springboot2.0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 servers = new ArrayList(); public List 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 list = new ArrayList<>(); public List 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 } }