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用户登录模块技术要点：
- 密码通过MD5加密传输
- 分布式session存储用户登录信息
- 自定义注解进行字段校验
- 自定义拦截器完成登录验证
下面依次给出代码和详细解释：
1.使用 MD5 二次加密用户登录信息，前端先通过密码加上盐进行MD5加密交给服务器，在userSeverice验证时再对此密码加盐进行一次MD5加密才和数据库中查询的密码对比；
登录页面前端代码：
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>登录</title> <!-- jquery --> <script type="text/javascript" th:src="@{/js/jquery.min.js}"></script> <!-- bootstrap --> <link rel="stylesheet" type="text/css" th:href="@{/bootstrap/css/bootstrap.min.css}"/> <script type="text/javascript" th:src="@{/bootstrap/js/bootstrap.min.js}"></script> <!-- jquery-validator --> <script type="text/javascript" th:src="@{/jquery-validation/jquery.validate.min.js}"></script> <script type="text/javascript" th:src="@{/jquery-validation/localization/messages_zh.min.js}"></script> <!-- layer --> <script type="text/javascript" th:src="@{/layer/layer.js}"></script> <!-- md5.js --> <script type="text/javascript" th:src="@{/js/md5.min.js}"></script> <!-- common.js --> <script type="text/javascript" th:src="@{/js/common.js}"></script> </head> <body> <form name="loginForm" id="loginForm" method="post" style="width:50%; margin:0 auto"> <h2 style="text-align:center; margin-bottom: 20px">用户登录</h2> <div class="form-group"> <div class="row"> <label class="form-label col-md-4">请输入手机号码</label> <div class="col-md-5"> <input id="mobile" name="mobile" class="form-control" type="text" placeholder="手机号码" required="true" /> <!-- 取消位数限制 minlength="11" maxlength="11"--> </div> <div class="col-md-1"> </div> </div> </div> <div class="form-group"> <div class="row"> <label class="form-label col-md-4">请输入密码</label> <div class="col-md-5"> <input id="password" name="password" class="form-control" type="password" placeholder="密码" required="true" /> <!-- 取消位数限制 minlength="6" maxlength="16"--> </div> </div> </div> <div class="row"> <div class="col-md-5"> <button class="btn btn-primary btn-block" type="reset" onclick="reset()">重置</button> </div> <div class="col-md-5"> <button class="btn btn-primary btn-block" type="submit" onclick="login()">登录</button> </div> </div> </form> </body> <script> function login() { $("#loginForm").validate({ submitHandler: function (form) { doLogin(); } }); } function doLogin() { g_showLoading(); var inputPass = $("#password").val(); var salt = g_passsword_salt; var str = "" + salt.charAt(0) + salt.charAt(2) + inputPass + salt.charAt(5) + salt.charAt(4); var password = md5(str); $.ajax({ url: "/login/doLogin", type: "POST", data: { mobile: $("#mobile").val(), password: password }, success: function (data) { layer.closeAll(); if (data.code == 200) { layer.msg("成功"); console.log(data); document.cookie = "userTicket=" + data.object; window.location.href = "/goods/toList"; } else { layer.msg(data.message); } }, error: function () { layer.closeAll(); } }); } </script> </html> validate的JS代码：
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a,b,c;for(a=0;this.errorList[a];a++)c=this.errorList[a],this.settings.highlight&&this.settings.highlight.call(this,c.element,this.settings.errorClass,this.settings.validClass),this.showLabel(c.element,c.message);if(this.errorList.length&&(this.toShow=this.toShow.add(this.containers)),this.settings.success)for(a=0;this.successList[a];a++)this.showLabel(this.successList[a]);if(this.settings.unhighlight)for(a=0,b=this.validElements();b[a];a++)this.settings.unhighlight.call(this,b[a],this.settings.errorClass,this.settings.validClass);this.toHide=this.toHide.not(this.toShow),this.hideErrors(),this.addWrapper(this.toShow).show()},validElements:function(){return this.currentElements.not(this.invalidElements())},invalidElements:function(){return a(this.errorList).map(function(){return this.element})},showLabel:function(b,c){var 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a.data(b,"previousValue")||a.data(b,"previousValue",{old:null,valid:!0,message:this.defaultMessage(b,"remote")})},destroy:function(){this.resetForm(),a(this.currentForm).off(".validate").removeData("validator")}},classRuleSettings:{required:{required:!0},email:{email:!0},url:{url:!0},date:{date:!0},dateISO:{dateISO:!0},number:{number:!0},digits:{digits:!0},creditcard:{creditcard:!0}},addClassRules:function(b,c){b.constructor===String?this.classRuleSettings[b]=c:a.extend(this.classRuleSettings,b)},classRules:function(b){var c={},d=a(b).attr("class");return d&&a.each(d.split(" "),function(){this in a.validator.classRuleSettings&&a.extend(c,a.validator.classRuleSettings[this])}),c},normalizeAttributeRule:function(a,b,c,d){/min|max/.test(c)&&(null===b||/number|range|text/.test(b))&&(d=Number(d),isNaN(d)&&(d=void 0)),d||0===d?a[c]=d:b===c&&"range"!