Fwd: 全球互联网的13台DNS根服务器分布

美国VeriSign公司 2台

网络管理组织IANA(Internet Assigned Number Authority) 1台

欧洲网络管理组织RIPE-NCC(Resource IP Europeens Network Coordination Centre) 1台

美国PSINet公司 1台

美国ISI(Information Sciences Institute) 1台

美国ISC(Internet Software Consortium) 1台

美国马里兰大学(University of Maryland) 1台

美国太空总署(NASA) 1台

美国国防部 1台

美国陆军研究所 1台

挪威NORDUnet 1台

日本WIDE(Widely Integrated Distributed Environments)研究计划 1台


关于Apache Portable Runtime and Tomcat

在从Tomcat 5.0.28转向5.5.X或者Tomcat6.X时,在启动时发现出现如下信息
[org.apache.catalina.core.AprLifecycleListener]-[INFO] The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: (...你的系统环境PATH路径...)

[org.apache.catalina.core.AprLifecycleListener]-[INFO] Failed shutdown of Apache Portable Runtime

于是,想消除这个问题,通过查阅 http://tomcat.apache.org/tomcat-5.5-doc/apr.html

Tomcat can use the Apache Portable Runtime to provide superior scalability, performance, and better integration with native server technologies. The Apache Portable Runtime is a highly portable library that is at the heart of Apache HTTP Server 2.x. APR has many uses, including access to advanced IO functionality (such as sendfile, epoll and OpenSSL), OS level functionality (random number generation, system status, etc), and native process handling (shared memory, NT pipes and Unix sockets).

These features allows making Tomcat a general purpose webserver, will enable much better integration with other native web technologies, and overall make Java much more viable as a full fledged webserver platform rather than simply a backend focused technology.

发现 Tomcat 可以用 Apache Portable Runtime 来提供更强性能,提升Web静态页面的处理能力,不再需要专门的Web Server来处理静态页面了。

APR support requires three main native components to be installed:
1、APR library
2、JNI wrappers for APR used by Tomcat (libtcnative)
3、OpenSSL libraries

1、先去 http://tomcat.heanet.ie/native/ 下载编译好的 tcnative-1.dll 文件,也可以下载tomcat-native.zip自己进行编译
2、修改一下 catalina.bat,加上
  set CATALINA_OPTS="-Djava.library.path=../../APR/lib"
因为我把这个DLL放在与Tomcat目录同级的APR/lib目录下,所以采用了相对路径。或者把dll加到你的系统变量PATH里之类的,最简单的方法应当就是把tcnative-1.dll文件放在Tomcat的bin目录下: )

[org.apache.coyote.http11.Http11AprProtocol]-[INFO] Initializing Coyote HTTP/1.1 on http-9091
[org.apache.coyote.http11.Http11AprProtocol]-[INFO] Pausing Coyote HTTP/1.1 on http-9091
[org.apache.coyote.http11.Http11AprProtocol]-[INFO] Stopping Coyote HTTP/1.1 on http-9091



Simple redirect dropdown list

浪花 | SpoonDrift

If you want a simple dropdown list redirecting users when they select an option, you can use a javascript code like this:

  1. <select onChange='location=this.options[this.selectedIndex].value'>

  2. <option selected>pick one</option>

  3. <option value='http://www.google.com'>google</option>

  4. <option value='http://www.yahoo.com>yahoo</option>

  5. </select>