Ubuntu 14.04 安装JDK 1.8

安装环境

root@linuxidc:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.4 LTS
Release:        14.04
Codename:       trusty
root@linuxidc:~# 

下载jdk1.8

如何查看linux的平台版本

root@linuxidc:~# uname -m
x86_64
root@linuxidc:~# 

安装过程

root@linuxidc:~/download# sudo mkdir /usr/java
root@linuxidc:~/download# 
root@linuxidc:~/download# 
root@linuxidc:~/download# sudo tar zxvf jdk-8u111-linux-x64.tar.gz  -C /usr/java

//添加环境变量
root@linuxidc:~/sudo vi ~/.bashrc
//在文档末尾添加如下代码：
    export JAVA_HOME=/usr/java 
    export JRE_HOME=${JAVA_HOME}/jre  
    export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
    export PATH=${JAVA_HOME}/bin:$PATH 


root@linuxidc:~/download# 
root@linuxidc:~/download# sudo update-alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_111/bin/java 300
root@linuxidc:~/download# 
root@linuxidc:~/download# sudo update-alternatives --install /usr/bin/javac javac /usr/java/jdk1.8.0_111/bin/javac 300
root@linuxidc:~/download# 
root@linuxidc:~/download# 
root@linuxidc:~/download# sudo update-alternatives --install /usr/bin/jar jar /usr/java/jdk1.8.0_111/bin/jar 300
root@linuxidc:~/download# 
root@linuxidc:~/download# sudo update-alternatives --install /usr/bin/javah javah /usr/java/jdk1.8.0_111/bin/javah 300
root@linuxidc:~/download# 

// 这里注意usr/java/jdk1.8.0_111 是我解压自己的文件夹

root@linuxidc:~/download# sudo update-alternatives --config java
There is only one alternative in link group java (providing /usr/bin/java): /usr/java/jdk1.8.0_111/bin/java
Nothing to configure.
root@linuxidc:~/download# 
root@linuxidc:~/download# 
root@linuxidc:~/download# java -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)
root@linuxidc:~/download# 

结束