The type javax.http.HttpServletRequest cannot be resolved.It is indirectly 解决办法
原因：项目中缺少servlet-api.jar文件。
解决办法：将E:\tomcat\apache-tomcat-6.0.24\lib下的servlet-api.jar拷贝到项目中，然后编译即可。（根据自己安装的tomcat地址不同，目录也有所不同）。
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