在Ubuntu64 9.04机器上的Java应用程序中，域名parsing不起作用。 所有其他软件正确parsingDNS

我在Ubuntu644.04 PC上安装了一些Java应用程序，它们都不能parsing域名（也有多个JRE，其中一些是IBM产品）。 如果我将域名放在hosts文件中，并且与相关的IP地址相关联，那么Java应用程序仅适用于这些域。 其他非Java程序 – 比如ping，firefox等 – 在域parsing方面工作得很好。 我已经尝试禁用java.security文件中的DNScaching – 对于我的所有JRE，但是这也不起作用。 我希望得到一些帮助，找出这一个。 谢谢！

更新：我相信在我的家或办公室没有代理服务器。 – 我很感谢你们帮助我。 我现在真的想要使用Linux而不是Windows，现在我正在做Java开发。

jgreenwood@jeg-ubuntu64:~$ cat /etc/resolv.conf # Generated by NetworkManager domain hsd1.in.comcast.net. search hsd1.in.comcast.net. nameserver 192.168.0.1 jgreenwood@jeg-ubuntu64:~$ env | grep -i proxy jgreenwood@jeg-ubuntu64:~$ dig google.com ; <<>> DiG 9.5.1-P2 <<>> google.com ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56845 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;google.com. IN A ;; ANSWER SECTION: google.com. 58 IN A 74.125.53.100 google.com. 58 IN A 74.125.45.100 google.com. 58 IN A 74.125.67.100 ;; Query time: 35 msec ;; SERVER: 192.168.0.1#53(192.168.0.1) ;; WHEN: Thu Oct 22 13:37:26 2009 ;; MSG SIZE rcvd: 76 

更新：我写了这个Java程序在RAD：

 import java.net.InetAddress; import java.net.UnknownHostException; import java.io.PrintWriter; import java.io.StringWriter; public class DomainResolutionTest { public static void main(String[] args) { if (args.length == 0) args = new String[] { "www.google.com" }; try { InetAddress ip = InetAddress.getByName(args[0]); System.out.println(ip.toString()); }catch (UnknownHostException uhx) { System.out.println("ERROR: " + uhx.getMessage() + "\n" + getStackTrace(uhx)); Throwable cause = uhx.getCause(); if (cause != null) System.out.println("CAUSE: " + cause.getMessage()); } } public static String getStackTrace(Throwable t) { StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw, true); t.printStackTrace(pw); pw.flush(); sw.flush(); return sw.toString(); } } 

输出是：

• Windows Azure：如何将301非wwwurl转换为www域名
• 来自getaddrinfo的响应缓慢
• 如何从dns域名获得简短的“域名”？
• Windows DNS挂钩
• 如何在Windows上configuration用户特定的主机文件

 ERROR: www.google.com java.net.UnknownHostException: www.google.com at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:862) at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1213) at java.net.InetAddress.getAllByName0(InetAddress.java:1166) at java.net.InetAddress.getAllByName(InetAddress.java:1096) at java.net.InetAddress.getAllByName(InetAddress.java:1032) at java.net.InetAddress.getByName(InetAddress.java:982) at DomainResolutionTest.main(DomainResolutionTest.java:12) 

从命令行：（相同的结果）

 jgreenwood@jeg-ubuntu64:~$ javac DomainResolutionTest.java jgreenwood@jeg-ubuntu64:~$ java DomainResolutionTest ERROR: www.google.com java.net.UnknownHostException: www.google.com at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:849) at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1200) at java.net.InetAddress.getAllByName0(InetAddress.java:1153) at java.net.InetAddress.getAllByName(InetAddress.java:1083) at java.net.InetAddress.getAllByName(InetAddress.java:1019) at java.net.InetAddress.getByName(InetAddress.java:969) at DomainResolutionTest.main(DomainResolutionTest.java:12) jgreenwood@jeg-ubuntu64:~$ java -version java version "1.6.0_16" Java(TM) SE Runtime Environment (build 1.6.0_16-b01) Java HotSpot(TM) Server VM (build 14.2-b01, mixed mode) jgreenwood@jeg-ubuntu64:~$ 

 java -Djava.net.preferIPv4Stack=true DomainResolutionTest 

 jgreenwood@jeg-ubuntu64:~$ java -Djava.net.preferIPv4Stack=true DomainResolutionTest www.google.com/209.85.225.106 jgreenwood@jeg-ubuntu64:~$ java DomainResolutionTest ERROR: www.google.com java.net.UnknownHostException: www.google.com at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:849) at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1200) at java.net.InetAddress.getAllByName0(InetAddress.java:1153) at java.net.InetAddress.getAllByName(InetAddress.java:1083) at java.net.InetAddress.getAllByName(InetAddress.java:1019) at java.net.InetAddress.getByName(InetAddress.java:969) at DomainResolutionTest.main(DomainResolutionTest.java:12) 

 jgreenwood@jeg-ubuntu64:~$ dpkg -L lib32nss-mdns Package `lib32nss-mdns' is not installed. Use dpkg --info (= dpkg-deb --info) to examine archive files, and dpkg --contents (= dpkg-deb --contents) to list their contents.