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1、精选优质文档-倾情为你奉上THE TECHNIQUE DEVELOPMENT HISTORY OF JSPBy: Kathy Sierra and Bert BatesSource: Servlet & JSPThe Java Server Pages( JSP) 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
2、 JavaScript( SSJS) and the Active Server Pages(ASP) 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 Sun company of, any factory can carry out t
3、he JSP on own system. The After Sun release the JSP (the Java Server Pages) 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. Ac
4、cording to the Sun parlance, the JSP can adapt to include the 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,
5、 say perhaps to is a Guide only, if the reader needs the more detailed information, pleasing the book of consult the homologous JSP.1.1 GENERALIZEThe JSP (Java Server Pages) is from the company of Sun Microsystems initiate, the many companies the participate to the build up the together of the a kin
6、d the of dynamic the state web the page technique standard, the it have the it 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 are very alike. Both all provide the ability that mixes wit
7、h a certain procedure code and is explain by the language engine to carry out the 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 se
8、rvlets. However, this underlying equivalence does not mean that servlets and JSP pages 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
9、computer platform in the Java programming language you could also do in assembly language. 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 qu
10、otes, and no lurking Java syntax. You can use standard Web-site development tools. 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 conce
11、ntrate on the presentation layer. On large projects, this division is very important. 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 sho
12、uld stop using servlets and use only JSP instead. By no means. Almost all projects 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 appropriate tool for the job, and
13、servlets, by themselves, do not complete your toolkit.1.2 SOURCE OF JSPThe technique 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 J
14、SP becomes the dynamic state on the page contents. (the contents changes according to the claim of)The Java Servlet is a technical foundation of JSP, and the large Web applies the development of the procedure to need the Java Servlet to match with the JSP and then can complete, this name of Servlet
15、comes from the Applet, the local translation method of now is a lot of, this book in order not to misconstruction, decide 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
16、etc. Web procedure development the function of the tool in fact, at use the Java Servlet hereafter, the customer need not use 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
17、 terrace circulate. Many servers of Web all support the Servlet, even not support the Servlet server of Web directly and can also pass the additional applied server and the mold pieces to support the Servlet. Receive benefit in the characteristic(典型的) of the Java cross-platform, the Servlet is also
18、a terrace（平台） irrelevant, actually, as long as match the norm of Java Servlet, the Servlet is complete to have nothing to do with terrace 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 th
19、e each claims, and make use of the multi-threading mechanism can at the same time for several claim service, therefore the efficiency 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
20、 of output the HTML language sentence to carry out the dynamic state web page of, if develop the whole website with the Java Servlet, the integration(集成) 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 Serv
21、let, the SUN released the JSP.A number of years ago, Marty was invited to attend a small 20-person industry(产业) roundtable discussion on software technology. Sitting in the seat next to Marty was James Gosling, inventor(发明) of the Java programming language. Sitting several seats away was a high-leve
22、l manager from a very large software company in Redmond, Washington. During the discussion, the moderator brought up the subject of Jini, which 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
23、that it seemed to be an excellent idea. He went on to say that they would keep an eye on it, and if it seemed to be catching on, they would follow his companys usual embrace（信奉） and extend strategy（战略）. At this point, Gosling lightheartedly interjected You mean disgrace(耻辱) and distend(使扩张). Now, th
24、e grievance（不满） that Gosling was airing(风干；通风) was that he felt that this company would take technology from other companies and suborn（收买） it for their own purposes. But guess(认为，猜测) what? The shoe is on the other foot here .The Java community(社区，团体) did not invent(发明，创造) the idea of designing page
25、s as a mixture(混合) of static HTML and dynamic code marked(标记) with special tags(标签). For example, Cold Fusion did it years earlier. Even ASP (a product from the very software company of the aforementioned manager) popularized this approach(方法) before JSP came along and decided to jump on the bandwag
