tar -zxvf 压缩文件名.tar.gz
解压到自定文件夹
mkdir /usr/local/java
tar -zxf /home/yixue/software/jdk-7u71-linux-x64.tar.gz -C /usr/local/java
vim /etc/profile
export JAVA_HOME=/usr/local/java/jdk1.7.0_71
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
保存退出。运行 #source /etc/profile
java -version