CentOS下安装Java
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CentOS7下安装Java1.8
wget获取Java官网安装包，并检测安装包大小
ls -lht
创建安装目录（推荐使用/usr/local/java/），并将安装包解压进去
tar -zxvf jdk-8uxxx-linux-x64.tar.gz -C /usr/local/java/
修改环境变量：修改/etc/profile文件
export JAVA_HOME=/usr/local/java/jdk1.8.0_xxx
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
生效新的环境变量并添加软连接
source /etc/profile
ln -s /usr/local/java/jdk1.8.0_xxx/bin/java /usr/bin/java