = responseResultCode;
    }

}

②、response包，用于后面的全局异常 JsonResponseParse ：

package com.example.seckill.util.response;

import lombok.extern.slf4j.Slf4j;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

@SuppressWarnings("all")
@RestControllerAdvice
@Slf4j
public class JsonResponseParse implements ResponseBodyAdvice {

    @Override
    public boolean supports(MethodParameter methodParameter, Class aClass) {
        //返回值决定他是否需要进入beforeBodyWrite
        return methodParameter.getMethod().isAnnotationPresent(JsonResponseResult.class);
    }

    @Override
    public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
        //更改返回值
        if (o == null) {
            return ResponseResult.success();
        }
        if (o instanceof Integer) {
            return ResponseResult.failure(ResponseResultCode.queryCode((Integer) o));
        }
        if (o instanceof ResponseResultCode) {
            return ResponseResult.failure((ResponseResultCode) o);
        }
        if (o instanceof ResponseResult) {
            return o;
        }
        return ResponseResult.success(o);
    }

}

JsonResponseResult ：

package com.example.seckill.util.response;

import java.lang.annotation.*;

@SuppressWarnings("all")
@Retention(value = RetentionPolicy.RUNTIME)
@documented
@Target({ElementType.METHOD})
public @interface JsonResponseResult {

}

ResponseResult：

package com.example.seckill.util.response;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@SuppressWarnings("all")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class ResponseResult implements Serializable {

    private int code;
    private String message;
    private T data;
    private Long total;

    
    private ResponseResult(ResponseResultCode resultCode, T data) {
        this.code = resultCode.getCode();
        this.message = resultCode.getMessage();
        this.data = data;
    }

    
    private ResponseResult(ResponseResultCode resultCode, Long total, T data) {
        this.code = resultCode.getCode();
        this.message = resultCode.getMessage();
        this.data = data;
        this.total = total;
    }

    
    public static ResponseResult success() {
        return success(null);
    }

    
    public static  ResponseResult success(T data) {
        return new ResponseResult(ResponseResultCode.SUCCESS, data);
    }

    
    public static  ResponseResult success(T data, Long total) {
        return new ResponseResult(ResponseResultCode.SUCCESS, total, data);
    }

    
    public static  ResponseResult failure(ResponseResultCode resultCode, T data) {
        return new ResponseResult(resultCode, data);
    }

    
    public static ResponseResult failure(ResponseResultCode resultCode) {
        return failure(resultCode, null);
    }

}

ResponseResultCode ：

package com.example.seckill.util.response;

import java.io.Serializable;

@SuppressWarnings("all")
public enum ResponseResultCode implements Serializable {

    
    SUCCESS(200, "成功"),
    FAILURE(300, "失败"),
    UNKNOWN(400, "未知错误"),
    
    USER_ACCOUNT_NOT_FIND(1001, "用户名不存在"),
    USER_ACCOUNT_DISABLED(1002, "该用户已被禁用"),
    USER_PASSWORD_NOT_MATCH(1003, "该用户密码不一致"),
    USER_PERMISSION_ERROR(1004, "该用户不具备访问权限"),
    USER_STATE_OFF_LINE(1005, "该用户未登录"),
    USER_CREDENTIAL_NOT_BE_EMPTY(1006, "用户的登录信息不能为空值"),
    USER_ACCOUNT_NOT_MOBLIE(1007, "该用户登录信息格式不符合"),
    USER_LOGIN_ERROR(1008, "登录失败"),
    
    TICKET_ERROR(4001, "TICKET失效,请重新登录"),
    
    GOODS_ADD_ERROR(6001, "商品添加失败"),
    GOODS_EDIT_ERROR(6002, "商品修改失败"),
    GOODS_REMOVE_ERROR(6003, "商品删除失败"),
    
