[iyunv@centos ~]# java -version@H_502_2@
java version "1.6.0_24"@H_502_2@
OpenJDK Runtime Environment (IcedTea61.11.5)@H_502_2@
(rhel-1.45.1.11.1.el6-3-i386)@H_502_2@
OpenJDK 64-Bit Server VM (build 20.0-b12,mixed mode)@H_502_2@
2.@H_502_2@@H_502_2@ 进一步查看@H_502_2@@H_502_2@ jdk@H_502_2@@H_502_2@ 信息@H_502_2@@H_502_2@
[iyunv@centos ~]# rpm -qa | grep java@H_502_2@
tzdata-java-2012j-1.el6.noarch@H_502_2@
java-1.6.0-openjdk-1.6.0.0-1.50.1.11.5.el6_3.i686@H_502_2@
3.@H_502_2@@H_502_2@ 卸载旧版@H_502_2@@H_502_2@ jdk@H_502_2@@H_502_2@
[iyunv@centos ~]# rpm -e --nodepstzdata-java-2012j-1.el6.noarch@H_502_2@
[iyunv@centos ~]# rpm -e --nodepsjava-1.6.0-openjdk-1.6.0.0-1.50.1.11.5.el6_3.i686@H_502_2@
4.@H_502_2@@H_502_2@ 安装@H_502_2@@H_502_2@ 把已经下载好的jdk安装包上传到/usr/local/java下边，然后解压tar xvf jdk-7u79-linux-x64.gz@H_502_2@
（jdk-7u79-linux-x64.gz是软件包；jdk1.7.0_79是解压后的目录）@H_502_2@
5.@H_502_2@@H_502_2@ 配置环境变量@H_502_2@@H_502_2@
修改/etc/profile文件，@H_502_2@
vi /etc/profile@H_502_2@
在最后添加以下内容@H_502_2@
JAVA_HOME=/usr/local/java/jdk1.7.0_79 //java的目录@H_502_2@
JAVA_BIN=/usr/local/java/jdk1.7.0_79/bin //java的bin目录@H_502_2@
PATH=$PATH:$JAVA_BIN@H_502_2@
CLASSPATH=$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar@H_502_2@
export JAVA_HOME JAVA_BIN PATH CLASSPATH@H_502_2@
@H_502_2@
@H_502_2@
6.@H_502_2@@H_502_2@ 使修改生效@H_502_2@@H_502_2@
[iyunv@centos local]# source /etc/profile //使修改立即生效@H_502_2@
[iyunv@centos local]# echo $PATH //查看PATH值@H_502_2@
@H_502_2@
7.@H_502_2@@H_502_2@ 查看@H_502_2@@H_502_2@ java@H_502_2@@H_502_2@ 版本，验证@H_502_2@@H_502_2@ 。@H_502_2@@H_502_2@
java –version@H_502_2@
