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1、THE TECHNIQUE DEVELOPMENT HISTORY OF JSPBy:Kathy Sierra and Bert BatesSource:Servlet&JSPThe Java Server Pages is a kind of according to web of the script plait distance technique, similar carries the script language of Java in the server of the Netscape company of server- side JavaScript and the Act

2、ive Server Pages of the Microsoft.JSP compares the SSJS and ASP to have better can expand sex, and it is no more exclusive than any factory or some one particular server of Web.Though the norm of JSP is to be draw up by the Sun company of, any factory can carry out the JSP on own system. The After S

3、un release the JSP formally, the this kind of new Web application development technique very quickly caused the peoples concern.JSP provided a special development environment for the Web application that establishes the high dynamic state.According to the Sun parlance, the JSP can adapt to include t

4、he Apache WebServer, IIS4.0 on the market at inside of 85% server product.This chapter will introduce the related knowledge of JSP and Databases, and JavaBean related contents, is all certainly rougher introduction among them basic contents, say perhaps to is a Guide only, if the reader needs the mo

5、re detailed information, pleasing the book of consult the homologous JSP.1.1 GENER ALIZEThe JSP is from the company of Sun Microsystems initiate, the many companies the participate to the build up the together of the a kind the of dynamic the state web the page technique standard, the it have the it

6、 in the construction the of the dynamic state the web page the strong but the do not the especially of the function.JSP and the technique of ASP of the Microsoft is very alike.Both all provide the ability that mixes with a certain procedure code and is explain by the language engine to carry out the

7、 procedure code in the code of HTML.Underneath we are simple of carry on the introduction to it.JSP pages are translated into servlets. So, fundamentally, any task JSP pages can perform could also be accomplished by servlets. However, this underlying equivalence does not mean that servlets and JSP p

8、ages are equally appropriate in all scenarios. The issue is not the power of the technology, it is the convenience, productivity, and maintainability of one or the other. After all, anything you can do on a particular computer platform in the Java programming language you could also do in assembly l

9、anguage. But it still matters which you choose.JSP provides the following benefits over servlets alone: It is easier to write and maintain the HTML. Your static code is ordinary HTML: no extra backslashes, no double quotes, and no lurking Java syntax. You can use standard Web-site development tools.

10、 Even HTML tools that know nothing about JSP can be used because they simply ignore the JSP tags. You can divide up your development team. The Java programmers can work on the dynamic code. The Web developers can concentrate on the presentation layer. On large projects, this division is very importa

11、nt. Depending on the size of your team and the complexity of your project, you can enforce a weaker or stronger separation between the static HTML and the dynamic content.Now, this discussion is not to say that you should stop using servlets and use only JSP instead. By no means. Almost all projects

12、 will use both. For some requests in your project, you will use servlets. For others, you will use JSP. For still others, you will combine them with the MVC architecture . You want the apGFDGpropriate tool for the job, and servlets, by themselves, do not complete your toolkit.1.2 SOURCE OF JSPThe te

13、chnique of JSP of the company of Sun, making the page of Web develop the personnel can use the HTML perhaps marking of XML to design to turn the end page with format.Use the perhaps small script future life of marking of JSP becomes the dynamic state on the page contents.The Java Servlet is a techni

14、cal foundation of JSP, and the large Web applies the development of the procedure to need the Java Servlet to match with with the JSP and then can complete, this name of Servlet comes from the Applet, the local translation method of now is a lot of, this book in order not to misconstruction, decide

15、the direct adoption Servlet but dont do any translation, if reader would like to, can call it as small service procedure.The Servlet is similar to traditional CGI, ISAPI, NSAPI etc. Web procedure development the function of the tool in fact, at use the Java Servlet hereafter, the customer need not u

16、se again the lowly method of CGI of efficiency, also need not use only the ability come to born page of Web of dynamic state in the method of API that a certain fixed Web server terrace circulate.Many servers of Web all support the Servlet, even not support the Servlet server of Web directly and can

