blocks|key|2260694|text|您可以通过以下方式访问当前应用程序|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2260695|play.api.Play.current()|code-block|syntax|javascript|2260696|要找出模式，请尝试|2260697|play.api.Play.current().mode()|2260698|或者简单地使用|2260699|play.api.Play.isDev(play.api.Play.current())|2260700|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You can access the current Appliction via

<pre><code>play.api.Play.current()
</code></pre>

to find out the mode try

<pre><code>play.api.Play.current().mode()
</code></pre>

or simply use

<pre><code>play.api.Play.isDev(play.api.Play.current())
</code></pre>

blocks|key|2260708|text|在play+2.3.X中，您还可以通过以下方式检查：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2260709|play.Play.isProd()
play.Play.isDev()
play.Play.isTest()|code-block|syntax|javascript|2260710|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In play 2.3.X you can also check via:

<pre><code>play.Play.isProd()
play.Play.isDev()
play.Play.isTest()
</code></pre>

blocks|key|2260751|text|在Play+2.5.x中，不推荐使用play.Play.isDev()方法，必须使用依赖注入|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2260752|import+javax.inject.Inject;

public+class+Example+{

++++@Inject
++++private+play.Environment+environment;

++++public+void+myMethod()+{
++++++++if+(environment.isDev())+{
++++++++++...
++++++++}
++++}
}|code-block|syntax|javascript|2260753|或在Scala中等效：|2260754|class+ErrorHandler+@Inject()(environment:+Environment)+{

++def+myMethod()+=+{
++++if+(environment.isDev)+{
++++++...
++++}
++}

}|2260755|environment.isDev()返回一个布尔值，它可以很容易地传递给一个模板。不需要像描述的这里那样使用隐式变量。|2260756|entityMap|0|LINK|mutability|MUTABLE|url|https://www.playframework.com/documentation/2.5.x/JavaDependencyInjection|1|https://stackoverflow.com/a/32971028/873282^0|I|H|16|4|0|0|0|0|0|0|J|1D|2|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|18|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|Q|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|Z]]]]

In Play 2.5.x the <code>play.Play.isDev()</code> method is deprecated, one has to use <a href="https://www.playframework.com/documentation/2.5.x/JavaDependencyInjection" rel="noreferrer">dependency injection</a>:

<pre><code>import javax.inject.Inject;

public class Example {

 @Inject
 private play.Environment environment;

 public void myMethod() {
 if (environment.isDev()) {
 ...
 }
 }
}
</code></pre>

Or equivalently in Scala:

<pre><code>class ErrorHandler @Inject()(environment: Environment) {

 def myMethod() = {
 if (environment.isDev) {
 ...
 }
 }

}
</code></pre>

<code>environment.isDev()</code> returns a Boolean, which one can easily pass to a template. No need to use implicit variables as described <a href="https://stackoverflow.com/a/32971028/873282">here</a>.

blocks|key|1470582|text|在使用Scala的Play+2.5中，有一个context.environment.mode值来自play.api.Mode，其中一个值为Dev,+Test,+Prod。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1470583|对于编译时依赖注入，应用程序加载程序中有可用的context，如果扩展BuiltInComponentsFromContext，则可以直接使用(注入)+environment.mode。|1470584|entityMap^0|M|O|1D|D|1X|F|0|N|7|Z|S|24|G|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|I|$]]

In Play 2.5 using Scala there is a <code>context.environment.mode</code> value of <code>Enumeration</code> from <code>play.api.Mode</code> with one of the values <code>Dev, Test, Prod</code>. 
For compile time dependency injection you have <code>context</code> available in your app loader and if you extend <code>BuiltInComponentsFromContext</code> then you can use (inject) directly <code>environment.mode</code>

blocks|key|1470613|text|使用Play+2.5，Play+2.6和Play+2.7|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1470614|你可以这样做：|1470615|import+play.Environment

class+MyController+@Inject()(env:+Environment)+{

++println(s"DevMode+is+${env.isDev}")
++println(s"ProdMode+is+${env.isProd}")
++println(s"TestMode+is+${env.isTest}")

}|code-block|syntax|javascript|1470616|或者在Play+2.6和Play+2.7中，您也有关于play.api.Environment的版本|CODE|1470617|import+play.api.Environment

class+MyController+@Inject()(env:+Environment)+{

++println(s"ProdMode+is+${env.mode+==+Mode.Prod}")
++println(s"DevMode+is+${env.mode+==+Mode.Dev}")
++println(s"TestMode+is+${env.mode+==+Mode.Test}")
}|1470618|Scala声明：|1470619|/**
+*+The+environment+for+the+application.
+*
+*+Captures+concerns+relating+to+the+classloader+and+the+filesystem+for+the+application.
+*/|1470620|entityMap^0|2|8|B|8|K|8|0|0|0|3|8|C|8|R|K|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|O]]|D|@]|E|$]]|$1|P|3|Q|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|R|3|S|5|6|7|1E|8|@]|D|@]|E|$]]|$1|T|3|U|5|J|7|1F|8|@]|D|@]|E|$K|L]]|$1|V|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|W|$]]

