《JSP极简教程》c:forEach 如何输出序号
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使用<c:forEach>的varStatus属性，具体代码如下：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %><%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %><!DOCTYPE html><html lang="en"><head> <jsp:include page="../header.jsp"></jsp:include></head><body><jsp:include page="../top-nav.jsp"></jsp:include><div class="col-sm-12"> <h2>文章列表</h2> <div class="pull-right"> <a href="addBlog" class="btn btn-primary write-btn" target="_blank">写文章</a> </div> <table id="blogsTable" class="table table-hover"> <thead> <tr> <th>No</th> <th>Title</th> <th>Author</th> <%--<th>Content</th>--%> <th>CreateTime</th> </tr> </thead> <tbody> <c:forEach items="${blogs}" var="blog" varStatus="status"> <tr> <td>${status.index+1}</td> <td><a href="blog?id=${blog.id}" target="_blank">${blog.title}</a></td> <td>${blog.author}</td> <%--<td>${fn: substring(blog.content,0,100)}</td>--%> <td>${blog.gmtCreated}</td> </tr> </c:forEach> </tbody> </table></div><jsp:include page="../copyright.jsp"></jsp:include><script data-main="js/views/blog/config" src="js/libs/require/require.js"></script><script type="text/javascript"> require(['blog-list-view']);</script></body></html>备注：status.index是从0开始的。
完整的c标签的属性定义文档：
<?xml version="1.0" encoding="UTF-8" ?><taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" version="2.1"> <description>JSTL 1.1 core library</description> <display-name>JSTL core</display-name> <tlib-version>1.1</tlib-version> <short-name>c</short-name> <uri>http://java.sun.com/jsp/jstl/core</uri> <validator> <description> Provides core validation features for JSTL tags. </description> <validator-class> org.apache.taglibs.standard.tlv.JstlCoreTLV </validator-class> </validator> <tag> <description> Catches any Throwable that occurs in its body and optionally exposes it. </description> <name>catch</name> <tag-class>org.apache.taglibs.standard.tag.common.core.CatchTag</tag-class> <body-content>JSP</body-content> <attribute> <description>Name of the exported scoped variable for theexception thrown from a nested action. The type of thescoped variable is the type of the exception thrown. </description> <name>var</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag> <tag> <description> Simple conditional tag that establishes a context for mutually exclusive conditional operations, marked by <when> and <otherwise> </description> <name>choose</name> <tag-class>org.apache.taglibs.standard.tag.common.core.ChooseTag</tag-class> <body-content>JSP</body-content> </tag> <tag> <description> Simple conditional tag, which evalutes its body if the supplied condition is true and optionally exposes a Boolean scripting variable representing the evaluation of this condition </description> <name>if</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.IfTag</tag-class> <body-content>JSP</body-content> <attribute> <description>The test condition that determines whether ornot the body content should be processed. </description> <name>test</name> <required>true</required> <rtexprvalue>true</rtexprvalue> <type>boolean</type> </attribute> <attribute> <description>Name of the exported scoped variable for theresulting value of the test condition. The typeof the scoped variable is Boolean. </description> <name>var</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Scope for var. </description> <name>scope</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag> <tag> <description> Retrieves an absolute or relative URL and exposes its contents to either the page, a String in 'var', or a Reader in 'varReader'. </description> <name>import</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.ImportTag</tag-class> <tei-class>org.apache.taglibs.standard.tei.ImportTEI</tei-class> <body-content>JSP</body-content> <attribute> <description>The URL of the resource to import. </description> <name>url</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Name of the exported scoped variable for theresource's content. The type of the scopedvariable is String. </description> <name>var</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Scope for var. </description> <name>scope</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Name of the exported scoped variable for theresource's content. The type of the scopedvariable is Reader. </description> <name>varReader</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Name of the context when accessing a relativeURL resource that belongs to a foreigncontext. </description> <name>context</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Character encoding of the content at the inputresource. </description> <name>charEncoding</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> <tag> <description> The basic iteration tag, accepting many different collection types and supporting subsetting and other functionality </description> <name>forEach</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.ForEachTag</tag-class> <tei-class>org.apache.taglibs.standard.tei.ForEachTEI</tei-class> <body-content>JSP</body-content> <attribute> <description>Collection of items to iterate over. </description> <name>items</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <type>java.lang.Object</type> <deferred-value> <type>java.lang.Object</type> </deferred-value> </attribute> <attribute> <description>If items specified:Iteration begins at the item located at thespecified index. First item of the collection hasindex 0.If items not specified:Iteration begins with index set at the valuespecified. </description> <name>begin</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <type>int</type> </attribute> <attribute> <description>If items