1, Go to the official website to download JDK

1. Download this file with IE browser, then go to download center to pause and copy download link

Select IE browser

2. Download

# Switch directories
cd /
# Create a folder Java 
mkdir usr/local/java
# Enter this folder
cd /usr/local/java
# Put the copied download link 'ctrl+insert' here
wget Download link

3. Unzip
chmod +x jdk-8u191-linux-x64.tar.gz
tar xzf jdk-8u191-linux-x64.tar.gz -C /usr/java

4. Set environment variables:
a. open / etc/profile: vi /etc/profile and press i to enter editing mode
b. enter the following information ctrl+insert, and pay attention to your version number

export JAVA_HOME=/usr/local/java/jdk1.8.0_191
export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH

c. press Esc key to exit editing mode, input: wq to save and close the file
d. load environment variable: source /etc/profile
e. when running the Java version command and displaying the JDK version information, it indicates that the JDK has been installed successfully

2, Download and install Tomcat on the official website

1. Create a generic user www to run Tomcat:
   useradd www
2. Create site root:
   mkdir -p /data/wwwroot/default
3. This example will create a new Tomcat test page directly in the root directory of the website
   echo Tomcat test > /data/wwwroot/default/index.jsp

chown -R www.www /data/wwwroot

1. The same way to go to the official download link
   cd /usr/local

wget download link

1. Unzip the installation and pay attention to your version
   Unzip tar xzf apache-tomcat-8.5.34.tar.gz

mv apache-tomcat-8.5.34 /usr/local/tomcat/
Authorization chown -R www.www /usr/local/tomcat/

1. Configure server.xml
   Switch to / usr/local/tomcat/conf / Directory: cd /usr/local/tomcat/conf/

Rename the server.xml file: MV server.xml server.xml_k
Create a new server.xml file and run the command vi server.xml
Press the i key to enter the edit mode and add the following

<?xml version="1.0" encoding="UTF-8"?>
<Server port="8006" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/>
<Listener className="org.apache.catalina.core.AprLifecycleListener"/>
<GlobalNamingResources>
<Resource name="UserDatabase" auth="Container"
 type="org.apache.catalina.UserDatabase"
 description="User database that can be updated and saved"
 factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
 pathname="conf/tomcat-users.xml"/>
</GlobalNamingResources>
<Service name="Catalina">
<Connector port="8080"
 protocol="HTTP/1.1"
 connectionTimeout="20000"
 redirectPort="8443"
 maxThreads="1000"
 minSpareThreads="20"
 acceptCount="1000"
 maxHttpHeaderSize="65536"
 debug="0"
 disableUploadTimeout="true"
 useBodyEncodingForURI="true"
 enableLookups="false"
 URIEncoding="UTF-8"/>
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
  resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="/data/wwwroot/default" unpackWARs="true" autoDeploy="true">
<Context path="" docBase="/data/wwwroot/default" debug="0" reloadable="false" crossContext="true"/>
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log." suffix=".txt" pattern="%h %l %u %t &quot;%r&quot; %s %b" />
</Host>
</Engine>
</Service>
</Server>

Press Esc to exit editing mode, enter: wq to save and exit editing

1. Set JVM parameters
   Run the command vi /usr/local/tomcat/bin/setenv.sh to create / usr/local/tomcat/bin/setenv.sh.

Press the i key to enter the edit mode and add the following
JAVA_OPTS='-Djava.security.egd=file:/dev/./urandom -server -Xms256m -Xmx496m -Dfile.encoding=UTF-8'

1. Set the Tomcat self starting script.
   Download script:

wget https://github.com/lj2007331/oneinstack/raw/master/init.d/Tomcat-init
Rename Tomcat init: MV Tomcat init / etc / init.d/tomcat
Add execution permission: chmod +x /etc/init.d/tomcat
Run the following command to set the startup script Java home, and note the version number
sed -i 's@^export JAVA_HOME=.*@export JAVA_HOME=/usr/java/jdk1.8.0_191@' /etc/init.d/tomcat

1. Set self start

chkconfig --add tomcat
chkconfig tomcat on

1. Start Tomcat
   service tomcat start