用户登录时，将用户信息放到session中
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package cn.woniubushiniu.controller;import cn.woniubushiniu.po.user;import org.springframework.stereotype.controller;import org.springframework.ui.model;import org.springframework.web.bind.annotation.requestmapping;import org.springframework.web.bind.annotation.requestmethod;import javax.servlet.http.httpsession;@controllerpublic class usercontroller { /** * 向用户登录页面跳转 */ @requestmapping(value = "/login",method = requestmethod.get) public string tologin(){ return "login"; } /** * 用户登录 * @param user * @param model * @param session * @return */ @requestmapping(value = "/login",method = requestmethod.post) public string login(user user, model model, httpsession session){ //获取用户名和密码 string username=user.getusername(); string password=user.getpassword(); //些处横板从数据库中获取对用户名和密码后进行判断 if(username!=null&&username.equals("admin")&&password!=null&&password.equals("admin")){ //将用户对象添加到session中 session.setattribute("user_session",user); //重定向到主页面的跳转方法 return "redirect:main"; } model.addattribute("msg","用户名或密码错误，请重新登录！"); return "login"; } @requestmapping(value = "/main") public string tomain(){ return "main"; } @requestmapping(value = "/logout") public string logout(httpsession session){ //清除session session.invalidate(); //重定向到登录页面的跳转方法 return "redirect:login"; } } |
拦截未登录的用户
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public class logininterceptor implements handlerinterceptor { @override public boolean prehandle(httpservletrequest request, httpservletresponse response, object o) throws exception { //获取请求的rui:去除http:localhost:8080这部分剩下的 string uri = request.getrequesturi(); //utl:除了login.jsp是可以公开访问的，其他的url都进行拦截控制 if (uri.indexof("/login") >= 0) { return true; } //获取session httpsession session = request.getsession(); user user = (user) session.getattribute("user_session"); //判断session中是否有用户数据，如果有，则返回true，继续向下执行 if (user != null) { return true; } //不符合条件的给出提示信息，并转发到登录页面 request.setattribute("msg", "您还没有登录，请先登录！"); request.getrequestdispatcher("/web-inf/jsp/login.jsp").forward(request, response); return false; } @override public void posthandle(httpservletrequest httpservletrequest, httpservletresponse httpservletresponse, object o, modelandview modelandview) throws exception { } @override public void aftercompletion(httpservletrequest httpservletrequest, httpservletresponse httpservletresponse, object o, exception e) throws exception { }} |
配置文件
配置到spring 的配置文件中
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<!--登录拦截器--> <mvc:interceptor> <mvc:mapping path="/**"/> <bean class="cn.woniubushiniu.interceptor.logininterceptor"/> </mvc:interceptor> </mvc:interceptors> |
配置web.xml 拦截所有url,并设置需要扫描的spring文件
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<!--配置前端控制器--> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.dispatcherservlet</servlet-class> <init-param> <param-name>contextconfiglocation</param-name> <param-value>classpath:springmvc-config.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://segmentfault.com/a/1190000015642264
