更改默認播放框架HTTP端口（不使用系統屬性）

Question

有一個關於更改Play應用程序綁定到的HTTP端口的常見問題。 James Ward's answer通常被認爲是最完整的，但它涉及通過設置http.port系統屬性來覆蓋默認值。但是，是否可以更改此默認值，而無需在開發時手動將其添加到run命令中，調整環境或在運行時配置中打包重寫？

Answer 1

這可以通過設置playDefaultPort key來完成，如下所示：

import PlayKeys._ 
playDefaultPort := 9123 

之後，您就可以run和testProd無需記住所需的端口。

這個工作在兩種發展：

$ sbt run 
[info] Loading project definition from /Users/michaelahlers/Projects/MyApp/project 
[info] Set current project to MyApp (in build file:/Users/michaelahlers/Projects/MyApp/) 

--- (Running the application, auto-reloading is enabled) --- 

[info] p.c.s.NettyServer - Listening for HTTP on /0:0:0:0:0:0:0:0:9123 

(Server started, use Ctrl+D to stop and go back to the console...) 

和生產模式：

$ sbt testProd 
[info] Loading project definition from /Users/michaelahlers/Projects/MyApp/project 
[info] Set current project to MyApp (in build file:/Users/michaelahlers/Projects/MyApp/) 
[info] Packaging /Users/michaelahlers/Projects/MyApp/target/scala-2.11/MyApp_2.11-1.0.0-SNAPSHOT-web-assets.jar ... 
[info] Done packaging. 

(Starting server. Type Ctrl+D to exit logs, the server will remain in background) 

2016-04-08 13:09:45,594 [info] a.e.s.Slf4jLogger - Slf4jLogger started 
2016-04-08 13:09:45,655 [info] play.api.Play - Application started (Prod) 
2016-04-08 13:09:45,767 [info] p.c.s.NettyServer - Listening for HTTP on /0:0:0:0:0:0:0:0:9123