spring mvc xml配置拦截器

程序员文章站 2022-04-24 16:25:01

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spring mvc 有两种配置：（1）注解；（2）基于xml（schema）。

公司要求使用xml方式的，其实在我看来注解更方便；

如何使用xml配置spring mvc的拦截器呢？

场景：比如用户通过浏览器访问我的网站时，我需要判断用户是否已经登录过，若登录过，则允许访问，否则自动跳转到登陆页面。

spring mvc中拦截器类需要继承HandlerInterceptorAdapter 类

代码如下：

package com.yj.mvc.controler.interceptor;

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

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class HandlerInterceptor1 extends HandlerInterceptorAdapter {
	@Override  
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {  
        System.out.println("===========HandlerInterceptor1 preHandle");  
        return true;  
    }  
    @Override  
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {  
        System.out.println("===========HandlerInterceptor1 postHandle");  
    }  
    @Override  
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {  
        System.out.println("===========HandlerInterceptor1 afterCompletion");  
    }  
}

比较重要的方法时preHandle，如果返回false，就请求不会往下传递，就会拒绝请求。所以该方法可用于进行访问控制。

控制器代码如下：

package com.yj.mvc.controler;

import java.util.HashMap;
import java.util.Map;

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

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.view.json.MappingJacksonJsonView;

public class DemoController implements Controller {

	private String name;
	private String age;
	public ModelAndView handleRequest(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		System.out.println("request.getRequestURL():"+request.getRequestURL());
		System.out.println("request.getServletPath():"+request.getServletPath());

		Map root = new HashMap(); 
		ModelAndView modelAndView =new ModelAndView(new MappingJacksonJsonView(), root); 
		return modelAndView;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getAge() {
		return age;
	}
	public void setAge(String age) {
		this.age = age;
	}

}

spring mvc配置文件：springmvc-servlet.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:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
           http://www.springframework.org/schema/tx 
           http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
           http://www.springframework.org/schema/mvc 
           http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">


	<!-- HandlerAdapter -->
	<bean
		class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
	<!-- ViewResolver -->
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">

		<property name="viewClass"
			value="org.springframework.web.servlet.view.JstlView" />
		<property name="viewNames">
			<list>
				<value>org.springframework.web.servlet.view.json.MappingJacksonJsonView
				</value>
			</list>
		</property>
	</bean>




	<mvc:resources mapping="/resource/**" location="/WEB-INF/resource/" />


</beans>

web.xml配置如下：

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	version="3.0">
	<display-name></display-name>
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>
			classpath:beans.xml
		
    	</param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	

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




</web-app>

beans.xml内容：

<?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: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/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"
	default-lazy-init="false">

	<!-- url映射列表,所有控制层Controller的访问路径在这里定义 -->
	<bean id="urlMapping"
		class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
		<property name="mappings">
			<props>
				<prop key="demo.action">demoController</prop>
				<prop key="demo222.action">demoController</prop>
			</props>
			
		</property>
		<property name="interceptors">
			<list>
				<ref bean="handlerInterceptor2" />
			</list>
		</property>
	</bean>
	<!-- 控制器的父类 -->
	<bean id="demoController" class="com.yj.mvc.controler.DemoController">
	</bean>




	<!-- 系统业务参数 -->
	<!-- <bean name="businessParamViewConf" class="com.tdr.otp.ats.conf.BusinessParamViewConf" -->
	<!-- parent="baseController" > -->
	<!-- <property name="businessParamViewService"> -->
	<!-- <ref bean="businessParamViewService" /> -->
	<!-- </property> -->
	<!-- </bean> -->
	<bean id="handlerInterceptor2" class="com.yj.mvc.controler.interceptor.HandlerInterceptor1" />
</beans>

启动服务器后，在浏览器中访问：http://localhost:8080/springmvc_xml/demo.action

后台打印：

===========HandlerInterceptor1 preHandle

request.getRequestURL():http://localhost:8080/springmvc_xml/demo.action

request.getServletPath():/demo.action

===========HandlerInterceptor1 postHandle

===========HandlerInterceptor1 afterCompletion

项目使用maven构建

IDE:eclipse

项目结构：

spring mvc xml配置拦截器

博客分类： Java Webspring MVC springspringmvcschema基于xml拦截器
源代码见附件springmvc_xml.zip

springmvc_xml.zip (11.1 KB)
下载次数: 35

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