如何在 Play 中组织 java 和 scala 代码？

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play-java 和play-scala 的解剖结构如下：

ls project-*/app
...-java/app:
controllers  filters  Filters.java  Module.java  services  views

...-scala/app:
controllers  filters  Filters.scala  Module.scala  services  views

根据this 文档：

您还可以选择使用 SBT 使用的默认布局和 马文。请注意，此布局是实验性的，可能有 问题。要使用此布局，您必须禁用该布局 插件并为旋转模板设置显式监控：

build.sbt                  → Application build script
src                        → Application sources
 └ main                    → Compiled asset sources
    └ java                 → Java sources
       └ controllers       → Java controllers
       └ models            → Java business layer
    └ scala                → Scala sources
       └ controllers       → Scala controllers
       └ models            → Scala business layer
    └ resources            → Configurations files and other non-compiled resources (on classpath)
       └ application.conf  → Main configuration file
       └ routes            → Routes definition

讨论

基于this answer 应该结合java 和scala 文件？例如：

合并

...-java/app/controllers:
AsyncController.java  CountController.java  HomeController.java

...-scala/app/controllers:
AsyncController.scala  CountController.scala  HomeController.scala

到

.../app/controllers
AsyncController.java  CountController.java  HomeController.java
AsyncController.scala  CountController.scala  HomeController.scala

这是结合 java 和 scala 类的 Play 剖析，还是应该在 app/controllers 文件夹中创建 java 和 scala 目录？

位于 scala 和 java 项目中的routes 文件是相同的：

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# An example controller showing a sample home page
GET     /                           controllers.HomeController.index
# An example controller showing how to use dependency injection
GET     /count                      controllers.CountController.count
# An example controller showing how to write asynchronous code
GET     /message                    controllers.AsyncController.message

# Map static resources from the /public folder to the /assets URL path
GET     /assets/*file               controllers.Assets.versioned(path="/public", file: Asset)

Answer 1

只需将您的 controllers 和 models 文件夹放入 app 文件夹，然后将 scala 和 java 文件都放入其中。

build.sbt            → Application build script
app                  → Application sources
 └ controllers       → controllers (java or scala)
 └ models            → business layer (java or scala)
 └ views             
public
conf
 └ application.conf  → Main configuration file
 └ routes            → Routes definition

Answer 2

你不需要特殊的“组合”布局——你可以在同一个包中使用 java 和 scala。

例子：

package controllers;

public class MyJavaClass {

  public static String getName(){
    return "My Name";
  }
}