Pendahuluan
Untuk membuat Custom Tag di JSP, ikuti langkah-langkah dibawah ini:
Membuat Tag Handler
Buatlah kelas NumberFormatTag.java seperti di bawah ini:package com.mbj.jsp.customtag;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.io.IOException;
import java.text.DecimalFormat;
public class NumberFormatTag extends SimpleTagSupport {
private String format;
private String number;
public NumberFormatTag() {
}
public void setFormat(String format) {
this.format = format;
}
public void setNumber(String number) {
this.number = number;
}
@Override
public void doTag() throws JspException, IOException {
System.out.println("Number is:" + number);
System.out.println("Format is:" + format);
try {
double amount = Double.parseDouble(number);
DecimalFormat formatter = new DecimalFormat(format);
String formattedNumber = formatter.format(amount);
getJspContext().getOut().write(formattedNumber);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Membuat File TLD
Buatlah file mbjtld.tld seperti di bawah ini:
<?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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">
<description>Number Format Tag</description>
<tlib-version>2.1</tlib-version>
<short-name>mbjtag</short-name>
<uri>http://www.mbj.web.id/jsp/tlds/mbjtag</uri>
<tag>
<name>formatNumber</name>
<tag-class>com.mbj.jsp.customtag.NumberFormatTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>format</name>
<required>true</required>
</attribute>
<attribute>
<name>number</name>
<required>true</required>
</attribute>
</tag>
</taglib>
Letakkan file mbjtld.tld di folder WEB-INF/tld
Membuat File Document Descriptor (web.xml)
Setelah membuat TLD, saatnya TLD tadi kita tambahkan di file web.xml, seperti di bawah ini:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>JSP Custom Tags</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<jsp-config>
<taglib>
<taglib-uri>http://mbj.web.id/jsp/tlds/mbjtag</taglib-uri>
<taglib-location>/WEB-INF/tld/mbjtld.tld</taglib-location>
</taglib>
</jsp-config>
</web-app>
Membuat Halaman JSP
Buatlah file JSP numberformat.jsp seperti di bawah ini:
<%@ page language="java" contentType="text/html; charset=US-ASCII"
pageEncoding="US-ASCII"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Contoh Custom Tag</title>
<%@ taglib uri="http://mbj.web.id/jsp/tlds/mbjtag" prefix="mbj"%>
</head>
<body>
<h2>Contoh Number Fomatting menggunakan Custom Tag</h2>
<mbj:formatNumber number="51203.20" format="#,###.00"/><br><br>
<mbj:formatNumber number="1234.567" format="$# ###.00"/><br><br>
</body>
</html>
Download Source Code
Silahkan download source codenya disini.
Penutup
Sekian pembahasan tutorial kali ini, semoga bermanfaat.
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