spring+apollo动态获取yaml格式的配置方式

默认spring装载的都是.properties格式的配置文件，但是有时我们需要定义list或者map类型的配置，那么yaml就具有优势。

以下演示利用apollo来完成自动更新ip白名单的功能

1.重写配置工厂

public class YmlPropertySourceFactory extends DefaultPropertySourceFactory {
 public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
 String configName = resource.getResource().getFilename();
 ConfigFile configFile = ConfigService.getConfigFile(configName.substring(0, configName.indexOf(".")), ConfigFileFormat.YML);
 String ct = configFile.getContent();
 return YamlPropUtil.buildYaml(configName, ct);
 }
}

定义-D参数的appid和conf目录

public class YamlPropUtil {
 public static PropertySource buildYaml(String name, String content) throws IOException {
 String sysName = System.getProperty("app.id");
 String appDir = System.getProperty("apollo.cacheDir");
 if (appDir.endsWith(File.separator)) {
 appDir= appDir.substring(0, appDir.length() - 1);
 }
 String filePath = appDir+ File.separator + sysName + File.separator + name;
 File file = new File(filePath);
 if (file.exists()) {
 file.delete();
 }
 try (BufferedWriter bufferedWriter = Files.newWriter(file, Charsets.UTF_8)) {
 bufferedWriter.write(content);
 bufferedWriter.flush();
 List<PropertySource<?>> sources = new YamlPropertySourceLoader().load(name, new FileSystemResource(filePath));
 return sources.get(0);
 } catch (IOException e) {
 throw e;
 }
 }
}

2.装载配置

whiteList.yml

注意本地也要存放上述文件在classpath下

white:
 ip:
 #ip白名单列表
 list:
 - 192.168.103.34
 - 192.168.1.102
@Configuration
@ConfigurationProperties(prefix = "white.ip")
@PropertySource(value = "classpath:whiteList.yml", factory = YmlPropertySourceFactory.class)
@Slf4j
public class IpWhiteListService {
 private List<String> list;
 private final static int MAX_PROP_ITEM = 1000;
 private final static String PROP_NAME = "whiteList.yml";
 private final static String KEY_PREFIX = "white.ip.list";

 public void setList(List<String> list) {
 this.list = list;
 }

 public boolean isAllow(String address) {
 return list.contains(address);
 }

 @ApolloConfigChangeListener(PROP_NAME)
 public void onChange(ConfigChangeEvent changeEvent) {
 Set<String> keys = changeEvent.changedKeys();

 keys.forEach(e -> {
 String newVal = changeEvent.getChange(e).getNewValue();
 log.debug("whiteList is changed={}", newVal);
 String ct = newVal;
 org.springframework.core.env.PropertySource propertySource = null;
 try {
 propertySource = YamlPropUtil.buildYaml(PROP_NAME, ct);
 } catch (IOException ex) {
 log.error("", e);
 }
 List<String> newList = Lists.newArrayList();
 for (int i = 0; i < MAX_PROP_ITEM; i++) {
 String pName = KEY_PREFIX + "[" + i + "]";
 if (propertySource.containsProperty(pName)) {
  String val = (String) propertySource.getProperty(pName);
  newList.add(val);
 }
 }
 list = newList;
 });
 }
}

补充知识：yml格式问题

以缩进代表层级关系

空格个数不重要，但是同一层级必须左对齐

大小写敏感

格式为：key= value

注释单行用#，只能注释单行

application.properties中

logging.level.root=DEBUG
logging.level.org.springframework=DEBUG
logging.level.org.org.mybatis=DEBUG

转化为application.yml中

logging:
level:
root: DEBUG
org.springframework: DEBUG
org.org.mybatis: DEBUG

冒号后面必须跟空格，否则格式错误

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