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AndriiPiatakhaAndriiPiatakha
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JSTL Demo
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‎online-store.web/pom.xml

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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.glassfish.web</groupId>
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<artifactId>jakarta.servlet.jsp.jstl</artifactId>
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<version>2.0.0</version>
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</dependency>
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<dependency>
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<groupId>com.learnit.itbulls</groupId>

‎online-store.web/src/main/java/com/itbulls/learnit/onlinestore/web/servlets/JstlDemoServlet.java

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package com.itbulls.learnit.onlinestore.web.servlets;
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import jakarta.servlet.http.HttpServlet;
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import java.io.IOException;
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import java.util.List;
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import com.itbulls.learnit.onlinestore.core.facades.UserFacade;
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import com.itbulls.learnit.onlinestore.core.facades.impl.DefaultUserFacade;
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import com.itbulls.learnit.onlinestore.persistence.enteties.User;
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import jakarta.servlet.ServletException;
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import jakarta.servlet.annotation.WebServlet;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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@WebServlet("/jstl-demo")
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public class JstlDemoServlet extends HttpServlet {
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private UserFacade userFacade = DefaultUserFacade.getInstance();
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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List<User> users = userFacade.getUsers();
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request.setAttribute("users", users);
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request.getRequestDispatcher("/jstl-demo.jsp").forward(request, response);
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}
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}

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

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<%@page import="org.apache.jasper.tagplugins.jstl.core.ForEach"%>
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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<%@ page import="java.util.Arrays" %>

