Java学习笔记-全栈-web开发-16-SpringMVC

 <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

<?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"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
		http://www.springframework.org/schema/mvc 
		http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
		http://www.springframework.org/schema/context 
		http://www.springframework.org/schema/context/spring-context-3.2.xsd 
		http://www.springframework.org/schema/aop 
		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
		http://www.springframework.org/schema/tx 
		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
		
</beans>

<!-- 1. 配置处理器映射，springmvc默认的处理器映射器
			 BeanNameUrlHandlerMapping:根据bean的name属性的url去找handlerController -->
		<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
		<!-- 2. 配置处理器适配置器执行Controller -->
		<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
		<!-- 3.配置一个控制器 -->
		<bean name="/user.do" class="com.gyf.backoffice.web.controller.UserController"/>
		<!-- 4.配置springmvc视图解析器
			视图解析器解析的视频路径为：前缀 + 后缀 -->
		<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			<property name="prefix" value="/WEB-INF/views"/>
			<property name="suffix" value=".jsp"/>
		</bean>

<!-- 配置编码过滤器  -->
  	<filter>
  		<filter-name>EncodingFilter</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>EncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

 <!-- 1.配置注解扫描位置 -->
<context:component-scan base-package="com.gyf.backoffice.web.controller"/>
		
<!-- 2. 配置处理器映射，通过注解来查找 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
<!-- 3.配置注解处理适配器来执行控制器的方法 -->	
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
		
<!-- 配置springmvc视图解析器
			视图解析器解析的视频路径为：前缀 + 后缀 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
	<property name="prefix" value="/WEB-INF/views"/>
	<property name="suffix" value=".jsp"/>
</bean>

public class LoginInterceptor implements HandlerInterceptor{
	//controller执行后且视图返回后调用此方法
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		System.out.println("返回视图前  后处理");
	}
	//controller执行后但未返回视图前调用此方法
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		System.out.println("未返回视图前 后处理....");
	}

	// controller执行前调用此方法
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception {
		// TODO Auto-generated method stub
		System.out.println("预处理....");
		//如果是登录页面则放行
		if(request.getRequestURI().indexOf("login.do")>=0){
			return true;
		}
		HttpSession session = request.getSession();
		//如果用户已登录也放行
		if(session.getAttribute("user")!=null){
			return true;
		}
		//用户没有登录挑战到登录页面
		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
		
		return false;
	}
}