【正文】 而且對于 CGI 來說，每一個(gè)訪問就需要新增加一個(gè)進(jìn)程來處理，進(jìn)程不斷地建立和銷毀對于作為 Web 服務(wù)器的計(jì)算機(jī)將是不小的負(fù)擔(dān)。 JSP 引擎實(shí)際上要把 JSP 標(biāo)簽、 JSP 頁中的 Java 代碼甚至連同靜態(tài) HTML 內(nèi)容都轉(zhuǎn)換為大塊的 Java 代碼。由于 JSP 的以組件為中心的性質(zhì)，它可以被 Java 和非 Java 開發(fā)者同樣使用。其事實(shí)上，企業(yè)中可重用組件的應(yīng)用早已經(jīng)很成熟，沒有人愿意為它們的應(yīng)用程序重寫那些邏輯。實(shí)際上，有一些 JSP 引擎就是采用的其他腳本語言，如 EMACScript、 WebL等，但實(shí)際上這幾種腳本語言也是構(gòu)建在 Java 上面，編譯為 Servlet 來實(shí)現(xiàn)的。然而，作為一種腳本語言， JSP 又顯得過于強(qiáng)大了，在 JSP 中幾乎可以使用全部的 Java 類。 Java 團(tuán)隊(duì)并 沒有發(fā)明這一思想 將頁面設(shè)計(jì)成由靜態(tài) HTML 和用特殊標(biāo)簽標(biāo)記的動(dòng)態(tài)代碼混合組成 .。 但 Java Servlet也不是沒有缺點(diǎn)，和傳統(tǒng)的 CGI、 ISAPI、 NSAPI 方式相同， Java Servlet是利用輸出 HTML 語句來實(shí)現(xiàn)動(dòng)態(tài)網(wǎng)頁的，如果用 Java Servlet 來開發(fā)整個(gè)網(wǎng)站，動(dòng)態(tài)部分和靜態(tài)頁面的整合過程會(huì)非常難以實(shí)現(xiàn)。我們總是希望用適當(dāng)?shù)墓ぞ咄瓿上鄬?yīng)的工作，僅僅是 servlet 并不 一定能夠勝任所有工作 。 可以對開發(fā)團(tuán)隊(duì)進(jìn)行劃分。因而，從根本上， JSP 頁面能夠執(zhí)行的任何任務(wù)都可以用 servlet 來完成。 JSP 為創(chuàng)建高度動(dòng)態(tài)的 Web 應(yīng)用提供了一個(gè)獨(dú)特的開發(fā)環(huán)境。s 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 pany would take technology from other panies and suborn it for their own purposes. But guess what? The shoe is on the other foot here. The Java munity did not invent the idea of designing pages as a mixture of static HTML and dynamic code marked with special tags. For example, Cold Fusion did it years earlier. Even ASP (a product from the very software pany of the aforementioned manager) popularized this approach before JSP came along and decided to jump on 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 bee more like the SSJS, it also allows 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( such as JavaScript and VBScript), the norm of JSP also allows to use other languages. 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 4 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 bine 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 pletes 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 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 the dynamic state web page development tool of the type, such as ASP, PHP3 etc., because speed etc. reason, have already can39。t satisfy current the large electronic merce needs appliedly, traditional development techniques are all at to edit and translate the executive way change, such as the ASP → ASP+。按照 Sun的說法， JSP 能夠適應(yīng)市場上包括 Apache WebServer、 在內(nèi)的 85%的服務(wù)器產(chǎn)品。然而，這種底層的等同性并不意味著 servlet 和 JSP 頁面對于所有的情況都等同適用。 Java 程序員可以致 力于動(dòng)態(tài)代碼。 JSP 的由來 Sun 公司的 JSP 技術(shù)，使 Web 頁面開發(fā)人員可以使用 HTML 或者 XML 標(biāo)識(shí)來設(shè)計(jì)和格式化最終頁面。為了解 決 Java Servlet 的這種缺點(diǎn)， SUN 推出了 JSP。 ColdFusion 多年前就已經(jīng)這樣做了。 作為一種基于文本的、以顯示為中心的開發(fā)技術(shù)， JSP 提供了 Java Servlet 的所有好處，并且， 當(dāng)與一個(gè) JavaBeans 類結(jié)合在一起時(shí)， JSP 提供了一種使內(nèi)容和顯示邏輯分開的簡單方式。按照 JSP規(guī)范書寫，和 Java 沒有任何關(guān)系的 Scriptlet 也是可以的，不過，由于 JSP 的強(qiáng)大功能主要在于能和 JavaBeans、 Enterprise JavaBeans 共同運(yùn)轉(zhuǎn)，所以即使是 Scriptlet 部分不使用Java，編譯成的執(zhí)行 代碼也應(yīng)該是與 Java 相關(guān)的。 HTML 和圖形設(shè)計(jì)師把它們的設(shè)計(jì)的實(shí)施工作交給了 Web 編寫者，使他們不得不加倍工作 —— 常常是手工編寫，因?yàn)闆]有合適的工具可以把服務(wù)器端腳本與 HTML 內(nèi)容結(jié)合起來。非 Java 開發(fā)者可以通過 JSP 的標(biāo)簽 (Tags)來使用高級(jí) Java 開發(fā)者創(chuàng)建的 JavaBeans。這些代碼塊被 JSP 引擎組織到用戶看不到的 Java Servlet