    SECKILL_GOODS_ADD_ERROR(8001, "秒杀商品增加失败"),
    
    SECKILL_ORDER_ERROR(10001, "秒杀订单增加失败"),
    SECKILL_ORDER_QUANTITY_ERROR(10002, "秒杀商品数量不足"),
    SECKILL_ORDER_EXISTS_ERROR(10002, "秒杀订单已经存在"),
    ;

    private final Integer code;
    private final String message;

    ResponseResultCode(Integer code, String message) {
        this.code = code;
        this.message = message;
    }

    public static ResponseResultCode queryCode(Integer code) {
        for (ResponseResultCode value : values()) {
            if (code.equals(value.code)) {
                return value;
            }
        }
        return UNKNOWN;
    }

    public Integer getCode() {
        return code;
    }

    public String getMessage() {
        return message;
    }

}

RestThrowableAdvice ：

package com.example.seckill.util.response;
import com.example.seckill.exception.BusinessException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.ui.Model;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.util.Arrays;

@SuppressWarnings("all")
@RestControllerAdvice
@Slf4j
public class RestThrowableAdvice {

    @JsonResponseResult
    @ExceptionHandler(value = {BusinessException.class})
    public Object globalBusinessException(Model m, Exception e) {
        log.error(e.toString());
        return ((BusinessException) e).getResponseResultCode();
    }

    @JsonResponseResult
    @ExceptionHandler(value = {BindException.class})
    public Object globalBindException(Model m, Exception e) {
        log.error(e.toString());
        BindException error = (BindException) e;
        return Arrays
                .stream(error.getFieldError().getArguments())
                .filter(arg -> arg instanceof ResponseResultCode)
                .findAny()
                .orElse(ResponseResultCode.UNKNOWN);
    }

    @JsonResponseResult
    @ExceptionHandler(value = {Throwable.class})
    public Object globalException(Model m, Exception e) {
        log.error(e.toString());
        return ResponseResultCode.UNKNOWN;
    }

}

③、MD5Utils

package com.example.seckill.util;

import org.apache.commons.codec.digest.DigestUtils;
import org.springframework.stereotype.Component;

import java.util.UUID;


@Component
@SuppressWarnings("all")
public class MD5Utils {

    //加密盐，与前端一致
    private static String salt = "f1g2h3j4";

    
    public static String md5(String src) {
        return DigestUtils.md5Hex(src);
    }

    
    public static String createSalt() {
        return UUID.randomUUID().toString().replace("-", "");
    }

    
    public static String inputPassToFormpass(String inputPass) {
        //混淆固定盐salt,安全性更可靠
        String str = salt.charAt(1) + "" + salt.charAt(5) + inputPass + salt.charAt(0) + "" + salt.charAt(3);
        return md5(str);
    }

    
    public static String formPassToDbPass(String formPass, String salt) {
        //混淆固定盐salt,安全性更可靠
        String str = salt.charAt(7) + "" + salt.charAt(9) + formPass + salt.charAt(1) + "" + salt.charAt(5);
        return md5(str);
    }

    
    public static String inputPassToDbPass(String inputPass, String salt) {
        String formPass = inputPassToFormpass(inputPass);
        String dbPass = formPassToDbPass(formPass, salt);
        return dbPass;
    }

    public static void main(String[] args) {
        String formPass = inputPassToFormpass("123456");
        System.out.println("前端加密密码：" + formPass);
        String salt = createSalt();
        System.out.println("后端加密随机盐：" + salt);
        String dbPass = formPassToDbPass(formPass, salt);
        System.out.println("后端加密密码：" + dbPass);
        String dbPass1 = inputPassToDbPass("123456", salt);
        System.out.println("最终加密密码：" + dbPass1);
    }
}

ValidatorUtils :

package com.example.seckill.util;

import org.apache.commons.lang3.StringUtils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

