linux 安装jdk

1.在/usr/目录下创建java目录

1 [root@localhost usr]# mkdir java
2 [root@localhost usr]# cd java

2. 下载jdk , jdk官网地址

1 [root@localhost java]# wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz

3. 解压

1 [root@localhost java]# tar zxvf jdk-8u131-linux-x64.tar.gz

4. 设置环境变量

[root@localhost java]# vi /etc/profile

5. 添加如下内容

#set java environment
JAVA_HOME=/usr/java/jdk1.8.0_131
JRE_HOME=/usr/java/jdk1.8.0_131/jre
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASSPATH PATH

6. 让环境变量生效

1 [root@localhost java]# source /etc/profile