如何更改java DNS服务提供商 [英] How to change the java DNS service provider

问题描述

我正在构建一个快速的网络爬虫，我需要多线程的DNS解析，所以我选了一个叫做 dnsjava的多线程DNS服务提供商。不幸的是，我不知道如何更换默认的DNS服务提供商。

我浏览了 README 文件为dnsjava，但说明并不是很好。

更换标准的Java DNS
功能：

从Java 1.4开始，服务
提供程序可以在运行时加载。
要加载dnsjava服务提供程序，
如上所述构建它，并设置
系统属性：

sun.net.spi .nameservice.provider.1 = dns，dnsjava

这指示JVM以
最高优先级为DNS使用
dnsjava服务。

有几件事我不清楚：

1. 我在哪里放置dnsjava.jar？


2. 系统属性应该在哪里设置（是程序设计还是某种类型的文件更改）？

我在Windows 7机器上运行，我不知道我需要做什么来查找/修改系统属性...帮助！

更新：

得到： System.setProperty sun.net.spi.nameservice.provider.1，dns，dnsjava）;

解决方案

一个狂野的猜测。

1. 将dnsjava.jar文件放在应用程序的类路径中。


2. 在您的应用程序启动主方法之前设置系统属性。

I'm building a fast web crawler and I need to have multithreaded DNS resolution, so I picked up a multithreaded DNS service provider called dnsjava. Unfortunately, I can't figure out how to replace the default DNS Service Provider.

I went over the README file for dnsjava, but the instructions are not very through.

Replacing the standard Java DNS functionality:

Beginning with Java 1.4, service providers can be loaded at runtime. To load the dnsjava service provider, build it as explained above and set the system property:

sun.net.spi.nameservice.provider.1=dns,dnsjava

This instructs the JVM to use the dnsjava service provide for DNS at the highest priority.

There are a couple of things that I'm unclear on:

1. Where do I place the dnsjava.jar?
2. Where is the system property supposed to be set (is it programmatic or some type of file change)?

I'm running on a Windows 7 machine and I'm not sure what I need to do to find/modify the system properties... help!?

Update:
Got it: System.setProperty("sun.net.spi.nameservice.provider.1","dns,dnsjava");

解决方案

A wild guess.

1. Put the dnsjava.jar file in the classpath of your application.
2. Have the system property set before launching the main method in your application.

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