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资源说明：A sample project illustrating Maven modules
TABLE OF CONTENTS 1. Background 2. Checking Out and Importing into Eclipse 3.7.1 3. Running the webapp ------------- 1. Background ------------- This project illustrates the use of Maven modules to separate layers and/or concerns into individual projects. In this example, the parent project is mav-mod. Its modules are: - mav-mod-model - mav-mod-persistence - mav-mod-service - mav-mod-webapp As it happens in this example, mav-mod-persistence includes mav-mod-model as a dependency; mav-mod-service includes mav-mod-persistence as a dependency; and mav-mod-webapp includes mav-mod-service as a dependency. When you look at each module's pom.xml file, you will notice that it has a restricted number of dependencies -- typically only those dependencies that it needs but cannot find in any of the module(s) it includes. Therefore, mav-mod-model includes only those dependencies it needs, which are few -- essentially JUnit and logging dependencies. Because mav-mod-persistence includes mav-mod-model as a dependency, it inherits JUnit and the logging dependencies. It adds a few new depenencies of its own, such as Spring. Likewise, because mav-mod-service includes mav-mod-persistence as a dependency, it inherits all of mav-mod-persistence's dependencies, which include all of mav-mod-model's dependencies. It adds a few of its own dependencies. Finally, because mav-mod-webapp includes mav-mod-service as a dependency, it inherits all of mav-mod-service's dependencies. Because it already has so many inherited dependencies, it only needs to define the dependencies it can't find in the other modules. Note that when you add a testing dependency library, such as JUnit, to a module, do not set its scope to "test" if you want other modules to inherit that library when they refer to the module including the testing library. ------------------------------------------------ 2. Checking Out and Importing into Eclipse 3.7.1 ------------------------------------------------ Through trial and error, I figured out how to check out this application so that it displays in Eclipse non-hierarchically, and so that you can use Team -> Synchronize Workspace to interact with Git. By "non-hierarchically", I mean that the parent project and all of the modules appear as separate projects in Eclipse, rather than only the parent project appearing, with a folder for each module inside that project. Follow these steps (there may be other ways, but this should work): A. Clone the mav-mod Git Repository 1. Select File -> Import... -> Git/Projects from Git 2. Click Next, and click Clone... 3. Enter or paste the URI from GitHub and click Next, and then Next again 4. Click Browse to select a directory in which to install the app. 5. Click Next, and then click Finish 6. In the Select a Git Repository, click Cancel. These steps simply clone the Git repository for the mav-mod application. B. Import mav-mod into Eclipse 1. In the Git Repositories tab, expand the mav-mod Git clone. 2. Right-click on Working Directory and select Import Projects... 3. Choose Import as general project. 4. Click Next, and then click Finish. 5. Right-click on the mav-mod project and select Team -> Synchronize Workspace to verify that you can use eGit directly on the project C. Force Eclipse to Display mav-mod and its Modules Separately Repeat the following steps once for each module of the mav-mod project. 1. Select File -> Import... 2. Select Maven/Existing Maven Projects 3. Click Next, and Browse to select mav-mod/mav-mod-model (or one of the other modules) 4. Click Finish When you have completed all these steps, you should see five projects in your Eclipse Project Explorer or Package Explorer. mav-mod mav-mod-model mav-mod-persistence mav-mod-service mav-mod-webapp You will not be able to do Team -> Synchronize Workspace from the modules, but you can do so from mav-mod (the parent), and the it will show changes you've made in the modules. To verify this, make a minor change in one of the modules, and then select Team -> Synchronize Workspace to see that eGit knows you've made a change. --------------------- 3. Running the Webapp --------------------- The mav-mod-webapp can be run in either Resin or Tomcat. Once the app is up and running, you can access it with this URL: http://localhost:/mav-mod-webapp/
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