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JSP
What's wrong with my customTag?
Zhang Jones
Greenhorn
Posts: 17
posted 14 years ago
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Hi all!
I can't find any problem in my project, anyone else can help me find out the fault and offer modify ideas?
Movie
package edu.city.foo; import java.util.ArrayList; import java.util.List; public class Movie { private String name; private String genre; public Movie(String name,String genre) { this.name = name; this.genre = genre; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getGenre() { return genre; } public void setGenre(String genre) { this.genre = genre; } public static void main(String[] args) { Movie movie1 = new Movie("7 day","skill"); Movie movie2 = new Movie("night", "skill"); List movies = new ArrayList(); movies.add(movie1); movies.add(movie2); SimpleTagTest simpleTagTest = new SimpleTagTest(); simpleTagTest.setMovieList(movies); } }
SimpleTagTest
package edu.city.foo; import java.io.IOException; import java.util.Iterator; import java.util.List; import javax.servlet.jsp.JspException; import javax.servlet.jsp.tagext.SimpleTagSupport; public class SimpleTagTest extends SimpleTagSupport { private static final long serialVersionUID = 6714301064023583139L; private List movieList; public void setMovieList(List movieList) { this.movieList = movieList; } @Override public void doTag() throws JspException, IOException { Iterator<Movie> iterator = movieList.iterator(); while (iterator.hasNext()) { Movie movies = (Movie) iterator.next(); getJspContext().setAttribute("movie", movies); getJspBody().invoke(null); } } }
simple.tld
<?xml version="1.0" encoding="UTF-8"?> <taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web- jsptaglibrary_2_0.xsd” version=”2.0"> <tlib-version>1.0</tlib-version> <jsp-version>1.2</jsp-version> <uri>simpleTags</uri> <tag> <description>worst use of a custom tag</description> <name>SimpleTagTest</name> <tag-class>edu.city.foo.SimpleTagTest</tag-class> <body-content>scriptless</body-content> <attribute> <name>movieList</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>
useTag.jsp
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <%@ taglib uri="simpleTags" prefix="myTags" %> <%@ page import="edu.city.foo.*" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'useTag.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <table> <myTags:SimpleTagTest movieList="${movie}"> <tr> <td>${movie.name}</td> <td>${movie.genre}</td> </tr> </myTags:SimpleTagTest> </table> </body> </html>
customTag
Christophe Verré
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posted 14 years ago
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Before even looking at anything, what is your problem exactly ? An error displayed somewhere ? Nothing displayed ?
Did you check the HTML source ?
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Zhang Jones
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Posts: 17
posted 14 years ago
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org.apache.jasper.JasperException: An exception occurred processing
JSP
page /useTag.jsp at line 40
39: <table>
40: <myTags:SimpleTagTest movieList="${movie}">
41: <tr>
42: <td>${movie.name}</td>
43: <td>${movie.genre}</td>
David O'Meara
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posted 14 years ago
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the object bound to the name "movie" is somehow both a list of items and a single item?
Zhang Jones
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posted 14 years ago
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a list of items
David O'Meara
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posted 14 years ago
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but your tag library then sets the name "movie" to be an item and the JSTL refers to ${movie.name}
It can't be both.
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