SpringMVC自定义拦截器登录检测功能的实现代码
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2022-03-23 09:20:48
目录一、定义登录控制器目录结构代码:1、创建tuser类package com.demo.pojo;import lombok.allargsconstructor;import lombok.dat...
一、定义登录控制器
目录结构
代码:
1、创建tuser类
package com.demo.pojo; import lombok.allargsconstructor; import lombok.data; import lombok.noargsconstructor; @data @allargsconstructor @noargsconstructor public class tuser { private string name; private string password; }
2、创建logincontroller类
package com.demo.controller; import com.demo.pojo.tuser; import com.demo.pojo.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 org.springframework.web.bind.annotation.requestparam; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import javax.servlet.http.httpsession; @controller @requestmapping("/user") public class logincontroller { @requestmapping("/login") public string login(model model){ model.addattribute("msg","这里是登陆界面"); return "login"; } @requestmapping("/dologin") public string dologin(tuser tuser, httpservletrequest req, httpservletresponse resp, model model){ system.out.println("###logincontroller.dologin()"); if(!"admin".equals(tuser.getname())||!"admin".equals(tuser.getpassword())){ model.addattribute("msg","用户名或密码不正确!"); return "loginfail";//跳转到loginfail.jsp } httpsession httpsession=req.getsession(true);//存在session则使用,不存在则创建 httpsession.setattribute("user",tuser); model.addattribute("msg","登录成功"); return "success";//跳转到success.jsp } @requestmapping("/loginout") public string loginfail(httpsession session,model model){ model.addattribute("msg","退出登录"); session.removeattribute("user"); return "login"; } }
页面代码:
1、login.jsp
<%@ page contenttype="text/html;charset=utf-8" language="java" %> <html> <head> <title>login</title> </head> <body> <h1>${msg}</h1> <form id="login" action="${pagecontext.request.contextpath}/user/dologin" method="post"> 用户名:<input type="text" name="name"/><br/> 密码:<input type="password" name="password"><br/> <input type="submit"> </form> </body> </html>
2、loginfail.jsp
<%@ page contenttype="text/html;charset=utf-8" language="java" %> <html> <head> <title>loginfail</title> </head> <body> <h1>${msg}</h1> <h2><a href="${pagecontext.request.contextpath}/user/loginout" rel="external nofollow" rel="external nofollow" >返回登录界面</a></h2> </body> </html>
3、success.jsp
<%@ page contenttype="text/html;charset=utf-8" language="java" %> <html> <head> <title>success</title> </head> <body> ${msg} <h2><a href="${pagecontext.request.contextpath}/user/loginout" rel="external nofollow" rel="external nofollow" >退出登录</a></h2> </body> </html>
二、自定义登录拦截器
代码:
1、创建logininterceptor类,作为拦截器类需实现handlerinterceptor,并重写里面的三个方法prehandle、posthandle、aftercompletion:
package com.demo.interceptor; import org.springframework.web.servlet.handlerinterceptor; import org.springframework.web.servlet.modelandview; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; public class logininterceptor implements handlerinterceptor { @override public boolean prehandle(httpservletrequest request, httpservletresponse response, object handler) throws exception { system.out.println("logininterceptor prehandle"); //放行:判断什么情况下 //1、请求到登陆界面放行,首次登陆 if(request.getrequesturi().contains("login")||request.getrequesturi().contains("dologin")){ return true; } //2、退出登录可直接放行 if(request.getrequesturi().contains("loginout")){ return true; } //3、通过登录进入 放行 if(request.getsession().getattribute("user")!=null){ return true; } //非法请求进行拦截 //重定向到登录页面 response.sendredirect(request.getcontextpath()+"login"); //拦截 return false; } @override public void posthandle(httpservletrequest request, httpservletresponse response, object handler, modelandview modelandview) throws exception { system.out.println("logininterceptor "+"posthandle"); } @override public void aftercompletion(httpservletrequest request, httpservletresponse response, object handler, exception ex) throws exception { system.out.println("logininterceptor "+"aftercompletion"); } }
2、在spring-mvc.xml中配置logininterceptor拦截器 测试: 1、正常登录(正确密码:admin)
1.1、点击退出登录
2、用户名密码错误
2.1、点击返回登录界面
3、非法请求
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