超详细讲解Java秒杀项目登陆模块的实现_Java教程

一、项目前准备

1、新建项目

超详细讲解Java秒杀项目登陆模块的实现

2、导入依赖

<dependencies>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter</artifactId>
      </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-aop</artifactId>
      </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-test</artifactId>
          <scope>test</scope>
      </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-freemarker</artifactId>
      </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
      </dependency>
      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <scope>runtime</scope>
      </dependency>
      <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <optional>true</optional>
      </dependency>
      <!-- mybatis plus依赖 -->
      <dependency>
          <groupId>com.baomidou</groupId>
          <artifactId>mybatis-plus-boot-starter</artifactId>
          <version>3.5.1</version>
      </dependency>
      <!--mybatis-plus生成器-->
      <dependency>
          <groupId>com.baomidou</groupId>
          <artifactId>mybatis-plus-generator</artifactId>
          <version>3.5.2</version>
      </dependency>
      <!-- MD5依赖 -->
      <dependency>
          <groupId>commons-codec</groupId>
          <artifactId>commons-codec</artifactId>
      </dependency>
      <dependency>
          <groupId>org.apache.commons</groupId>
          <artifactId>commons-lang3</artifactId>
          <version>3.12.0</version>
      </dependency>
      <!-- valid验证依赖 -->
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-validation</artifactId>
      </dependency>
      <!--redis-->
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-data-redis</artifactId>
      </dependency>
      <!--hariki 连接池-->
      <dependency>
          <groupId>com.zaxxer</groupId>
          <artifactId>HikariCP</artifactId>
      </dependency>
      <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
      <dependency>
          <groupId>io.springfox</groupId>
          <artifactId>springfox-swagger2</artifactId>
          <version>2.9.2</version>
      </dependency>
      <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
      <dependency>
          <groupId>io.springfox</groupId>
          <artifactId>springfox-swagger-ui</artifactId>
          <version>2.9.2</version>
      </dependency>
  </dependencies>

3、执行sql脚本

得到表：

超详细讲解Java秒杀项目登陆模块的实现

首先查看登录的表数据：

超详细讲解Java秒杀项目登陆模块的实现

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/**
mybatis-plus:
mapper-locations: classpath*:/mapper/*Mapper.xml
type-aliases-package: com.example.seckill.pojo
configuration:
map-underscore-to-camel-case: true
logging:
level:
com.example.seckill.mapper: debug

由于2.4.1版本是没有templates目录，而我配置的模板的位置在此处，所以在resource内新建templates目录

超详细讲解Java秒杀项目登陆模块的实现

5、在启动类加入注解

SeckillApplication类：

//开启切面
@EnableAspectJAutoProxy
//开启事务
@EnableTransactionManagement
//扫描mapper层
@MapperScan("com.example.seckill.mapper")

6、自动生成器

package com.example.seckill.generator;

import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.generator.FastAutoGenerator;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.OutputFile;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
import com.baomidou.mybatisplus.generator.fill.Column;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

@SuppressWarnings("all")
@Slf4j
@Data
public class MybatisPlusGenerator {

  protected static String URL = "jdbc:mysql://localhost:3306/seckill?useEncoding=utf8mb4&serverTimezone=Asia/Shanghai&useSSL=false";
  protected static String USERNAME = "root";
  protected static String PASSWORD = "123456";

  protected static DataSourceConfig.Builder DATA_SOURCE_CONFIG = new DataSourceConfig.Builder(URL, USERNAME, PASSWORD);

  public static void main(String[] args) {
      FastAutoGenerator.create(DATA_SOURCE_CONFIG)
              .globalConfig(
                      (scanner/*lamdba*/, builder/*变量*/) ->
                              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<String> getTables(String tables) {
      return "all".equals(tables) ? Collections.emptyList() : Arrays.asList(tables.split(","));
  }

}

二、前端构建

1、导入layui

超详细讲解Java秒杀项目登陆模块的实现

2、将界面放到template

超详细讲解Java秒杀项目登陆模块的实现

head.ftl文件：

<meta charset="UTF-8">
<title>秒杀项目</title>
<script src="/static/asset/js/layui/layui.js" type="text/javascript"></script>
<link href="/static/asset/js/layui/css/layui.css" rel="stylesheet" type="text/css"/>
<meta http-equiv="Expires" content="0">
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Cache-control" content="no-cache">
<meta http-equiv="Cache" content="no-cache">
<#assign ctx>
  ${springMacroRequestContext.getContextPath()}
</#assign>

goodsList.ftl文件：

<!DOCTYPE html>
<html lang="en">
<head>
  <#include "../common/head.ftl">
</head>
<body>
<h1>这是商品展示界面</h1>
</body>
</html>

<!DOCTYPE html>
<html lang="zh">
<head>
  <#include "common/head.ftl"/>
  <style>
      .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;
      }
  </style>
</head>
<body>
<div>
  <div class="layui-panel layui-bg-cyan">
      <h3>用户登录</h3>
      <div class="layui-form-item">
          <label class="layui-form-label">用户账号</label>
          <div class="layui-input-block">
              <input type="text" id="mobile" autocomplete="on" class="layui-input" value="18684671234">
          </div>
      </div>
      <div class="layui-form-item">
          <label class="layui-form-label">用户密码</label>
          <div class="layui-input-block">
              <input type="password" id="password" autocomplete="on" class="layui-input" value="123456">
          </div>
      </div>
      <div class="layui-form-item" style="text-align:center;">
          <button class="layui-btn" id="login" style="width:46%">登录</button>
          <button class="layui-btn layui-btn-normal" id="register" style="width:46%">注册</button>
      </div>
  </div>
</div>
<script src="${ctx}/static/asset/js/md5.js"></script>
<script src="${ctx}/static/asset/js/project/login.js"></script>
</body>
</html>