==b&&(a[c]=!0)},attributeRules:function(b){var c,d,e={},f=a(b),g=b.getAttribute("type");for(c in a.validator.methods)"required"===c?(d=b.getAttribute(c),""===d&&(d=!0),d=!!d):d=f.attr(c),this.normalizeAttributeRule(e,g,c,d);return e.maxlength&&/-1|2147483647|524288/.test(e.maxlength)&&delete e.maxlength,e},dataRules:function(b){var c,d,e={},f=a(b),g=b.getAttribute("type");for(c in a.validator.methods)d=f.data("rule"+c.charAt(0).toUpperCase()+c.substring(1).toLowerCase()),this.normalizeAttributeRule(e,g,c,d);return e},staticRules:function(b){var c={},d=a.data(b.form,"validator");return d.settings.rules&&(c=a.validator.normalizeRule(d.settings.rules[b.name])||{}),c},normalizeRules:function(b,c){return a.each(b,function(d,e){if(e===!1)return void delete b[d];if(e.param||e.depends){var f=!0;switch(typeof e.depends){case"string":f=!!a(e.depends,c.form).length;break;case"function":f=e.depends.call(c,c)}f?b[d]=void 0!==e.param?e.param:!0:delete b[d]}}),a.each(b,function(d,e){b[d]=a.isFunction(e)?e(c):e}),a.each(["minlength","maxlength"],function(){b[this]&&(b[this]=Number(b[this]))}),a.each(["rangelength","range"],function(){var c;b[this]&&(a.isArray(b[this])?b[this]=[Number(b[this][0]),Number(b[this][1])]:"string"==typeof b[this]&&(c=b[this].replace(/[\[\]]/g,"").split(/[\s,]+/),b[this]=[Number(c[0]),Number(c[1])]))}),a.validator.autoCreateRanges&&(null!=b.min&&null!=b.max&&(b.range=[b.min,b.max],delete b.min,delete b.max),null!=b.minlength&&null!=b.maxlength&&(b.rangelength=[b.minlength,b.maxlength],delete b.minlength,delete b.maxlength)),b},normalizeRule:function(b){if("string"==typeof b){var c={};a.each(b.split(/\s/),function(){c[this]=!0}),b=c}return b},addMethod:function(b,c,d){a.validator.methods[b]=c,a.validator.messages[b]=void 0!==d?d:a.validator.messages[b],c.length<3&&a.validator.addClassRules(b,a.validator.normalizeRule(b))},methods:{required:function(b,c,d){if(!this.depend(d,c))return"dependency-mismatch";if("select"===c.nodeName.toLowerCase()){var e=a(c).val();return e&&e.length>0}return this.checkable(c)?this.getLength(b,c)>0:b.length>0},email:function(a,b){return this.optional(b)||/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/.test(a)},url:function(a,b){return this.optional(b)||/^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})).?)(?::\d{2,5})?(?:[/?#]\S*)?$/i.test(a)},date:function(a,b){return this.optional(b)||!/Invalid|NaN/.test(new Date(a).toString())},dateISO:function(a,b){return this.optional(b)||/^\d{4}[\/\-](0?[1-9]|1[012])[\/\-](0?[1-9]|[12][0-9]|3[01])$/.test(a)},number:function(a,b){return this.optional(b)||/^(?:-?\d+|-?\d{1,3}(?:,\d{3})+)?(?:\.\d+)?$/.test(a)},digits:function(a,b){return this.optional(b)||/^\d+$/.test(a)},creditcard:function(a,b){if(this.optional(b))return"dependency-mismatch";if(/[^0-9 \-]+/.test(a))return!1;var c,d,e=0,f=0,g=!1;if(a=a.replace(/\D/g,""),a.length<13||a.length>19)return!1;for(c=a.length-1;c>=0;c--)d=a.charAt(c),f=parseInt(d,10),g&&(f*=2)>9&&(f-=9),e+=f,g=!g;return e%10===0},minlength:function(b,c,d){var e=a.isArray(b)?b.length:this.getLength(b,c);return this.optional(c)||e>=d},maxlength:function(b,c,d){var e=a.isArray(b)?b.length:this.getLength(b,c);return this.optional(c)||d>=e},rangelength:function(b,c,d){var e=a.isArray(b)?b.length:this.getLength(b,c);return this.optional(c)||e>=d[0]&&e<=d[1]},min:function(a,b,c){return this.optional(b)||a>=c},max:function(a,b,c){return this.optional(b)||c>=a},range:function(a,b,c){return this.optional(b)||a>=c[0]&&a<=c[1]},equalTo:function(b,c,d){var e=a(d);return