用途
项目中使用了 dubbo，注册中心使用的 zookeeper，使用 zookeeper 实现了一个简单的分布式锁（依赖 curator），因为配置文件存在 dubbo.registry 配置，为了直接使用这个地址来创建分布式锁，写了一个简单的方法来提取 zookeeper 地址。
效果
dubbo.registry 有多种配置方式，支持所有情况，下面是常见的例子和提取结果：
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]
代码
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"));
}
}
总结
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