阿里云centos7服务器卸载openJDK并安装jdk

1.查看已经安装的jdk

rpm -qa|grep jdk

显示结果如下

java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64
java-1.8.0-openjdk-headless-1.8.0.161-0.b14.el7_4.x86_64
copy-jdk-configs-2.2-5.el7_4.noarch

 

2.用yum卸载openJDK

yum -y remove java-1.8.0-openjdk-headless-1.8.0.161-0.b17.el7.x86_64

3.查看java版本是否已经卸载

java -version

-bash: java: 未找到命令

 

4.使用wget下载压缩包

wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u141-b15/336fa29ff2bb4ef291e347e091f7f4a7/jdk-8u141-linux-x64.tar.gz"

5.进入/usr/local创建java目录

cd /usr/local
mkdir java
cd ~

 

6.解压到/usr/local/java

tar -zxvf jdk-8u141-linux-x64.tar.gz -C /usr/local/java/

 

7.安装完毕之后在/etc/profile文件末尾添加

vim /etc/profile

export JAVA_HOME=/usr/local/java/jdk1.8.0_141
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

8.使/etc/profile生效

source /etc/profile

 

9.再次查看java是否安装成功

java -version 

显示结果如下

java version "1.8.0_141"
Java(TM) SE Runtime Environment (build 1.8.0_141-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.141-b15, mixed mode)

10.创建软连接

cd /usr/bin
ln -s -f /usr/local/java/jdk1.8.0_141/bin/java