查询 DNS 服务记录以查找主机名和 TCP/IP [英] Querying the DNS service records to find the hostname and TCP/IP

问题描述

在一篇关于生命科学标识符的论文中(参见LSID 测试器，一种用于测试生命科学标识符解析服务的工具)，Roderic DM Page 博士写道:

In a paper about the Life Science Identifiers (see LSID Tester, a tool for testing Life Science Identifier resolution services), Dr Roderic DM Page wrote :

给定 LSID urn:lsid**:ubio.org**:namebank:11815，查询 _lsid._tcp 的 SRV 记录的 DNS.ubio.org 返回animalia.ubio.org:80 作为ubio.org LSID 服务的位置.

Given the LSID urn:lsid**:ubio.org**:namebank:11815, querying the DNS for the SRV record for _lsid._tcp.ubio.org returns animalia.ubio.org:80 as the location of the ubio.org LSID service.

我了解到我可以在 unix 上使用 host 命令将 _lsid._tcp.ubio.org 链接到animalia.ubio.org:80:

I learned that I can link _lsid._tcp.ubio.org to animalia.ubio.org:80 using the host command on unix:

host -t srv _lsid._tcp.ubio.org
_lsid._tcp.ubio.org has SRV record 1 0 80 ANIMALIA.ubio.org

我如何使用 Java J2SE API 来做这个DNS"事情(没有任何外部 Java 库，我想要一个轻量级的解决方案)?

How can I do this 'DNS' thing using the Java J2SE API (Without any external java library, I'd like a lightweight solution ) ?

谢谢

推荐答案

JNDI DNS 提供程序可以查找 SRV 记录.您需要执行以下操作:

The JNDI DNS provider can lookup SRV records. You need to do something like:

Hashtable env = new Hashtable();
env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
env.put("java.naming.provider.url", "dns:");
DirContext ctx = new InitialDirContext(env);
Attributes attrs = ctx.getAttributes("_lsid._tcp.ubio.org", new String[] { "SRV" });

返回的属性是字符串的枚举，看起来像1 0 80 ANIMALIA.ubio.org".空格分隔的字段按顺序排列:

The returned attributes are an enumeration of strings that look like "1 0 80 ANIMALIA.ubio.org". The space separated fields are in order:

1. 优先事项
2. 重量
3. 端口
4. 服务器

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