[Java] 从dubbo zookeeper注册地址提取出zookeeper地址的方法

zookeeper://localhost:2181
zookeeper://localhost:2181?client=zkclient
zookeeper://localhost:2181?backup=localhost:2182,localhost:2183
zookeeper://localhost:2181?client=zkclient&backup=localhost:2182,localhost:2183
------------结果------------
optional[localhost:2181]
optional[localhost:2181]
optional[localhost:2181,localhost:2182,localhost:2182]
optional[localhost:2181,localhost:2183,localhost:2183]

import java.util.optional;
public class zookeeperurl {
  public static final string prefix = "zookeeper://";
  public static final string backup = "backup=";
  public static optional<string> convertdubboregistrytozookeeperurl(string dubboregistry){
  stringbuilder zookeeperurl = new stringbuilder();
  if(dubboregistry != null && dubboregistry.startswith(prefix)){
    dubboregistry = dubboregistry.substring(prefix.length());
    int index = dubboregistry.indexof("?");
    if(index > 0){
    zookeeperurl.append(dubboregistry.substring(0, index));
    dubboregistry = dubboregistry.substring(index + 1);
    string[] dubboregistries = dubboregistry.split("&");
    for (int i = 0; i < dubboregistries.length; i++) {
      if(dubboregistries[i].startswith(backup)){
      string[] backups = dubboregistries[i].substring(backup.length()).split(",");
      for (int j = 0; j < backups.length; j++) {
        zookeeperurl.append(",").append(backups[i]);
      }
      }
    }
    } else {
    zookeeperurl.append(dubboregistry);
    }
    return optional.of(zookeeperurl.tostring());
  }
  return optional.empty();
  }
  public static void main(string[] args) {
  system.out.println(convertdubboregistrytozookeeperurl("zookeeper://localhost:2181"));
  system.out.println(convertdubboregistrytozookeeperurl("zookeeper://localhost:2181?client=zkclient"));
  system.out.println(convertdubboregistrytozookeeperurl("zookeeper://localhost:2181?backup=localhost:2182,localhost:2183"));
  system.out.println(convertdubboregistrytozookeeperurl("zookeeper://localhost:2181?client=zkclient&backup=localhost:2182,localhost:2183"));
  }
}