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

以上这篇spring+apollo动态获取yaml格式的配置方式就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。