刚下载完成的eclipse需要安装java web所有类型的插件，之后再按照网上Tomcat安装步骤进行安装，不然即使把下载完成的插件复制到plugins中，它扔不能产生作用。你可能需要安装的web插件有：
Eclipse Faceted Project Framework
Eclipse Faceted Project Framework JDT Enablement
Eclipse Java EE Developer Tools
Eclipse Java Web Developer Tools
Eclipse SDK
Eclipse Web Developer Tools
Eclipse XML Editors and Tools
Eclipse XSL Developer Tools
JavaScript Development Tools
JST Server Adapters
JST Server Adapters Extensions
JST Serer UI
WST Server Adapters
