服务器安装jdk（rpm安装）

1、rpm下载地址http://www.oracle.com/technetwork/java/javase/downloads/index.html

2、如果有安装openjdk 则卸载

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[root@kuangshen ~]# 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@kuangshen ~]# rpm -qa|grep jdk jdk1.8.0_121-1.8.0_121-fcs.x86_64 # 卸载 -e --nodeps 强制删除 [root@kuangshen ~]# rpm -e --nodeps jdk1.8.0_121-1.8.0_121-fcs.x86_64 [root@kuangshen ~]# java -version -bash: /usr/bin/java: No such file or directory  # OK

3、安装JDK

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# 安装java rpm [root@kuangshen kuangshen]# rpm -ivh jdk-8u221-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_221-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@kuangshen java]# java -version java version "1.8.0_221" Java(TM) SE Runtime Environment (build 1.8.0_221-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)