csw.dawn的部落格

1. 先到 http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

    下載 jdk

2. 解壓縮

    $ tar zxvf jdk-7u51-linux-i586.tar.gz

3. 建立jdk目錄

    $ sudo mkdir /usr/lib/jdk

4. Copy jdk 到 /usr/lib 目錄下

    $ sudo cp -r jdk1.7.0_51 /usr/lib/jdk

5. 設定環境變數

    $ sudo vim /etc/profile

    加上以下內容:

        export JAVA_HOME=/usr/lib/jdk/jdk1.7.0_51

        export JRE_HOME=/usr/lib/jdk/jdk1.7.0_51/jre

        export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin

        export \

CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:\

$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar

6. 置換系統默認 jdk

    $ sudo update-alternatives --install /usr/bin/java java /usr/lib/jdk/jdk1.7.0_51/bin/java 300

    $ sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jdk/jdk1.7.0_51/bin/javac 300

    $ sudo update-alternatives --config java

    $ sudo update-alternatives --config javac

7. 確認安裝

    $ java -version

     java version "1.7.0_51"

     Java(TM) SE Runtime Environment (build 1.7.0_51-b13)

    Java HotSpot(TM) Client VM (build 24.51-b03, mixed mode)