17、 also pass the additional applied server and the mold pieces to support the Servlet.Receive benefit in the characteristic of the Java cross-platform, the Servlet is also a terrace irrelevant, actually, as long as match the norm of Java Servlet, the Servlet is complete to have nothing to do with terr

18、ace and is to have nothing to do with server of Web.Because the Java Servlet is internal to provide the service by the line distance, need not start a progress to the each claimses, and make use of the multi-threading mechanism can at the same time for several claim service, therefore the efficiency

19、 of Java Servlet is very high.But the Java Servlet also is not to has no weakness, similar to traditional CGI, ISAPI, the NSAPI method, the Java Servlet is to make use of to output the HTML language sentence to carry out the dynamic state web page of, if develop the whole website with the Java Servl

20、et, the integration process of the dynamic state part and the static state page is an evil-foreboding dream simply.For solving this kind of weakness of the Java Servlet, the SUN released the JSP.A number of years ago, Marty was invited to attend a small 20-person industry roundtable discussion on so

21、ftware technology. Sitting in the seat next to Marty was James Gosling, inventor of the Java programming language. Sitting several seats away was a high-level manager from a very large software company in Redmond, Washington. During the discussion, the moderator brought up the subject of Jini, which

22、 at that time was a new Java technology. The moderator asked the manager what he thought of it, and the manager responded that it was too early to tell, but that it seemed to be an excellent idea. He went on to say that theywould keep an eye on it, and if it seemed to be catching on, they would foll

23、ow his companys usual embrace and extend strategy. At this point, Gosling lightheartedly interjected You mean disgrace and distend. Now, the grievance that Gosling was airing was that he felt that this company would take technology from other companies and suborn it for their own purposes. But guess

24、 what?The shoe is on the other foot here. The Java community did not invent the idea of designing pages as a mixture of static HTML and dynamic code marked with special tags. For example, ColdFusion did it years earlier. Even ASP popularized this approach before JSP came along and decided to jump on

25、 the bandwagon. In fact, JSP not only adopted the general idea, it even used many of the same special tags as ASP did.The JSP is an establishment at the model of Java servlets on of the expression layer technique, it makes the plait write the HTML to become more simple.Be like the SSJS, it also allo

26、ws you carry the static state HTML contents and servers the script mix to put together the born dynamic state exportation.JSP the script language that the Java is the tacit approval, however, be like the ASP and can use other languages, the norm of JSP also allows to use other languages.1.3JSP CHARA

27、CTERISTICSIs a service according to the script language in some one language of the statures system this kind of discuss, the JSP should be see make is a kind of script language.However, be a kind of script language, the JSP seemed to be too strong again, almost can use all Javas in the JSP.Be a kin

28、d of according to text originally of, take manifestation as the central development technique, the JSP provided all advantages of the Java Servlet, and, when combine with a JavaBeans together, providing a kind of make contents and manifestation that simple way that logic separate.Separate the conten

29、ts and advantage of logical manifestations is, the personnel who renews the page external appearance need not know the code of Java, and renew the JavaBeans personnel also need not be design the web page of expert in hand, can use to take the page of JavaBeans JSP to define the template of Web, to b

30、uild up a from have the alike external appearance of the website that page constitute.JavaBeans completes the data to provide, having no code of Java in the template thus, this means that these templates can be written the personnel by a HTML plait to support.Certainly, can also make use of the Java

31、 Servlet to control the logic of the website, adjust through the Java Servlet to use the way of the document of JSP to separate website of logic and contents.Generally speaking, in actual engine of JSP, the page of JSP is the edit and translate type while carry out, not explain the type of. Explain

32、the dynamic state web page development tool of the type,such as ASP, PHP3 etc., because speed etc. reason, have already cant satisfy current the large electronic commerce needs appliedly, traditional development techniques are all at to edit and translate the executive way change, such as the ASP AS

33、P+;PHP3 PHP4.In the JSP norm book, did not request the procedure in the JSP code part and must write with the Java definitely.Actually, have some engines of JSP are adoptive other script languages such as the EMAC- Script, etc., but actually this a few script languages also are to set up on the Java

