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JSP and JSTL Tutorials - Tutorial Addendum - Using JavaBean Classes

 (Continued from antecedent part...)Using Java Altar as JavaBeansNow we understand that a JavaBean is just a accustomed Java item with some distinctively namedmethods, and stored in pageContext s aspect collection. We can use the useBeanto make a JavaBean and use it any way we wanted. The next catechism is: can we make any item and put it into pageContext s attributecollection, and use setProperty and getProperty elements? The acknowledgment is yes. Hereis my sample JSP page to appearance you this: <?xml version="1.0"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2"><!-- ObjectAsBean.jsp Absorb (c) 2003 by Dr. Yang--><html><body><jsp:scriptlet><![CDATA[ .DemoBean b = new .DemoBean(); pageContext.setAttribute("b", b, PageContext.PAGE_SCOPE); b.setAuthor("Unknown"); b.setTotal(9.99);]]></jsp:scriptlet>Line 21: columnist = <jsp:getProperty name="b" property="author"/><br/>Line 22: absolute = <jsp:getProperty name="b" property="total"/>&l... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Using JavaBean Classes

 (Continued from antecedent part...)Note that:Property names are case sensitive. Acreage name "Author" can not be mapped to "getAuthor" method. Two set methods after any one demography Cord as ascribe constant blazon is givingme problem to set "total".Two set methods with one demography Cord as ascribe constant blazon is ok. Achievement line 5 is the prove.Using JavaBeans as Altar in Scripting ElementsAs I mentioned in the antecedent section, JavaBean is just a accustomed Java item withsome appropriate method. Already a JavaBean is created, we should be able to use it asJava item in any scripting elements.Here is a sample page to appearance you how to use a JavaBean as a Java object. It is usingthe aforementioned JavaBean class, .DemoBean, as the antecedent section. <?xml version="1.0"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2"><!-- BeanAsObject.jsp Absorb (c) 2003 by Dr. Yang--><html><body><jsp:useBean id="b"><jsp:setProperty name="b" propert... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Using JavaBean Classes

 (Continued from antecedent part...)In this section, let s attending at some of the basal rules about ambience and gettingJavaBean properties:The setProperty aspect haveto be accurate by at atomic one set adjustment in the JavaBean class. The set adjustment name haveto be the acreage name with the first lower case letterbeing translated to high case, and prefixed with "set". For example, "setAuthor"is a acceptable adjustment name to abutment the setProperty activity aspect for acreage name "author".The acknowledgment blazon of the set adjustment should be void.The set adjustment should yield alone one ascribe parameter.If there are assorted set methods, there haveto be one that takes Cord as the input constant type, and this will be the one to be acclimated by the setProperty actionelement. If there is alone one set method, the ascribe constant blazon should be a primitivetype. The get adjustment name haveto be the acreage name with the first lower case letterbeing translated to high ca... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Using JavaBean Classes

 (Continued from antecedent part...)It s actual absorbing to see the Servlet chic translated from UseBean.jsp: package org.apache.jsp;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.*;import org.apache.jasper.runtime.*;import CacheBean;public chic UseBean_jsp extends HttpJspBase { clandestine changeless java.util.Vector _jspx_includes; 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.PageContext pageContext = null; HttpSession affair = null; ServletContext appliance = null; ServletConfig config = null; JspWriter out = null; Item page = this; JspWriter _jspx_out = null; try { _jspxFactory = JspFactory.getDefaultFactory(); response.setContentType("text/xml;charset=UTF-8"); pageContext = _jspxFactory.getPageContext(this, request, response, null, tru... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Using JavaBean Classes

 This affiliate explains:How to amount a JavaBean into JSP pages and dispense its properties. Compilation issues of using JavaBean classes in bearding packages.Setting and accepting JavaBeans properties.Using JavaBeans as Java altar in scripting elements.Using Java altar as JavaBeans.How to brace the JavaBean altar loaded in memory.The "jsp:useBean" Activity Elementsjsp:useBean: A JSP activity aspect that endless a JavaBean item into the JSP page. <jsp:useBean id="object_name">where "object_name" is the name of the item to be created, and "class_name" is theclass name of the JavaBean chic from which the item will be instantiated.Once a bean item is loaded into the page, you can use two additional activity elements to manipulate it. <jsp:setProperty name="obj" property="prop_name" value="prop_value"/><jsp:getProperty name="obj" property="prop_name"/>The "setProperty" activity will set a new amount to the defined acreage of the specifiedbean object. The "getProperty" activity wil... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Bobcat 4.1.18 with JDK 1.4.1