this.settings.onfocusout&&e.off(".validate-equalTo").on("blur.validate-equalTo",function(){a(c).valid()}),b===e.val()},remote:function(b,c,d){if(this.optional(c))return"dependency-mismatch";var e,f,g=this.previousValue(c);return this.settings.messages[c.name]||(this.settings.messages[c.name]={}),g.originalMessage=this.settings.messages[c.name].remote,this.settings.messages[c.name].remote=g.message,d="string"==typeof d&&{url:d}||d,g.old===b?g.valid:(g.old=b,e=this,this.startRequest(c),f={},f[c.name]=b,a.ajax(a.extend(!0,{mode:"abort",port:"validate"+c.name,dataType:"json",data:f,context:e.currentForm,success:function(d){var f,h,i,j=d===!0||"true"===d;e.settings.messages[c.name].remote=g.originalMessage,j?(i=e.formSubmitted,e.prepareElement(c),e.formSubmitted=i,e.successList.push(c),delete e.invalid[c.name],e.showErrors()):(f={},h=d||e.defaultMessage(c,"remote"),f[c.name]=g.message=a.isFunction(h)?h(b):h,e.invalid[c.name]=!0,e.showErrors(f)),g.valid=j,e.stopRequest(c,j)}},d)),"pending")}}});var b,c={};a.ajaxPrefilter?a.ajaxPrefilter(function(a,b,d){var e=a.port;"abort"===a.mode&&(c[e]&&c[e].abort(),c[e]=d)}):(b=a.ajax,a.ajax=function(d){var e=("mode"in d?d:a.ajaxSettings).mode,f=("port"in d?d:a.ajaxSettings).port;return"abort"===e?(c[f]&&c[f].abort(),c[f]=b.apply(this,arguments),c[f]):b.apply(this,arguments)})}); 服务端登录controller代码：
package com.example.seckilldemo.controller; import com.example.seckilldemo.service.UserService; import com.example.seckilldemo.vo.LoginVo; import com.example.seckilldemo.vo.RespBean; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.validation.Valid; /** * @Author wuyifan * @Date 2024/4/22 16:03 * @Version 1.0 */ @Controller @RequestMapping("/login") @Slf4j public class LoginController { @Autowired private UserService userService; @RequestMapping("/toLogin") public String toLogin(){ return "login"; } /* RequestMapping注解用于将HTTP请求映射到该方法上。 当客户端发送一个URL为"/doLogin"的请求时Spring将调用这个方法来处理请求。*/ @RequestMapping("/doLogin") /* @ResponseBody：这个注解表示该方法的返回值将直接作为HTTP响应的内容， 而不是通过视图解析器进行渲染。通常用于返回JSON数据或其他格式的数据。*/ @ResponseBody /* 通过在LoginVo类的属性上添加校验规则注解（如@NotBlank、@Size等），可以对该对象的属性进行验证。 当使用@Valid注解标记一个对象参数时，Spring会自动触发验证过程，检查该对象的属性是否满足校验规则。*/ public RespBean doLogin(@Valid LoginVo loginVo, HttpServletRequest request,HttpServletResponse response){ return userService.doLogin(loginVo, request, response); } } 登录验证的service代码： 随机生成一个uuid作为key，将用户登陆信息使用Redis存储，将key作为cookie返回。
package com.example.seckilldemo.service.impl; import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl; import com.example.seckilldemo.exception.GlobalException; import com.example.seckilldemo.mapper.UserMapper; import com.example.seckilldemo.pojo.User; import com.example.seckilldemo.service.UserService; import com.example.seckilldemo.utils.*; import com.example.seckilldemo.vo.LoginVo; import com.example.seckilldemo.vo.RespBean; import com.example.seckilldemo.vo.RespBeanEnum; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.stereotype.Service; import org.thymeleaf.util.StringUtils; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * @Author wuyifan * @Date 2024/4/22 15:57 * @Version 1.0 */ @Service public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService { @Autowired private UserMapper userMapper; @Autowired private RedisTemplate<String,Object> redisTemplate; @Override public RespBean doLogin(LoginVo loginVo, HttpServletRequest request, HttpServletResponse response) { String mobile = loginVo.getMobile(); String password = loginVo.getPassword(); //使用自定义注解完成字段检验 // if (StringUtils.isEmpty(mobile) || StringUtils.isEmpty(password)) { // return RespBean.error(RespBeanEnum.LOGIN_ERROR); // } // if(!ValidatorUtil.isMobile(mobile)){ // return RespBean.error(RespBeanEnum.MOBILE_ERROR); // } User user = userMapper.selectById(mobile); if(null == user){ log.error("查詢失敗"); // return RespBean.error(RespBeanEnum.LOGIN_ERROR); throw new GlobalException(RespBeanEnum.LOGIN_ERROR); } if(!MD5Util.formPassToDBPass(password,user.getSalt()).equals(user.getPassword())){ // return RespBean.error(RespBeanEnum.LOGIN_ERROR); throw new GlobalException(RespBeanEnum.LOGIN_ERROR); } //生成cookie String ticket = UUIDUtil.uuid(); //将用户信息存入Redis中 