26、on(流行). In fact, JSP not only adopted the general(普通的) idea, it even used many of the same special tags as ASP did.The JSP is an establishment(确定，制定) at the model of Java servlets on of the expression layer(层) technique(技术), it makes plait(编) write the HTML to become more simple. Be like the SSJS, i
27、t also allows(允许) you carry the static state HTML contents and servers the script(脚本) mix to put together the born dynamic state exportation(出口). JSP the script language that the Java is the tacit(缄默的，不言而喻的) approval(认可), however, be like the ASP and can use other languages( such as JavaScript and V
28、BScript), the norm of JSP also allows to use other languages.1.3JSP CHARACTERISTICSIs a service according to the script language in some one language of the statures system this kind of discuss(论述), the JSP should be see make is a kind of script language. However, be a kind of script language, the J
29、SP seemed to be too strong again, almost can use all Javas in the JSP.Be a kind of according to text originally(最初) of, take manifestation(表现) 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 m
30、ake contents and manifestation that simple way that logic(逻辑) separate. Separate the contents and advantage of logical manifestations is, the personnel(人员的) who renews(更新) the page external(外部的) appearance(外观) need not know the code of Java, and renew the JavaBeans personnel also need not be design
31、the web page of expert(熟练的，专家) in hand, can use to take the page of JavaBeans JSP to define the template(模板) of Web, to build up a form have the alike external appearance of the website that page constitute(组成). JavaBeans completes(完成) the data to provide, having no code of Java in the template thus
32、(因此), this means that these templates can be written the personnel by a HTML plait(编) to support. Certainly, can also make use of the Java Servlet to control the logic of the website, adjust(调整) through the Java Servlet to use the way of the document of JSP to separate website of logic and contents.
33、Generally speaking, in actual(真实的，目前的)engine(引擎) of JSP, the page of JSP is the edit and translate(翻译，转化) type while carry out, not explain the type of. Explain the dynamic state web page development tool of the type, such as ASP, PHP3 etc., because speed etc. reason, have already cant satisfy(令人满意的
34、) current the large electronic commerce(贸易) needs applied, traditional development techniques are all at to edit and translate the executive(执行的) way change, such as the ASP ASP+;PHP3 PHP4.In the JSP norm book, did not request the procedure in the JSP code part (be called the Scriptlet) and must wri
35、te 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, edit and translate for the Servlet to carry out of. Write according to the norm of JSP, have no
36、 Scriptlet of relation with Java also is can of, however, mainly lie in the ability and JavaBeans, the Enterprise JavaBeans because of the JSP strong function to work together, so even is the Scriptlet part not to use the Java, edit and translate of performance code also should is related with Java.
37、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 module develops for the web page of the center and the page develops for the web page of the center fi
38、rst. The SSJS and ASP are all in several year ago to 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 enter the original web page entirely heap what better solve the method. This kind of model that ta
39、ke 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 applies the procedure. The expression logic write in the script environment was lock in the page,
40、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 change an external appearance that applies the procedure but do not want to break with its llied b
41、usiness 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 mature, no one would like to rewrite those logics for their applied procedure.HTML and sketch the
42、 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 script and the HTML contents knot to the server to put together. Chien but speech, apply th
43、e 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 look for the better method of build up the Web application procedure, the module spreads in c
44、ustomers 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 by the fast application procedure development( RAD) tool. These techniques make the expert
45、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 take module as the central development terrace, the JSP appeared. It with the JavaB
46、eans and Enterprise JavaBeans( EJB) 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 of JavaBeans creation or send a present in return. Because of the property th
47、at 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( Tags) to use the JavaBeans that the deluxe developer of Java establish. The developer of Java not only can establish and use the JavaBeans,
48、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 HTTP. In basic claim model, a claim directly was send to JSP page in. The code of JSP controls to carry on hour
49、of the logic processing and module of JavaBeans 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 EJBs. Moreover, 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(追逐) the code of Java that label of JSP, code of Java in the JSP page even all converts(转化，转变