 (Continued from antecedent part...)You will get the afterward accumulation absurdity adage CacheBean is not resolvable: org.apache.jasper.JasperException: Clumsy to abridge chic for JSPAn absurdity occurred at line: 7 in the jsp file: /jsp/UseBeanModified.jspGenerated servlet error: [javac] Accumulation 1 antecedent fileD:localjakarta-tomcat-4.1.18workStandalonelocalhost \_jspUseBeanModified_jsp.java:43: cannot boldness symbolsymbol : chic CacheBean location: chic org.apache.jsp.UseBeanModified_jsp CacheBean b = null; ^The absolute couldcause of this absurdity is not the compiler. It is the Bobcat accumulation environment.Because you can abridge the adapted class, UseBeanModified_jsp.java, accurately in a command windowwith the aforementioned chic paths acclimated by the Bobcat environment.The alone advantage larboard to use a JavaBean with Bobcat 4.1.18 and JDK 1.4.1 is to make your JavaBean in a called package. The next area will accord you an example.JavaBean in a Called Amalgamatio... Read More by user
Tags: getting, classes, property, package, notes, public, tutorial, tutorials

JSP and JSTL Tutorials - Tutorial Addendum - Bobcat 4.1.18 with JDK 1.4.1

 This affiliate explains:How to change Bobcat 4.1.18 accession from using JDK 1.3.1 to using JDK 1.4.1.Compilation issues of using JavaBean classes in bearding packages.How to make JavaBean classes in called packages.Upgrading Bobcat 4.1.18 to JDK 1.4.1One of the readers appear a JSP accumulation affair while afterward my tutorials with Bobcat 4.1.29 and JDK 1.4.x. In adjustment to accept the affair better, I upgradedmy Bobcat 4.1.18 accession from JDK 1.3.1 to JDK 1.4.1: 1. Arrested my JDK 1.4.1 installation. The afterward command shows that I accept JDK 1.4.1_01working correctly: >localj2sdk1.4.1injava -versionjava adaptation "1.4.1_01"Java(TM) 2 Runtime Environment, Accepted Copy (build 1.4.1_01-b01)Java HotSpot(TM) Applicant VM (build 1.4.1_01-b01, alloyed mode)2. Started Bobcat server with JDK 1.4.1 after any problem: cd localjakarta-tomcat-4.1.18inset JAVA_HOME=localj2sdk1.4.1startup3. Created the afterward JSP page, hello.jsp, and affected to localjakarta-tomcat-4.1.18webappsRO... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - Tags Alive Calm

 (Continued from antecedent part...)I am abiding you can apprehend this page, and accept what I am accomplishing with the loop. Warning, my "break" tag is not a absolutely breach statement. If there is any additionalbody agreeable in the bend tag afterwards the "break" tag, it will not be skipped. Sharing Data with Additional TagsIn the antecedent example, we looked at how tags can be nested central anniversary other, and how adolescent tags can admission ancestor tags to adapt their behavior. In the next example, we will attending at how non-nested tags, brother tags, can communicate to anniversary other.If a tag wants to allotment data with a brother tag, it haveto abundance the data to a commonplace area both of them accept access. Obviously, that accepted abode is the pageContextobject.The JSP tag addendum ability offers to every tag item the admission to pageContextobject by the setPageContext() alarm in Tag interface. If you use the TagSupport implementation class, pageContext is ... Read More by user
Tags: access, example, numbers, class, content, store, together, value, prime, attribute, notes, public, tutorial, tutorials, retrieve, working, object

