攔截器和過濾器的區別：
1.攔截器和過濾器都可以攔截從頁面到服務器的過程
2.過濾器是servlet規範中的一部分，任何java web工程都可以使用
3.攔截器是springmvc特有的
參考demo：
https://download.csdn.net/download/qq_23095607/11754813
參考視頻教程
https://www.bilibili.com/video/av65007912?p=6
搭建教程
1.首先是SpringMVC框架的搭建，不會的話參考我的上一篇文章。
搭建後的結構試圖爲：
2.pom.xml文件
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.huaxi</groupId>
<artifactId>HelloSpringMVC</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>HelloSpringMVC Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<spring.version>4.1.1.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
<build>
<finalName>HelloSpringMVC</finalName>
</build>
</project>
3.web.xml 文件
<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">
<display-name>Archetype Created Web Application</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
4.springContext.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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jms="http://www.springframework.org/schema/jms"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-4.3.xsd">
<!-- 搜索spring控件 -->
<context:component-scan base-package="com.huaxi"></context:component-scan>
<!-- 視圖頁面配置 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<mvc:interceptors>
<!-- 配置攔截器 -->
<mvc:interceptor>
<!-- 要攔截的 -->
<mvc:mapping path="/**"/>
<!-- 不攔截的 -->
<mvc:exclude-mapping path="/js/**"/>
<bean class="com.interceptor.MyInterceptor"></bean>
</mvc:interceptor>
<!-- 配置第二個攔截器 -->
<mvc:interceptor>
<!-- 要攔截的 -->
<mvc:mapping path="/**"/>
<!-- 不攔截的 -->
<mvc:exclude-mapping path="/js/**"/>
<bean class="com.interceptor.MyInterceptor2"></bean>
</mvc:interceptor>
</mvc:interceptors>
</beans>
5.index.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>Spring 4 MVC - HelloWorld Index Page</title>
</head>
<body>
<center>
<h2>Hello World</h2>
<h3>
<a href="hello?name=zhangsan">點擊跳轉</a>
</h3>
<h3>
<a href="intercept?name=zhangsan">點擊跳轉</a>
</h3>
</center>
</body>
</html>
6.interpret.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>攔截器不允許通過</h1>
</body>
</html>
7.hellospring.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>Spring 4 MVC -HelloWorld</title>
</head>
<body>
<center>
<h2>Hello World</h2>
<h2>
${message} ${name} </h2>
</center>
</body>
</html>
8.MyInterceptor2.java
package com.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerAdapter;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
/*
* 自定義攔截器
* */
public class MyInterceptor2 implements HandlerInterceptor{
/*
* controller 方法執行前執行的方法
* return true 表示放行 執行下一個攔截器，如果沒有，執行controller裏面的值，
* 否則不放行，用request或者response跳轉至某某頁面
* */
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
// TODO Auto-generated method stub
System.out.println("攔截器執行了。。。。。。。。。前222");
//跳轉到某個頁面，return false
/* request.getRequestDispatcher("/WEB-INF/views/interpret.jsp").forward(request, response);
return false;*/
return true;
}
/*controller後處理的方法，JSP執行之前
*
* */
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println("攔截器執行了。。。。。。。。。後222");
// TODO Auto-generated method stub
}
/*
* JSP執行之後所執行的代碼段
* 不具有跳轉頁面的功能
* */
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
// TODO Auto-generated method stub
System.out.println("攔截器執行了。。。。。。。。。最後222");
}
}
9.MyInterceptor.java
package com.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerAdapter;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
/*
* 自定義攔截器
* */
public class MyInterceptor implements HandlerInterceptor{
/*
* controller 方法執行前執行的方法
* return true 表示放行 執行下一個攔截器，如果沒有，執行controller裏面的值，
* 否則不放行，用request或者response跳轉至某某頁面
* */
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
// TODO Auto-generated method stub
System.out.println("攔截器執行了。。。。。。。。。前111");
//跳轉到某個頁面，return false
/* request.getRequestDispatcher("/WEB-INF/views/interpret.jsp").forward(request, response);
return false;*/
return true;
}
/*controller後處理的方法，JSP執行之前
*
* */
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println("攔截器執行了。。。。。。。。。後111");
// TODO Auto-generated method stub
}
/*
* JSP執行之後所執行的代碼段
* 不具有跳轉頁面的功能
* */
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
// TODO Auto-generated method stub
System.out.println("攔截器執行了。。。。。。。。。最後111");
}
}
10.HelloSpringController.java
package com.huaxi;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class HelloSpringController {
@RequestMapping("/hello")
public ModelAndView showMessage(@RequestParam(value = "name", required = false, defaultValue = "Spring") String name) {
String message = "Welcome to Spring MVC!";
ModelAndView mv = new ModelAndView("hellospring");//指定視圖
mv.addObject("message", message);
mv.addObject("name", name);
return mv;
}
@RequestMapping("/intercept")
public ModelAndView intercept(@RequestParam(value = "name", required = false, defaultValue = "Spring") String name) {
String message= "Welcome to intercept!";
ModelAndView mv = new ModelAndView("hellospring");//指定視圖
mv.addObject("message", message);
mv.addObject("name", name);
return mv;
}
}