spring 过滤器 拦截器 浅谈springMVC拦截器和过滤器总结
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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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