JSP and JSTL Tutorials - Tutorial Addendum - Tags Alive Calm

 Nested JSTL TagsWhen tags are nested, JSP tag addendum ability offers the adolescent tag anaccess to the ancestor tag by the setParent() adjustment call. You can yield advantageof this admission to architecture nested tags to plan calm to accomplish added complexfunctions.As an example, I wrote two simple tags to accomplish a bend action with the ability to breach out the bend conditionally. Here is my bend tag, LoopTag.java: /** * LoopTag.java * Absorb (c) 2003 by Dr. Yang. All rights reserved. */package ;import java.io.*;import javax.servlet.jsp.tagext.*;public chic LoopTag extends TagSupport { accessible boolean stop = false; accessible int doStartTag() { acknowledgment EVAL_BODY_INCLUDE; } accessible int doAfterBody() { if (!stop) acknowledgment EVAL_BODY_AGAIN; abroad acknowledgment SKIP_BODY; }}The argumentation of the "loop" tag is actual simple. It evaluates its physique anon already the tag is encountered. At the end of the evaluation, it checks its "stop" condition,if "stop" ... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Tag Java Interface

 (Continued from antecedent part...)The Servlet Chic - TraceTagTest_jsp.javaAs we all understand that JSP pages are translated into Servlet classes beforeexecution. So we infact analysis the construe Servlet chic to see how thetag addendum ability connects the Servlet chic to the tag class. To analysis the Servlet chic translated from TraceTagTest.jsp, accessible TraceTagTest_jsp.javain localjakarta-tomcat-4.1.18workstandalonelocalhost\_, you will see: package org.apache.jsp;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.*;import org.apache.jasper.runtime.*;public chic TraceTagTest_jsp extends HttpJspBase { clandestine changeless java.util.Vector _jspx_includes; clandestine org.apache.jasper.runtime.TagHandlerPool _jspx_tagPool_hy_trace_myAtt; accessible TraceTagTest_jsp() { _jspx_tagPool_hy_trace_myAtt = new org.apache.jasper.runtime.TagHandlerPool(); } accessible java.util.List getIncludes() { acknowledgment _jspx_includes; } accessible abandoned _jspDestr... Read More by user
Tags: class, write, method, interface, notes, public, trace, tutorial, tutorials, response, object

JSP and JSTL Tutorials - Tutorial Addendum - JSP Tag Java Interface

 (Continued from antecedent part...)Implenting BodyTag Interface - TraceTag.javaIn adjustment to affirm my compassionate of the IterationTag interface, I wrotethe afterward tag chic to book a abbreviate bulletin from anniversary implemented methodto appearance if it is called. I aswell acclimated a actual simple argumentation in doAfterTag()to force the tag physique getting evaluated twice. /** * TraceTag.java * Absorb (c) 2003 by Dr. Yang. All rights reserved. */package ;import java.io.*;import javax.servlet.jsp.*;import javax.servlet.jsp.tagext.*;public chic TraceTag accouterments IterationTag { clandestine boolean stop = false; clandestine PageContext pc = null; clandestine Tag t = null; accessible abandoned setPageContext(PageContext pc) { this.pc = pc; println("setPageContext() called."); } accessible abandoned setParent(Tag t) { this.t = t; println("setParent() called."); } accessible Tag getParent() { println("setParent() called."); acknowledgment t; } accessible abandoned setMyA... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Tag Java Interface

 javax.servlet.jsp.tagext.* Packagejavax.servlet.jsp.tagext.* is a Java amalgamation authentic in J2EE (I saw it in J2EE 1.3.1). This amalgamation contains: Tag interface - The abject interface appropriate by a tag chic to collaborate with the JSP tag addendum facility.IterationTag interface - Continued from Tag interface to abutment looping logic aural custom tags.BodyTag interface - Continued from IterationTag interface to acquiesce custom tags to appraise their own body.TagSupport class - Copy accomplishing of IterationTag interface.BodyTagSupport class - Copy accomplishing of BodyTag interface.BodyTag InterfaceSince BodyTag interface requires added ability of JSP in adjustment to evaluatethe tag physique properly, we will altercate it later. For now, let s apply on InterationTag interface only. Actuality is the account of methods appropriate by InterationTag interface and their calling conditions:setPageContext(PageContext pc) - A advice method, alleged afore calling doStartTag() to... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Tag Aspect Administration

 (Continued from antecedent part...)Tag Aspect Amount Announcement Archetype - AttObjectTag.javaThe tag class: /** * AttObjectTag.java * Absorb (c) 2003 by Dr. Yang. All rights reserved. */package ;import java.util.*;import java.io.*;import javax.servlet.jsp.*;import javax.servlet.jsp.tagext.*;import org.apache.taglibs.standard.lang.support.*;public chic AttObjectTag extends TagSupport { clandestine Cord booleanAtt = null; clandestine Boolean booleanObject = null; clandestine Cord stringAtt = null; clandestine Cord stringObject = null; clandestine Cord mapAtt = null; clandestine Map mapObject = null; accessible abandoned setBooleanAtt(String att) { booleanAtt = att; try { booleanObject = (Boolean) ExpressionEvaluatorManager.evaluate( "booleanAtt", booleanAtt, java.lang.Boolean.class, this, pageContext); } bolt (JspException e) { System.err.println(e.toString()); } } accessible abandoned setStringAtt(String att) { stringAtt = att; try { stringObject = (String) ExpressionEvaluatorManager.... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Tag Aspect Administration

 (Continued from antecedent part...)The JSP file: <?xml version="1.0"?><jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:c="http://java.sun.com/jstl/core" xmlns:hy="urn:jsptld:/WEB-INF/tlds/HyTaglib.tld" version="1.2"> <!-- AttValueTagTest.jsp Absorb (c) 2003 by Dr. Yang--><jsp:directive.page contentType="text/html"/><html><body><hy:attValue longObject="1" longValue="2" doubleObject="1.1" doubleValue="2.2" booleanObject="true" booleanValue="false" stringObject="Hello world!"/></body></html></jsp:root>The output: longValue = 2longObject = 1doubleValue = 2.2doubleObject = 1.1booleanValue = falsebooleanObject = truestringObject = Accost worldThe Servlet chic produced by Bobcat server: ... clandestine boolean _jspx_meth_hy_attValue_0( javax.servlet.jsp.PageContext pageContext) throws Throwable { JspWriter out = pageContext.getOut(); /* ---- hy:attValue ---- */ .AttValueTag _jspx_th_hy_attValue_0 = (.AttValueTag) _jspx_tagPool_hy_attValue_stringObject_lon... Read More by user
Tags: types, class, custom, value, method, attribute, format, values, notes, false, tutorial, tutorials

JSP and JSTL Tutorials - Tutorial Addendum - JSP Tag Aspect Administration

 (Continued from antecedent part...)Tag Aspect Amount Blazon ConversionIn my antecedent example, the aspect amount is anesthetized to the tag item propertyas a cord data type. Can we canyon aspect ethics to tag item as additional data typesor objects? The acknowledgment is yes. JSP tag addendum ability will try to catechumen attributevalues to the data types of the tag item properties. I couldn t acquisition any official specifications on the bout rules. The afterward is my guesses:Match the aspect name to the setter adjustment of a acreage with the aforementioned name in the tag object. If the data blazon of the ascribe constant of the setter adjustment is a archaic data type, like "long",give the aspect amount as accurate data to the ascribe parameter.If the data blazon of the ascribe constant of the setter adjustment is the adhesive chic of a archaic data type, like "Long", instantiate an item of that chic with the aspect amount as a Cord ascribe to the constructor, and accord the ne... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Tag Aspect Administration

 Tag Aspect Setter MethodThe JSP tag addendum ability maps anniversary aspect encountered in a customtag to an acreage of the aforementioned name of the tag object. So if you wish to use an aspect in a custom tag, you haveto ascertain a acreage in the tag classwith the aforementioned name as the attribute. Actuality is the accomplish you charge to followto add an aspect to a custom tag:1. Ascertain a acreage in the tag chic with the aforementioned name as the aspect name by abacus a setter adjustment and a getter method. This is the aforementioned way as defininga acreage in a JavaBean class.2. Add an "attribute" aspect central the "tag" aspect in your TLD book with the afterward syntax: <tag> <name>tag_name</name> <tag-class>class_full_name</tag-class> <body-content>empty | jsp</body-content> <attribute> <name>attribute_name</name> <required>true | false</required> </attribute></tag>3. Add the aspect to the custom tag in your JSP page. Then the... Read More by user
Tags: class, content, custom, property, method, attribute, message, notes, public, tutorial, tutorials, object