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：

超详细讲解Java秒杀项目登陆模块的实现

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<T> implements Serializable {

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

  /**
   * 私有构造, 只允许通过static调用构造
   *
   * @param resultCode 结果枚举
   * @param data       响应数据
   */
  private ResponseResult(ResponseResultCode resultCode, T data) {
      this.code = resultCode.getCode();
      this.message = resultCode.getMessage();
      this.data = data;
  }

  /**
   * 私有构造, 只允许通过static调用构造
   *
   * @param resultCode 结果枚举
   * @param data       响应数据
   */
  private ResponseResult(ResponseResultCode resultCode, Long total, T data) {
      this.code = resultCode.getCode();
      this.message = resultCode.getMessage();
      this.data = data;
      this.total = total;
  }

  /**
   * 成功调用返回的结果(无数据携带)
   */
  public static ResponseResult success() {
      return success(null);
  }

  /**
   * 成功调用返回的结果(数据携带)
   *
   * @param data 携带的数据
   */
  public static <T> ResponseResult success(T data) {
      return new ResponseResult(ResponseResultCode.SUCCESS, data);
  }

  /**
   * 成功调用返回的结果(分页使用)
   *
   * @param data  携带的数据
   * @param total 数据总条数
   */
  public static <T> ResponseResult success(T data, Long total) {
      return new ResponseResult(ResponseResultCode.SUCCESS, total, data);
  }

  /**
   * 失败调用返回的结果(数据携带)
   *
   * @param resultCode 状态枚举
   * @param data       携带的数据
   */
  public static <T> ResponseResult failure(ResponseResultCode resultCode, T data) {
      return new ResponseResult(resultCode, data);
  }

  /**
   * 失败调用返回的结果(无数据携带)
   *
   * @param resultCode 状态枚举
   */
  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 {

  /* 正常状态 */
  SUCCESS(200, "成功"),
  FAILURE(300, "失败"),
  UNKNOWN(400, "未知错误"),
  /**
   * 用户code范围: 1000;
   */
  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"),
  /**
   * 其它异常: 4000;
   */
  TICKET_ERROR(4001, "TICKET失效,请重新登录"),
  /**
   * 商品异常: 6000;
   */
  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"),
  /**
   * 秒杀商品异常: 8000
   */
  SECKILL_GOODS_ADD_ERROR(8001, "秒杀商品增加失败"),
  /**
   * 秒杀订单异常: 10000
   */
  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;

/**
* MD5加密
* 用户端：password=MD5(明文+固定Salt)
* 服务端：password=MD5(用户输入+随机Salt)
* 用户端MD5加密是为了防止用户密码在网络中明文传输，服务端MD5加密是为了提高密码安全性，双重保险。
*/
@Component
@SuppressWarnings("all")
public class MD5Utils {

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

  /**
   * md5加密
   *
   * @param src
   * @return
   */
  public static String md5(String src) {
      return DigestUtils.md5Hex(src);
  }

  /**
   * 获取加密的盐
   *
   * @return
   */
  public static String createSalt() {
      return UUID.randomUUID().toString().replace("-", "");
  }

  /**
   * 将前端的明文密码通过MD5加密方式加密成后端服务所需密码
   * 注意：该步骤实际是在前端完成！！！
   *
   * @param inputPass 明文密码
   * @return
   */
  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);
  }

  /**
   * 将后端密文密码+随机salt生成数据库的密码
   *
   * @param formPass
   * @param salt
   * @return
   */
  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);
  }

  /**
   * 将用户输入的密码转换成数据库的密码
   *
   * @param inputPass 明文密码
   * @param salt      盐
   * @return
   */
  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;

/**
* <p>
* 用户信息表 服务类
* </p>
*
* @author lv
* @since 2022-03-15
*/
public interface IUserService extends IService<User> {

  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;

/**
* <p>
* 用户信息表 服务实现类
* </p>
*
* @author lv
* @since 2022-03-15
*/
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> 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<User>().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;

/**
* <p>
* 用户信息表 前端控制器
* </p>
*
* @author lv
* @since 2022-03-15
*/
@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;

/**
* <p>
* 用户信息表 服务实现类
* </p>
*
* @author lv
* @since 2022-03-15
*/
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> 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<User>().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：

超详细讲解Java秒杀项目登陆模块的实现

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<? extends Payload>[] 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<IsMobile, String> {

  @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<? extends Payload>[] 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<IsRequired, String> {

  @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;

/**
* 全局异常
*/

//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

超详细讲解Java秒杀项目登陆模块的实现

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;

/**
* <p>
* 用户信息表 服务实现类
* </p>
*
* @author lv
* @since 2022-03-15
*/
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> 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<User>().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<User>().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：

超详细讲解Java秒杀项目登陆模块的实现