@SuppressWarnings("all")
public class ValidatorUtils {

    private static final Pattern mobile_pattern = Pattern.compile("[1]([0-9])[0-9]{9}$");

    public static boolean isMobile(String mobile) {
        if (StringUtils.isEmpty(mobile)) {
            return false;
        }
        Matcher matcher = mobile_pattern.matcher(mobile);
        return matcher.matches();
    }

}

2、新建vo类

用于前后端传值：

package com.example.seckill.vo;

import lombok.Data;

@Data
public class UserVo {

//    手机号
    private String mobile;
//    密码
    private String password;

}

3、登录方法： IUserService层：

package com.example.seckill.service;

import com.example.seckill.pojo.User;
import com.baomidou.mybatisplus.extension.service.IService;
import com.example.seckill.util.response.ResponseResult;
import com.example.seckill.vo.UserVo;


public interface IUserService extends IService {

    ResponseResult findByAccount(UserVo userVo);
}

UserServiceImpl类：

package com.example.seckill.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.seckill.pojo.User;
import com.example.seckill.mapper.UserMapper;
import com.example.seckill.service.IUserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.seckill.util.ValidatorUtils;
import com.example.seckill.util.response.ResponseResult;
import com.example.seckill.util.response.ResponseResultCode;
import com.example.seckill.vo.UserVo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;


@Service
public class UserServiceImpl extends ServiceImpl implements IUserService {

    @Override
    public ResponseResult findByAccount(UserVo userVo) {
//        先判断信息是否符合（账号是否是手机号码，密码是不是空）
         if(!ValidatorUtils.isMobile(userVo.getMobile())){
             return ResponseResult.failure(ResponseResultCode.USER_ACCOUNT_NOT_MOBLIE);
         }
         if(!StringUtils.isBlank(userVo.getPassword())){
             return ResponseResult.failure(ResponseResultCode.USER_PASSWORD_NOT_MATCH);
         }
//         再去数据库查出对应的用户（mobile）
        User user=this.getOne(new QueryWrapper().eq("id",userVo.getMobile()));
        if(user==null){
            return ResponseResult.failure(ResponseResultCode.USER_ACCOUNT_NOT_FIND);
        }
//        比较密码
        if(userVo.getPassword().equals(user.getPassword())){
            return ResponseResult.failure(ResponseResultCode.USER_PASSWORD_NOT_MATCH);
        }
        return ResponseResult.success();
    }
}

UserController类：

package com.example.seckill.controller;

import com.example.seckill.service.IUserService;
import com.example.seckill.util.response.ResponseResult;
import com.example.seckill.vo.UserVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private IUserService userService;

//    用户登录
    @RequestMapping("/login")
 public ResponseResult login(UserVo userVo){
//     调用service的登录验证
     return userService.findByAccount(userVo);
 }

}

4、密码加密 ①、将md5.js放到js文件中 ②、前端密码进行加密

layui.use(["jquery","layer"],()=>{
    // 得到layui中封装的jquery
    let $=layui.jquery
    let layer=layui.layer
    // 给登录按钮设置事件
    $(login).click(()=>{
     // 取到表单的值
    let mobile = $("#mobile").val();
    let password=$("#password").val();
    // 前端加密的盐
    let salt= "f1g2h3j4";
    if(password){
        // 将密码和盐混在一起
        password=salt.charAt(1) + "" + salt.charAt(5) + password + salt.charAt(0) + "" + salt.charAt(3);
        // 进行MD5加密
        password=md5(password)
    }
    console.log(password)
    // 将数据给后台（前后端分离axios,普通开发ajax）
       $.ajax({
           url:"/user/login",//后台登录接口
           data:{
             // 需要携带的数据
               mobile,
               password
           },
           datatype: "json",//后端给你的数据类型
           success(e){
               // 成功的回调函数
            layer.msg(e.message,{icon: 6});
           },
           error(e){
               // 报错的回调函数

           }

       })
    })


})

