如何通过gradle打包REST客户端代码以实现多项目使用(How to package REST Client code via gradle for multi-project usage)

 背景： 
 
 在多项目（比如Alpha和Beta）Java / Spring4.x环境中，Project Alpha需要在Project Beta中使用REST端点。 项目Alpha和Beta非常相关，将始终一起发布。 但是，它们也需要分开，因为代码将被构建到不同的部分中，这些部分将在不同的物理机器上执行 - 因此首先是REST实现！ 
 
 稍微侧重点：UI代码在其他项目中，通常是各种REST端点的使用者，因此不需要使用REST客户端的Java实现。 REST客户端通常是src / main / test，因此它们甚至不打包，通常它们仅为单元测试创​​建。 
 
 具体细节： 
 
 给定的API在Project Beta中通过Interface类定义： 
 
// located in /src/main/java/com/mycompany/myservice/api
public interface MyServiceApi {
    String getDataMethod();
}
 
 Java REST Client目前也在Project Beta中（需要上面的API）： 
 
// currently located in /src/main/client/com/mycompany/myservice/client
public class MyServiceRestClient implements MyServiceApi {
    . . . 
}
 
 问题： 
 
 对不起，花了这么长时间才来到这里！ 两个项目都在相同的settings.gradle文件中定义 - 它们是一起构建的。 每个项目也有自己的build.gradle文件。 问题是如何只打包客户端REST工件，然后如何在Project Alpha中引用它们？ 理想情况下，答案既可以使用gradle命令行，也可以使用Eclipse。 显然，在Project Alpha的build.gradle中使用它： 
 
dependencies {
    compile project('beta')
}
 
 不起作用，因为它带来了所有的项目Beta。 通过将客户端Java代码放入src / main / client ，我一直假设Project Beta需要定义一个sourceSet来处理这段代码。 我如何把它打包成一个Jar（我知道如何做这个部分）， 最重要的是 ，从Project Alpha中引用Jar在同一个单项多项目gradle构建中？ 或者，有更好的方法可以完全采用不同的方法吗？ 

Background:
 
In a multi-project (say Alpha and Beta) Java/Spring4.x environment where Project Alpha needs to use a REST endpoint in Project Beta. Projects Alpha and Beta ARE very related and will always be released together. However, they also need to be separate as the code will be built into different pieces that will execute on different physical machines - hence the REST implementation in the first place!
 
Slight side-point: The UI code is in other projects and is usually the consumer of the various REST endpoints and thus does not need to consume Java implementations of a REST Client. The REST Clients are usually src/main/test so they are not even packaged, generally they are only created for Unit Tests.
 
Specifics:
 
The given API is defined in Project Beta via an Interface class:
 
// located in /src/main/java/com/mycompany/myservice/api
public interface MyServiceApi {
    String getDataMethod();
}
 
The Java REST Client is also currently in Project Beta (needs the API above):
 
// currently located in /src/main/client/com/mycompany/myservice/client
public class MyServiceRestClient implements MyServiceApi {
    . . . 
}
 
The Question:
 
Sorry it has taken so long to get here! Both projects are defined in the same settings.gradle file - they are built together. Each project also has its own build.gradle file. The question is how to package only the client REST artifacts and then how to refer to them in Project Alpha? Ideally, the answer will work both from the gradle command line as well as within Eclipse. Clearly, using this in Project Alpha's build.gradle:
 
dependencies {
    compile project('beta')
}
 
does not work as that brings in ALL of project Beta. By putting the client Java code into src/main/client, I have been assuming Project Beta will need to define a sourceSet to process this code. How do I take that, package it into a Jar (I know how to do this part), AND MOST IMPORTANTLY, reference that Jar from Project Alpha all in the same, single multi-project gradle build? Or is there a much better way to do that is a different approach entirely?

原文：https://stackoverflow.com/questions/26382845