redisTemplate.opsForValue().set("user:"+ticket,user); // request.getSession().setAttribute(ticket,user); CookieUtil.setCookie(request,response,"userTicket",ticket); // System.out.println(CookieUtil.getCookieValue(request, "userTicket")); return RespBean.success(ticket); } @Override public RespBean updatePassword(String userTicket, String pwd, HttpServletResponse response, HttpServletRequest request) { User user = getUserByCookie(userTicket,request,response); if(user == null) throw new GlobalException(RespBeanEnum.MOBILE_NOT_EXIST); user.setPassword(MD5Util.inputPassToDBPass(pwd,user.getSalt())); int result = userMapper.updateById(user); if(1 == result){ redisTemplate.delete("user:"+userTicket); return RespBean.success(); } return RespBean.error(RespBeanEnum.PASSWORD_UPDATE_FAIL); } @Override public User getUserByCookie(String userTicket, HttpServletRequest request, HttpServletResponse response) { if(StringUtils.isEmpty(userTicket)) return null; User user = (User) redisTemplate.opsForValue().get("user:"+userTicket); if(user != null){ CookieUtil.setCookie(request,response,"userTicket",userTicket); } return user; } } 实现自定义拦截器方法：实现WebMvcConfigurer 接口，使得springMVC调用服务接口时进行用户身份解析
package com.example.seckilldemo.config; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.web.method.support.HandlerMethodArgumentResolver; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; import java.util.List; /** * @Author wuyifan * @Date 2024/4/24 12:01 * @Version 1.0 */ @Configuration //这个注解启用了Spring MVC的功能，用于处理Web请求和响应。 @EnableWebMvc public class WebConfig implements WebMvcConfigurer { //UserArgumentResolver是一个自定义的参数解析器，用于解析请求中的用户信息。 @Autowired UserArgumentResolver userArgumentResolver; @Autowired private AccessLimitInterceptor accessLimitInterceptor; // 这个方法是WebMvcConfigurer接口的一个回调方法，用于添加自定义的参数解析器。 // 将userArgumentResolver添加到参数解析器列表中，以便在处理请求时使用该解析器解析用户信息。 @Override public void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) { resolvers.add(userArgumentResolver); } /* 这个方法是WebMvcConfigurer接口的一个回调方法，用于添加拦截器。 将accessLimitInterceptor添加到拦截器列表中，以便在请求处理之前进行接口限流的拦截。*/ @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(accessLimitInterceptor); } //静态资源展示 @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/**").addResourceLocations("classpath:/static/"); //swagger 和 knife4j registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/"); registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/"); registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/"); } } 两种方法获取用户登录信息，一种是通过获取Redis里存储的用户信息；另一种是使用ThreadLocal获取用户信息(后面使用接口限流会给出方法)。
package com.example.seckilldemo.config; import com.example.seckilldemo.pojo.User; import com.example.seckilldemo.service.UserService; import com.example.seckilldemo.utils.CookieUtil; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.core.MethodParameter; import org.springframework.stereotype.Component; import org.springframework.util.StringUtils; import org.springframework.web.bind.support.WebDataBinderFactory; import org.springframework.web.context.request.NativeWebRequest; import org.springframework.web.method.support.HandlerMethodArgumentResolver; import org.springframework.web.method.support.ModelAndViewContainer; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * @Author wuyifan * @Date 2024/4/24 12:05 * @Version 1.0 */ @Component public class UserArgumentResolver implements HandlerMethodArgumentResolver { @Autowired private UserService userService; @Override public boolean supportsParameter(MethodParameter parameter) { Class<?> parameterType = parameter.getParameterType(); return parameterType == User.class; } @Override public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception { HttpServletRequest nativeRequest = webRequest.getNativeRequest(HttpServletRequest.class); HttpServletResponse nativeResponse = webRequest.getNativeResponse(HttpServletResponse.class); String userTicket = CookieUtil.getCookieValue(nativeRequest, "userTicket"); System.out.println("userTicket"+userTicket); if (StringUtils.isEmpty(userTicket)) { return null; } return userService.getUserByCookie(userTicket,nativeRequest,nativeResponse); } } 