34、, edit and translate for the Servlet to carry out of.Write according to the norm of JSP, have no Scriptlet of relation with Java also is can of, however, mainly lie in the ability and JavaBeans, the Enterprise JavaBeanses because of the JSP strong function to work together, so even is the Scriptlet

35、part not to use the Java, edit and translate of performance code also should is related with Java.1.4JSP MECHANISMTo comprehend the JSP how unite the technical advantage that above various speak of, come to carry out various result easily, the customer must understand the differentiation of the modu

36、le develops for the web page of the center and the page develops for the web page of the center first. The SSJS and ASP are all in several year agoto release, the network of that time is still very young, no one knows to still have in addition to making all business, datas and the expression logic e

37、nter the original web page entirely heap what better solve the method.This kind of model that take page as the center studies and gets the very fast development easily.However, along with change of time, the people know that this kind of method is unwell in set up large, the Web that can upgrade app

38、lies the procedure.The expression logic write in the script environment was lock in the page, only passing to shear to slice and glue to stick then can drive heavy use.Express the logic to usually mix together with business and the data logics, when this makes be the procedure member to try to chang

39、e an external appearance that applies the procedure but do not want to break with its llied business logic, apply the procedure of maintenance be like to walk the similar difficulty on the eggshell.In fact in the business enterprise, heavy use the application of the module already through very matur

40、e, no one would like to rewrite those logics for their applied procedure.HTML and sketch the designer handed over to the implement work of their design the Web plait the one who write, make they have to double work- Usually is the handicraft plait to write, because have no fit tool and can carry the

41、 script and the HTML contents knot to the server to put together.Chien but speech, apply the complexity of the procedure along with the Web to promote continuously, the development method that take page as the center limits sex to become to get up obviously. At the same time, the people always at lo

42、ok for the better method of build up the Web application procedure, the module spreads in customers machine/ server the realm.JavaBeans and ActiveX were published the company to expand to apply the procedure developer for Java and Windows to use to come to develop the complicated procedure quickly b

43、y the fast application procedure development tool.These techniques make the expert in the some realm be able to write the module for the perpendicular application plait in the skill area, but the developer can go fetch the usage directly but need not control the expertise of this realm.Be a kind of

44、take module as the central development terrace, the JSP appeared.It with the JavaBeans and Enterprise JavaBeans module includes the model of the business and the data logic for foundation, provide a great deal of label and a script terraces to use to come to show in the HTML page from the contents o

45、f JavaBeans creation or send a present in return.Because of the property that regards the module as the center of the JSP, it can drive Java and not the developer of Java uses equally.Not the developer of Java can pass the JSP label to use the JavaBeans that the deluxe developer of Java establish.Th

46、e developer of Java not only can establish and use the JavaBeans, but also can use the language of Java to come to control more accurately in the JSP page according to the expression logic of the first floor JavaBeans. See now how JSP is handle claim of .In basic claim model, a claim directly was se

47、nd to JSP page in.The code of JSP controls to carry on hour of the logic processing and module of JavaBeanses hand over with each other, and the manifestation result in dynamic state bornly, mixing with the HTML page of the static state HTML code.The Beans can be JavaBeans or module of Es.Moreover,

48、the more complicated claim model can see make from is request other JSP pages of the page call sign or Java Servlets.The engine of JSP wants to chase the code of Java that the label of JSP, code of Java in the JSP page even all converts into the big piece together with the static state HTML contents

49、 actually.These codes piece was organized the Java Servlet that customer can not see to go to by the engine of JSP, then the Servlet edits and translate them automatically byte code of Java.Thus, the visitant that is the website requests a JSP page, under the condition of it is not knowing, an alrea

50、dy born, the Servlet actual full general that prepared to edit and translate completes all works, very concealment but again and efficiently.The Servlet is to edit and translate of, so the code of JSP in the web page does not need when the every time requests that page is explain.The engine of JSP n

51、eed to be edit and translate after Servlet the code end is modify only once, then this Servlet that editted and translate can be carry out.The in view of the fact JSP engine auto is born to edit and translate the Servlet also, need not procedure member begins to edit and translate the code, so the J

