详解Spring Boot加载properties和yml配置文件

一、系统启动后注入配置

package com.example.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;

/**
* @author: GrandKai
* @create: 2016-09-01 11:24
*/
@Configuration
@PropertySource(ignoreResourceNotFound = true, value = {"classpath:/config/email.properties","classpath:/config/email.yml"}, name = "email")
public class Config {}

需要在ApplicationContext中注册配置

AnnotationConfigEmbeddedWebApplicationContext context = (AnnotationConfigEmbeddedWebApplicationContext) app.run("参数1");
context.register(Config.class);

用以下方式取值

Environment env = context.getEnvironment();
System.out.println(env.getProperty("address"));

email.yml文件配置如下：

server:
address: 127.0.0.1

二、在命令行传入注入到程序中

public class Main {
 public static void main(String... args) {
   //initialize the command line parsing stuff
   OptionParser parser = new OptionParser();
   parser.accepts("greeting").withRequiredArg();
   OptionSet options = parser.parse(args);

//create the actual Spring PropertySource
   PropertySource<?> ps = new JOptCommandLinePropertySource(options);

//setup the Spring context
   AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
   ctx.getEnvironment().getPropertySources().addLast(ps);
   //register the property source with the environment

ctx.register(Greeter.class);
   ctx.refresh();
   Greeter greeter = ctx.getBean(Greeter.class);
   greeter.sayGreeting();
 }
}

@Component
class Greeter {
 @Inject private Environment env;

//the following would also work
 //@Value("${greeting}")
 //private String greeting;    

/**
  * Print out the 'greeting' property if it exists, and otherwise, "Welcome!".
  */
 public void sayGreeting() {
   System.out.println(env.getProperty("greeting", "Welcome!"));
 }
}

public static void main(String [] args) {
 SimpleCommandLinePropertySource ps = new SimpleCommandLinePropertySource(args);
 @SuppressWarnings("resource")
 AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
 ctx.getEnvironment().getPropertySources().addFirst(ps);
 ctx.register(ApplicationConfig.class);
 ctx.refresh();
}

@Configuration
@EnableScheduling
@ComponentScan("com.mycompany.package")
@PropertySource(
   value = {"classpath:/application.properties", "file:${config.location}"},
   ignoreResourceNotFound = true
 )
class ApplicationConfig {

@Bean
 public static PropertySourcesPlaceholderConfigurer propertyConfigurer() {
   return new PropertySourcesPlaceholderConfigurer();
 }
}

@Component
class MyComponent {

@Value("${my.property.data}")
 private String myPropertyData;

@Scheduled(fixedDelayString = "${schedule.delay.period}")
 public void run() {
    :
 }
}

来源：http://www.jianshu.com/p/eadfecea1f2d