Maven getting started

It has been said that Maven is a project cycle management software for a long time, because the previous projects are not allowed to access the Internet, so Maven cannot be used to download jar packages. Now, after job hopping, you can directly use a leased line to connect to the Internet and finally have the chance to use Maven. Therefore, you can simply write the maven entry-level documents.

First, download Maven (because I use eclipse for coding in windows, so I download the Windows version of Maven ). Install the SDK directly after downloading it, and configure three environment variables:

1. maven_home = installation path (e. g C: \ apache-maven-3.0)

2. MAVEN = % maven_home % \ bin

3. Add % maven_home % To the PATH variable.

OK. Enter MVN-V in cmd. If you see

++ ++

C: \ Users \ Eric> MVN-version
Apache Maven 3.0.3 (r00005438; 01:31:09 + 0800)
Maven home: D: \ Program Files (x86) \ apache-maven-3.0.3
Java version: 1.7.0, vendor: Oracle Corporation
Java home: C: \ Program Files \ Java \ jdk1.7.0 \ JRE
Default locale: zh_cn, platform encoding: GBK
OS name: "Windows 7", version: "6.1", arch: "amd64", family: "Windows"

++ ++

The installation is successful.

Deploy the first Maven project. Create a Maven project in eclipse.

This is the configured Pom. XML content.

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 2   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 3   <modelVersion>4.0.0</modelVersion> 4  5   <groupId>org.andy.maven</groupId> 6   <artifactId>MavenTest</artifactId> 7   <version>0.0.1-SNAPSHOT</version> 8   <packaging>jar</packaging> 9 10   <name>MavenTest</name>11   <url>http://maven.apache.org</url>12 13   <properties>14     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>15   </properties>16 17   <dependencies>18     <dependency>19       <groupId>junit</groupId>20       <artifactId>junit</artifactId>21       <version>3.8.1</version>22       <scope>test</scope>23     </dependency>24   </dependencies>25 </project>

We compile a Java class

 1 package org.andy.maven.MavenTest; 2  3 public class MyMavenTest { 4  5     public String getString(String s){ 6         System.out.println("In the getString the para is "+s); 7         return "SUCCESS"; 8     } 9     10     public static void main(String[] args) {11         // TODO Auto-generated method stub12         System.out.println("In the main is OK");13     }14 15 }

Right-click Pom. xml and choose run as> Maven build. Input "clean compile" in goals, indicating that the file is cleared first and then compiled again ).

 1 [INFO] Scanning for projects... 2 [INFO]                                                                          3 [INFO] ------------------------------------------------------------------------ 4 [INFO] Building MavenTest 0.0.1-SNAPSHOT 5 [INFO] ------------------------------------------------------------------------ 6 [INFO]  7 [INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ MavenTest --- 8 [INFO] Deleting D:\scala-workspace\MavenTest\target 9 [INFO] 10 [INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ MavenTest ---11 [debug] execute contextualize12 [INFO] Using ‘UTF-8‘ encoding to copy filtered resources.13 [INFO] skip non existing resourceDirectory D:\scala-workspace\MavenTest\src\main\resources14 [INFO] 15 [INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ MavenTest ---16 [INFO] Compiling 1 source file to D:\scala-workspace\MavenTest\target\classes17 [INFO] ------------------------------------------------------------------------18 [INFO] BUILD SUCCESS19 [INFO] ------------------------------------------------------------------------20 [INFO] Total time: 2.027s21 [INFO] Finished at: Mon Jul 21 21:52:08 CST 201422 [INFO] Final Memory: 9M/23M23 [INFO] ------------------------------------------------------------------------

The 18 lines indicate that Maven has been compiled successfully.

Maven commands in Eclipse:

Maven clean -- clear the current project

Maven build -- execute Maven commands

Maven install -- generate a jar package

Update Project -- If you modify the dependency information in POM (e. g version, add/delete jar packages, etc.), update the current project