javax.servlet.*,javax.servlet.http.*包应用-Filter
A filter is an object that performs filtering tasks on either the request to a resource (a servlet or static content), or on the response from a resource, or both.Filter是针对客户端向服务器请求资源的时候,过滤和校验该请求是否有效的一种方式,其具体的实现方式是.在web.xml中定义
<filter></filter>
<div class="code_title">xml 代码
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