先看看目录结构：
这是本来的项目目录结构，由于maven有自己的目录结构，所以，下面的是加入maven元素后的目录结构：
即：
文件要和src目录在同一级
NOTE:
你所看到的有红色X标示错误提示，这是在Eclipse中的提示，这个可以不用理会。
接下来才是关键：
4.0.0
com.b510.maven.hello
hello-first
SNAPSHOT-0.0.1
junit
junit
4.10
copetestcope
pom.xml文件，是project object manager的首字母缩写。即项目对象管理。
在pom.xml文件中，对于我们写的com.b510.maven.hello.Hello.java类，他的groupId = com.b510.maven.hello,artifactId = hello-first,version = SNAPSHOT-0.0.1
而我们的测试类，所依赖的包为junit，它属于test域。
下面是Hello类和HelloTest类
System.out.println("This is a test message!" String str = Hello().sayHello("Hongten",20 stem.out.println(str);
String sayHello(String name, "I'm " + name + ",I'm " + age + ",Hello" }
org.junit.Assert.*
Hello hello = assertEquals(hello.sayHello("Hongten",20),"I'm Hongten,I'm 20,Hello"
}
两个类都是很简单的类。
现在我们启动windows的控制台。即运行--> cmd，或Ctrl+R --> cmd
进入到项目的根目录：D:\Development\workspace\maven_project
由于我们本地仓库中没有编译所需要的资源，所有，maven会到远程仓库中去获取资源到本地
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