收集了28个Java开发常用的工具类库源码，比如Base64.java加密解密、FileHelper.java文件帮助类、FileUploadUtil.java文件上传类、MD5Encrypt.java MD5加密类、MyFileFilter.java文件滤镜类、DateHandler.java类、Counter.java功能计数类等，另外还有CConst.java、Escape.java、SimpleConfig.java、StringHelper.java、CharTools.java等。CTool.java中收集Java编程中WEB开发常用到的一些工具，为避免生成此类的实例，构造方法被申明为private类型的-Collection of 28 popular Java development tools library source code, such as Base64.java encryption and decryption, FileHelper.java file helper class, FileUploadUtil.java file upload class, MD5Encrypt.java MD5 encryption class, MyFileFilter.java file filter class, DateHandler . java class, Counter.java feature count, etc., in addition to CConst.java, Escape.java, SimpleConfig.java, StringHelper.java, CharTools.java so on. CTool.java collected some of the Java programming tools used to WEB development, in order to avoid the formation of such an instance, the constructor is declared as private types