52、SP can bring vivid sex that function and fast developments need that you are efficiently.Compared with the traditional CGI, the JSP has the equal advantage.First, on the speed, the traditional procedure of CGI needs to use the standard importation of the system to output the equipments to carry out

53、the dynamic state web page born, but the JSP is direct is mutually the connection with server.And say for the CGI, each interview needs to add to add a progress to handle, the progress build up and destroy by burning constantly and will be a not small burden for calculator of be the server of Web.Th

54、e next in order, the JSP is specialized to develop but design for the Web of, its purpose is for building up according to the Web applied procedure, included the norm and the tool of a the whole set.Use the technique of JSP can combine a lot of JSP pages to become a Web application procedure very ex

55、pediently. JSP的技术发展历史 Kathy Sierra and Bert Bates来源： Servlet&JSPJava Server Pages是一种基于web的脚本编程技术,类似于网景公司的服务器端Java脚本语言server-side JavaScript和微软的Active Server Pages.与SSJS和ASP相比,JSP具有更好的可扩展性,并且它不专属于任何一家厂商或某一特定的Web服务器.尽管JSP规范是由Sun公司制定的,但任何厂商都可以在自己的系统上实现JSP. 在Sun正式发布JSP之后,这种新的Web应用开发技术很快引起了人们的关注.JSP为创建高度

56、动态的Web应用提供了一个独特的开发环境.按照Sun的说法,JSP能够适应市场上包括Apache WebServer、IIS4.0在内的85%的服务器产品.本文将介绍JSP相关的知识,以与JavaBean的相关内容,当然都是比较粗略的介绍其中的基本内容,仅仅起到抛砖引玉的作用,如果读者需要更详细的信息,请参考相应的JSP的书籍.1.1 概述JSP是由Sun Microsystems公司倡导、许多公司参与一起建立的一种动态网页技术标准,其在动态网页的建设中有其强大而特别的功能.JSP与Microsoft的ASP技术非常相似.两者都提供在HTML代码中混合某种程序代码、由语言引擎解释执行程序代码的

57、能力.下面我们简单的对它进行介绍.JSP页面最终会转换成servlet.因而,从根本上,JSP页面能够执行的任何任务都可以用servlet来完成.然而,这种底层的等同性并不意味着servlet和JSP页面对于所有的情况都等同适用.问题不在于技术的能力,而是二者在便利性、生产率和可维护性上的不同.毕竟,在特定平台上能够用Java编程语言完成的事情,同样可以用汇编语言来完成,但是选择哪种语言依旧十分重要.和单独使用servlet相比,JSP提供下述好处：JSP中HTML的编写与维护更为简单.JSP中可以使用常规的HTML：没有额外的反斜杠,没有额外的双引号,也没有暗含的Java语法.能够使用标准的

58、开发工具.即使是那些对JSP一无所知的HTML工具,我们也可以使用,因为它们会忽略JSP标签JSP tags.可以对开发团队进行划分.Java程序员可以致力于动态代码.Web开发人员可以将经理集中在表示层presentation layer上.对于大型的项目,这种划分极为重要.依据开发团队的大小,与项目的复杂程度,可以对静态HTML和动态内容进行弱分离weaker separation和强分离stronger separation.此处的讨论并不是说人们应该放弃使用servlet而仅仅使用JSP.事实上,几乎所有的项目都会同时用到这两种技术.在某些项目中,更适宜选用servlet,而针对项目中

59、的某些请求,我们可能会在MVC构架下组合使用这两项技术.我们总是希望用适当的工具完成相对应的工作,仅仅是servlet并不一定能够胜任所有工作.1.2 JSP的由来Sun公司的JSP技术,使Web页面开发人员可以使用HTML或者XML标识来设计和格式化最终页面.使用JSP标识或者小脚本来生成页面上的动态内容.Java Servlet是JSP技术的基础,而且大型的Web应用程序的开发需要Java Servlet和JSP配合才能完成,Servlet这个名称源于Applet,现在国内的翻译方式很多,本书为了避免误会,决定直接采用Servlet而不做任何翻译,读者如果愿意,可以称之为小服务程序.Ser

