JAVA环境变量配置

JAVA_HOME:JDK安装目录
PATH：JDK安装目录/bin(或%JAVA_HOME%/BIN);%TOMCAT_HOME%/BIN
TOMCAT_HOME:TOMCAT安装目录
CLASSPATH：JDK安装目录/jre/lib/rt.jar;.;(.;要写在最后，或者写成.;JDK安装目录/jre/lib/rt.jar;)TOMCAT安装目录/common/lib;JDK安装目录/jre/lib/rt.jar;