To run maven, you must have a JDK, which is written in the Java language

I. installation of JDK

Download on ORACLE official websiteJDK jdk-8u231-linux-x64.tar.gz

Upload JDK to linux server

create folder

[root@VM_0_17_centos /]# cd /opt
[root@VM_0_17_centos opt]# mkdir jdk

Using xftp tool to upload compressed files

• Connecting to a Linux server

• Error is reported after entering IP address and login information: unable to connect with IP, It is found that the protocol is wrong. SFTP should be selected

• If the folder permission is not enough, the file upload may fail, and the folder permission needs to be modified

# Modify opt folder permissions
chmod 777 /opt  
# Permission to modify the opt folder and its subdirectories
chmod -R 777 /opt  

Install JDK

Unzip the file after uploading successfully

[root@VM_0_17_centos jdk]# tar -zxvf jdk-8u231-linux-x64.tar.gz 
[root@VM_0_17_centos jdk]# ll
total 189608
drwxr-xr-x 7   10  143      4096 Oct  5 18:13 jdk1.8.0_231
-rw-r--r-- 1 root root 194151339 Nov  6 20:07 jdk-8u231-linux-x64.tar.gz

Configure JDK environment variables

 [root@VM_0_17_centos jdk]# vi /etc/profile
# Enter vi mode, input two big G, and locate to the end of the file

• Appended variable

Enter i to enter edit mode

export JAVA_HOME=/opt/jdk/jdk1.8.0_231
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

Press Esc, enter: wq save and exit vi

• Make environment variables effective

[root@VM_0_17_centos jdk]# source /etc/profile

• Check whether the JDK is effective

[root@VM_0_17_centos jdk]# java -version
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)

II. Installation of maven

Download maven Apache Maven 3.6.2

Download maven

• linux uses wget command to download maven

[root@VM_0_17_centos opt]# mkdir maven
[root@VM_0_17_centos opt]# cd maven
[root@VM_0_17_centos maven]# wget http://mirrors.tuna.tsinghua.edu.cn/apache/maven/maven-3/3.6.2/binaries/apache-maven-3.6.2-bin.tar.gz

Create a folder and switch to the directory. wget will download the file corresponding to the address to the directory

Install maven

• Unzip the installation file

[root@VM_0_17_centos maven]# ls
apache-maven-3.6.2-bin.tar.gz
[root@VM_0_17_centos maven]# tar -zxvf apache-maven-3.6.2-bin.tar.gz 

• Create a soft connection to the apache-maven-3.6.2 directory

[root@VM_0_17_centos maven]# ln -s apache-maven-3.6.2 maven
[root@VM_0_17_centos maven]# ll
total 8936
drwxr-xr-x 6 root root    4096 Nov  6 21:40 apache-maven-3.6.2
-rw-r--r-- 1 root root 9142315 Sep  3 05:43 apache-maven-3.6.2-bin.tar.gz
lrwxrwxrwx 1 root root      18 Nov  6 21:43 maven -> apache-maven-3.6.2

Configure maven environment

export M2_HOME=/opt/maven/maven
export PATH=$M2_HOME/bin:$PATH

• Make environment variables effective

[root@VM_0_17_centos maven]# source /etc/profile

• Check whether maven is effective

[root@VM_0_17_centos maven]# mvn -v
Apache Maven 3.6.2 (40f52333136460af0dc0d7232c0dc0bcf0d9e117; 2019-08-27T23:06:16+08:00)
Maven home: /opt/maven/maven
Java version: 1.8.0_231, vendor: Oracle Corporation, runtime: /opt/jdk/jdk1.8.0_231/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.10.0-957.21.3.el7.x86_64", arch: "amd64", family: "unix"

Configure setting.xml

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">


  <localRepository>/opt/maven/repository</localRepository>

  <pluginGroups>


  </pluginGroups>

  <proxies>

  </proxies>

  <servers>

  </servers>


  <mirrors>
    <mirror>
        <id>alimaven</id>
        <name>aliyun maven</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
        <mirrorOf>central</mirrorOf>
    </mirror>
    <mirror>
        <id>ui</id>
        <mirrorOf>central</mirrorOf>
        <name>Human Readable Name for this Mirror.</name>
        <url>http://uk.maven.org/maven2/</url>
    </mirror>
    <mirror>
        <id>jboss-public-repository-group</id>
        <mirrorOf>central</mirrorOf>
        <name>JBoss Public Repository Group</name>
        <url>http://repository.jboss.org/nexus/content/groups/public</url>
    </mirror>
    <mirror>
        <id>repo2</id>
        <mirrorOf>central</mirrorOf>
        <name>Human Readable Name for this Mirror.</name>
        <url>http://repo2.maven.org/maven2/</url>
    </mirror>
    <mirror>
        <id>OSChina</id>
        <name>OSChina Central</name>
        <url>http://maven.oschina.net/content/groups/public/</url>
        <mirrorOf>central</mirrorOf>
    </mirror>
    <mirror>
        <id>nexus-osc-thirdparty</id>
        <mirrorOf>thirdparty</mirrorOf>
        <name>Nexus osc thirdparty</name>
        <url>http://maven.oschina.net/content/repositories/thirdparty/</url>
    </mirror>
  </mirrors>


  <profiles>
    <profile>    
        <id>jdk-1.8</id>    
        <activation>    
            <activeByDefault>true</activeByDefault>    
            <jdk>1.8</jdk>    
        </activation>    
        <properties>    
            <maven.compiler.source>1.8</maven.compiler.source>    
            <maven.compiler.target>1.8</maven.compiler.target>    
            <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>    
        </properties>    
    </profile> 
  </profiles>


</settings>