新机器安装maven:
sudo apt-get install maven2
安装maven2的时候，默认安装了openjdk
如果不希望openjdk, 而安装sunjdk
卸载掉openjdk
sudo apt-get purge openjdk*
可以把其他服务器上的jdk拷贝过来
sudo scp /usr/lib/jvm/java-6-sun-1.6.0.26 caofy@目标机器:/tmp
sudp cp -r /tmp/java-6-sun-1.6.0.26 /usr/lib/jvm
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-6-sun-1.6.0.26/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-6-sun-1.6.0.26/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java-6-sun-1.6.0.26/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java-6-sun-1.6.0.26/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java-6-sun-1.6.0.26/bin/javap 300
然后：
sudo update-alternatives --config java
测试是否成功：
$ java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)
参考：http://www.cnblogs.com/plinx/archive/2013/06/01/3113106.html