JDK

下载地址：http://jdk.java.net/

https://jdk.java.net/archive/

https://jdk.java.net/19/

wget https://download.java.net/java/ga/jdk11/openjdk-11_linux-x64_bin.tar.gz

版本使用：Open-JDK开源免费,Oracle-JDK1.8_201版本以上收费

1.上传JDK

Linux默认自带Open-JDK，所以需要先卸载自带的JDK

2.查看jdk版本

java -version

3.查看安装的JDK信息

rpm -qa | grep java

4.卸载JDK

rpm -e --nodeps java-1.6.0-openjdk-1.6.0.35-1.13.7.1.el6_6.i686
rpm -e --nodeps java-1.7.0-openjdk-1.7.0.79-2.5.5.4.el6.i686
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.265.b01-4.el8.x86_64

5.安装JDK

通常将软件安装到/usr/local

cd /usr/local

创建jdk文件夹

mkdir jdk

解压jdk压缩包

tar -xvf openjdk-11+28_linux-x64_bin.tar.gz -C ./jdk
#centOs解压报错处理:中文-和英文-
tar xvf openjdk-11+28_linux-x64_bin.tar.gz -C ./jdk

6.配置JDK环境

cd /etc/profile.d
vi java.sh

#set java environment


JAVA_HOME=/usr/local/jdk-11
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME PATH

#export PATH=.:$JAVA_HOME/bin:$PATH
#set JDK Environment
#export JAVA_HOME=/usr/local/jdk/jdk-11
#export PATH=$PATH:$JAVA_HOME/bin
#export JAVA_HOME=/usr/local/jdk/jdk-11
#export PATH=$JAVA_HOME/bin:$PATH                            

source /etc/profile