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JSP and JSTL Tutorials - Tutorial Addendum - JSTL - Amount Library

 (Continued from antecedent part...)c:forEach Action <c:forEach var="name" items="expression" begin="expression" end="expression" step="expression"> body</c:forEach>If the "items" aspect is specified, it will be acclimated to analyze an arrangement or collection object, the elements in the arrangement or accumulating will be iterated. At anniversary iteration, the accepted aspect will accredit to a called capricious specifiedin the "var" attribute, and physique will be processed. If the "begin", "end" or "step" attribute is specified, it will be acclimated to bind the alpha element, the catastrophe element, or the move admeasurement of the iteration.If the "items" aspect is not specified, an basis accumulation will be acclimated to iterate from the "begin" amount to the "end" amount dispatch with the "step" value.The c:forEach activity serves agnate purposes as the Java for statement. But thereis no breach mechanism.c:forTokens Action <c:forTokens var="name" items="expression" ... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSTL - Amount Library

 JSTL Amount LibraryJSTL amount library can be alien to a JSP page with: <jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:c="http://java.sun.com/jstl/core" version="1.2"> It provides the afterward basal scripting functions: <c:out value="..."/><c:set var="..." value="..."/><c:if test="...">body</c:if><c:choose>body</c:choose><c:forEach items="...">body</c:forEach><c:forTokens items="..." delims="...">body</c:forTokens>c:out Action <c:out value="text_mixed_with_expressions"/>The "value" aspect will be evaluated and the consistent amount will be converted into a cord which will be amid into the HTTP response.The c:out activity serves agnate purposes as the JSP announcement element.c:set Action <c:set var="name" value="expression"/>The "var" aspect specifies a capricious name, which will be declaredand assigned with the amount resulted from the "value" attribute.The c:set activity serves agnate purposes as the Java appointment statement.c:if A... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Accepted Tag Libraries (JSTL)

 (Continued from antecedent part...)Now let s see the Servlet chic generated by Bobcat server based on my JSP page with the "c:out" tag. The Servlet chic is amid at localjakarta-tomcat-4.1.18workstandalonelocalhost\_hello_jstl_jsp.java: package org.apache.jsp;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.*;import org.apache.jasper.runtime.*;public chic hello_jstl_jsp extends HttpJspBase { clandestine changeless java.util.Vector _jspx_includes; clandestine org.apache.jasper.runtime.TagHandlerPool _jspx_tagPool_c_out_value; accessible hello_jstl_jsp() { _jspx_tagPool_c_out_value = new org.apache.jasper.runtime.TagHandlerPool(); } accessible java.util.List getIncludes() { acknowledgment _jspx_includes; } accessible abandoned _jspDestroy() { _jspx_tagPool_c_out_value.release(); } accessible abandoned _jspService(HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, ServletException { JspFactory _jspxFactory = null; javax.servlet.... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Accepted Tag Libraries (JSTL)

 What is JSTL?JSTL (JSP Accepted Tag Libraries) is a accumulating of JSP custom tags developed by Java Association Process, www.jcp.org. The advertence accomplishing is developed by the Jakarta project, jakarta.apache.org.The latest adaptation of JSTL is JSTL 1.1,which requires a JSP alembic that supports the Java Servlet 2.4 and JavaServer Pages 2.0 specifications. Jakarta Bobcat 5 supports these specifications. The antecedent adaptation is JSTL 1.0, which requires a JSP alembic that supports the Java Servlet 2.3 and JavaServer Pages 1.2 specifications. Jakarta Bobcat 4 supports these specifications. Since I accept Bobcat 4.1.18 installed on my machine, I will allocution about JSTL 1.0 alone in this section. The ambition of JSTL, as declared in the specification, is to advice abridge JavaServer Pagespage authors lives. To accomplish this goal, JSTL has provided custom tags for some commonJSP page assembly tasks that crave scripting statements to dispense server sidedynamic data. JSTL o... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JavaServer Pages (JSP)

 (Continued from antecedent part...)You will aswell see a Java chic file: hello_jsp.class. What happened actuality was that Tomcat, the JSP Web server, has translated hello.jsp into hello_jsp.java, and compiled it to hello_jsp.class.The Java file, hello_jsp.java, shows that:hello_jsp is a sub chic of org.apache.jasper.runtime.HttpJspBase, which is a sub chic of javax.servlet.http.HttpServlet.The important adjustment in hello_jsp is _jspService() with two altar listed as parameters: one represents the Servlet request, and the additional represents the Servlet response.The changeless agreeable of hello.jsp is translated into out.write() statements.The anchored Java account in hello.jsp is affected directly.Writing JSP Servlet Chic DirectlyNow we understand that a JSP page is served by the JSP Web server by active the JSP ServletJava chic translated from the JSP page. This agency that we can address a JSP ServletJava chic directly, and ask the JSP Web server to serve it. To try this idea, ... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JavaServer Pages (JSP)

 What is JSP?JSP is a technology, not a language. It allows Web page authors to put activating datainto a Web certificate with Java statements anchored in appropriate HTML tags. The anchored Javastatements will be accomplished by the JSP enabled Web server, not by the Web browser.JSP Page is a Web page, HTML document, with enbedded Java statements in a anatomy authentic by theJSP specification. Actuality is a JSP page example, hello.jsp: <html><body><% out.println("Hello world!"); %></body></html>Line 1 and 3 are accustomed HTML tags. But band 2 is a Java account anchored in appropriate HTML tag.We understand how a accustomed Web page is served by a accustomed Web server:Step 1: The Web browser sends a HTTP appeal to the Web server with the aisle name ofthe Web page.Step 2: The Web server picks up the Web page by afterward the defined aisle name.Step 3: The Web server puts the agreeable of the Web page after any changes into a HTTP response.Step 4: The Web server sends th... Read More by user
Tags: pages, world, server, class, browser, write, notes, public, tutorial, tutorials, normal, response

JSP and JSTL Tutorials - Tutorial Addendum - Book Upload

 (Continued from antecedent part...)On UploadForm page, I called the aforementioned files: File Upload Form:Your email: [_yang@yahoo.com ] Your comments: [I am uploading two files: ] [ hello.txt ] [ dot.gif ]File 1: [C:hello.txt ] Browse...File 2: [C:dot.gif ] Browse...SubmitAfter beat the abide button, I got the afterward aftereffect on the abiding page: -----------------------------7d59ec3031adisposition: null: Content-Disposition: form-data; name="email"blank: null: data: null: _yang@yahoo.comboundary: null: -----------------------------7d59ec3031adisposition: null: Content-Disposition: form-data; name="comment"blank: null: data: null: I am uploading two files:data: null: hello.txtdata: null: dot.gifboundary: null: -----------------------------7d59ec3031adisposition: hello.txt: Content-Disposition: form-data; name="file...type: hello.txt: Content-Type: text/plainblank: hello.txt: boundary: null: -----------------------------7d59ec3031adisposition: dot.gif: Content-Disposition: form-d... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Book Upload

 (Continued from antecedent part...)UploadSave.jsp - Extenuative Uploaded FilesAs you can see from the antecedent section, auctioning uploaded files aback to the browser is easy. But extenuative uploaded files on the server apparatus accurately is not so easy. I wrote the afterward JSP program, UploadSave.jsp, that scans the HTTP appeal physique and saves uploaded files if there are any: <?xml version="1.0"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2"><!-- - UploadSave.jsp - Absorb (c) 2004 by Dr. Yang. All rights reserved.--><jsp:directive.page contentType="text/html"/><jsp:directive.page import="java.io.*"/><html><body><p><jsp:scriptlet><!]></jsp:scriptlet></p></body></html></jsp:root>I again my antecedent upload analysis with UploadSave.jsp by using the UploadInit.htmlpage: File Upload Analysis Settings:File upload handler: Submit method: Encryption type: Submit(Continued on next part...)... Read More by user
Tags: files, content, upload, notes, string, false, tutorial, tutorials, equals

JSP and JSTL Tutorials - Tutorial Addendum - Book Upload

 (Continued from antecedent part...)Of course, I aswell wrote the UploadForm.jsp to present the book upload anatomy page basedthe settings: <?xml version="1.0"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2"><!-- UploadForm.jsp Absorb (c) 2004 by Dr. Yang--><jsp:directive.page contentType="text/html"/><jsp:declaration><!></jsp:scriptlet><jsp:scriptlet><!></jsp:scriptlet></jsp:root>To these programs, first I affected them to the Bobcat 5.5.4 server on my bounded machine. Then I run the Internet Explorer 6.0 (IE) with http://localhost:8080/UploadInit.html. I got the anatomy for alteration book upload settings: File Upload Analysis Settings:File upload handler: Submit method: Encryption type: SubmitWithout alteration any ethics in the form, I clicked the abide button. I got thefile upload form: File Upload Form:Your email: Your comments: File 1: Browse...File 2: Browse...SubmitObserve that:IE displays a "Browse..." button as allotmen... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Book Upload

 (Continued from antecedent part...)Here is sample HTML page to appearance you how to use Book ascribe acreage and "multipart/form-data" encryption type: <?xml version="1.0"?><html><body><!-- UploadSample.html Absorb (c) 2004 by Dr. Yang--><form action="some_url" enctype="multipart/form-data" method="post"><input type="text" name="author" value=" Yang"/><input type="file" name="picture" value="C:dot.gif"/><input type="submit" name="submit" value="Submit"/></form></body></html>The browser should abide the afterward multiple-part HTTP appeal physique if usersclick the abide button: --boundary_identification_stringContent-Disposition: form-data; name="author" Yang--boundary_identification_stringContent-Disposition: form-data; name="picture"; filename="C:dot.gif"Content-Type: image/gifdot.gif_file_content--boundary_identification_stringContent-Disposition: form-data; name="submit"Submit--boundary_identification_string--UploadDump.jsp - Auctioning Uploaded Fi... Read More by user
Tags: action, program, files, server, handle, browser, value, method, upload, option, notes, identification, tutorial, tutorials, encryption

JSP and JSTL Tutorials - Tutorial Addendum - Book Upload

 This affiliate shows you:What are the requirements to upload files to Web servers.The RFC 1867 addendum of HTML for uploading files.How to address a HTML page to upload files, and dump them aback to the browser. How to apprehend uploaded files out of the HTTP request, and save them on the Web server.Requirements for Book UploadTo set up a Web page for users to upload files, you charge to:Understand how book upload works - apprehend the book upload specification.A Web page with appropriate HTML tags to acquaint the browser to cover a filein the HTTP request.A Web server abettor program to handle the HTTP appeal that contains the uploaded file.RFC 1867 - Form-based Book Upload in HTMLIn adjustment to upload files to Web servers, RFC 1867 - Form-based Book Upload in HTMLwas proposed by E. Nebel and L. Masinter in 1995. It offers: 1. A new blazon code, FILE, for the Ascribe HTML tag: <INPUT TYPE="FILE" NAME="field_name" VALUE="file_name">A Web browser should adapt this tag as an ascribe... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Elements

 (Continued from antecedent part...)It s actual absorbing to see the Servlet chic translated from CurrentTime.jsp: package org.apache.jsp;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.*;import org.apache.jasper.runtime.*;import java.util.*;import java.text.*;public chic CurrentTime_jsp extends HttpJspBase { clandestine Date now; clandestine JspWriter out; clandestine abandoned printTime(String tz) throws Throwable { DateFormat df = DateFormat.getInstance(); df.setTimeZone(TimeZone.getTimeZone(tz)); out.println(tz+": "+df.format(now)+"<br/>"); } clandestine changeless java.util.Vector _jspx_includes; changeless { _jspx_includes = new java.util.Vector(1); _jspx_includes.add("/jsp/JvmStamp.jsp"); } accessible java.util.List getIncludes() { acknowledgment _jspx_includes; } accessible abandoned _jspService(HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, ServletException { JspFactory _jspxFactory = null; javax.servlet.jsp.... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Elements

 (Continued from antecedent part...)JSP Archetype - "CurrentTime.jsp"The afterward archetype has three JSP files alive calm to appearance you how to use "decalaration" elements, "include" charge elements and "include" activity elements. Actuality is the capital JSP file, CurrentTime.jsp: <?xml version="1.0"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2"><!-- CurrentTime.jsp Absorb (c) 2002 by Dr. Yang--><jsp:directive.page contentType="text/html"/><html><body><jsp:directive.page import="java.util.*"/><jsp:directive.page import="java.text.*"/><jsp:declaration> clandestine Date now; clandestine JspWriter out; clandestine abandoned printTime(String tz) throws Throwable { DateFormat df = DateFormat.getInstance(); df.setTimeZone(TimeZone.getTimeZone(tz)); out.println(tz+": "+df.format(now)+"&lt;br/>"); }</jsp:declaration><p><b>Current time in altered time zones:</b><br/><jsp:scriptlet> this.out = out; now = new Date(); print... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Elements

 (Continued from antecedent part...)What happens actuality is that the server is apparently sending acknowledgment withcontent-type set to text/xml. To fix the problem, we charge to use a directiveelement to set the contect-type aback to text/html. Actuality is the adapted JSPpage, hello_xml_html.jsp: <?xml version="1.0"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2"><!-- hello_xml_html.jsp Absorb (c) 2002 by Dr. Yang--><jsp:directive.page contentType="text/html"/><html><body><jsp:scriptlet>out.println("Hello world!");</jsp:scriptlet></body></html></jsp:root>There is addition problem with the XML architecture of JSP pages. The problem is causedby the XML claim that the absolute book haveto be able-bodied formed. This is a toughrequirement for the anchored Java statements, because of the < abettor andother appropriate operators. So we charge to use the <![CDATA[...]]> to protectthe Java statements. Actuality is an example, Loop... Read More by user
Tags: action, problem, server, statements, commonly, session, notes, tutorial, tells, tutorials

