Six weeks homework-jstl tag Library

JSP pages as inline Java HTML simplifies the syntax that servlets display on the control page, but the expressions in the JSP script are not powerful enough and the syntax is slightly more complex, EL (expression Language) The advent of expression languages can greatly simplify the Java code in JSP pages, with the JSTL core tag library, making JSP more flexible and easy to use.

JSTL (JSP standard tag LIBRARY,JSP standards Tag Library) is an open source JSP tag library that has been continuously perfected by the Apache Foundation.

Jstl tags are generally divided into the following five categories according to their functions:

1 tag library (core tags)

2. Formatting tags (formatting tags)

3.SQL tags (SQL tags)

4.XML tags (XML tags)

5.JSTL functions (JSTL function)

The JSTL Core Tag library (c tag) has a total of 13 tags, functionally divided into 4 categories:

1. Expression control Tags: out, set, remove, catch

2. Process Control Label: If, choose, when, otherwise

3. Loop control: ForEach, Fortokens

4.URL action tag: import, URL, redirect

An example of the EL expression syntax is as follows:

<c:out value= "welcome!" ></c:out>

is obviously easier to read than embedded Java.

　　

Six weeks homework-jstl tag Library