CentOS配置JDK

1. 通过xmanager的Xftp上传jdk1.7.0_55.tar.gz 文件到/opt目录
2. 解压缩jdk1.7.0_55.tar.gz 文件
   tar -zxf jdk1.7.0_55.tar.gz
   解压后即可，看到/opt/jdk1.7.0_55文件夹
3. 配置环境变量，修改/etc/profile,在末尾添加

export JAVA_HOME=/opt/jdk1.7.0_55
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

4.使配置生效
source /etc/profie
5. 检查jdk

[root@centos67 jdk1.7.0_55]# java -version
java version "1.7.0_55"
Java(TM) SE Runtime Environment (build 1.7.0_55-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.55-b03, mixed mode)