【正文】 t you visit every day.Of course, popularity alone is no proof of good technology. Numerous counterexamples abound. But our point is that you are not experimenting with a new and unproven technology when you work with serverside Java.References：[1]　Clifton . Branham, Arthur Jonathan .Servlets and JSP in an undergraduate database course[J].Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications,2003(3):14901496.[2]　Kirkegaard, analysis for Java servlets and JSP[J].Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics),2006(4):336352.[3]　Nakaike, Splitting for improving execution performance[J].Proceedings International Symposium on Applications and the Internet,2004[8]:117126.[4]　Hassan, Doaa .Developing a security typed java servlet[J].Proceedings The 4th International Symposium on Information Assurance and Security,2008(10):215220.Servlet和JSP技術(shù)簡述Nagle ，Wiegley摘要：Servlet程序在服務(wù)器端運(yùn)行，動(dòng)態(tài)地生成Web頁面與傳統(tǒng)的CGI和許多其他類似CGI的技術(shù)相比，Java Servlet具有更高的效率，更容易使用，功能更強(qiáng)大，具有更好的可移植性，更節(jié)省投資。 see ), so industry support for servlets is being even more pervasive. InexpensiveA number of free or very inexpensive Web servers are good for development use or deployment of low or mediumvolume Web sites. Thus, with servlets and JSP you can start with a free or inexpensive server and migrate to more expensive servers with highperformance capabilities or advanced administration utilities only after your project meets initial success. This is in contrast to many of the other CGI alternatives, which require a significant initial investment for the purchase of a proprietary package.Price and portability are somewhat connected. For example, Marty tries to keep track of the countries of readers that send him questions by . India was near the top of the list, probably behind the . Marty also taught one of his JSP and servlet training courses (see ) in Manila, and there was great interest in servlet and JSP technology there.Now, why are India and the Philippines both so interested? We surmise that the answer is twofold. First, both countries have large pools of welleducated software developers. Second, both countries have (or had, at that time) highly unfavorable currency exchange rates against the . dollar. So, buying a specialpurpose Web server from a . pany consumed a large part of early project funds.But, with servlets and JSP, they could start with a free server: Apache Tomcat (either standalone, embedded in the regular Apache Web server, or embedded in Microsoft IIS). Once the project starts to bee successful, they could move to a server like Caucho Resin that had higher performance and easier administration but that is not free. But none of their servlets or JSP pages have to be rewritten. If their project bees even larger, they might want to move to a distributed (clustered) environment. No problem: they could move to Macromedia JRun Professional, which supports distributed applications (Web farms). Again, none of their servlets or JSP pages have to be rewritten. If the project bees quite large and plex, they might want to use Enterprise JavaBeans (EJB) to encapsulate their business logic. So, they might switch to BEA WebLogic or Oracle9i AS. Again, none of their servlets or JSP pages have to be rewritten. Finally, if their project bees even bigger, they might move it off of their Linux box and onto an IBM mainframe running IBM WebSphere. But once again, none of their servlets or JSP pages have to be rewritten. SecureOne of the main sources of vulnerabilities in traditional CGI stems from the fact that the programs are often executed by generalpurpose operating system shells. So, the CGI programmer must be careful to filter out characters such as backquotes and semicolons that are treated specially by the shell. Implementing this precaution is harder than one migh