SpringMvc拦截器的配置

最新推荐文章于 2022-11-05 07:00:00 发布

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#拦截器 #教程

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拦截器和过滤器的区别：
1.拦截器和过滤器都可以拦截从页面到服务器的过程
2.过滤器是servlet规范中的一部分，任何java web工程都可以使用
3.拦截器是springmvc特有的
参考demo：
https://download.youkuaiyun.com/download/qq_23095607/11754813
参考视频教程
https://www.bilibili.com/video/av65007912?p=6
搭建教程
1.首先是SpringMVC框架的搭建，不会的话参考我的上一篇文章。
搭建后的结构试图为：
在这里插入图片描述
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>
	<!-- 视图页面配置 -->
	<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>
	<!-- 配置拦截器 -->	
		<mvc:interceptor>
		<!-- 要拦截的 -->
			<mvc:mapping path="/**"/>
			<!-- 不拦截的 -->
			<mvc:exclude-mapping path="/js/**"/>
			<bean class="com.interceptor.MyInterceptor"></bean>
		</mvc:interceptor>
	<!-- 配置第二个拦截器 -->	
		<mvc:interceptor>
		<!-- 要拦截的 -->
			<mvc:mapping path="/**"/>
			<!-- 不拦截的 -->
			<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">点击跳转</a>
        </h3>
        <h3>
            <a href="intercept?name=zhangsan">点击跳转</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>拦截器不允许通过</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;

/*
 * 自定义拦截器
 * */
public class MyInterceptor2 implements HandlerInterceptor{

/*
 * controller 方法执行前执行的方法
 * return  true  表示放行 执行下一个拦截器，如果没有，执行controller里面的值，
 *               否则不放行，用request或者response跳转至某某页面
 * */

	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		// TODO Auto-generated method stub
		System.out.println("拦截器执行了。。。。。。。。。前222");
		//跳转到某个页面，return   false
/*		request.getRequestDispatcher("/WEB-INF/views/interpret.jsp").forward(request, response);
		return false;*/
		return true;
	}
	/*controller后处理的方法，JSP执行之前
	 * 
	 * */
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		System.out.println("拦截器执行了。。。。。。。。。后222");
		// TODO Auto-generated method stub
		
	}
/*
 * JSP执行之后所执行的代码段
 * 不具有跳转页面的功能
 * */
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		System.out.println("拦截器执行了。。。。。。。。。最后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;

/*
 * 自定义拦截器
 * */
public class MyInterceptor implements HandlerInterceptor{

/*
 * controller 方法执行前执行的方法
 * return  true  表示放行 执行下一个拦截器，如果没有，执行controller里面的值，
 *               否则不放行，用request或者response跳转至某某页面
 * */

	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		// TODO Auto-generated method stub
		System.out.println("拦截器执行了。。。。。。。。。前111");
		//跳转到某个页面，return   false
/*		request.getRequestDispatcher("/WEB-INF/views/interpret.jsp").forward(request, response);
		return false;*/
		return true;
	}
	/*controller后处理的方法，JSP执行之前
	 * 
	 * */
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		System.out.println("拦截器执行了。。。。。。。。。后111");
		// TODO Auto-generated method stub
		
	}
/*
 * JSP执行之后所执行的代码段
 * 不具有跳转页面的功能
 * */
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		System.out.println("拦截器执行了。。。。。。。。。最后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");//指定视图
        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");//指定视图
        mv.addObject("message", message);
        mv.addObject("name", name);
        return mv;
    }
}