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

在有关生命科学标识符的论文中（见 LSID测试仪，用于测试生命科学标识符解析服务的工具），Dr.Roderic DM页面写道：

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DNS的SRV记录为 _lsid._tcp 。 ubio.org 返回animalia.ubio.org:80作为ubio.org LSID服务。

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，我可以使用主机链接_lsid._tcp.ubio.org到animalia.ubio.org:80， strong>命令在unix上：

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

我该怎么做这个DNS使用Java J2SE API的东西（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提供商可以查找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" });

返回的属性是一个字符串的枚举，如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


2. 重量


3. port


4. 服务器

1. priority
2. weight
3. port
4. server

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