Linux builds a test environment (1)

Install JDK and configure JDK environment

1. Prepare in advance.

• Install the virtual machine
• Install the Linux environment on the virtual machine

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2. Install JDK

1. Check whether the version of the Linux system is 32-bit or 64-bit Enter
   in the Linux command line: uname -a (here is 64-bit)
   

2. Go to the JDK official website to download the 64-bit JDK (the download steps are omitted), and visit the link: http://www.oracle.com/technetwork/java/javase/downloads/index.html

3. After the download is complete, use the xftp tool to upload the jdk on the machine to the Linux server. The directory is the /opt directory (the /opt directory is equivalent to the program file directory of the Windows system). After the upload is complete, view the /opt directory as shown below
   

Delete the JDK that comes with the system, and execute the command rpm -qa | grep java to view the corresponding packages of OpenJDK

Delete these four packages

1. Unzip the JDK compressed package and execute the command tar -xzvf jdk-10_linux-x64_bin.tar.gz, the JDK directory will be generated in the current path
   

2. Configure the relevant environment variables, switch the directory to the /etc/profile file and
   use the vi editor to configure the following content
   A, JAVA_HOME=/opt/jdk-10
   B, PATH=$JAVA_HOME/bin:$PATH
   

   C、需要执行/etc/profil相关的配置才能生效，执行命令如下：source /etc/profile
   D、查看系统是否装上jdk，执行如下命令：java -version，返回如下信息，证明安装成功