下载
http://www.oracle.com/technetwork/java/javase/downloads/index.html

解压到指定目录

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sudo tar zxvf ./jdk-x-linux-xxx.tar.gz -C /usr/lib/jvm
cd /usr/lib/jvm
sudo mv jdk1.x.x java-7-oracle

修改环境变量

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export JAVA_HOME=/usr/lib/jvm/java-7-oracle
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH