2021-10-29

jdk安装

1. 查看centos自带的openjdk安装包：
   rpm -qa | grep openjdkv

2. 卸载centos7的openjdk：
   yum -y remove java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64

3. 下载jdk1.8
   http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

4. 解压jdk安装包

   tar -xvf jdk-8u201-linux-x64.tar.gz 
   vi /etc/profile

5. JAVA_HOME=/home/xxx/software/jdk1.8.0_201
   JRE_HOME=/home/xxx/software/jdk1.8.0_201/jre
   PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
   CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
   export JAVA_HOME JRE_HOME PATH CLASSPATH

6. 是profile文件生效
   sourece /etc/profile

7. 测试Java是否安装成功
   java -version