Research And Implementation Of File Rewritting

With the increasing development of electronic and information technology, rewriting techniques are becoming increasingly important whether to the significance of software modification and reuse or to the role of commercial fields. Consequently, it is valuable to design and implement some effective rewriting systems for widespread rewriting files.Firstly, this paper introduced the research status of file rewriting technology. According to significance of application and theory, this paper choose three file types as the object of rewriting and the target of hyperlink, such as PDF, Flash and Java applet, which are widely used in web service rewriting. On that basis, after analyzing a large number of byte code of test cases and confirming the hyperlink information and characteristics of three file types in the byte code, this paper respectively designed the three file-rewriting systems for the above three file types in demand. Secondly, this paper gradually completed the three core modules of web service rewriting, for example the file decompression/compression module, byte code parsing module and the URL rewriting module. There were many important technologies for this implementation, such as byte code dynamic rewriting technology, byte code verification and correction techniques, reflection rewriting technology, URL restore and rewriting technology of property assignment, java applets automatic signature technology, Base64encryption/decryption and JNI technology. Thirdly, this paper made a bottleneck analysis with the method of TPTP, then tested the functionality and velocity. The test results showed that it fulfilled requirement. Finally, this paper summarized the current existing issues and provided some more directions.