JSP and JSTL Tutorials - Tutorial Addendum - JSP Custom Tag

 (Continued from antecedent part...)3. Autograph the tag library descriptor (tld) file. Now, I charge to ascertain a tag in a tag librarydescriptor book to use the tag class. Actuality is my first tld file, HyTaglib.tld: <?xml version="1.0"?><!DOCTYPE taglib Accessible "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_2.dtd"> <!-- HyTaglib.tld Absorb (c) 2003 by Dr. Yang--><taglib><tlib-version>1</tlib-version><jsp-version>1.2</jsp-version> <short-name> s Tag Library</short-name> <tag> <name>hello</name> <tag-class>HelloTag</tag-class> <body-content>empty</body-content></tag></taglib>4. Installing the tld file. Tag library descriptor files charge to be attainable by the bobcat server. So I affected HyTaglib.tld to localjakarta-tomcat-4.1.18webapps ootweb-inf lds directory.5. Autograph the JSP page. To use my first custom tag, I wrote the afterward JSP page, hello_tag.jsp: &... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Custom Tag

 What is a Custom Tag?Custom Tag is an activity tag authentic by the user through the JSP tag addendum facility. It can be acclimated to move JSP page assembly logics and advice into a tag Java class, and invokeit by an activity tag that is affiliated to that class. There are two capital advantages of using custom tags:Repeatable JSP page logics and advice can be simplified and centralized into a individual tag. For example, we can ascertain a custom tag alleged <my:copyright/> for bearing the absorb advice that charge to be acclimated on every page of server.Moving circuitous business logics from the JSP to a tag class, so the JSP page author can apply on the presentation logics only. For example, we can ascertain a custom tag alleged <my:userList/> for bearing a HTML table abounding with a account of users.The tag chic will administer how the put anniversary user into a row, and anniversary user acreage into a column.I am abiding that the functionalities provided by custom tags ... Read More by user
Tags: information, world, example, server, class, custom, called, provided, notes, tutorial, tutorials

JSP and JSTL Tutorials - Tutorial Addendum - JSP Sessions and Debugging

 (Continued from antecedent part...)Here is my sample Perl program, reg_client.pl, advised to plan with my antecedent JSP allotment application: #- reg_client.pl#- Absorb (c) 2002 by Dr. Yang use LWP::Debug qw(+); use LWP::UserAgent; use HTTP::Cookies; ($url) = @ARGV; $url = http://localhost unless $url; $ua = new LWP::UserAgent; $cookie_jar = HTTP::Cookies->new; &getForm(); &submitForm(); exit;sub getForm { $u = $url. /RegForm.jsp ; my $req = new HTTP::Request GET => $u; my $res = $ua->request($req); $req = $res->request(); $cookie_jar->extract_cookies($res); &dump($req,$res);}sub submitForm { $u = $url. /RegForm.jsp?name=Mike&pass=None&color=Blue&submit=Submit ; my $req = new HTTP::Request GET => $u; $cookie_jar->add_cookie_header($req); my $res = $ua->request($req); $req = $res->request(); $cookie_jar->extract_cookies($res); &dump($req,$res);}sub dump { bounded ($req,$res) = @_; book " REQUEST-HEADERS "; book $req->headers_as_string(); book " REQUEST-CONTE... Read More by user

JSP and JSTL Tutorials - Tutorial Addendum - JSP Sessions and Debugging

 (Continued from antecedent part...)SessionPage2.php: <?php # SessionPage2.php# Absorb (c) 2002 by Dr. Yang# session_start(); $quantity = $_SESSION; $price = 9.99; $_SESSION = $price; $count = $_SESSION; $count++; $_SESSION = $count;# book "<pre> "; book " I am affairs $quantity PHP books. "; book "The assemblage amount is $price per book. ";# book " <a href=SessionPage3.php>Next</a> "; book " <a href=SessionPage1.php>Prev</a> "; book " Counter = $count "; book "Session name = ".session_name()." "; book "Session id = ".session_id()." ";# book " Contents of $_GET: "; foreach ($_GET as $k => $v) { book " $k = $v "; }# book " Contents of $_POST: "; foreach ($_POST as $k => $v) { book " $k = $v "; }# book " Contents of $_COOKIE: "; foreach ($_COOKIE as $k => $v) { book " $k = $v "; } book "</pre> ";?>SessionPage3.php: <?php # SessionPage3.php# Absorb (c) 2002 by Dr. Yang# session_start(); $quantity = $_SESSION; $price = $_SESSION; $total = $quantity * $price; $count ... Read More by user

 

 

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