作用

将非Eclipse（如IDEA）创建的项目转为eclipse可以装配的项目，而且目录结构保持原样。

$ mvn eclipse:eclipse
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------------< xyz.cglzwz:bookmanagement >----------------------
[INFO] Building bookmanagement Maven Webapp 1.0-SNAPSHOT
[INFO] --------------------------------[ war ]---------------------------------
[INFO]
[INFO] >>> maven-eclipse-plugin:2.10:eclipse (default-cli) > generate-resources @ bookmanagement >>>
[INFO]
[INFO] <<< maven-eclipse-plugin:2.10:eclipse (default-cli) < generate-resources @ bookmanagement <<<
[INFO]
[INFO]
[INFO] --- maven-eclipse-plugin:2.10:eclipse (default-cli) @ bookmanagement ---
[INFO] Using Eclipse Workspace: null
[INFO] Adding default classpath container: org.eclipse.jdt.launching.JRE_CONTAINER
[INFO] Not writing settings - defaults suffice
[INFO] Wrote Eclipse project for "bookmanagement" to C:\Users\Administrator\Desktop\Book-management-master.
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.091 s
[INFO] Finished at: 2018-11-14T23:10:45+08:00
[INFO] ------------------------------------------------------------------------

生成以下两个eclipse的关键文件 .classpath, .project

这是maven项目，这样之后通过 File -> open project from file system 导入可以保持项目结构。

注意

1. maven项目也可以不使用 mvn eclipse:eclipse 来生成配置文件，可以直接在集成maven插件的eclipse里 File->import 通过maven项目的方式导入。也是可以的，推荐。
2. maven项目或者其他类型项目如果不这样做，那么导入即便成功，目录结构变了,变成普通的Java项目结构。比如maven项目这样导入以后可执行文件目录变成了bin目录。