一、Java环境的配置安装

1、新建Java安装目录。

[root@localhost ~]# mkdir /opt/java

2、下载jdk安装包。

wget --no-cookies --no-check-certificate http://download.oracle.com/otn-pub/java/jdk/8u60-b27/jdk-8u60-linux-x64.tar.gz

3、解压安装包，授已执行权限。

[root@localhost java]# tar xzvf jdk-8u60-linux-x64.tar.gz

[root@localhost java]# ls
jdk1.8.0_60  jdk-8u60-linux-x64.tar.gz
[root@localhost java]# chmod -R 755 jdk1.8.0_60/

二、设置环境变量

1、修改配置文件/etc/profile在文件的末尾加入如下的信息：

JAVA_HOME=/opt/java/jdk1.8.0_60
CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin
export JAVA_HOME JAVA_BIN PATH CLASSPATH

2、使配置文件生效

[root@localhost java]#.  /etc/profile

3、验证：

[root@localhost java]# java -version
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)
[root@localhost java]# echo $JAVA_HOME
/opt/java/jdk1.8.0_60
[root@localhost java]# echo $CLASSPATH
:/opt/java/jdk1.8.0_60/lib:/opt/java/jdk1.8.0_60/jre/lib
[root@localhost java]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/opt/java/jdk1.8.0_60/bin:/opt/java/jdk1.8.0_60/jre/bin