spring mvc 拦截器

水深无声 2021-06-24 14:00 413阅读 0赞

1、xml方式配置：

2、 基于注解的配置：

<mvc:interceptors>
    	    
    	    <mvc:interceptor>
    	       <mvc:mapping path="/entryOrJsonController/*" />
    	       <bean class="com.wy.interceptor.CommonInterceptor"></bean>
    	    </mvc:interceptor>
    	</mvc:interceptors>

3、拦截器：

package com.wy.interceptor;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.log4j.Logger;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    public class CommonInterceptor implements HandlerInterceptor {
    
    	private Logger log = Logger.getLogger(CommonInterceptor.class);
    	
    	public CommonInterceptor() {
    		// TODO Auto-generated constructor stub
    	}
    
    	private String mappingURL;//利用正则映射到需要拦截的路径  
            public void setMappingURL(String mappingURL) {  
                   this.mappingURL = mappingURL;  
           } 
    
    	/**
    	 * 在业务处理器处理请求之前被调用
    	 * 如果返回false
    	 *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
    	 * 
    	 * 如果返回true
    	 *    执行下一个拦截器,直到所有的拦截器都执行完毕
    	 *    再执行被拦截的Controller
    	 *    然后进入拦截器链,
    	 *    从最后一个拦截器往回执行所有的postHandle()
    	 *    接着再从最后一个拦截器往回执行所有的afterCompletion()
    	 */
    	@Override
    	public boolean preHandle(HttpServletRequest request,
    			HttpServletResponse response, Object handler) throws Exception {
    		// TODO Auto-generated method stub
    		log.info("==============执行顺序: 1、preHandle================");
    		String url=request.getRequestURL().toString();  
            if(mappingURL==null || url.matches(mappingURL)){  
    			request.getRequestDispatcher("/msg.jsp").forward(request, response);
    			return false; 
            }  
    		return true;
    	}
    
    	//在业务处理器处理请求执行完成后,生成视图之前执行的动作 
    	@Override
    	public void postHandle(HttpServletRequest request,
    			HttpServletResponse response, Object handler,
    			ModelAndView modelAndView) throws Exception {
    		// TODO Auto-generated method stub
    		log.info("==============执行顺序: 2、postHandle================");
    	}
    
    	/**
    	 * 在DispatcherServlet完全处理完请求后被调用 
    	 * 
    	 *   当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
    	 */
    	@Override
    	public void afterCompletion(HttpServletRequest request,
    			HttpServletResponse response, Object handler, Exception ex)
    			throws Exception {
    		// TODO Auto-generated method stub
    		log.info("==============执行顺序: 3、afterCompletion================");
    	}
    
    }

注意：注释中的说明。

完整的spring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:mvc="http://www.springframework.org/schema/mvc"
            xmlns:util="http://www.springframework.org/schema/util" 
            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/mvc    
              http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
              http://www.springframework.org/schema/util 
              http://www.springframework.org/schema/util/spring-util-3.0.xsd">
        
        
        
        
        <mvc:resources mapping="/js/**" location="/js/" />
        
        
    	<context:component-scan base-package="com.wy.controller.annotation" />
    	
    	
    	<bean
    		class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" >
    	    <property name="interceptors">
    	       
    	       <list>
    	          <ref bean="commonInterceptor"/>
    	       </list>
    	    </property>
    	</bean>
    	
    	<bean id="commonInterceptor" class="com.wy.interceptor.CommonInterceptor">
    	   <property name="mappingURL" value=".*/entryOrJsonController\.do\?action=reg.*"/>
    	</bean>
    		
    	
    	<bean
    		class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
    	    <property name="messageConverters">  
             	<util:list id="beanList">  
                    <ref bean="mappingJacksonHttpMessageConverter"/>  
            	</util:list>  
        	</property> 
    	</bean>
    	
    	
    	<mvc:view-controller path="/hello" view-name="hello" />
    	 
    	
    	
    	<bean
    		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		
    		<property name="prefix" value="/WEB-INF/page/" />
    		<property name="suffix" value=".jsp" />
    	</bean>
    	
    	
    	<bean id="mappingJacksonHttpMessageConverter" 
    	    class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> 
    	     
        	<property name="supportedMediaTypes">  
           		<list>  
              		  <value>text/html;charset=UTF-8</value>  
           	 	</list>  
        	</property>  
    	</bean>  
    	
    	
    	<mvc:interceptors>
    	    
    	    <mvc:interceptor>
    	       <mvc:mapping path="/entryOrJsonController/*" />
    	       <bean class="com.wy.interceptor.CommonInterceptor"></bean>
    	    </mvc:interceptor>
    	</mvc:interceptors>
    	
        
    	
    </beans>