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
- 创建
META-INF/spring.factories
文件{类似于Spring boot 自定义Starter} - 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
- 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;
}
}
- 配置META-INF/spring.factories
org.springframework.cloud.bootstrapConfiguration= \
com.segmentfault.springcloudlesson1.bootstrap.MyConfiguration,\
com.segmentfault.springcloudlesson1.bootstrap.MyPropertySourceLocator