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| Highway |
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| <h1 id="_1">在程序中读取配置信息</h1> |
| <p>Java Chassis支持使用一致的API获取配置,开发者不需要关注从哪里读取配置项的 |
| 值,Java Chassis会自动从各处读取配置,并按照优先级进行合并以保证用户取到的是优先级最高的配置值。读取配置信息支持下面几种不同的方式。 </p> |
| <h2 id="spring-boot">使用 Spring Boot 的配置机制读取配置</h2> |
| <p>Java Chassis的配置信息,可以通过Spring和Spring Boot的配置机制进行读取,比如 <code>@Value</code>、<code>@ConfigurationProperties</code>、 <code>Environment</code> 等。 Java Chassis |
| 将配置层次应用于Spring Environment中,Spring和Spring Boot读取配置的方式,也能够读取到<code>microservice.yaml</code>和动态配置的值。</p> |
| <blockquote> |
| <blockquote> |
| <blockquote> |
| <p>注意: <code>@Value</code>、<code>@ConfigurationProperties</code> 两种使用方式,在动态配置变化的时候,值不会变化。 使用 <code>Environment</code>, 在动态配置变化的时候,值会实时变化。 </p> |
| </blockquote> |
| </blockquote> |
| </blockquote> |
| <h2 id="dymamicproperties">使用 <code>DymamicProperties</code> 监听配置变化</h2> |
| <p>注入 <code>DymamicProperties</code>, 通过其 API 读取配置和监听配置变化。 </p> |
| <pre><code class="language-java">@RestSchema(schemaId = "ProviderController") |
| @RequestMapping(path = "/") |
| public class ProviderController { |
| private DynamicProperties dynamicProperties; |
| |
| private String example; |
| |
| @Autowired |
| public ProviderController(DynamicProperties dynamicProperties) { |
| this.dynamicProperties = dynamicProperties; |
| this.example = this.dynamicProperties.getStringProperty("basic.example", |
| value -> this.example = value, "not set"); |
| } |
| } |
| </code></pre> |
| <h2 id="java-chassis">使用 Java Chassis 优先级配置</h2> |
| <p>优先级配置提供了一种简单的管理大量复杂配置的机制,开发者定义一个简单的 JAVA Bean, 定义这个 Bean 的属性对应的配置项, 当配置信息变化的时候, Bean 的属性会自动刷新,极大 |
| 的简化了用户管理大量复杂配置的复杂度。 </p> |
| <p>Bean 属性对应的配置项名称支持通配符, 一个属性可以关联若干配置项,可以声明这些配置项的优先级。 Java对象可以是一个 Java Bean,或是一个拥有public字段的类。</p> |
| <ul> |
| <li>配置注入对象</li> |
| </ul> |
| <p>我们首先设计两个Java类用于注入配置属性,分别用来演示不使用注解和使用注解的场景。使用@InjectProperties注解并声明为Bean:</p> |
| <pre><code> ```Java |
| @Component |
| @InjectProperties(prefix = "jaxrstest.jaxrsclient") |
| public class Configuration { |
| /* |
| * 方法的 prefix 属性值 "override" 会覆盖标注在类定义的 @InjectProperties |
| * 注解的 prefix 属性值。 |
| * |
| * keys属性可以为一个字符串数组,下标越小优先级越高。 |
| * |
| * 这里会按照如下顺序的属性名称查找配置属性,直到找到已被配置的配置属性,则停止查找: |
| * 1) jaxrstest.jaxrsclient.override.high |
| * 2) jaxrstest.jaxrsclient.override.low |
| * |
| * 测试用例: |
| * jaxrstest.jaxrsclient.override.high: hello high |
| * jaxrstest.jaxrsclient.override.low: hello low |
| * 预期: |
| * hello high |
| */ |
| @InjectProperty(prefix = "jaxrstest.jaxrsclient.override", keys = {"high", "low"}) |
| public String strValue; |
| |
| /** |
| * keys支持通配符,并在可以在将配置属性注入的时候指定通配符的代入对象。 |
| * |
| * 测试用例: |
| * jaxrstest.jaxrsclient.k.value: 3 |
| * 预期: |
| * 3 |
| */ |
| @InjectProperty(keys = "${key}.value") |
| public int intValue; |
| |
| /** |
| * 通配符的代入对象可以是一个字符串List,优先级遵循数组元素下标越小优先级越高策略。 |
| * |
| * 测试用例: |
| * jaxrstest.jaxrsclient.l1-1: 3.0 |
| * jaxrstest.jaxrsclient.l1-2: 2.0 |
| * |
| * 预期: |
| * 3.0 |
| */ |
| @InjectProperty(keys = "${full-list}") |
| public float floatValue; |
| |
| /** |
| * keys属性也支持多个通配符,优先级如下:首先通配符的优先级从左到右递减, |
| * 然后如果通配符被代入List,遵循List中元素index越小优先级越高策略。 |
| * |
| * 测试用例: |
| * jaxrstest.jaxrsclient.low-1.a.high-1.b: 1 |
| * jaxrstest.jaxrsclient.low-1.a.high-2.b: 2 |
| * jaxrstest.jaxrsclient.low-2.a.high-1.b: 3 |
| * jaxrstest.jaxrsclient.low-2.a.high-2.b: 4 |
| * 预期: |
| * 1 |
| */ |
| @InjectProperty(keys = "${low-list}.a.${high-list}.b") |
| public long longValue; |
| |
| /** |
| * 可以通过注解的defaultValue属性指定默认值。如果字段未关联任何配置属性, |
| * 定义的默认值会生效,否则默认值会被覆盖。 |
| * |
| * 测试用例: |
| * 预期: |
| * abc |
| */ |
| @InjectProperty(defaultValue = "abc") |
| public String strDef; |
| } |
| ``` |
| </code></pre> |
| <p>Configuration对象的longValue字段按以下顺序查找已配置的属性:</p> |
| <pre><code> 1. root.low-1.a.high-1.b |
| 2. root.low-1.a.high-2.b |
| 3. root.low-2.a.high-1.b |
| 4. root.low-2.a.high-2.b |
| </code></pre> |
| <p>Configuration对象的floatValue字段按以下顺序查找已配置的属性:</p> |
| <pre><code> 1. root.l1-1 |
| 2. root.l1-2 |
| </code></pre> |
| <p>不使用注解:</p> |
| <pre><code> ```Java |
| @Component |
| @InjectProperties(prefix = "jaxrstest.jaxrsclient") |
| public class ConfigNoAnnotation { |
| /* |
| * 如果未提供@InjectProperties和@InjectProperty注解,会默认使用字段名作为配置属性名。 |
| * 注意类名不作为前缀起作用。 |
| * 此处将配置属性 strValue 绑定到该字段 |
| */ |
| public String strValue; |
| } |
| ``` |
| </code></pre> |
| <p>ConfigNoAnnotation 对象的 strValue 字段会查找已配置的属性 strValue,没有前缀和优先级。</p> |
| <p>更多关于配置注入的用法,建议下载 java-chassis 的源码, 查看 TestConfigObjectFactory 类里面的示例。</p> |
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