spring boot 2.0特性之外部化配置

import org.springframework.stereotype.*
import org.springframework.beans.factory.annotation.*

@Component
public class MyBean {

    @Value("${name}")
    private String name;

    // ...

}

java -jar app.jar --name="Spring"

 SPRING_APPLICATION_JSON='{"acme":{"name":"test"}}' java -jar myapp.jar

 java -Dspring.application.json='{"name":"test"}' -jar myapp.jar

java -jar myapp.jar --spring.application.json='{"name":"test"}'

配置随机变量

my.secret=${random.value}
my.number=${random.int}
my.bignumber=${random.long}
my.uuid=${random.uuid}
my.number.less.than.ten=${random.int(10)}
my.number.in.range=${random.int[1024,65536]}

SpringApplication.setAddCommandLineProperties(false).

#通过第一种方式 
java -jar myproject.jar --spring.config.name=myproject
##方式二
 java -jar myproject.jar --spring.config.location=classpath:/default.properties,classpath:/override.properties

1. file:./config/
2. file:./
3. classpath:/config/
4. classpath:/

1. file:./custom-config/
2. classpath:custom-config/
3. file:./config/
4. file:./
5. classpath:/config/
6. classpath:/

特定环境配置属性（profile-specific）

属性中的占位符

app.name=MyApp
app.description=${app.name} is a Spring Boot application

使用YAML代替属性

environments:
	dev:
		url: http://dev.example.com
		name: Developer Setup
	prod:
		url: http://another.example.com
		name: My Cool App

environments.dev.url=http://dev.example.com
environments.dev.name=Developer Setup
environments.prod.url=http://another.example.com
environments.prod.name=My Cool App

my:
servers:
	- dev.example.com
	- another.example.com

my.servers[0]=dev.example.com
my.servers[1]=another.example.com

@ConfigurationProperties(prefix="my")
public class Config {

	private List<String> servers = new ArrayList<String>();

	public List<String> getServers() {
		return this.servers;
	}
}

server:
	address: 192.168.1.100
---
spring:
	profiles: development
server:
	address: 127.0.0.1
---
spring:
	profiles: production
server:
	address: 192.168.1.120

@ConfigurationProperties("acme")
public class AcmeProperties {

	private final List<MyPojo> list = new ArrayList<>();

	public List<MyPojo> getList() {
		return this.list;
	}

}
-----------------------------------------------
acme:
  list:
    - name: my name
      description: my description
---
spring:
  profiles: dev
acme:
  list:
       - name: my another name

acme:
  list:
	- name: my name
	  description: my description
	- name: another name
	  description: another description
---
spring:
  profiles: dev
acme:
  list:
	 - name: my another name

acme:
  list:
	- name: my name
	  description: my description
	- name: another name
	  description: another description
---
spring:
  profiles: dev
acme:
  list:
	 - name: my another name

@Configuration
@EnableConfigurationProperties(AcmeProperties.class)
public class MyConfiguration {
}

@Component
@ConfigurationProperties(prefix="acme")
public class AcmeProperties {

	// ... see the preceding example

}

# application.yml

acme:
	remote-address: 192.168.1.1
	security:
		username: admin
		roles:
		  - USER
		  - ADMIN

# additional configuration as required

@Service
public class MyService {

	private final AcmeProperties properties;

	@Autowired
	public MyService(AcmeProperties properties) {
	    this.properties = properties;
	}

 	//...

	@PostConstruct
	public void openConnection() {
		Server server = new Server(this.properties.getRemoteAddress());
		// ...
	}

}

@ConfigurationProperties(prefix = "another")
@Bean
public AnotherComponent anotherComponent() {
	...
}

@ConfigurationProperties(prefix="acme.my-project.person")
public class OwnerProperties {

	private String firstName;

	public String getFirstName() {
		return this.firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

}

@ConfigurationProperties(prefix="acme")
@Validated
public class AcmeProperties {

	@NotNull
	private InetAddress remoteAddress;

	// ... getters and setters

}

@ConfigurationProperties(prefix="acme")
@Validated
public class AcmeProperties {

	@NotNull
	private InetAddress remoteAddress;

	@Valid
	private final Security security = new Security();

	// ... getters and setters

	public static class Security {

		@NotEmpty
		public String username;

		// ... getters and setters

	}

}