jdk下載地址 http://download.Oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.tar.gz
我把jdk安裝到/opt/java,所以在Terminal窗口裡執行下面的代碼:
sudo mkdir /opt/java
sudo tar zxvf jdk-7-linux-i586.tar.gz -C/opt/java
1. 用編輯器打開 /etc/environment
gedit /etc/environment
2. 修改文件
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:usr/games:${JAVA_HOME}/bin"
JAVA_HOME=/opt/java/jdk1.7.0
JRE_HOME=${JAVA_HOME}/jre
CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib"
3.打開bashrc文件
sudo gedit ~/.bashrc
4.添加如下代碼
export JAVA_HOME=/opt/java/jdk1.7.0
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
5. 重新加載bashrc
source ~/.bashrc
6. 配置默認JDK版本:由於Ubuntu中可能會有默認的JDK,如openjdk,所以,為了將我們安裝的JDK設置為默認JDK版本,還要進行下面的配置:
sudo update-alternatives --install /usr/bin/java java /opt/java/jdk1.7.0/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /opt/java/jdk1.7.0/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /opt/java/jdk1.7.0/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /opt/java/jdk1.7.0/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /opt/java/jdk1.7.0/bin/javap 300
7.然後執行:
sudo update-alternatives --config java
sudo update-alternatives --config javac
sudo update-alternatives --config jar
8.檢測環境是否配好
java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Server VM (build 21.0-b17, mixed mode)