UserServiceImpl文件：

package com.example.seckill.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.seckill.pojo.User;
import com.example.seckill.mapper.UserMapper;
import com.example.seckill.service.IUserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.seckill.util.MD5Utils;
import com.example.seckill.util.ValidatorUtils;
import com.example.seckill.util.response.ResponseResult;
import com.example.seckill.util.response.ResponseResultCode;
import com.example.seckill.vo.UserVo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;


@Service
public class UserServiceImpl extends ServiceImpl implements IUserService {

    @Override
    public ResponseResult findByAccount(UserVo userVo) {
//        先判断信息是否符合（账号是否是手机号码，密码是不是空）
         if(!ValidatorUtils.isMobile(userVo.getMobile())){
             return ResponseResult.failure(ResponseResultCode.USER_ACCOUNT_NOT_MOBLIE);
         }
         if(StringUtils.isBlank(userVo.getPassword())){
             return ResponseResult.failure(ResponseResultCode.USER_PASSWORD_NOT_MATCH);
         }
//         再去数据库查出对应的用户（mobile）
        User user=this.getOne(new QueryWrapper().eq("id",userVo.getMobile()));
        if(user==null){
            return ResponseResult.failure(ResponseResultCode.USER_ACCOUNT_NOT_FIND);
        }
//        比较密码
//        二重加密（前端->后端，后端->数据库）
        String salt=user.getSalt();
//        将前台的加密密码和后端的盐再次进行加密
        String newPassword=MD5Utils.formPassToDbPass(userVo.getPassword(),salt);
        if(!newPassword.equals(user.getPassword())){
            return ResponseResult.failure(ResponseResultCode.USER_PASSWORD_NOT_MATCH);
        }
        return ResponseResult.success();
    }
}

得到密钥，登录成功：

四、全局异常抓获 1、给实体类userVo加入注解

package com.example.seckill.vo;

import com.example.seckill.util.response.ResponseResultCode;
import com.example.seckill.util.validate.IsMobile;
import com.example.seckill.util.validate.IsRequired;
import lombok.Data;

import javax.validation.constraints.NotEmpty;

@Data
public class UserVo {

//    手机号
    @IsMobile(code = ResponseResultCode.USER_ACCOUNT_NOT_FIND)
    private String mobile;
//    密码
    @IsRequired(code = ResponseResultCode.USER_CREDENTIAL_NOT_BE_EMPTY)
    private String password;


}

2、导入帮助包validate，异常抓获 IsMobile：

package com.example.seckill.util.validate;


import com.example.seckill.util.response.ResponseResultCode;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;

@SuppressWarnings("all")
@documented
@Constraint(
//        告知使用哪个解析器
        validatedBy = {IsMobilevalidator.class}
)
@Target({ElementType.FIELD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface IsMobile {

    ResponseResultCode code() default ResponseResultCode.UNKNOWN;
     String message() default "";

    Class[] groups() default {};

    Class[] payload() default {};

}

IsMobilevalidator：

package com.example.seckill.util.validate;


import com.example.seckill.util.ValidatorUtils;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

//IsMobile的解析类
public class IsMobilevalidator implements ConstraintValidator {

    @Override
    public boolean isValid(String mobile, ConstraintValidatorContext context) {
//       调用帮助类判断格式是否正确
        return ValidatorUtils.isMobile(mobile);
    }

}

IsRequired：

package com.example.seckill.util.validate;

import com.example.seckill.util.response.ResponseResultCode;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;

@SuppressWarnings("all")
@documented
@Constraint(
//        告知使用哪个解析器
        validatedBy = {IsRequiredValidator.class}
)
@Target({ElementType.FIELD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface IsRequired {

    ResponseResultCode code() default ResponseResultCode.UNKNOWN;

    String message() default "";

    Class[] groups() default {};

    Class[] payload() default {};

}

IsRequiredValidator：

package com.example.seckill.util.validate;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;


@Slf4j
public class IsRequiredValidator implements ConstraintValidator {

    @Override
    public boolean isValid(String str, ConstraintValidatorContext context) {
        return StringUtils.isNotBlank(str);
    }

