Configure jdk8 and tomcat8

Configure jdk8

1. Download
Download address:
Official address (login required):
https://www.oracle.com/cn/java/technologies/javase/javase-jdk8-downloads.html
Download the following version:

Other address:
https://www.jdkdownload.com/
Download the following version:

2. Create installation directory

mkdir -p /usr/java/jdk8

3. Use xftp to move the jdk installation package to any directory, and move the following into the / root directory:

4. Decompression package

tar -zxvf jdk-8u181-linux-x64.tar.gz

5. Move the unzipped file to the installation directory you created and remove the package:
Move:

mv ./jdk1.8.0_181/* /usr/java/jdk8

Delete:

rm -f jdk-8u181-linux-x64.tar.gz

6. Configuration

vim /etc/profile

Press the i key and wrap after the last line unset-f pathmunge, adding the following code:

export JAVA_HOME=/usr/java/jdk8
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

Press the esc key and enter: wq to save and exit.
Then enter the following command:

source /etc/profile

7. Test for successful installation

javac -version

Configure Tomcat 8.0

1. Download the tomcat installation package
Download path:
https://tomcat.apache.org/download-80.cgi

2. Create installation directory

mkdir -p /usr/local/tomcat8

3. Use xftp to move the jdk installation package to any directory, and move the following into the / root directory:

4. Unzip the installation package

tar -vzxf apache-tomcat-8.5.66.tar.gz

5. Move the unzipped directory to the created directory and delete the installation package
Move:

mv apache-tomcat-8.5.66/* /usr/local/tomcat8

Delete:

rm -f apache-tomcat-8.5.66.tar.gz

6. Configuring environment variables

vim /etc/profile

Press the i key and add the following to the code written in the current configuration jdk:

export CATALINE_HOME=/usr/local/tomcat8

And in export PATH=$PATH:$JAVA_Add code after HOME/bin, and the final code is as follows:

export PATH=$PATH:$JAVA_HOME/bin:$CATALINE_HOME/bin

Press the esc key and enter: wq to save and exit.Then type the following command:

source /etc/profile

7. Testing
Enter the following command:

startup.sh

netstat -ano|grep 8080

The tomcat configuration is complete.

Open port 8080 in the firewall

1. Scheme 1:
1) Open port 8080

firewall-cmd --zone=public --add-port=8080/tcp --permanent

2) Restart the firewall

firewall-cmd --reload

3) Check if the port is open

firewall-cmd --zone=public --query-port=8080/tcp

4) Enter your ip address with the port number, i.e.
http://ip Address: 8080
If the above assembly is successful, you can access the above links.

2. Plan 2:
Close the firewall permanently with the following commands:

systemctl disable firewalld.service

Enter the following command to restart:

reboot

After the system restarts, query the firewall status, the command is as follows:

systemctl status firewalld

Proves that the firewall has been permanently closed.
At this point, you need to type a command:

startup.sh

Is accessible http://ip Address: 8080.

Configure tomcat boot-up self-start

Scheme 2 is strongly recommended!
1. Scheme 1
Modify the original configuration file

vim /etc/rc.d/rc.local

Press the i key and enter the following at the end line:

export JAVA_HOME=/usr/java/jdk8
/usr/local/tomcat8/bin/startup.sh

Press the esc key and enter: wq to save and exit.
In the above file, it says: Official advice is best to create your own service file.If you want to use the file, you need to give it permission, that is:

chmod +x /etc/rc.d/rc/local

At this point, the details of the file are as follows:

Then reboot and you can access the link without running the startup.sh command.
2. Plan 2:
Create your own service file.

vim /usr/lib/systemd/system/tomcat.service

Press the i key and type the following:

[Unit]
Description=tomcat
After=network.target

[Service]
Type=oneshot
ExecStart=/usr/local/tomcat8/bin/startup.sh
ExecStop=/usr/local/tomcat8/bin/shutdown.sh
ExecReload=/bin/kill -s HUP $MAINPID
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

Press the esc key and enter: wq to save and exit.
Set tomcat.service to startup with the following commands:

systemctl enable tomcat.service

Enter the following command again to modify setclasspath.sh.

vim /usr/local/tomcat8/bin/setclasspath.sh

Press the i key and enter the following:

export JAVA_HOME=/usr/java/jdk8
export JRE_HOME=/usr/java/jdk8/jre

Press the esc key and enter: wq to save and exit.
Enter reboot.Wait for the restart to access the link.