The type javax.servlet.http.HttpServletRequest cannot be resolved. It is indirectly referenced from

 required .class files
 
是缺少serverlet的引用库，解决如下

1.工程右键-properties->java build path

2.在java build path的libraries tab页中选择Add external Jars...按钮

3. 选择eclipse的安装目录，我的是绿色版本，我本机的路径如下，你自己需要根据自己的路径查找添加。E:\eclipse-java-indigo-SR1-win32\eclipse\plugins 选择javax.servlet.jsp_2.0.0.v201101211617.jar；javax.servlet_2.5.0.v201103041518.jar 进行添加即可

注释：由于版本不同，文件包名可能稍有区别。
链接地址：http://blog.csdn.net/smartzhaomin/article/details/19487907

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