The <% @ taglib %> command must be used to format tags on the JSP page,
<% @ Taglib prefex = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
<C: set> A tag can store variables in a JSP range or a JavaBean attribute.
Five formats are available:
1, <c: set var = "username" value = "value"> </c: set> // specify the variable name and value.
2, <c: set var = "username" value = "value" scope = "page | request | session | application"> </c: set> Save the value to the variable whose range is scope.
3, <c: set var = "username" scope = "page | request | session | application">
Text Content
</C: set> store text content data to a variable in the scope.
4. <c: set value = "value" target = "target" property = "propertyName"> </c: set> stores the value in the properties of the target object.
5, <c: settarget = "target" property = "propertyName">
Text Content
</C: set> store text content data to the properties of the target object.
<C: out> labels are used to display data content. There are four format syntaxes.
1, <c: out value = "value"> </c: out> use the value attribute to specify the value to be displayed.
2. <c: out value = "value" escapeXml = "true | false"> </c: out> whether to output the content in the value as is
3. <c: out value = "value" default = "No Data"> </c: out> use the Default attribute to set the default value.
4, <c: out value = "value" escapeXml = "true | false">
Text Content
</C: out> set the default value through text content
<C: remove> used to remove a variable from a specified range.
<C: remove var = "number" scope = "session">
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<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
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<% @ Taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
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<! DOCTYPE html>
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<Html>
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<Head>
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<Title> Use of the remove tag </title>
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</Head>
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<Body>
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<H1> Use of the remove tag 10
<Hr/>
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<% -- Add variable number, stored in page range -- %>
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<C: set var = "number" value = "$ {1 + 2}" scope = "page"/>
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<% -- Output variable -- %>
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Number: <c: out value = "$ {pagination. number}" default = "No Data"/>
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<% -- Remove the number variable in the page range -- %>
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<C: remove var = "number" scope = "page"/>
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<% -- Output variable -- %>
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Number: <c: out value = "$ {pagination. number}" default = "No Data"/>
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</Body>
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</Html>
<C: if> labels are used for process control.
<C: if> A tag can be in either of the following formats:
1. <c: if test = "condition" var = "varName" [scope = "{page | request | session | application}"]/>
2. <c: if test = "condition" var = "varName" [scope = "{page | request | session | application}"]> body content </c: if>
<C: choose> <c: when> <c: otherwise> label
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<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
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<% @ Taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
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<! DOCTYPE html>
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<Html>
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<Head>
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<Title> Use of Choose labels </title>
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</Head>
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<Body>
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<H1> use of the Choose tag 10
<Hr/>
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<C: choose>
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<C: when test = "$ {4 <6}">
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<C: out value = "Yes"/>
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</C: when>
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<C: otherwise>
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<C: out value = "No"/>
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</C: otherwise>
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</C: choose>
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</Body>
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</Html>
<C: forEach> label
A member used to traverse a collection object.
<C: forEach [var = "username"] items = "collection" [varStatus = "varStatusName"] [begin = "begin"] [end = "end"] [step = "step" ]>
Local content
</C: forEach>
One is used to set the number of times the statement is executed cyclically.
<C: forEach [var = "username"] [varStatus = "varStatusName"] [begin = "begin"] [end = "end"] [step = "step"]>
Local content
</C: forEach>
<C: forTokens> tag used to separate strings based on specified delimiters
<C: forTokens [var = "varname"] items = "stringOfTokens" delims = "delimiters" [varStatus = "varStatusName"] [begin = "begin"] [end = "end"] [step = "step"]>
Local content
</C: forEach>
<C: import> tag, which can include static or dynamic files to its own JSP webpage
<C: import url = "url" [context = "context"] [var = "varname"] [scope = "{page | request | session | application}"] [charEncoding = "charEncoding "]>
Local content
</C: import>
<C: param> label used to pass Parameters
<C: url> tag used to generate a URL
Without Parameters
<C: url value = "value" [context = "context"] [var = "varname"] [scope = "{page | request | session | application}"]/>
Parameters
<C: url = "url" [context = "context"] [var = "varname"] [scope = "{page | request | session | application}"]>
<C: param/> label
</C: url>
<C: redirect> tag, which can jump from one JSP page to another.
Without Parameters
<C: redirect url = "url" [context = "context"]/>
Parameters
<C: redirect url = "url" [context = "context"]>
<C: param/> label
</C: redirect>
From Zhang Dapeng's blog
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