tar zxvf ./jdk-7u45-linux-x64.tar.gz 解压缩软件包
mv jdk1.7.0_45/ jdk1.7/
vi /root/.bashrc 添加环境变量
export JAVA_HOME=/opt/Java/jdk/jdk1.7
export CLASSPATH=${JAVA_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
source /root/.bashrc 使环境变量生效JDK安装
原文：https://blog.51cto.com/13557278/2407900
