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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ### 55.1.1 綁定服務 默認情況下,運行應用的元數據和服務連接信息被暴露為應用的環境變量(比如`$VCAP_SERVICES`),采用這種架構的原因是因為Cloud Foundry多語言特性(任何語言和平臺都支持作為buildpack),進程級別的環境變量是語言無關(language agnostic)的。 環境變量并不總是有利于設計最簡單的API,所以Spring Boot自動提取它們,然后將這些數據導入能夠通過Spring `Environment`抽象訪問的屬性里: ```java @Component class MyBean implements EnvironmentAware { private String instanceId; @Override public void setEnvironment(Environment environment) { this.instanceId = environment.getProperty("vcap.application.instance_id"); } // ... } ``` 所有的Cloud Foundry屬性都以`vcap`作為前綴,你可以使用vcap屬性獲取應用信息(比如應用的公共URL)和服務信息(比如數據庫證書),具體參考`CloudFoundryVcapEnvironmentPostProcessor` Javadoc。 **注**:[Spring Cloud Connectors](http://cloud.spring.io/spring-cloud-connectors/)項目很適合比如配置數據源的任務,Spring Boot為它提供了自動配置支持和一個`spring-boot-starter-cloud-connectors` starter。
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