ubuntu12.04安装sun-jdk-6

#sudo apt-get purge sun-java* #You need to do that if you want the mozilla plugin to work without conflict with java7 for instance.

#mkdir ~/src
#cd ~/src
#git clone
#cd ~/src/oab-java6
#sudo ./oab-java.sh

Then when its finished, install java:
#sudo apt-get install sun-java6-plugin sun-java6-jre sun-java6-bin sun-java6-jdk

You can follow the installation process with:
#tail -f ~/src/oab-java6/oab-java.sh.log

修改当前使用的JDK版本：sudo update-alternatives --config java
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#apt-get purge openjdk*

#apt-add-repository ppa:flexiondotorg/java

#apt-get update

#apt-get install sun-java6-jre sun-java6-jdk sun-java6-plugin

once@once-home:/store/oab-java6$ sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-6-sun-1.6.0.43/bin/java 300

once@once-home:/store/oab-java6$ sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-6-sun-1.6.0.43/bin/javac 300

once@once-home:/store/oab-java6$ sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java-6-sun-1.6.0.43/bin/javap 300

once@once-home:/store/oab-java6$ sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java-6-sun-1.6.0.43/bin/javah 300

once@once-home:/store/oab-java6$ sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java-6-sun-1.6.0.43/bin/jar 300

once@once-home:/store/oab-java6$ sudo update-alternatives --config java