With Play 2.5, Play 2.6 and Play 2.7

You can do it like this:

<pre><code>import play.Environment

class MyController @Inject()(env: Environment) {

 println(s"DevMode is ${env.isDev}")
 println(s"ProdMode is ${env.isProd}")
 println(s"TestMode is ${env.isTest}")

}
</code></pre>

Or in Play 2.6 and Play 2.7 you have also the version with <code>play.api.Environment</code>:

<pre><code>import play.api.Environment

class MyController @Inject()(env: Environment) {

 println(s"ProdMode is ${env.mode == Mode.Prod}")
 println(s"DevMode is ${env.mode == Mode.Dev}")
 println(s"TestMode is ${env.mode == Mode.Test}")
}
</code></pre>

For both the Scala Doc states:

<pre><code>/**
 * The environment for the application.
 *
 * Captures concerns relating to the classloader and the filesystem for the application.
 */
</code></pre>

blocks|key|2260823|text|在Play+2.6中，注入一个Environment实例并使用它的mode字段：play.api.Mode枚举值之一。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|2260824|import+javax.inject.Inject
import+play.api.Environment
import+play.api.Mode.Prod
import+play.api.mvc.{AbstractController,+ControllerComponents}

class+TestController+@Inject()(cc:+ControllerComponents,+env:+Environment)
++++extends+AbstractController(cc)+{

++def+hello+=+Action+{
++++if+(env.mode+==+Prod)+{
      //+...
++++}

++++Ok(s"Hello+world+in+${env.mode}+mode")
++}

}|code-block|syntax|javascript|2260825|至少在发挥2.6.20，方法env.isDev，env.isProd等，pme提到，不再起作用。|2260826|entityMap|0|LINK|mutability|MUTABLE|url|https://www.playframework.com/documentation/2.0/api/scala/play/api/Mode$.html|1|https://stackoverflow.com/a/49150232/56285^0|1|8|F|B|X|4|14|D|14|D|0|0|0|E|9|O|A|10|5|1|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|D]|$9|12|A|13|B|D]|$9|14|A|15|B|D]]|E|@$9|16|A|17|1|18]]|F|$]]|$1|G|3|H|5|I|7|19|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|1A|8|@$9|1B|A|1C|B|D]|$9|1D|A|1E|B|D]]|E|@$9|1F|A|1G|1|1H]]|F|$]]|$1|N|3|-4|5|6|7|1I|8|@]|E|@]|F|$]]]|O|$P|$5|Q|R|S|F|$T|U]]|V|$5|Q|R|S|F|$T|W]]]]

In Play 2.6, inject an <code>Environment</code> instance and use its <code>mode</code> field: one of <a href="https://www.playframework.com/documentation/2.0/api/scala/play/api/Mode$.html" rel="nofollow noreferrer"><code>play.api.Mode</code></a> enum values.

<pre><code>import javax.inject.Inject
import play.api.Environment
import play.api.Mode.Prod
import play.api.mvc.{AbstractController, ControllerComponents}

class TestController @Inject()(cc: ControllerComponents, env: Environment)
 extends AbstractController(cc) {

 def hello = Action {
 if (env.mode == Prod) {
      // ...
 }

 Ok(s"Hello world in ${env.mode} mode")
 }

}
</code></pre>

At least in Play 2.6.20, the methods <code>env.isDev</code>, <code>env.isProd</code>, etc, <a href="https://stackoverflow.com/a/49150232/56285">mentioned by pme</a>, no longer work.

From within a Play 2.1 application, how would I programmatically determine which mode the application is running in (i.e., Development vs. Production)?

For example, it would be useful to be able to do something like this from inside a template:

<code>&lt;p&gt;@if(__some_play_API_call__ == Dev) { &lt;b&gt;Development mode&lt;/b&gt; }&lt;/p&gt;</code>

In the Play 2.0 API documentation, there appears to be a <code>mode</code> property of the <code>play.api.Application</code> class... however, I am unsure about how to get at the instance of the currently running application.

How to detect application mode in Play 2.x

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Play 2.1应用程序中，如何以编程方式确定应用程序在哪种模式下运行(即开发与生产)？例如，能够在模板中执行这样的操作是有用的：@if(__some_play_API_call__ == Dev) { Development mode }在Play 2.0API文档中，似乎有一个mode...

问如何在Play 2.x中检测应用程序模式
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