先把命令行切换到Maven项目的根目录，比如：/d/xxxwork/java/maven-test，然后执行命令：
mvn clean compile
执行结果如下：
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building rtp-front 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ rtp-front ---
[INFO] Deleting D:\xxxwork\Java\maven-test\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ rtp-front ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ rtp-front ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
[INFO] Compiling source files to D:\CtripWork\Java\maven-test\target\classes
[WARNING] /D:/xxxwork/Java/maven-test/src/main/java/ReadOnly.java: 某些输入文件使用了未经检查或不安全的操作。
[WARNING] /D:/xxxwork/Java/maven-test/src/main/java/ReadOnly.java: 有关详细信息, 请使用 -Xlint:unchecked 重新编译。
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 11.500 s
[INFO] Finished at: --14T15::+:
[INFO] Final Memory: 13M/76M
[INFO] ------------------------------------------------------------------------
执行顺序：
1、使用清理插件：maven-clean-plugin:2.5执行清理删除已有target目录（版本2.5）；
2、使用资源插件：maven-resources-plugin:2.6执行资源文件的复制等（版本2.6）；
3、使用编译插件：maven-compiler-plugin:3.1编译所有源文件生成class文件至target\classes目录下（版本3.1）；
4、整个编译过程完成。