试用配置管理库typesafe.config
Typesafe的Config库，纯Java写成、零外部依赖、代码精简、功能灵活、API友好。支持Java properties、JSON、JSON超集格式HOCON以及环境变量。它也是Akka的配置管理库.
Overview
- 纯java实现，无任何依赖
- 充分的测试
- 支持: Java properties, JSON, and a human-friendly JSON superset
- 可以合并各种格式的配置文件
- 可以通过文件、urls、classpath加载配置
- 支持多层嵌套的配置方式
- 识别Java system properties, 如
java -Dmyapp.foo.bar=10 - 可以转换长短，大小等单位。如配置文件中
timeout=10s,则可以转换成任意的毫秒或者 - 类型转换，比如yes可以转换为boolean类型的true
- JSON superset features:
- comments
- includes
- substitutions
("foo" : ${bar},"foo" : Hello ${who}) - properties-like notation (a.b=c)
- less noisy, more lenient syntax
- substitute environment variables (logdir=${HOME}/logs)
目前config只支持配置文件，如果想从数据库获取配置文件，需要自己diy。 config库很擅长合并配置。
Example
默认加载classpath下的application.conf,application.json和application.properties文件。通过ConfigFactory.load()加载。
# these are our own config values defined by the app
simple-app {
answer=42
}
# Here we override some values used by a library
simple-lib.foo="This value comes from simple-app's application.conf"
simple-lib.whatever = "This value comes from simple-app's application.conf"public class SimpleLibContext {
private Config config;
//指定配置文件
public SimpleLibContext(Config config) {
this.config = config;
config.checkValid(ConfigFactory.defaultReference(), "simple-lib");
}
// 默认加载classpath下的application.*
public SimpleLibContext() {
this(ConfigFactory.load());
}
//打印
public void printSetting(String path) {
System.out.println("The setting '" + path + "' is: " + config.getString(path));
}
public static void main(String[] args) {
SimpleLibContext s = new SimpleLibContext();
s.printSetting("simple-app.answer");
}
}Reference
http://stackoverflow.com/questions/18668883/using-typesafes-config-to-manage-my-database-connection
https://github.com/typesafehub/config/tree/master/examples
https://github.com/typesafehub/config
