Linux installation jdk1.8 environment

1. Download the jdk package from the official website:

2. Check whether jdk is installed in the current system:

java -version
# 查看java包
rpm -aq | grep java
# 若有原先自带的先卸载，卸载OpenJDK
rpm -e --nodeps java-1.8.0-openjdk-1.8.0.242.b08-1.el7.x86_64
# 或者
yum remove *openjdk*

# 再次查看
rpm -aq | grep java

3. Upload the jdk package to the server and manually install the JDK:

#安装JDK包
rpm -ivh jdk-8u331-linux-x64.rpm
# 进入到安装目录
cd /usr/java/jdk1.8.0_331-amd64/

#添加环境变量
vi /etc/profile
export JAVA_HOME=/usr/java/jdk1.8.0_331-amd64
export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar
export PATH=$JAVA_HOME/bin:$PATH

#刷新配置文件
source /etc/profile

JAVA_HOME = /opt/jdk1.8.0_181
CLASSPATH = . : $JAVA_HOME/lib/dt.jar : $JAVA_HOME/lib/tools.jar
PATH = $JAVA_HOME/bin : $PATH
export JAVA_HOME CLASSPATH PATH

4. Check the newly installed JDK

java -version
java
javac