【導(dǎo)讀】因而，從根本上，JSP頁(yè)面能夠執(zhí)。行的任何任務(wù)都可以用servler來(lái)完成。然而，這種底層的等同性并不。意味著servler和JSP頁(yè)面對(duì)于所有的情況都等同適用。術(shù)的能力，而是二者在便利性、生產(chǎn)率和可維護(hù)性上的不同。成，但是選擇哪種語(yǔ)言依舊十分重要。JSP中HTML的編寫與維護(hù)更為簡(jiǎn)單。沒(méi)有額外的反斜杠，沒(méi)有額外的雙引號(hào)，也沒(méi)有暗含的Java語(yǔ)法。開(kāi)發(fā)人員可以將經(jīng)理集中在表示層上。型的項(xiàng)目，這種劃分極為重要。依據(jù)開(kāi)發(fā)團(tuán)隊(duì)的大小，及項(xiàng)目的復(fù)雜程。六、在此，這個(gè)討論并不是讓您停止使用servlets，只使用JSP。所有的項(xiàng)目都會(huì)同時(shí)用到這兩種技術(shù)。針對(duì)項(xiàng)目中的某些請(qǐng)求，您可能。會(huì)在MVC構(gòu)架下組合使用這兩項(xiàng)技術(shù)。.NET是Microsoft精心設(shè)計(jì)的一項(xiàng)技術(shù)。JSP的優(yōu)勢(shì)體現(xiàn)在兩個(gè)方面。相對(duì)于這個(gè)版本,JSP. JSP的一項(xiàng)優(yōu)勢(shì)是動(dòng)態(tài)部分用Java編寫，而Java已經(jīng)在聯(lián)網(wǎng)、原則上，JSP并沒(méi)有提供Servlet不能完成的功能。另外，通過(guò)將表示與內(nèi)容分離，HTML頁(yè)面一樣，JSP頁(yè)面依舊可以包括用于JavaScript的SCRIPT標(biāo)簽。

　　

【正文】 e, but not for nonstandard resources. Web application security settings are the same. In addition, the industry39。s JSP and Servlet technology, the tremendous support of these two technologies have made tremendous progress, thereby reducing many of the criticisms of the JSP. For example, JSP Standard Tag Library, and JSP expression language to solve the two of the most widespread criticism: the lack of good iterative structure。 do not use explicit Java code or a lengthy jsp: useBean element difficult to access the dynamic results. Third, the misunderstanding of the JSP Forget JSP technology is a serverside technology Here are some typical problems Marty received (most of the issues appear more than once). ? Our servers are running . How do I use the Swing ponents JSP pages as well? How do I put an image in JSP pages? I do not know what to read image file should use Java ? I / O mands. Tomcat does not support JavaScript, when the user moves the mouse over the image, how can I make the image highlight it? ? ? Our customers do not understand the JSP to use the old browser. How should I do? When our client in the browser using the View ? Source (view source code), how to stop them see the JSP Tag? All of these issues are based on the browser to the serverside process in an informed assumption. But in fact the browser does not understand the serverside process. Therefore: ? If you want to use Swing ponents applet into the page, it is important that the Java version of the browser and the Java version of the server has nothing to do. If the browser supports Java 2 platform, you can use the normal APPLET (or the Java plugin) label, even if the server using a nonJava technologies should also be the case. You do not need Java ? I / O to read the image file, you only need to store images on Web directory of resources (ie, up 2 WEBINF/classes directory), and outputs a normal IMG tag. ? You should use the SCRIPT tag, use the clientside JavaScript to create under the mouse will change the image, this does not change because the server using JSP. ? browser does not support JSP they only see the JSP page output. Thus, as with static HTML pages, like, just ensure that the JSP output of HTML and browser patibility. ? Of course, you do not need to take measures to prevent customers see JSP label, the labels on the server for processing, sent to the customer39。s output did not arise. Confusion during the conversion period and the request JSP pages need to convert into a servlet. In the piled Servlet, load content to the server, initialize and execute. But every step of what happened when? To answer this question, we must remember the following two points: ? JSP page is only in the revised first time visit, will be converted into a servlet and pile。 ? loaded into memory, initialization and implementation of the servlet to follow the general rules. Table 1 lists some mon situations, about the kinds of circumstances has occurred at each step. The most monly misunderstood items marked have been highlighted. In reference to the table, we should note that the servlet generated by the JSP page using _jspService methods (GET and POST requests are calling the function), is not a doGet or doPost method. Similarly, for initialization, they use jspInit method, rather than the init method. Table 1 of the JSP operate a variety of situations JSP pages into servlet will pile Servlet to Servlet loaded into server memory to call jspInit call _jspService Page first created Request a Yes Yes Yes Yes Yes 2 No No No No requests have After the server restart Request 3 No No Yes Yes Yes 4 No No No No requests have Page modified Request 5 Yes Yes Yes Yes Yes 6 No No No No requests have