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引入包import javax.servlet.http.HttpServletRequest错误

ServletMyeclipseEclipseTomcatWeb 
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我在Eclipse里新建项目，添加java文件，并输入import javax.servlet.http.HttpServletRequest，但程序错误。我需要在哪儿下载什么包吗？下载后又该怎么操作呢？谢谢大家！

就用tomcat的那个servlet-api.jar就成。。。
下载好后设置一下build path..
或直接装个插件比如myeclipse，你建WEB项目时，会自动帮你添加进来。

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