安装JDK

1.官网地址

www.oracle.com/java/techno…

2.将压缩包传入服务器

3.解压安装包

4.移动到目录 /usr/lib/jvm/ 中

sudo mkdir /usr/lib/jvm
sudo mv jdk-13.0.2 /usr/lib/jvm/

5.配置环境变量, 编辑文件 /etc/profile, 在末尾添加

vi /etc/profile

# jdk config
export JAVA_HOME=/usr/lib/jvm/jdk-13.0.2
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH={JAVA_HOME}/bin:$PATH

6.使环境变量生效

source /etc/profile

7.配置jdk

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-13.0.2/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-13.0.2/bin/javac 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/jdk-13.0.2/bin/javap 300 
sudo update-alternatives --install /usr/bin/javadoc javadoc /usr/lib/jvm/jdk-13.0.2/bin/javafoc 300

8.安装成功

java -version

阿里云服务器安装JDK（Ubuntu）

安装JDK