jdk1.7.0_79.tar安装

安装包：http://pan.baidu.com/s/1eSdR0Wi

/usr/local/java 把安装包上传到这里；

解压jdk：sudo tar xvf jdk1.7.0_79.tar

修改配置文件：vim .bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
# User specific environment and startup programs
#PATH=$PATH:$HOME/bin
export JAVA_HOME=/usr/local/java/jdk1.7.0_79
export JRE_HOME=/usr/local/java/jdk1.7.0_79/jre
export CLASSPATH=.:%JAVA_HOME%/lib/dt.jar:%JAVA_HOME%/lib/tools.jar
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

source ~/.bash_profile
使得配置文件生效

java -version 查看是否安装成功
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)