centos JDK安装设置环境变量

vi /etc/profile
export JAVA_HOME=/root/java/jdk1.6.0_30
export JRE_HOME=/root/java/jdk1.6.0_31/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH