Java Server Pagesby Jon Pearce

JSP DocumentsJSP docs are XHTML Documents containing:Fixed-Template Data: FTDHTML ComponentsXML markupJSP Components:

demo.jsp

Demo

FTD FTD FTD ...

JSP Components Scriptlets

JSP FactsThe container compiles a JSP to a servlet the first time it is served.Use JSPs when ratio of FTD to Dynamic Content is highJSPs decouple design from programmingJSP = HTML containing JavaServlet = Java containing HTMLJSPs replace views

JSP Compilation

Scriptlets

Examples of Scripting Componentscounter = 5) { counter = 0; } %>HTML

ALTERNATIVE HTML

Implicit ObjectsApplication ScopeapplicationSession ScopesessionRequest ScoperequestPage Scoperesponse, out, page, pageContext

Example

Hello

Hello John Doe

javax.servlet.jsp

The JSP to Servlet Translationpublic class MyJSP implements HttpJspPage { // ... public void _jspService(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { JspFactory factory = JspFactory.getDefaultFactory(); PageContext pageContext = factory.getPageContext(...); HttpSession session = pageContext.getSession(); JspWriter out = pageContext.getOut(); Object page = this; try { // body of translated JSP goes here ... } catch (Exception e) { out.clear(); pageContext.handlePageException(e); } finally { out.close(); factory.releasePageContext(pageContext); } }}

Examplesclock.jsp

scriptTest.jsp

Pallindrome TesterbeanTest.jsp

various counterspersonView.jsp

Standard Actions ... includeforwardpluginparamuseBeansetPropertygetProperty

Directives

Include Directive

Include Directive vs. Actionfoo.html included after each changefoo.html included once at compile timeStatic (html) or dynamic (jsp) files can be included

forward

useBeanAccessing Bean Properties

Setting Bean Properties

Example

result =

Custom Tag Libraries