Spring cloud配置客户端（三）

覆盖远程配置属性

默认情况，Spring Cloud是允许覆盖的，spring.cloud.config.allowOverride=true
通过程序启动参数，调整这个值为"false"

--spring.cloud.config.allowOverride=true

启动后，重新Postman发送POST请求，调整spring.application.name值为"spring-cloud-new"

重点：如果spring.application.name不写的话，默认的话是项目名

自定义Bootstrap配置

1. 创建META-INF/spring.factories文件{类似于Spring boot 自定义Starter｝
2. 自定义Bootstrap配置Configurtion

package com.segmentfault.springcloudlesson1.bootstrap; import org.springframework.context.ApplicationContextInitializer; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.annotation.Configuration; import org.springframework.core.env.ConfigurableEnvironment; import org.springframework.core.env.MapPropertySource; import org.springframework.core.env.MutablePropertySources; import org.springframework.core.env.PropertySource; import java.util.HashMap; import java.util.Map; /** * bootstrap 配置bean */ @Configuration public class MyConfiguration implements ApplicationContextInitializer { @Override public void initialize(ConfigurableApplicationContext applicationContext) { //从ConfigurableApplicationContext获取ConfigurableEnvironment实例 ConfigurableEnvironment environment = applicationContext.getEnvironment(); //获取PropertySources MutablePropertySources propertySources = environment.getPropertySources(); //定义一个新的 propertySource，并放置在首位 propertySources.addFirst(createPropertySource()); } private PropertySource createPropertySource() { Map<String, Object> source = new HashMap<>(); source.put("name", "shuai"); PropertySource propertySource = new MapPropertySource("my-property-source", source); return propertySource; } }

三. 配置MEAT-INF/spring.factories文件，关联Key

org.springframework.cloud.bootstrapConfiguration= \ com.segmentfault.springcloudlesson2.bootstrap.Myconfiguration

自定义Bootstrap配置属性源

1. 实现PropertySourceLocator

package com.segmentfault.springcloudlesson1.bootstrap; import org.springframework.cloud.bootstrap.config.PropertySourceLocator; import org.springframework.core.env.*; import java.util.HashMap; import java.util.Map; /** * 自定义{@link PropertySourceLocator}实现 */ public class MyPropertySourceLocator implements PropertySourceLocator { @Override public PropertySource<?> locate(Environment environment) { if (environment instanceof ConfigurableEnvironment) { ConfigurableEnvironment configurableEnvironment = ConfigurableEnvironment.class.cast(environment); //获取PropertySources MutablePropertySources propertySources = configurableEnvironment.getPropertySources(); //定义一个新的 propertySource，并放置在首位 propertySources.addFirst(createPropertySource()); } return null; } private PropertySource createPropertySource() { Map<String, Object> source = new HashMap<>(); source.put("spring.application.name", "shuaishuai"); //设置名称和来源 PropertySource propertySource = new MapPropertySource("over-bootstrap", source); return propertySource; } }

1. 配置META-INF/spring.factories

org.springframework.cloud.bootstrapConfiguration= \ com.segmentfault.springcloudlesson1.bootstrap.MyConfiguration,\ com.segmentfault.springcloudlesson1.bootstrap.MyPropertySourceLocator