JAVA-JSTL

JSTL (JSP Standard Tag Library)

The JavaServer Pages Standard Tag Library (JSTL) is a collection of useful JSP tags which encapsulates the core functionality common to many JSP applications.

JSTL has support for common, structural tasks such as iteration and conditionals, tags for manipulating XML documents, internationalization tags, and SQL tags. It also provides a framework for integrating the existing custom tags with the JSTL tags

pom.xml:

<dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

JSTL tags:

1->add this:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

core tags:

        catch tags: catches any throwable to occurs
        choose tags: conditional tags
        if tags: simple if/then conditional
        import tags: retrieves a URL
        forEach: collections of value
        forTokens: collections of token
        out : displaying output
        otherwise: <choose>
        param: add param URL
        redirect: new URL
        remove: remove scoped variables
        set: assigns an expression
        url: define a URL
        when: <choose> tag

for each:

<%
string[] citites={"mumbai","singapore"};
pageContext.setAttribute("mycities",citites);
%>

JSTL(for-each):

<body>
<c:forEach var="tempcity" items="${mycities}">
${tempcity} <br/>
</c:forEach>
</body>

pojo class:

####student.java:

    private String firstName;
    private String lastname;
    private String goldCusotmer;
    getter & setters
    constructor using fields

new jsp:

    <%
    List<Student> data=new ArrayList<>();
    data.add(new Student("john","Doe",false);
    data.add(new Student("ram","Johnson",false);
    data.add(new Student("sandy","doe",true);
    pageContext.setAttribute("mystudent",data);
    %>

    <body>
    <c:forEach var="tempStudent" items="${mystudent}">
    ${tempStudent.firstname},
    ${tempStudent.lastname},
    ${tempStudent.goldCusotmer}
    <br/>
    </c:forEach>

will display the pojo class value in JSP page.

    <c:if test="${tempStudent.goldSutomer}">
    special discount
    </c:if>

    <c:if test="${not tempStudent.goldSutomer}">
    no discount
    </c:if>

switch statment JSTL:

using choose:

        <c:choose>
        <c:when test="${tempStudent.goldSutomer}">
        special discount
        </c:when>

        <c:otherwise>
        no soup for you!
        </c:otherwise>

        </c:choose>

functional tags:

collections length:legth

string manipulation:

    toUpperCase,toLowerCase
    subString,subStringAfter,substringBefore
    trim,replace,indexOf,startsWith,endsWith
    contains,containsIgnoreCase,split,join,escapexml

length:

        <c:set var="data" value="luv2code"/>
        Length of the String <b>${data}</b> ${fn:length(data)}

        ${fn:length(data)}
        ${fn:toUpperCase(data)}
        ${fn:startsWith(data,"luv")}

        split and join:
        fn:split()

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