60、vlet其实和传统的CGI、ISAPI、NSAPI等Web程序开发工具的作用是相似的,在使用Java Servlet以后,用户不必再使用效率低下的CGI方式,也不必使用只能在某个固定Web服务器平台运行的API方式来动态生成Web页面.许多Web服务器都支持Servlet,即使不直接支持Servlet的Web服务器也可以通过附加的应用服务器和模块来支持Servlet.得益于Java的跨平台的特性,Servlet也是平台无关的,实际上,只要符合Java Servlet规范,Servlet是完全与平台无关且是与Web服务器无关的.由于Java Servlet内部是以线程方式提供服务,不必对于每个请

61、求都启动一个进程,并且利用多线程机制可以同时为多个请求服务,因此Java Servlet效率非常高.但Java Servlet也不是没有缺点,和传统的CGI、ISAPI、NSAPI方式相同,JavaServlet是利用输出HTML语句来实现动态网页的,如果用Java Servlet来开发整个,动态部分和静态页面的整合过程会非常难以实现.为了解决Java Servlet的这种缺点,SUN推出了JSP.许多年前,Marty受到邀请,参加一个有关软件技术的小型研讨会.坐在Marty旁边的人是James Gosling- Java编程语言的发明者.隔几个位置,是来自华盛顿一家大型软件公司的高级经理.在

62、讨论过程中,研讨会的主席提出了Jini的议题,这在当时是一项新的Java技术.主席向该经理询问他的想法.他回答说,虽然现在言之过早,但这看起来会是非常有前途的一项技术.他们会持续关注这项技术,如果这项技术变得流行起来,他们会遵循公司的接受并扩充的策略.此时, Gosling随意地插话说你的意思其实就是不接受且不扩充.在此, Gosling的抱怨显示出,他感到这个公司会从其他公司那里拿走技术,用于他们自己的目的.出人意料的是,形势已经完全不同.Java团队并没有发明这一思想-将页面设计成由静态HTML和用特殊标签标记的动态代码混合组成.ColdFusion多年前就已经这样做了.甚至ASP都在JS

63、P出现之前推广了这种方式.实际上,JSP不只采用了这种通用概念,它甚至使用许多和ASP相同的特殊标签.JSP是建立在Java servlets模型之上的表达层技术,它使编写HTML变得更简单.像SSJS一样,它也允许你将静态HTML内容与服务器端脚本混合起来生成动态输出.JSP把Java作为默认的脚本语言,然而,就像ASP可以使用其他语言一样,JSP规范也允许使用其他语言.1.3JSP的特点按照脚本语言是服务于某一个子系统的语言这种论述,JSP应当被看作是一种脚本语言.然而,作为一种脚本语言,JSP又显得过于强大了,在JSP中几乎可以使用全部的Java类.作为一种基于文本的、以显示为中心的开发

64、技术,JSP提供了Java Servlet的所有好处,并且,当与一个JavaBeans类结合在一起时,JSP提供了一种使内容和显示逻辑分开的简单方式.分开内容和显示逻辑的好处是,更新页面外观的人员不必懂得Java代码,而更新JavaBeans类的人员也不必是设计网页的行家里手,就可以用带JavaBeans类的JSP页面来定义Web模板,以建立一个由具有相似的外观的页面组成的.JavaBeans类完成数据提供,这样在模板中就没有Java代码,这意味着这些模板可以由一个HTML编写人员来维护.当然,也可以利用Java Servlet来控制的逻辑,通过Java Servlet调用JSP文件的方式来将的逻辑和内容分离.一般来说,在实际的JSP引擎中,JSP页面在执行时是编译式,而不是解释式的.解释式的动态网页开发工具如ASP、PHP3等由于速度等原因已经满足不了当前大型电子商务应用的需要了,传统的开发技术都在向编译执行的方式改变,如ASPASP+；PHP3PHP4.在JSP规范书中,并没有明确要求JSP中的程序代码部分一定要用Java来写.实际上,有一些JSP引擎就是