servlet实现文件下载demo

一：web.xml配置servlet入口

<span style="font-size:18px;"><strong>       <servlet>   <servlet-name>DownLoadAttachmentServlet</servlet-name>    <servlet-class>com.bright.servlet.DownLoadAttachmentServlet</servlet-class></servlet><servlet-mapping>   <servlet-name>DownLoadAttachmentServlet</servlet-name>   <url-pattern>/downloadAttachment.do</url-pattern></servlet-mapping></strong></span>

二：Servlet实现 

三：调用方式  XXXX/downloadAttachment.do注意用post方式提交