JSP and JSTL Tutorials - Tutorial Addendum - JSP Elements

 Syntactic Elements of a JSP PageThere are two types of data in a JSP page:Template Data: The changeless part, annihilation that will be affected anon to the acknowledgment by the JSP server.JSP Elements: The activating part, annihilation that will be translated and accomplished by the JSP server.There are three types of JSP elements:Directive Element: A JSP aspect that provides all-around advice for the adaptation phase.There are two means to address a charge element: <%@ directive_name attribute=value ... %>Action Element: A JSP aspect that provides advice for the beheading phase. <action_name attribute=value ...>action_body</action_name><action_name attribute=value .../>Scripting Element: A JSP aspect that provides anchored Java statements. There are three types of scripting elements:Declaration Element: A JSP aspect that provides the anchored Java acknowledgment statementsto be amid into the Servlet class. <%! Java decalaration statements %>Scriptlet Element: A JSP as... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Using Accolade

 (Continued from antecedent part...)Here is simple JSP page that set accolade in altered ways, CookieDump.jsp: <?xml version="1.0"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2"><!-- - CookieDump.jsp - Absorb (c) 2005 by Dr. Yang, http://www.yang.com/--><jsp:directive.page contentType="text/html"/><html><body><p><jsp:directive.page import="javax.servlet.http.Cookie"/><jsp:scriptlet><![CDATA[// Ambience a acting cookie out.println("<b>Temporary cookie:</b><br/>"); Cookie c = new Cookie("Language","English"); response.addCookie(c); out.println("Name: "+c.getName()+"<br/>"); out.println("Value: "+c.getValue()+"<br/>"); out.println("Domain: "+c.getDomain()+"<br/>"); out.println("Path: "+c.getPath()+"<br/>"); out.println("MaxAge: "+c.getMaxAge()+"<br/>"); out.println("Version: "+c.getVersion()+"<br/>");// Ambience a persisted cookie out.println("<b>Persisted cookie:</b><br/>"); c = new Cookie("User"," Yang")... Read More by user
Tags: section, value, cookie, domain, defined, notes, setting, tutorial, tutorials, response, cookies

JSP and JSTL Tutorials - Tutorial Addendum - Beheading Ambience

 (Continued from antecedent part...)Output: JSP Page Ambience InformationPre-defined objects:out: org.apache.jasper.runtime.JspWriterImplthis: org.apache.jsp.ContextInfo_jsprequest: org.apache.coyote.tomcat4.CoyoteRequestFacaderesponse: org.apache.coyote.tomcat4.CoyoteResponseFacadesession: org.apache.catalina.session.StandardSessionFacadeapplication: org.apache.catalina.core.ApplicationContextFacadeconfig: org.apache.catalina.core.StandardWrapperFacadepageContext: org.apache.jasper.runtime.PageContextImplInformation about session:= pageContext.getSession();Class Name: org.apache.catalina.session.StandardSessionFacadeSession ID: 35466D59BF54A551BFBABA22B61A66EBCreate Time: Sun Dec 22 13:40:55 EST 2002Last Admission Time: Sun Dec 22 13:40:55 EST 2002Is Affair New: trueInformation about sessionContext:= session.getSessionContext();Class name: org.apache.catalina.session.StandardSessionContextInformation about application:= pageContext.getServletContext();Class Name: org.apache.catalina.co... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Beheading Ambience

 Predefined ObjectsNow we understand that the Java statements anchored in JSP pages will translated into _jspService() adjustment of a appropriate Servlet class. In that method, there are a brace of pre-defined altar accessible for the anchored Java statements:out: The achievement beck to aggregate activating data to be alloyed into the final Web document.this: The instance of the appropriate Servlet class.request: An HttpServletRequest item apery the appeal accustomed fromthe Web browser.response: An HttpServletResponse item apery the acknowledgment to be delivered back to the Web browser.session: An HttpSession item apery the abstraction of bond assorted tripsof requests and acknowledgment into a individual action unit.application: A ServletContext item apery the abstraction of alignment Servletsinto a individual application.config: A ServletConfig object. pageContext: A PageContext object.The afterward JSP page will appearance you added data about those pre-defined objects: <!-- -... Read More by user
Tags: information, application, class, session, defined, notes, string, tutorial, tutorials, special, response, object

 

 

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