ubuntu12.04配置JDK

1.去ORACLE官方網站，下載JDK最新的版本，我這裏是jdk1.7.0_51

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

2.解壓縮至任一目錄，我這裏/home/user/jdk

tar zxvf jdk-7u51-linux-x64.tar.gz -C /home/user/jdk

3.配置JDK環境變量

(1)打開/etc/profile

sudo gedit /etc/profile

(2)添加如下環境變量

# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))  
# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...). 

#set java environment 
export JAVA_HOME=/home/user/jdk/jdk1.7.0_51 
export JRE_HOME=/home/user/jdk/jdk1.7.0_51/jre 
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH   
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$JAVA_HOME:$PATH 

(3)應用環境變量

source /etc/profile

(4)測試一下

java -version