{"id":69278,"date":"2021-08-16T20:38:52","date_gmt":"2021-08-17T00:38:52","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/recent-posts\/jsp-tags-37\/"},"modified":"2021-08-16T20:38:52","modified_gmt":"2021-08-17T00:38:52","slug":"jsp-tags-37","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=69278","title":{"rendered":"JSP Tags #37"},"content":{"rendered":"
\nJSP Tag Library (JSTL)\n\nJSP Disadvantage\n1. Java code embedded in scriptlets make the\n                                \n                                         code difficult to understand\n2. Reduced code reusability\n3. Difficult to modify [Java Code]\n4. Java code needs to use Class Casting\n\nJSTL Advantages\n\n1. Better code\n2. Enhanced Code reusability\n3. No type casting from the request and session objects\n4. Expression Language in JSP makes it easier to call getter and setter methods.\n\nDrawback\n\n1. Adds overhead as JSTL adds more into the resultant Servlet\n2. Can not do all that Java code can do\n\n\nFour Libraries:\n\nCore: Basic tags like loops, conditions, and input\/output\nfmt: Format like date format\nxml: XML processing\nsql: Database access\n\n\nCore Tag Library\n\n<%@ taglib prefix=\"core\" uri=\"http:\/\/java.sun.com\/jsp\/jstl\/core\" %> \n<core:set var=\"var\" scope=\"session\" value=\"...\"\/> \n\nConditional\n<core:if test=\"${condition}\"> <\/core:if> \n<core:choose>\n     <core:when test=\"condition1\" >\n     ...\n     <\/core:when>\n    <core:when test=\"condition2\" >\n    ...\n    <\/core:when>\n    <core:otherwise>\n    <\/core:otherwise>\n<\/core:choose>\n\n<core:otherwise> will be executed only and if only all other conditions fail.\n\n\nIterator\n\nIterator tages are used to traverse an array of objects and process each object (when required)\n<c:forEach var=\"item\" items=\"collection\">\n<\/c:forEach>\n\nor\n\n<c:forEach begin=\"0\" end=\"10\" varStatus=\"status\" step=\"1\" >\n<\/c:forEach>\n\n\nFunction Tag Library\n\nBasic String Functions\n<%@ taglib prefix=\"fn\" uri=\"http:\/\/java.sun.com\/jsp\/jstl\/functions\" %> \n\nExample\n<%@ taglib uri=\"\/WEB-INF\/fn.tld\" prefix=\"fn\" %>\n<%@ taglib prefix=\"core\" uri=\"http:\/\/java.sun.com\/jsp\/jstl\/core\" %> \n\n<core:set var=\"test\" value=\"Hello World\"\/>\nIndex of l is :- ${fn:indexOf(test, \"l\")}<br>\n\n<\/pre>\n
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 Post Data:2007-12-05 06:15:58<\/p>\n
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JSP Tag Library (JSTL) JSP Disadvantage 1. Java code embedded in scriptlets make the code difficult to understand 2. Reduced code reusability 3. Difficult to modify [Java Code] 4. Java code needs to use Class Casting JSTL Advantages 1. Better code 2. Enhanced Code reusability 3. No type casting from the request and session objects … <\/p>\n
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