使用 Play 从 java 类访问 application.conf 属性！ 2.0

Question

I want to add an object to the Global scope, and in order to construct it I need to pass it a path to a file. I don't want to hard code the file path in the source, and so I want to get that path from the application.conf.

The problem is that I don't know how to access these properties from the java class. I tried this:

Configuration.root().getString("file.path")

But it ends with a NullPointerException .

Am I wrong in assuming that there's a global Configuration instance that I can use? Thanks.

Answer 1

Try Play.application().configuration().getString("your.key")

As noted in the comment (nico_ekito), please use play.Play and not play.api.Play . play.api.Play is for scala controllers (see comment by Marcus biesior Biesioroff)

Additionally, play uses https://github.com/typesafehub/config under the hood so it can also provide some insights.

Answer 2

Even if it seems simple, here is the scala way to get properties from configuration file :

Play 2.0 and 2.1 :

import play.api.Play.current
...
Play.application.configuration.getString("your.key")

Play 2.2 and +

import play.api.Play.current
...
current.configuration.getString("your.key")

Using Typesafe config

import com.typesafe.config.ConfigFactory
...
ConfigFactory.load().getString("your.key");

Answer 3

From Play 2.4 and + it is better to use dependency injection to access Configurations:

import play.Configuration;
import javax.inject.Inject;


@Inject
private Configuration configuration;

...

String value = configuration.getString("your.key");

Answer 4

由于 Play 2 使用了 Typesafe 配置库，因此我在 application.conf 中访问了我的变量，如下所示：

ConfigFactory.load().getString("my.var");

Answer 5

In the play java is:

import play.Play;
...
Play.application().configuration().getString("key")

Answer 6

Use as following (Tested in Play 1.2.5)

${play.configuration.getProperty('my.var')}

where my.var should be specified in application.conf file

Answer 7

作为从模板访问它的参考（用于播放 < 2）

play.configuration['your.key']

Answer 8

As folks have mentioned, Play.application.configuration no longer exists.

In Play Scala 2.3.x, to read a value from conf/application.conf , you can do the following:

import play.api.Play.current
...
current.configuration.getString("key")

Answer 9

In Play 1.2.x

import play.Play;
...


String version  = Play.configuration.getProperty("application.version.number", "1.1.1");

where the second parameter is the default value

Answer 10

Import this

import com.typesafe.config.Config;

and write the below lines

private Config config;
this.config = ConfigProvider.config();
String value = this.config.getString("fieldFromConfigFile");

Answer 11

import play.Play; String myVal = Play.configuration.getProperty("your.key").toString();

i use this in my app and it works

Dont forget to import play.Play. Hope it'll gives you help

Answer 12

从版本 2.5 开始，请使用应该注入的 play.Application 类，然后使用application.config().getString("your.property.here")

Answer 13

For Java Playframework:

In Application.conf , you can put something like that:

email="example@gmail.com.pe"

some class:

import play.Play;

String email = Play.application().configuration().getString("key") // key ->email