The JSTL <c:if> Core Tag is used in control flow. It evaluates an expression and execute a specific block of code is result returns true. Syntax: <c:if test ="testCondition"> //block of code </c:if><c:if test ="testCondition"> //block of code </c:if> c:if tag attributes: Attribute Description Required test It specify the condition to evaluate. Yes var It … Read more
The JSTL <c:catch> Core Tag is used in exception handling to catch any Throwable object in its body. Syntax: <c:catch var ="variableName"> //exception code </c:catch><c:catch var ="variableName"> //exception code </c:catch> c:catch tag attributes: Attribute Description Required var It specify the name of the variable to hold the java.lang.Throwable if thrown by elements in the body. … Read more
The JSTL <c:remove> Core Tag is used to remove a variable from a specific scope. Syntax: <c:remove var=”varName”/> c:remove tag attributes: Attribute Description Required var It specify the name of the variable to be removed. Yes scope It specify the scope of the variable to be removed. No Example: test.jsp <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> … Read more
The JSTL <c:set> Core Tag is used to set a value to a variable or object in a specific scope like session. It works like setProperty action but the difference is that it can take a expression as an input, evaluate it and assign result to a variable or object. Syntax: <c:set var=”varName” value=”value/expression” /> … Read more
The JSTL <c:out> Core Tag is used to display the value of an expression to the client’s browser. It works same as of < Syntax: <c:out value=”value/expression” /> c:out tag attributes: Attribute Description Required value Information to output Yes default Fallback information to output No escapeXml True if the tag should escape special XML characters … Read more
The JSTL core tags are used for iteration, condition checking, URL management etc. Core tags are most commonly used. Syntax: < JSTL Core tags are given below: JSTL Core Tags with example. JSTL c:out Core Tag with example. JSTL c:set Core Tag with example. JSTL c:remove Core Tag with example. JSTL c:catch Core Tag with … Read more
JSTL stands for JSP Standard Tag Library. It provides the no. of tags used for iteration, condition checking, manipulating XML documents etc. Advantages of JSTL: Code reusability. Scriplet tags are not needed. Types of JSTL tags: JSTL Core Tags JSTL Formatting tags JSTL SQL tags JSTL XML tags JSTL Functions 1. JSTL Core Tags: … Read more
Exception handling is a mechanism to handle runtime errors, so that normal flow of the program can be maintained. Ways of exception handling in JSP: Using page directive (errorPage and isErrorPage attributes). Using <error-page> attribute of web.xml. Exception handling example using errorPage and isErrorPage attributes: welcome.jsp <%@ page errorPage="errorPage.jsp" %> <html> <head> <title>isErrorPage and … Read more
jsp:useBean action tag: jsp:useBean action tag is used to instantiate a bean class. It first search for an existing instance using id and scope variables. If object is not found than it creates bean class object. Commonly used attributes of jsp:useBean: 1. id: This attribute is used to uniquely identify the bean class within the … Read more
The jsp:param action tag is used pass the parameters from JSP to other resource like jsp or servlet. Syntax: <jsp: param name=”paramName” value=”paramValue”/> Example: welcome.jsp <html> <head> <title>param action example</title> </head> <body> <h3>Hello this is a param action example.</h3> <jsp:forward page="home.jsp"> <jsp:param name="websiteName" value="826.a00.myftpupload.com"/> </jsp:forward> </body> </html><html> <head> <title>param action example</title> </head> <body> <h3>Hello this … Read more