The main formats of e-books are PDF, EXE, CHM, UMD, PDG, JAR, PDB, TXT, BRM, etc. At present, many popular mobile devices support its reading format. The common e-book formats of mobile terminals are UMD, JAR and TXT. Umd is a mobile e-book file format created by Pocket Academy. Because of its early launch, excellent compression ratio and characters, it supports mixed layout of pictures and texts and has become the mainstream file format of mobile e-books. You can read novels, magazines, comics and comic books, and you can set font size, line spacing, color, background color and background picture. A 65438+ million-word book can be stored in 100K, and it is quick to open the book and jump to the directory. Support bookmarks, directory management and full-text search. Rotatable screen, automatic scrolling reading. Support embedded video and audio clips. WMLC is an earlier format of mobile e-book, which is actually a WAP webpage file. Generally, a data cable is used to connect a computer and download related software. In a real sense, this reading method can't be called a mobile phone e-book. In contrast, the functions of JAVA e-books are much richer, such as setting bookmarks, jumping pages and so on. Users can access the JAVA platform of mobile operators (such as Monternet) through mobile terminals supporting JAVA and GPRS, and download novels provided by mobile operators. Generally, it is similar to mobile phone applications, with jar and jad suffixes as the main suffix. Although TXT format is simple, it is an epoch-making progress for mobile e-books. At present, there are some reading softwares specially designed for mobile e-books, such as MicroReader and ReadManiac. Through such reading software, the vast TXT file resources on the Internet can be transformed into mobile e-books. Take the micro-reader software as an example, it can automatically adjust the speed to turn pages, set bookmarks, set font spacing and switch codes, making the mobile phone more like a multifunctional e-book reader terminal. The formats of JAVA mobile e-books are generally jar and JAD, in which JAD file is a description file, which describes the information of JAR file. Some mobile phones do not support reading JAR directly (this is caused by the mobile phone security policy), so JAD files are needed. There are only a few such mobile phones. Java runs on the java virtual machine, that is, KVM, and many low-end models can also support java, which determines that the application scope of Java format is quite extensive. Because java can provide rich interactive behaviors, it is the best in supporting graphics, text and multimedia. In addition, the reader and the text are packaged together (jar), so you only need to install it to read, and you don't need to install another reader or download e-books. Compared with previous e-book reading devices, the biggest advantage of mobile phones is convenience and portability. But its disadvantages are limited screen reading and few readable resources. At present, the design of mobile phones is polarized. One trend is getting smaller and smaller, taking the road of dexterity and exquisiteness, and the other trend is getting bigger and bigger, taking the road of rich and perfect functions and moving closer to PDA. Undoubtedly, only this trend is suitable for the development of mobile e-books. However, for most users at present, it is still inconvenient to read tens of thousands of words of e-books with a mobile phone that displays several lines per screen.