linux 安装 jdk

在线下载JDK 1.7

cd /opt/soft

wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/7u45-b18/jdk-7u45-linux-x64.tar.gz

移动JDK

mv /opt/soft/jdk1.7.0_45 /usr/local/

设置环境变量 

vim /etc/profile

export JAVA_HOME=/usr/local/jdk1.7.0_45
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

让配置文件生效

source /etc/profile