Linux 配置JDK

1、ram下载地址

https://www.oracle.com/java/technologies/downloads/

2、如果有安装openjdk 则卸载

[root@anye ~]# java -version
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)
# 检查
[root@anye ~]# rpm -qa|grep jdk
jdk1.8.0_121-1.8.0_121-fcs.x86_64
# 卸载 -e --nodeps 强制删除
[root@anye ~]# rpm -e --nodeps jdk1.8.0_121-1.8.0_121-fcs.x86_64
[root@anye ~]# java -version
-bash: /usr/bin/java: No such file or directory  # OK

3、安装JDK

# 安装java rpm
[root@anye anye]# rpm -ivh jdk-8u321-linux-x64.rpm

# 安装完成后配置环境变量 文件：/etc/profile
JAVA_HOME=/usr/java/jdk1.8.0_321-amd64
CLASSPATH=%JAVA_HOME%/lib:%JAVA_HOME%/jre/lib
PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin
export PATH CLASSPATH JAVA_HOME

# 保存退出

# 让新增的环境变量生效！
source /etc/profile

# 测试 java -version
[root@anye java]# java -version
java version "1.8.0_321"
Java(TM) SE Runtime Environment (build 1.8.0_321-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.321-b07, mixed mode)