Update 23.6.1. Loading YAML.md
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### 23.6.1. 加载YAML
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Spring框架提供两个便利的类用于加载YAML文档,YamlPropertiesFactoryBean会将YAML作为Properties来加载,YamlMapFactoryBean会将YAML作为Map来加载。
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示例:
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```json
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environments:
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dev:
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url: http://dev.bar.com
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name: Developer Setup
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prod:
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url: http://foo.bar.com
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name: My Cool App
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```
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上面的YAML文档会被转化到下面的属性中:
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```java
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environments.dev.url=http://dev.bar.com
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environments.dev.name=Developer Setup
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environments.prod.url=http://foo.bar.com
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environments.prod.name=My Cool App
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```
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YAML列表被表示成使用[index]间接引用作为属性keys的形式,例如下面的YAML:
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```json
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my:
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servers:
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- dev.bar.com
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- foo.bar.com
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```
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将会转化到下面的属性中:
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```java
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my.servers[0]=dev.bar.com
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my.servers[1]=foo.bar.com
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```
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使用Spring DataBinder工具绑定那样的属性(这是@ConfigurationProperties做的事),你需要确定目标bean中有个java.util.List或Set类型的属性,并且需要提供一个setter或使用可变的值初始化它,比如,下面的代码将绑定上面的属性:
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```java
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@ConfigurationProperties(prefix="my")
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public class Config {
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private List<String> servers = new ArrayList<String>();
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public List<String> getServers() {
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return this.servers;
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}
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}
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```
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