Use the maven maven of the java

Here are the tools used myeclipse, so here is talking about the use maven on myeclipse.

1. What is a warehouse?

It used to store dependencies, configuration files, other plug-ins.

When items are added dependent on, the default read dependencies from the local warehouse, local warehouse if no relevant dependence,

maven downloads from a distance warehouse and placed to local warehouse.

2. What is maven coordinates?

maven coordinates for uniquely identifying dependencies or project.

Commonly used maven coordinates: groupId, artifactId, version.

Other maven coordinates, such as: scope, classifier

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <!--所有的Maven项目都必须配置这四个配置项-->
    <modelVersion>4.0.0</modelVersion>
    <!--groupId指的是项目名的项目组，默认就是包名-->
    <groupId>cn.gacl.maven.hello</groupId>
    <!--artifactId指的是项目中的某一个模块，默认命名方式是"项目名-模块名"-->
    <artifactId>hello-first</artifactId>
    <!--version指的是版本，这里使用的是Maven的快照版本-->
    <version>SNAPSHOT-0.0.1</version>
</project>

3.怎么知道maven坐标？

网址： https://mvnrepository.com/artifact/junit/junit/4.13-beta-3 ，如图

4. 怎样使用 myeclipse 创建 maven 项目？

首先，在空白处，右键，new ---> other

然后，选择 Maven Project ---> Next

勾选创建简单项目----> Next

填写坐标，如图：

生成的，默认项目目录及文件说明，如图：

5. 添加依赖运行测试

a. 修改 pom.xml , 添加 junit 依赖

b. 编写测试类

在如下位置，添加 HelloWorld.java 类

Helloworld.java

package mvn_helloworld;

import org.junit.Test;

public class HelloWorld {

    @Test
    public void hello(){
        System.out.println("hello world");
    }
}

c. 运行测试类，效果如下

Use the maven maven of the java

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