SpringBoot 配置文件外置方案

方案一：项目启动时设置环境变量

在Application文件中的configure方法添加如下代码（注：会影响同一jvm环境中的其他项目）：

YamlPropertiesFactoryBean yaml = new YamlPropertiesFactoryBean();
yaml.setResources(new FileSystemResource(“yml文件地址”));
System.getProperties().putAll(Objects.requireNonNull(yaml.getObject()));

方案二：基于SpringCloud的PropertySourceLocator接口加载配置文件

在pom文件中添加依赖：

<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter</artifactId>
	<version>2.2.1.RELEASE</version>
</dependency>

实现PropertySourceLocator接口，完整代码如下：

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.config.YamlMapFactoryBean;
import org.springframework.cloud.bootstrap.config.PropertySourceLocator;
import org.springframework.core.annotation.Order;
import org.springframework.core.env.Environment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.FileSystemResource;
import java.util.*;

@Slf4j
@Order(0)
public class IvPropertySourceLocator implements PropertySourceLocator {

    @Override
    public PropertySource<?> locate(Environment environment) {
        return new MapPropertySource("iv", ymlParse("/opt/weblogic/config/application-dev.yml"));
    }

    /**
     * yml文件解析
     */
    private Map<String, Object> ymlParse(String location) {
        log.info("开始加载系统配置文件 >>>>> {}", location);
        YamlMapFactoryBean yamlFactory = new YamlMapFactoryBean();
        yamlFactory.setResources(new FileSystemResource(location));
        Map<String, Object> result = new LinkedHashMap<>();
        flattenedMap(result, Objects.requireNonNull(yamlFactory.getObject()), null);
        return result;
    }

    protected void flattenedMap(Map<String, Object> result, Map<String, Object> dataMap,
                                String parentKey) {
        for (Map.Entry<String, Object> entry : dataMap.entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();

            String fullKey = StringUtils.isEmpty(parentKey) ? key : key.startsWith("[")
                    ? parentKey.concat(key) : parentKey.concat(".").concat(key);
            if (value instanceof Map) {
                Map<String, Object> map = (Map<String, Object>) value;
                flattenedMap(result, map, fullKey);
                continue;
            } else if (value instanceof Collection) {
                int count = 0;
                Collection<Object> collection = (Collection<Object>) value;
                for (Object object : collection) {
                    flattenedMap(result,
                            Collections.singletonMap("[" + (count++) + "]", object),
                            fullKey);
                }
                continue;
            }
            result.put(fullKey, value);
        }
    }
}