linux:安装JDK

#安装JDK
mkdir /usr/local/java
cp /root/syslog/jdk-6u31-linux-x64.bin  ./
./jdk-6u31-linux-x64.bin
#配置环境变量
vi /etc/profile	
#set java enviroment
export JAVA_HOME=/usr/local/java/jdk1.6.0_31
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/jre/lib/rt.jar

update-alternatives --install /usr/bin/java java /usr/local/java/jdk1.6.0_31/bin/java 60
update-alternatives --config java


#保存退出后，执行下面命令，系统会给予提示，选择使用哪个jdk

source /etc/profile
java -version