Linux 下安装

open jdk

# CentOs
yum install java-1.8.0-openjdk-devel
which -a java
export JAVA_HOE=/usr/lib/jvm/java-1.8.0


# Ubuntu
sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt-get update 
sudo apt-get install openjdk-8-jdk
sudo update-alternatives --config java

sdkman 安装

# https://support.apple.com/kb/DL1572?viewlocale=en_US&locale=en_US

sdk list java
sdk install java 8u144-oracle
sdk install java 6u65-apple   # eclipse 等程序要用 jdk6 运行

# MacOs 删除
/usr/libexec/java_home  # 查看当前JAVA_HOME
sudo rm -rf /Library/Java/JavaVirtualMachines/jdk<version>.jdk
sudo rm -rf /Library/PreferencePanes/JavaControlPanel.prefPane
sudo rm -rf /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -rf /Library/LaunchAgents/com.oracle.java.Java-Updater.plist
sudo rm -rf /Library/PrivilegedHelperTools/com.oracle.java.JavaUpdateHelper
sudo rm -rf /Library/LaunchDaemons/com.oracle.java.Helper-Tool.plist
sudo rm -rf /Library/Preferences/com.oracle.java.Helper-Tool.plist

二进制包安装

1. 从oracle官网下载所需的JDK二进制安装包，并保存到 /data/tmp/ 目录下。

2. 安装

   [root@locahost ~] cd /data/tmp
   [root@locahost ~] ./jdk-6u45-linux-x64.bin                      # 会解压出一个名称为 "jdk1.6.0_45" 的目录
   [root@locahost ~] mv jdk1.6.0_45 /data/software/           # 移动到规约要求的目录下。
   

3. 设置全局环境变量 vi /etc/profile.d/test12.sh

    #!/bin/bash
    export JAVA_HOME=/data/software/jdk1.6.0_45
   
    if [ "${_PATH}" != "1" ]; then
        export _PATH=1
        export PATH=$JAVA_HOME/bin:$PATH
    fi
   

4. 重新登录root用户后确认

    [root@his-branch-proxy1 ~]# java -version
    java version "1.6.0_45"
    Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
    Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)
   
    [root@locahost ~] ln -s -T $JAVA_HOME/bin/java /usr/bin/java  # 如果是用RPM的bin包安装的，则跳过此步骤。
   

压缩包安装

sudo mkdir /usr/local/java
sudo tar zxvf jdk-8u40-linux-x64.tar.gz -C /usr/local/java

# 修改环境变量
vi /etc/profile.d/xxx.sh
export JAVA_HOME=/usr/local/java/jdk1.8.0_40
export PATH=$JAVA_HOME/bin:$PATH

# 重新登录后验证
java -version