centos7 安装jdk8 bash脚本 并配置环境变量

#!/bin/bash
#安装java脚本

if type -p java; then
    echo 'java已安装.'
    exit
else
    echo '开始安装java...'
    wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u152-b16/aa0333dd3019491ca4f6ddbe78cdb6d0/jdk-8u152-linux-x64.rpm"
    #yum localinstall jdk-8u152-linux-x64.rpm
    rpm -i jdk-8u152-linux-x64.rpm
    if ! type -p java; then
        echo 'java安装异常...'
        exit
    else
        echo '正在设置环境变量...'
        echo 'export JAVA_HOME="/usr/java/default"' >> /etc/environment
        source /etc/environment
        echo '安装成功.'
    fi
fi