What is Maven
Project management tools, including a project object model (POM Project Object Model)
Maven can solve any problem
1.jar packet collision
2.Java compiled into a binary file byte code class files
3. prompt code errors, reduce bugs
4. Packing
Maven advantage
Core functions:
1. dependency management , process management is Maven jar package.
Occupy a large memory traditional web project developed CRM projects compiled, jar package in the project.
Maven development of the project jar package is not in the project, but in the jar package repository, quoted by the jar package coordinates. Maven saving disk space to meet the requirements of the code reusable.
2. a key building
projects will be built, test, run, packaging, installation and deployment of a series of processes.
These processes are carried out to Maven, is a key building.
jar package coordinates in the pom.xml
copy Maven Maven project execution path DOS command window open
mvn tomcat: run program run directly up
Maven installation
Configuring maven
Automated build tools
Make "Ant" Maven "Gradle
clean up the
compiled
test
report
package
to deploy
its own configuration maven
Download maven . Unzip to the specified directory, configuration environment variable.
Note: Win10 system mvn -version command is not an internal command nor the program can be run, you can simply delete brutal MAVEN_HOME, adding bin path (such as D: \ NEW \ apache-maven -3.6.3 \ bin) directly on the Path.
IDEA configuration:
After configuring the parameters even broken network can also create project maven
settings.xml can be configured: for example warehouses address.
If there is no local repository download will go to the central warehouse, the company can create a remote repository (PW) yourself, you can download via the LAN to the PW.
After modifying pom.xml real-time download, source code and documentation do not automatically download, do not change the basic memory allocation.
Maven standard directory structure
Project can be divided into:
- Part of the core code
- Profile section
- Test code section
- Test the profile
Maven project standard directory structure
src / main / java directory: core code part
src / main / resources directory: Profiles section
src / test / java directory: test code section
src / test / resources directory: test configuration file
src / main / webapp page resources, js, css, images, etc. (if the project is JavaWeb)
Common Commands
mvn clean： 删除target目录
mvn compile：编译
mvn test：测试，test和正式的都会重新编译
mvn package：打包，打出来的包放在target下，pom.xml下package标签指定类型。
mvn install：正式测试都编译，打包后会把包放到本地仓库。
mvn deploy：发布
Maven生命周期
默认生命周期
编译compile》测试test》打包package》安装install》发布deploy
越往后面执行命令时，前面会重新执行一遍。
清理生命周期
清理clean
站点生命周期
实际开发用的不多
双击执行命令，生命周期外的命令可以按图示操作：
概念模型图
项目对象模型：项目自身信息
项目运行依赖的jar包信息
项目运行环境信息，比如jdk、Tomcat
依赖管理模型
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.2</version>
</dependency>
三个最基本信息公司组织名称，项目名，版本号
默认生命周期：compile，test，package，install，deploy
每个构建项目命令对应Maven底层的一个插件
IDEA集成Maven
前期：已经安装好Maven工具，配置完成。
new project，如果使用骨架可以按图示勾选，然后继续选择下面的，例如quickstart
如果main下没有resource文件夹，可以自己创建然后：
推荐不使用骨架
Create a web project
on the main Java to create a folder, then right mark as source root can be.
IDEA each file folder to place very strict requirements
Resolve conflict jar package
Maven JAR package conflicts troubleshooting and solutions (focus)
plus scope scoped
编译时不起作用
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
只在测试时起作用
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
maven project to modify the operating environment
Tomcat7 can be run directly by the mvn command: run
Learn finishing in Maven Basics (IDEA version)
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