spring-mvc-day03

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本文详细介绍了Spring MVC框架中拦截器的工作原理及其配置方式。通过实例代码展示了如何使用拦截器进行请求处理前后的操作，并解释了拦截器在Spring MVC中的作用与配置细节。

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Controller包

-----------------------------------HelloController------------------

package Controller;

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

@Controller
public class HelloController {

   @RequestMapping("/hello.do")
   public String hello() {

       System.out.println("hello方法");
       return "hello";
   }

   /**
   *这个方法，拦截器不会拦截 ,
   *除非配置中加两个**
   *<mvc:mapping path="/**"/>
   */
   @RequestMapping("/demo/hello.do")
   public String hello2() {

       System.out.println("hello2()方法");
       return "hello";
   }
}

===================interceptors包 HandlerInterceptor类=====================================

package interceptors;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
*拦截器
*
*/
public class SomeInterceptor implements HandlerInterceptor{

       /**
       * 前端控制器收到请求之后，会先调用preHandle的方法，如果该方法返回值为true，
       * 表示继续向后调用，否则请求处理结束
       * preHandle方法的第三个参数Object，是表示处理器的方法对象。
       * (此处的对象指的是hello()方法。在反射机制中，可以用一个对象表示)
       */
   public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
           throws Exception {
       System.out.println("这是preHandle方法");
       return true;

   }

       /**
       * 处理器Controller的方法执行完毕，准备返回ModelAndView给前端控制器之前
       * 执行postHandle方法
       */
   public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
           ModelAndView modelAndView) throws Exception {
           System.out.println("postHandle()方法");

   }

       /**
       * 整个请求已经处理完毕，执行的方法。
       * Exception ex是处理器方法运行时抛出的异常，
       *
       */
   public void afterCompletion(
   HttpServletRequest request, HttpServletResponse response,
   Object handler, Exception ex)
           throws Exception {
       System.out.println("afterCompletion()方法");

   }


}
------------------------------------------------spring-mvc.xml配置文件-----------------------------------------------------------------

<?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:context="http://www.springframework.org/schema/context"
   xmlns:jdbc="http://www.springframework.org/schema/jdbc"
   xmlns:jee="http://www.springframework.org/schema/jee"
   xmlns:tx="http://www.springframework.org/schema/tx"
   xmlns:aop="http://www.springframework.org/schema/aop"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
   xmlns:util="http://www.springframework.org/schema/util"
   xmlns:jpa="http://www.springframework.org/schema/data/jpa"
   xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
       http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
       http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">

<context:component-scan base-package="Controller"></context:component-scan>

   
   <mvc:annotation-driven/>

   
   <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
   <property name="prefix" value="/WEB-INF/"></property>
   <property name="suffix" value=".jsp"></property>

   </bean>

   
   <mvc:interceptors>
       <mvc:interceptor>
           
           <mvc:mapping path="/**"/>
           
           <bean class="interceptors.SomeInterceptor"></bean>
       </mvc:interceptor>

   </mvc:interceptors>

</beans>
----------------------------------web.xml---------------------------============

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<display-name>springcase-springmvc03</display-name>


    <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:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
</web-app>

====================hello.jsp=====================

<%@ page 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>first spring-mvc</title>

</head>
<body style="font-size: 30px;font-style: italic;">
Hello,SpringMVC!
</body>
</html>