/// <!-- this must be added to the web application's web.xml --> <taglib> <taglib-uri>/java2s</taglib-uri> <taglib-location>/WEB-INF/java2s.tld</taglib-location> </taglib> // create Fichier:java2s.tld in the /WEB-INF/ <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd"> <!-- a tab library descriptor --> <taglibxmlns="http://java.sun.com/JSP/TagLibraryDescriptor"> <tlib-version>1.0</tlib-version> <jsp-version>1.2</jsp-version> <short-name>Java2s Simple Tags</short-name> <!-- this tag lists random numbers; the HTML is hard-coded within the tag handler --> <tag> <name>emptyTagWithAttrs</name> <tag-class>com.java2s.EmptyTagWithAttrs</tag-class> <body-content>empty</body-content> <attribute> <name>howMany</name> </attribute> </tag> </taglib> //compile the following code into WEB-INFclassescomjava2s package com.java2s; import java.io.IOException; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.TagSupport; /* This tag handler generates the random numbers. The "howMany" attribute specifies how many numbers to generate and display. */ public class EmptyTagWithAttrs extends TagSupport { // Code to implement the "howMany" attribute private int howMany; public int getHowMany() { return howMany; } public void setHowMany(int i) { howMany = i; } public int doStartTag() throws JspException { try { JspWriter out = pageContext.getOut(); for ( int i=0; i<this.howMany; i++ ) { int nextNumber = (int) (Math.random() * 10); out.println("<li>" + nextNumber + "</li>"); } // end of for () } catch (IOException e) { System.out.println("Error in EmptyTagWithAttrs.doStartTag()"); e.printStackTrace(); throw new JspException(e); // throw the error to the error page (if set) } // end of try-catch return SKIP_BODY; } } // start comcat and load the following jsp page in browser <%@ taglib uri="/java2s" prefix="java2s" %> <html> <head> <title>A custom tag: empty with attributes</title> </head> <body> This page uses a custom tag that has no body content, but takes an attribute called "howMany" that specifies how many random numbers to generate. Here is its output: <ul> <java2:emptyTagWithAttrshowMany="5" /> </ul> </body> </html> |
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