里面有5个工程文件，功能分别为搜索引擎建立索引与查询功能、java的MD5算法、HashMap的功能、FileDao文件操作大全、动态生成验证码，可定制字体，图片背景，和干扰线等。-There are five project file, function set up for search engine indexing and query functions, java the MD5 algorithm, HashMap function, FileDao file operations Daquan, dynamically generated Verification Code, customizable fonts, pictures, background, and interference lines.