Ubuntu12.04安装JDK

1、先到官网下载JDK

http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1637583.html

2、将其解压到/usr/lib/jvm

sudotar zxvf ./jdk-7u5-linux-x64.tar.gz -C /usr/lib/jvm

3、修改环境变量，编辑.bashrc

vim ~/.bahsrc

exportJAVA_HOME=/usr/lib/jvm/jdk1.7.0_05

exportJRE_HOME=${JAVA_HOME}/jre

exportCLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

exportPATH=${JAVA_HOME}/bin:$PATH

4、保存退出，输入

source ~/.bashrc

即可生效