}

ThrowableAdvice：

package com.example.seckill.util.response;
import com.example.seckill.exception.BusinessException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.ui.Model;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;



//RestController的增强类
@RestControllerAdvice
@Slf4j
//抓取异常
public class ThrowableAdvice {

//    第一种方法
//    将你的结果直接封装为ResponseResult
    @JsonResponseResult
//    抓捕一个异常
    @ExceptionHandler(value = {BusinessException.class})
    public ResponseResultCode globalBusinessException(Model m, Exception e) {
        log.error(e.toString());
        e.printStackTrace();
        return ((BusinessException) e).getResponseResultCode();
    }
//    第二种方法
//@JsonResponseResult
//@ExceptionHandler(value = {BusinessException.class})
//public Object globalBusinessException(Model m, Exception e) {
//    Object[] arguments=((BindException)e).getFieldError().getArguments();
//   找到该注解上的响应码并且返回
//    return Arrays.stream(arguments)
//            .filter(t->t instanceof ResponseResultCode)
//            .findAny()
//            .orElse(ResponseResultCode.UNKNOWN);
//}
    @JsonResponseResult
    @ExceptionHandler(value = {BindException.class})
    public ResponseResultCode globalBindException(Model m, Exception e) {
        log.error(e.toString());
        BindException error = (BindException) e;
        e.printStackTrace();
        return (ResponseResultCode) error.getFieldError().getArguments()[1];
    }

    @JsonResponseResult
    @ExceptionHandler(value = {Throwable.class})
    public ResponseResultCode globalException(Model m, Exception e) {
        log.error(e.toString());
        e.printStackTrace();
        return ResponseResultCode.UNKNOWN;
    }

}

3、在UserController类方法中加入注解

开启jsr303验证

@Valid

4、实现类抛出异常

package com.example.seckill.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.example.seckill.exception.BusinessException;
import com.example.seckill.pojo.User;
import com.example.seckill.mapper.UserMapper;
import com.example.seckill.service.IUserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.seckill.util.MD5Utils;
import com.example.seckill.util.ValidatorUtils;
import com.example.seckill.util.response.ResponseResult;
import com.example.seckill.util.response.ResponseResultCode;
import com.example.seckill.vo.UserVo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;

import java.util.Date;


@Service
public class UserServiceImpl extends ServiceImpl implements IUserService {

    @Override
    public ResponseResult findByAccount(UserVo userVo) {
//        先判断信息是否符合（账号是否是手机号码，密码是不是空）

// 由于UserVo加入了注解，就无需抛出异常

//         if(!ValidatorUtils.isMobile(userVo.getMobile())){
//             throw new BusinessException(ResponseResultCode.USER_ACCOUNT_NOT_MOBLIE);
//         }
//         if(StringUtils.isBlank(userVo.getPassword())){
//             throw new BusinessException(ResponseResultCode.USER_PASSWORD_NOT_MATCH);
//         }

//         再去数据库查出对应的用户（mobile）
        User user=this.getOne(new QueryWrapper().eq("id",userVo.getMobile()));
        if(user==null){
            throw new BusinessException(ResponseResultCode.USER_ACCOUNT_NOT_FIND);
        }
//        比较密码
//        二重加密（前端->后端，后端->数据库）
        String salt=user.getSalt();
//        将前台的加密密码和后端的盐再次进行加密
        String newPassword=MD5Utils.formPassToDbPass(userVo.getPassword(),salt);
        if(!newPassword.equals(user.getPassword())){
            throw new BusinessException(ResponseResultCode.USER_PASSWORD_NOT_MATCH);
        }
//        修改最后的登录时间
        this.update(new UpdateWrapper().eq("id",userVo.getMobile()).set("last_login_date",new Date()).setSql("login_count=login_count+1"));
        return ResponseResult.success();
    }
}

密码错误时不会报错：

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