Java programing net techlogy

Log4J是Apache软件基金会Jakarta项目下的一个子项目，是用Java编写的优秀日志工具包。通过Log4J可以在不修改代码的情况下，方便、灵活地控制任意粒度的日志信息的开启或关闭，然后使用定制的格式，把日志信息输出到一个或多个需要的地方。 最令人感兴趣的就 是，这些可以通过一个配置文件来灵活地进行配置，而不需要修改应用的代码。 -Log4J is the Apache Software Foundation Jakarta under a subproject is prepared to use Java logging toolkit outstanding. Log4J can be adopted without amending the code, the convenience, flexibility to control arbitrary granularity of the log information of the open or closed, then use the custom format, the log information output to one or more needed. Most interesting is that these can be through a configuration file to configure a flexible manner, without modifying application code.

用java写的聊天程序。 -Written with java chat program.

一个遍历文件系统目录结构的程序并能够将其结构用字符打印出来-A traverse file system directory structure of the program and its structure can be printed with characters

老外的在线考试，用STRUTS做的，值得学习！-foreigner online examinations. STRUTS do, it is worth learning!

本人最近在为某统计局开发项目时,涉及到在网页上动态生成图片的问题，费了一天的时间,终于搞定,为帮助大家在以后遇到同样的问题时不走弯路，现将设计思想及源代码公布出来，与大家共勉。以下代码在Windows2000成功测试通过，Web应用服务器采用Allaire公司的Jrun3.0。-I recently Statistics for the development of a project that involves the website dynamically generated pictures, charges the day time, and finally get to help you in the future encountered the same problem without detours, now design and source code announced, we shall. The following code in Windows 2000 through successfully tested, Web Application Server using Allaire"s Jrun3.0.

回文数的判断，输入一个字符串，不考虑标点符号和空格，只考虑字母或数字，判断它是否回文数-palindrome number of judgment, the importation of a string of not punctuation and spaces, only letters or numbers, to judge whether it palindrome number

Lex是美国Bell实验室用C语言研制的一个词法分析程序自生成工具。它的基本原理就是使用正则表达式扫描匹配文本，并为每一个匹配模式定义一些操作，当用C语言作宿主语言时，这些操作都由C语言实现。一种匹配的正则表达式可能会包含相关的动作。这一动作可能还包括返回一个标记。当 Lex 接收到文件或文本形式的输入时，它试图将文本与正则表达式进行匹配。它一次读入一个输入字符，直到找到一个匹配的模式。如果能够找到一个匹配的模式，Lex 就执行相关的动作（可能包括返回一个标记）。-Lex Bell Laboratories of the United States with C language developed by a lexical analysis tool generated from the process. Its fundamental principle is to use a regular expression matching text scanning, and for every definition of a matching model for operation, when the C language of the host language, these operators by C language. A match of which is likely to contain expressions related to the moves. This action may also include the return of a marker. When Lex reception of the document or text input, it is trying to text and is a regular expression matching. It read an input into the characters, until they found a matching pattern. If they can find a matching model, Lex on the implementation of the action (which may include a return of markings).

模拟现在的计算器，可以计算加减乘除等多种运算.-Analog calculator now, we can calculate a variety of operations such as addition and subtraction multiplication and division.

sha-1算法的Java实现，可以作为学习sha-1算法的实践参考文档。-sha-1 algorithm realize Java can be used as sha-1 algorithm for learning the practice of reference documentation.

一个相当不错的smtp程序-a pretty good smtp procedures