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AndriiPiatakhaAndriiPiatakha
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Custom JSP Tags demo
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‎online-store.web/pom.xml‎

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<artifactId>online-store.core</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.tomcat</groupId>
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<artifactId>tomcat-jsp-api</artifactId>
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<version>10.0.0-M10</version>
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<scope>provided</scope>
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</dependency>
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</dependencies>
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<build>

‎online-store.web/src/main/java/com/itbulls/learnit/onlinestore/web/tags/DynamicAttributesTagHandler.java‎

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package com.itbulls.learnit.onlinestore.web.tags;
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import java.io.IOException;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import jakarta.servlet.jsp.JspException;
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import jakarta.servlet.jsp.JspWriter;
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import jakarta.servlet.jsp.tagext.DynamicAttributes;
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import jakarta.servlet.jsp.tagext.SimpleTagSupport;
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public class DynamicAttributesTagHandler extends SimpleTagSupport implements DynamicAttributes {
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private Map<String, Object> dynamicAttributes = new LinkedHashMap<>();
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@Override
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public void setDynamicAttribute(String uri, String localName, Object value) throws JspException {
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dynamicAttributes.put(localName, value);
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}
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@Override
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public void doTag() throws JspException, IOException {
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JspWriter out = getJspContext().getOut();
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out.println("<ul>");
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for (Map.Entry<String, Object> entry : dynamicAttributes.entrySet()) {
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out.println("<li style=\"color:" + entry.getValue() + "\">"
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+ entry.getKey() + "</li>");
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}
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out.println("</ul>");
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}
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}

‎online-store.web/src/main/java/com/itbulls/learnit/onlinestore/web/tags/HelloTagHandler.java‎

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package com.itbulls.learnit.onlinestore.web.tags;
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import java.io.IOException;
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import java.util.Collection;
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import jakarta.servlet.jsp.JspException;
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import jakarta.servlet.jsp.JspWriter;
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import jakarta.servlet.jsp.tagext.SimpleTagSupport;
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public class HelloTagHandler extends SimpleTagSupport {
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private String message;
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private Collection<Object> coll;
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public void setMessage(String msg) {
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this.message = msg;
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}
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public void setColl(Collection<Object> coll) {
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this.coll = coll;
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}
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@Override
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public void doTag() throws JspException, IOException {
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JspWriter out = getJspContext().getOut();
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if (coll != null) {
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out.println("<p>Hello from Custom Tag!" + " Value of 'message' attribute: \""
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+ message + "\" and size of \"coll\" attribue is " + coll.size() + "</p>");
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} else {
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out.println("<p>Hello from Custom Tag!" + " Value of 'message' attribute: \""
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+ message + "\"</p>");
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}
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}
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}

‎online-store.web/src/main/webapp/WEB-INF/custom.tld‎

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<taglib>
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<tlib-version>1.0</tlib-version>
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<jsp-version>3.0</jsp-version>
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<short-name>Example TLD</short-name>
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<tag>
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<name>helloTag</name>
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<tag-class>com.itbulls.learnit.onlinestore.web.tags.HelloTagHandler
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</tag-class>
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<body-content>empty</body-content>
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<attribute>
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<name>message</name>
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</attribute>
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<attribute>
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<name>coll</name>
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<type>java.util.Collection</type>
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<rtexprvalue>true</rtexprvalue>
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</attribute>
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</tag>
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<tag>
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<name>coloredListItems</name>
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<tag-class>com.itbulls.learnit.onlinestore.web.tags.DynamicAttributesTagHandler
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</tag-class>
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<body-content>empty</body-content>
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<dynamic-attributes>true</dynamic-attributes>
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</tag>
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</taglib>

‎online-store.web/src/main/webapp/WEB-INF/tags/general/footer.tag‎

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<div style="width:100%;height:50px;background:grey;text-align:center">
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My Custom Footer
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</div>

‎online-store.web/src/main/webapp/WEB-INF/tags/general/fragment-demo.tag‎

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<%@ tag language="java" pageEncoding="UTF-8"%>
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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
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<%@ attribute name="footerStyle" required="true" %>
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<%@ attribute name="footerRegular" fragment="true"%>
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<%@ attribute name="footerContactForm" fragment="true"%>
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<div>
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<div>
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<jsp:doBody/>
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</div>
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<c:if test="${footerStyle eq 'regular'}">
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<div>
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<jsp:invoke fragment="footerRegular"/>
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</div>
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</c:if>
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<c:if test="${footerStyle eq 'contact-form'}">
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<div>
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<jsp:invoke fragment="footerContactForm"/>
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</div>
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</c:if>
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</div>

‎online-store.web/src/main/webapp/WEB-INF/tags/general/printArray.tag‎

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<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
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<%@ attribute name="coll" type="java.util.Collection" required="true"%>
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<table border="1">
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<c:forEach items="${coll}" var="item">
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<tr>
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<td>
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${item}
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</td>
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</tr>
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</c:forEach>
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</table>

‎online-store.web/src/main/webapp/jsp-tags-demo.jsp‎

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<%@ taglib prefix="g" tagdir="/WEB-INF/tags/general"%>
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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
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<%@ taglib prefix="custom" uri="/WEB-INF/custom.tld"%>
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>JSP Tags Demo</title>
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</head>
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<body>
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<g:footer/>
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<p>==========</p>
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<c:set var="arr" value="${['Apple', 'Banana', 'Orange']}"/>
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<g:printArray coll="${arr}"/>
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<p>==========</p>
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<custom:helloTag/>
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<custom:helloTag message="test message"/>
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<custom:helloTag message="test message" coll="${arr}"/>
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<p>==========</p>
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<g:fragment-demo footerStyle="regular">
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<jsp:attribute name="footerRegular">
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This is regular footer fragment
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</jsp:attribute>
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<jsp:attribute name="footerContactForm">
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This is footer with contact form fragment
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</jsp:attribute>
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<jsp:body>
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This is body of JSP Custom Tag
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</jsp:body>
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</g:fragment-demo>
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<p>==========</p>
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<g:fragment-demo footerStyle="contact-form">
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<jsp:attribute name="footerRegular">
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This is regular footer fragment
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</jsp:attribute>
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<jsp:attribute name="footerContactForm">
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This is footer with contact form fragment
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</jsp:attribute>
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<jsp:body>
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This is body of JSP Custom Tag
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</jsp:body>
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</g:fragment-demo>
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<p>==========</p>
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<custom:coloredListItems item1="red" item2="green" item3="orange"/>
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</body>
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</html>

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