七、Springmvc攔截器
阿新 • • 發佈：2018-11-06
springmvc.xml
<!-- Springmvc的攔截器 --> <mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <!-- 自定義的攔截器類 --> <bean class="com.itheima.springmvc.interceptor.Interceptor1"/> </mvc:interceptor> <!-- <mvc:interceptor> <mvc:mapping path="/**"/> 自定義的攔截器類 <bean class="com.itheima.springmvc.interceptor.Interceptor2"/> </mvc:interceptor> --> </mvc:interceptors>
Interceptor1
package com.itheima.springmvc.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class Interceptor1 implements HandlerInterceptor{
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
System.out.println("方法前1");
//判斷使用者是否登入 如果沒登入，重定向到登入頁面，不放行 如果登陸了，就放行
//URL http://localhost:8080/springmvc-mybatis/login.jsp
//URI /login.jsp
String requestURI = request.getRequestURI();
if(!requestURI.contains("/login")){
String username = (String) request.getSession().getAttribute("USER_SESSION");
if(null == username){
response.sendRedirect(request.getContextPath()+"/login.action");
return false;
}
}
return true;
}
@Override
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
throws Exception {
System.out.println("方法後1");
}
@Override
public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
throws Exception {
System.out.println("頁面渲染後1");
}
}
ItemController
@Controller
public class ItemController {
@Autowired
private ItemService itemService;
//去登入的頁面
@RequestMapping(value = "/login.action",method=RequestMethod.GET)
public String login(){
return "login";
}
@RequestMapping(value="/login.action",method=RequestMethod.POST)
public String login(String username,HttpSession session){
session.setAttribute("USER_SESSION", username);
return "redirect:item/itemList.action";
}
}
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/login.action" method="post">
使用者名稱：<input type="text" name="username" value="dfaadfd">
<input type="submit" value="提交">
</form>
</body>
</html>