拦截器: 用来对访问的url进行拦截处理
用处: 权限验证,乱码设置等
spring-mvc.xml文件中的配置:
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http://www.springframework.org/schema/tx ">
<!--编写拦截器--> <mvc:interceptors> <!--对特定的url拦截--> <mvc:interceptor> <mvc:mapping path="/test.do"/> <bean class="com.hbut.interceptor.testinterceptor"/> </mvc:interceptor> <mvc:interceptor> <!--对特定的模块拦截第一级别拦截--> <mvc:mapping path="/test/×/"/> <bean class="com.hbut.interceptor.testinterceptor1"/> </mvc:interceptor> <mvc:interceptor> <!--对特定的模块拦截--> <mvc:mapping path="/test/×"/> <bean class="com.hbut.interceptor.testinterceptor2"/> </mvc:interceptor> </mvc:interceptors>
对所有的url进行拦截
<mvc:interceptors> <bean class="org.springframework.web.servlet.i18n.localechangeinterceptor"/> </mvc:interceptors>
java代码
package com.hbut.interceptor; import org.springframework.web.servlet.handlerinterceptor; import org.springframework.web.servlet.modelandview; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; /** * @author xijun.gong * @date 2016/6/1. * aim: com.hbut.interceptor */ public class testinterceptor implements handlerinterceptor { @override public boolean prehandle(httpservletrequest httpservletrequest, httpservletresponse httpservletresponse, object o) throws exception { //todo 在此处添加要操作code system.out.println("prehandle"); return true; //todo 此处为false时,请求不会到达control层 } @override public void posthandle(httpservletrequest httpservletrequest, httpservletresponse httpservletresponse, object o, modelandview modelandview) throws exception { system.out.println("posthandle"); //todo 可以用来修改信息,跳转等 } @override public void aftercompletion(httpservletrequest httpservletrequest, httpservletresponse httpservletresponse, object o, exception e) throws exception { system.out.println("aftercompletion"); //todo 最后执行 } }
另一种拦截器:大同小异
package com.hbut.interceptor; import org.springframework.ui.modelmap; import org.springframework.web.context.request.webrequest; import org.springframework.web.context.request.webrequestinterceptor; /** * @author xijun.gong * @date 2016/6/1. * aim: com.hbut.interceptor */ public class test2interceptor implements webrequestinterceptor { @override public void prehandle(webrequest webrequest) throws exception { } @override public void posthandle(webrequest webrequest, modelmap modelmap) throws exception { } @override public void aftercompletion(webrequest webrequest, exception e) throws exception { } }
过滤器: 依赖于servlet容器,使用回调函数,过滤范围大
拦截器: 依赖于框架容器 比如spring、mybatis ,灵活
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