CentOS下安装JDK

首先准备好jdk压缩包

 

1.创建jdk文件夹目录

[root@localhost /]# mkdir /usr/jdk7
[root@localhost /]# cd /usr/jdk7

2.下载jdk,然后解压

[root@localhost /usr/jdk7]# curl -O http://download.Oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz 
[root@localhost /usr/jdk7]# tar -zxvf jdk-7u79-linux-x64.tar.gz

3.设置环境变量

[root@localhost /usr/jdk7]# vi /etc/profile

4.在profile的最后面添加如下内容:

JAVA_HOME=/usr/jdk7/jdk1.7.0_79
JRE_HOME=/usr/jdk7/jdk1.7.0_79/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

5.保存，然后重新加载系统配置，执行 source /etc/profile

#输入java命令

[root@localhost java]# java -version

[root@localhost java]# javac