By Hans Bergsten
JavaServer Pages (JSP) is harmonizing how net designers and programmers create dynamic internet pages. the cause of this is often easy: JSP capitalizes at the energy of Java servlets to create potent, reusable internet applications.JSP helps you to advance powerful, robust web pages, and the easiest half is that you are not required to be a hard-core Java programmer.JavaServer Pages Pocket Reference is the correct better half quantity to O'Reilly's best-selling JavaServer Pages, additionally by way of Hans Bergsten. This booklet presents exact assurance of JSP syntax and processing, directive components, ordinary motion components, scripting components, implicit gadgets, customized activities, tag library description construction, and WARs.
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Extra resources for JavaServer Pages Pocket Reference
9600 web page 2 Friday, September 7, 2001 2:51 PM <%@ web page language="java" contentType="text/html" percent> JSP aspecttemplate textual content
- User identify: template textual content
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template textual content JSP point template textual content determine 1. Template textual content and JSP components JSP Processing ahead of a JSP web page is distributed to a browser, the server needs to approach the entire JSP parts it comprises. This processing is played by means of an internet box, which might be both a local a part of an online server or a separate product hooked up to the net server. the internet box turns the JSP web page right into a Java servlet, then executes the servlet. changing the JSP web page right into a servlet (known because the JSP web page implementation classification) and compiling the servlet occur within the translation part. the net box initiates the interpretation part for a JSP web page immediately while the 1st request for the web page is bought. the interpretation part takes just a little time, in fact, so clients may possibly detect a moderate hold up the 1st time they request a JSP web page. the interpretation section may also 2 | JavaServer Pages Pocket Reference ,jsppr. 9600 web page three Friday, September 7, 2001 2:51 PM be initiated explicitly, to prevent hitting the 1st person with the hold up. this is often known as precompilation. the net box is usually liable for invoking the JSP web page implementation type to approach each one request and generate responses. this can be known as the request processing section. the 2 levels are illustrated in determine 2. hi. jsp Server with JSP box 2 Translation section d Rea purchaser helloServlet. java 1 three Generate GET /hello. jsp HTTP/1. zero 2 hundred okay 6 assemble Hello! four Exec ute five helloServlet. category Request processing section determine 2. JSP web page translation and processing stages so long as the JSP web page is still unchanged, the interpretation part is skipped. whilst the web page is changed, it is going during the translation section back. Let’s examine an easy instance. within the culture of programming books, we begin with an software that writes “Hello international” (with a twist—it additionally exhibits the present time at the server):
it really is <%= new java. util. Date(). toString() percent> and all is easily. This JSP web page produces the outcome proven in determine three. JSP Processing | three ,jsppr. 9600 web page four Friday, September 7, 2001 2:51 PM determine three. The output from the hi international web page this is often so simple as it will get. The code represented by means of the JSP aspect (which now we have highlighted in daring within the code) is performed, and the result's mixed with the common HTML within the web page. to that end the JSP aspect is a scripting point with Java code for writing the present date and time.