CenterOS Install Jave(JRE+JDK)

CenterOS Jave Install:
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rpm包安装下载地址：
http://download.oracle.com/otn-pub/java/jdk/7u6-b24/jre-7u6-linux-x64.rpm
http://download.oracle.com/otn-pub/java/jdk/7u6-b24/jdk-7u6-linux-x64.rpm

tar.gz源码安装下载地址：
http://download.oracle.com/otn-pub/java/jdk/7u6-b24/jdk-7u6-linux-x64.tar.gz
http://download.oracle.com/otn-pub/java/jdk/7u6-b24/jre-7u6-linux-x64.tar.gz


先查看服务器之前是否装过java环境：
root@localhost# yum list installed|grep java
root@localhost# rpm -qa | grep gcj
    java-x.x.x.........

如果有则卸载掉老的java环境：
yum -y remove java-x.x.x.........
rpm -e --nodeps java-x.x.x.........


选择用rpm包来安装，建立目录/usr/local/java吧2个rpm包下载到这里
root@localhost# mkdir /usr/local/java
root@localhost# cd /usr/local/java

root@localhost# rpm -ivh jre-7u6-linux-x64.rpm
root@localhost# rpm -ivh jdk-7u6-linux-x64.rpm

jre和jdk被rpm默认安装到/usr/java目录下了。

查看安装是否成功：
root@localhost# java -version
    java version "1.7.0_06"
    Java(TM) SE Runtime Environment (build 1.7.0_06-b24)
    Java HotSpot(TM) 64-Bit Server VM (build 23.2-b09, mixed mode)

修改环境变量：
vim /ect/profile

export JAVA_HOME=/usr/java/jdk1.7.0_06
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local/mysql/bin:$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HOMR/bin:/usr/java/jre1.7.0_06/bin

是环境变量立即生效：
source /etc/profile

查看环境变量：
echo $JAVA_HOME

运行一个java程序测试下：
java -jar xx.jar