Ubuntu安装Sun JDK

Ubuntu 14.04 下安装 Sun JDK 1.8.0

1.下载JDK

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

jdk-8-linux-x64.tar.gz

2.解压到安装目录

$ sudo mkdir /usr/lib/jvm
$ sudo tar zxvf jdk-8-linux-x64.tar.gz -C /usr/lib/jvm
$ cd /usr/lib/jvm
$ sudo mv jdk1.8.0 java

3.添加环境变量

$ sudo vim ~/.bashrc

在后面加入以下内容

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

4.配置默认JDK版本

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java/bin/javap 300
sudo update-alternatives --config java

如果非初次安装，会出现不同版本的 JDK 选项。如果是初次安装,会有以下提示：

There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/java/bin/java
无需配置。

5.测试环境

$ java -version

引用地址：http://www.cnblogs.com/plinx/archive/2013/06/01/3113106.html