1.JAVA_HOME环境变量:C:\Program Files\Java\jdk1.8.0_45
2.CLASSPATH环境变量:%JAVA_HOME%\libs\tools.jar;%JAVA_HOME%\libs\dt.jar
3.PATH环境变量：%JAVA_HOME%\bin;
4.Tomcat的配置参见说明文档，主要要设置CATALINA_HOME环境变量，为tomcat所在目录
5.Eclipse要使用eclipse for j2ee或者使用MyEclipse
6.JRE->JDK
Window->Preferences->Java->intalled JREs->Add-> ->安装的JDK->finish
7.Eclipse中配置Tomcat
Window->Preferences->Server->Runtime Environments->Add
8.编码方式
Window-》Preferences->General->Workspace->Text file encoding->Other
Windows下JDK，Tomcat，Eclipse安装配置
原文：http://www.cnblogs.com/njuzwr/p/4787013.html