ubuntu 下java开发环境安装

先更新源,
sudo gedit /etc/apt/sources.list

 加上cn99的源或者其他源
deb http://ubuntu.cn99.com/ubuntu/ feisty main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-security main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-updates main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-backports main restricted universe multiverse

福州电信源:
deb http://ubuntu.cnsite.org/ubuntu/ feisty main restricted universe multiverse
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu/ feisty-updates main restricted universe multiverse
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty-updates main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty-backports main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu/ feisty-security main restricted universe multiverse
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty-security main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu/ feisty-proposed main multiverse restricted universe
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty-proposed main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu-cn/ feisty main multiverse restricted universe

保存，关闭。

安装JDK

打开终端 ，执行下面命令：

sudo apt-get install sun-java6-jdk
设置当前默认的java解释器
sudo update-alternatives --config java

设置环境变量：
sudo gedit /etc/environment
在其中添加如下两行：
CLASSPATH=/usr/lib/jvm/java-6-sun/lib
JAVA_HOME=/usr/lib/jvm/java-6-sun

安装eclipse

下载eclipse3.2 for linux版本
可以从 http://www.eclipse.org/downloads/ 这里下载，也可以直接下载此安装包
下载后将解压此包文件，会得到一个eclipse目录。可以将此目录放到 /opt/ 下面。
进入到eclipse 目录

 cd /opt/eclipse

设置文件eclipse执行权：


chown -R root:你的用户名 eclipse

 创建桌面连接 

sudo gedit /usr/share/applications/eclipse.desktop

加入下面内容   

[Desktop Entry]
Encoding=UTF-8
Name=Eclipse
Comment=Eclipse SDK
Exec=/opt/eclipse/eclipse
Icon=/opt/eclipse/icon.xpm
Terminal=false
Type=Application
Categories=Application;Development;

保存后就完成了eclipse的安装!