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

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
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<%@ taglib prefix="fmt" uri = "http://java.sun.com/jsp/jstl/fmt" %>
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<%@ taglib prefix="fn" uri = "http://java.sun.com/jsp/jstl/functions" %>
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<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
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<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
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<!DOCTYPE>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>JSTL Demo</title>
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</head>
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<body>
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<p>========== Set and If Tags Demo ==========</p>
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<%-- scopes: page, request, session, application --%>
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<c:set var="testVar" value="100" scope="request"/>
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<c:if test="${testVar > 5}">
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<p>Test Var exist on the page and it is more than 5</p>
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</c:if>
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<p>========== For each loop Demo ==========</p>
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<c:if test="${users != null}">
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<table border="1">
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<c:forEach items="${users}" var="user">
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<tr>
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<td>
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${user.id}
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</td>
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<td>
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${user.firstName}
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</td>
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<td>
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${user.lastName}
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</td>
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<td>
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${user.email}
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</td>
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</tr>
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</c:forEach>
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</table>
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</c:if>
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<p>========== Remove Tag Demo ==========</p>
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<c:remove var="testVar" />
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<p>After Remove Value: <c:out value="${testVar}" /></p>
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<p>========== Out Tag Demo ==========</p>
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<p>
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Let's print "<html> text" with "escapeXml" set to "false":
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<c:out value="<html> text" escapeXml="false"/>
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</p>
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<p>
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Let's print "<html> text" with "escapeXml" set to "true":
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<c:out value="<html> text" escapeXml="true"/>
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</p>
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<p>
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Let's print null value with "deafult" set to "default":
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<c:out value="${null}" default="default"></c:out>
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</p>
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<p>========== Exception Handling Demo ==========</p>
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<%-- CATCH DEMO --%>
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<c:catch var="catchException">
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<%
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int x = 5 / 0;
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%>
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</c:catch>
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<c:if test="${not empty catchException}">
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<p>
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The exception is : ${catchException} <br /> There is an exception:
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${catchException.message}
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</p>
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</c:if>
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<p>========== Choose Tag Demo ==========</p>
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<c:set var="salary" scope="session" value="10000" />
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<p>
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Your salary is :
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<c:out value="${salary}" />
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</p>
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<c:choose>
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<c:when test="${salary le 1000}">
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You have a good salary.
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</c:when>
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<c:when test="${(salary gt 1000) and (salary lt 5000)}">
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Salary is very good.
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</c:when>
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<c:otherwise>
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I'm proud of you, sir :)
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</c:otherwise>
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</c:choose>
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<p>========== URL and Import Tags Demo ==========</p>
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<c:url value="jsp-include-demo.jsp" var="url" scope="session">
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<c:param name="partnerCode" value="123456" />
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<c:param name="couponCode" value="ASDFG" />
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</c:url>
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<p>URL is = ${url}</p>
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<c:import url="${url}" />
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<p>========== Formatting Tags Demo ==========</p>
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<h3>Number Format:</h3>
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<c:set var = "balance" value = "120000.2309" />
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<p>Formatted Number (1): <fmt:formatNumber value = "${balance}"
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type = "currency"/></p>
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<p>Formatted Number (2): <fmt:formatNumber type = "number"
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maxIntegerDigits = "3" value = "${balance}" /></p>
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<p>Formatted Number (3): <fmt:formatNumber type = "number"
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maxFractionDigits = "3" value = "${balance}" /></p>
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<p>Formatted Number (4): <fmt:formatNumber type = "number"
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groupingUsed = "false" value = "${balance}" /></p>
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<p>Formatted Number (5): <fmt:formatNumber type = "percent"
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maxIntegerDigits="3" value = "${balance}" /></p>
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<p>Formatted Number (6): <fmt:formatNumber type = "percent"
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minFractionDigits = "10" value = "${balance}" /></p>
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<p>Formatted Number (7): <fmt:formatNumber type = "percent"
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maxIntegerDigits = "3" value = "${balance}" /></p>
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<p>Formatted Number (8): <fmt:formatNumber type = "number"
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pattern = "###.###E0" value = "${balance}" /></p>
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<p>Currency in USA :
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<fmt:setLocale value = "en_US"/>
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<fmt:formatNumber value = "${balance}" type = "currency"/>
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</p>
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<%-- FORMAT DATE DEMO --%>
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<h3>Date Format:</h3>
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<c:set var = "now" value = "<%= new java.util.Date()%>" />
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<p>Formatted Date (1): <fmt:formatDate type = "time"
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value = "${now}" /></p>
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<p>Formatted Date (2): <fmt:formatDate type = "date"
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value = "${now}" /></p>
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<p>Formatted Date (3): <fmt:formatDate type = "both"
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value = "${now}" /></p>
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<p>Formatted Date (4): <fmt:formatDate type = "both"
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dateStyle = "short" timeStyle = "short" value = "${now}" /></p>
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<p>Formatted Date (5): <fmt:formatDate type = "both"
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dateStyle = "medium" timeStyle = "medium" value = "${now}" /></p>
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<p>Formatted Date (6): <fmt:formatDate type = "both"
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dateStyle = "long" timeStyle = "long" value = "${now}" /></p>
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<p>Formatted Date (7): <fmt:formatDate pattern = "yyyy-MM-dd"
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value = "${now}" /></p>
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<p>========== Function Tags Demo ==========</p>
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<%--FN DEMO contains --%>
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<c:set var = "theString" value = "I am a test String"/>
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<c:if test = "${fn:contains(theString, 'test')}">
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<p>Found test string<p>
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</c:if>
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<c:if test = "${fn:contains(theString, 'TEST')}">
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<p>Found TEST string<p>
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</c:if>
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<c:if test = "${fn:containsIgnoreCase(theString, 'test')}">
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<p>Found test string<p>
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</c:if>
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<c:if test = "${fn:containsIgnoreCase(theString, 'TEST')}">
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<p>Found TEST string<p>
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</c:if>
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<%--FN ends with --%>
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<c:set var = "theString" value = "I am a test String 123"/>
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<c:if test = "${fn:endsWith(theString, '123')}">
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<p>String ends with 123<p>
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</c:if>
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<c:if test = "${fn:endsWith(theString, 'TEST')}">
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<p>String ends with TEST<p>
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</c:if>
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<%-- DEMO index of --%>
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<c:set var = "string1" value = "This is first String."/>
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<c:set var = "string2" value = "This <abc>is second String.</abc>"/>
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<p>indexOf tag Demo in String 1: ${fn:indexOf(string1, "first")}</p>
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<p>indexOf tag Demo in String 2: ${fn:indexOf(string2, "second")}</p>
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<%-- SPLIT and JOIN FN --%>
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<c:set var = "string1" value = "This is first String."/>
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<c:set var = "string2" value = "${fn:split(string1, ' ')}" />
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<c:set var = "string3" value = "${fn:join(string2, '-')}" />
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<p>Split and Join tags Demo: ${string3}</p>
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<%--FN LENGTH --%>
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<c:set var = "string1" value = "This is first String."/>
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<c:set var = "string2" value = "This is second String." />
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<p>Length of String (1) : ${fn:length(string1)}</p>
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<p>Length of String (2) : ${fn:length(string2)}</p>
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<%-- FN replace --%>
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<c:set var = "string1" value = "This is first String."/>
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<c:set var = "string2" value = "${fn:replace(string1, 'first', 'second')}" />
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<p>Replace tag demo: ${string2}</p>
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<%-- FN starts with --%>
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<c:set var = "string" value = "Second: This is first String."/>
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<c:if test = "${fn:startsWith(string, 'First')}">
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<p>String starts with First</p>
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</c:if>
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<c:if test = "${fn:startsWith(string, 'Second')}">
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<p>String starts with Second</p>
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</c:if>
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<p>========== SQL Tags Demo ==========</p>
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<sql:setDataSource var="dataSource" driver="com.mysql.cj.jdbc.Driver"
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url="jdbc:mysql://localhost:3306/learn_it_db" user="root" password="root"/>
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<sql:query dataSource="${dataSource}" var="rs">
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SELECT * FROM user;
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</sql:query>
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<table border="1">
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<tr>
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<th>ID</th>
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<th>First Name</th>
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<th>Last Name</th>
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<th>Email</th>
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</tr>
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<c:forEach var="row" items="${rs.rows}">
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<tr>
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<td><c:out value="${row.id}"/></td>
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<td><c:out value="${row.first_name}"/></td>
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<td><c:out value="${row.last_name}"/></td>
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<td><c:out value="${row.email}"/></td>
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</tr>
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</c:forEach>
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</table>
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<p>========== XML Tags Demo ==========</p>
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<c:set var="employees">
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<employees>
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<employee>
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<firstname>John</firstname>
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<lastname>Smith</lastname>
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<role>Employee</role>
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<salary>110000</salary>
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</employee>
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<employee>
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<firstname>Jack</firstname>
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<lastname>Jackson</lastname>
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<role>Manager</role>
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<salary>170000</salary>
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</employee>
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</employees>
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</c:set>
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<x:parse xml="${employees}" var="xml"/>
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<p>The first name of the first employee from the XML:
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<x:out select="$xml/employees/employee[1]/firstname/text()" />
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</p>
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<p>The last name of the first employee from the XML:
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<x:out select="$xml/employees/employee[1]/lastname/text()" />
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</p>
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</body>
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</html>

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