[] SpringMVC logged verification

Directory Structure

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Explanation

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使用springmvc拦截器实现登陆验证

1. 把页面放入到web-inf中.
	1.1 放入到web-inf中后必须通过控制器转发到页面.
	1.2 springmvc拦截器拦截的是控制器,不能拦截jsp
	
2. 通过拦截器拦截全部控制器,需要在拦截器内部放行login控制器

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee                       
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
	<!-- 配置前端控制器 -->
	<servlet>
		<servlet-name>jqk</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:springmvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>jqk</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	
	<!-- 字符编码过滤器 -->
	<filter>
		<filter-name>encoding</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>utf-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encoding</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
</web-app>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!-- 扫描注解 -->
	<context:component-scan base-package="com.bjsxt.controller"></context:component-scan>
	<!-- 注解驱动 -->
	<!-- org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping -->
	<!-- org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter -->
	<mvc:annotation-driven></mvc:annotation-driven>
	<!-- 静态资源 -->
	<mvc:resources location="/js/" mapping="/js/**"></mvc:resources>
	<mvc:resources location="/css/" mapping="/css/**"></mvc:resources>
	<mvc:resources location="/images/" mapping="/images/**"></mvc:resources>
	<mvc:resources location="/files/" mapping="/files/**"></mvc:resources>
	
	<!-- 视图解析器 -->
	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/page/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
	<!-- 配置拦截器 -->
	<mvc:interceptors>
		<bean class="com.bjsxt.interceptor.LoginInterceptor"></bean>
	</mvc:interceptors>
</beans>

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="login" method="post">
	用户名:<input type="text" name="username"/><br/>
	密码:<input type="password" name="password"/><br/>
	<input type="submit" value="登录"/>
</form>
</body>
</html>

DemoController.java

package com.bjsxt.controller;

import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import com.bjsxt.pojo.Users;

@Controller
public class DemoController {
	@RequestMapping("{page}")
	public String main(@PathVariable String page){
		System.out.println("restful");
		return page;
	}
	@RequestMapping("login")
	public String login(Users users,HttpSession session){
		if(users.getUsername().equals("admin")&&users.getPassword().equals("123")){
			session.setAttribute("users", users);
			return "main";
		}else{
			return "redirect:/login.jsp";
		}
	}
}

LoginInterceptor.java

package com.bjsxt.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 LoginInterceptor implements HandlerInterceptor {

	@Override
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object arg2) throws Exception {
		String uri = req.getRequestURI();
		if(uri.equals("/springmvc03/login")){
			return true;
		}else{
			Object obj = req.getSession().getAttribute("users");
			if(obj!=null){
				return true;
			}
			res.sendRedirect("/springmvc03/login.jsp");
			return false;
		}
	}
}

Users.java

package com.bjsxt.pojo;

public class Users {
	private int id;
	private String username;
	private String password;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

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[] SpringMVC logged verification

Directory Structure

Explanation

web.xml

springmvc.xml

login.jsp

DemoController.java

LoginInterceptor.java

Users.java

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