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The technique development history of JSP
Writer:Bluce Rakel
The 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 JavaScript( SSIS) 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 the Sun company of,any factory
can carry out the ISP 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 people's
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 the Apache WebServer,IS4.0 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 more detailed
information,pleasing the book of consult the homologous JSP.
A.Generalize
The 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 kind 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 is very alike.
Both all provide the ability that mixs with 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.
B.JSP characteristics
Is 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 kind 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 contents 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 build 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 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 contentses.
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 the dynamic state web
page development tool of the type,such as ASP,PHP3 etc,because speed etc.
reason,have already can't 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→ASP+;PHP3→PHP4.
In the JSP norm book,did not request the procedure in the JSP code part( be
called the Scriptlet)and must write with the Java definitely.Actually,have some
engines of ISP are adoptive other script languageses,such as the EMAC-Script,
WebLetc.,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 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 part not to use the Java,edit and translate of
performance code also should is related with Java.
C.JSP mechanism
To 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"first.
The SSJS and ASPses are all in several year agos 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 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 applies 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 change 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
mature,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 script and the HTML contentses
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 look for the better method of build up the
Web application procedure,the module spreads in customer's machine/ server the
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