Spring Cloud中配置客户端示例详解

String configName = environment.resolvePlaceholders("${spring.cloud.bootstrap.name:bootstrap}");

## application.properties
## 通过调整 spring.cloud.bootstrap.enabled = false，尝试关闭 bootstrap 上下文
## 实际测试结果，没有效果
spring.cloud.bootstrap.enabled = false

--spring.cloud.bootstrap.enabld = true

--spring.cloud.bootstrap.name=spring-cloud

--spring.cloud.bootstrap.name=spring-cloud

--spring.cloud.bootstrap.location=config

--spring.cloud.config.allowOverride=false

 
​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
 *
 * 
 * @since Configuration
 */
@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，并且放置在首位
        propertySources.addFirst(createPropertySource());
​
    }
​
    private PropertySource createPropertySource() {
​
        Map<String, Object> source = new HashMap<>();
​
        source.put("name", "小马哥");
​
        PropertySource propertySource = new MapPropertySource("my-property-source", source);
​
        return propertySource;
​
    }
}

org.springframework.cloud.bootstrap.BootstrapConfiguration= \
com.segmentfault.springcloudlesson2.boostrap.MyConfiguration

 
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
 *
 * @since PropertySourceLocator
 */
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，并且放置在首位
            propertySources.addFirst(createPropertySource());
​
        }
        return null;
    }
​
    private PropertySource createPropertySource() {
​
        Map<String, Object> source = new HashMap<>();
​
        source.put("spring.application.name", "小马哥的 Spring Cloud 程序");
        // 设置名称和来源
        PropertySource propertySource = new MapPropertySource("over-bootstrap-property-source", source);
​
        return propertySource;
​
    }
}

org.springframework.cloud.bootstrap.BootstrapConfiguration= \
com.segmentfault.springcloudlesson2.boostrap.MyConfiguration,\
com.segmentfault.springcloudlesson2.boostrap.MyPropertySourceLocator