Foreword:
I believe everyone is familiar with jdk, today I will talk about the detailed steps of dark account jdk on Linux.
1. Execute commands to query the system's own JDK service
Sometimes the Linux Centos we install may bring java, but it is not the version we want, so we can first check whether Centos has java installed. If you don’t want the shoes, install the version you want.
rpm -qa | grep java
可能得到以下结果：
java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
……
javapackages-tools-3.4.1-11.el7.noarchIf it is found that it is not the version we want, such as 1.7 java, we can uninstall it.
2. Execute commands to uninstall some of the built-in java services
rpm -e --nodeps java-1.7.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
rpm -e --nodeps java-1.7.0-openjdk-1.8.0.102-4.b14.el7.x86_643. Install java1.8 version
Upload the software package jdk-8u181-linux-x64.tar.gz to a directory in Linux, such as /home/download
The address of the software package provided in this article:
3.1 Execute the following commands:
tar xvf jdk-8u181-linux-x64.tar.gz 进行解压缩
mv jdk1.8.0_181 jdk 更改目录名称为jdk
3.2 Configure environment variables:
vi etc/profile
Add the following command to the file
| export JAVA_HOME=/home/download/jdk export JRE_HOME=/home/download/jdk/jre export PATH=$PATH:$JAVA_HOME/bin export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar |
Save the file after modification
3.3 Verification takes effect
Execute the source /etc/profile command
Execute java -version
If the following shows the version number, it means the installation is successful.
If you have any questions, you can leave a message, and you will definitely reply when you see it.