specified:Iteration ends at the item located at thespecified index (inclusive).If items not specified:Iteration ends when index reaches the valuespecified. </description> <name>end</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <type>int</type> </attribute> <attribute> <description>Iteration will only process every step items ofthe collection, starting with the first one. </description> <name>step</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <type>int</type> </attribute> <attribute> <description>Name of the exported scoped variable for thecurrent item of the iteration. This scopedvariable has nested visibility. Its type dependson the object of the underlying collection. </description> <name>var</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Name of the exported scoped variable for thestatus of the iteration. Object exported is of typejavax.servlet.jsp.jstl.core.LoopTagStatus. This scoped variable has nestedvisibility. </description> <name>varStatus</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag> <tag> <description> Iterates over tokens, separated by the supplied delimeters </description> <name>forTokens</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.ForTokensTag</tag-class> <body-content>JSP</body-content> <attribute> <description>String of tokens to iterate over. </description> <name>items</name> <required>true</required> <rtexprvalue>true</rtexprvalue> <type>java.lang.String</type> <deferred-value> <type>java.lang.String</type> </deferred-value> </attribute> <attribute> <description>The set of delimiters (the characters thatseparate the tokens in the string). </description> <name>delims</name> <required>true</required> <rtexprvalue>true</rtexprvalue> <type>java.lang.String</type> </attribute> <attribute> <description>Iteration begins at the token located at thespecified index. First token has index 0. </description> <name>begin</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <type>int</type> </attribute> <attribute> <description>Iteration ends at the token located at thespecified index (inclusive). </description> <name>end</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <type>int</type> </attribute> <attribute> <description>Iteration will only process every step tokensof the string, starting with the first one. </description> <name>step</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <type>int</type> </attribute> <attribute> <description>Name of the exported scoped variable for thecurrent item of the iteration. This scopedvariable has nested visibility. </description> <name>var</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Name of the exported scoped variable for thestatus of the iteration. Object exported is oftypejavax.servlet.jsp.jstl.core.LoopTagStatus. This scoped variable has nestedvisibility. </description> <name>varStatus</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag> <tag> <description> Like <%= ... >, but for expressions. </description> <name>out</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.OutTag</tag-class> <body-content>JSP</body-content> <attribute> <description>Expression to be evaluated. </description> <name>value</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Default value if the resulting value is null. </description> <name>default</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Determines whether characters <,>,&,'," in theresulting string should be converted to theircorresponding character entity codes. Default value istrue. </description> <name>escapeXml</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> <tag> <description> Subtag of <choose> that follows <when> tags and runs only if all of the prior conditions evaluated to 'false' </description> <name>otherwise</name> <tag-class>org.apache.taglibs.standard.tag.common.core.OtherwiseTag</tag-class> <body-content>JSP</body-content> </tag> <tag> <description> Adds a parameter to a containing 'import' tag's URL. </description> <name>param</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.ParamTag</tag-class> <body-content>JSP</body-content> <attribute> <description>Name of the query string parameter. </description> <name>name</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Value of the parameter. </description> <name>value</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> <tag> <description> Redirects to a new URL. </description> <name>redirect</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.RedirectTag</tag-class> <body-content>JSP</body-content> <attribute> <description>The URL of the resource to redirect to. </description> <name>url</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Name of the context when redirecting to a relative URLresource that belongs to a foreign context. </description> <name>context</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> <tag> <description> Removes a scoped variable (from a particular scope, if specified). </description> <name>remove</name> <tag-class>org.apache.taglibs.standard.tag.common.core.RemoveTag</tag-class> <body-content>empty</body-content> <attribute> <description>Name of the scoped variable to be removed. </description> <name>var</name> <required>true</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Scope for var. </description> <name>scope</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag> <tag> <description> Sets the result of an expression evaluation in a 'scope' </description> <name>set</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.SetTag</tag-class> <body-content>JSP</body-content> <attribute> <description>Name of the exported scoped variable to hold the valuespecified in the action. The type of the scoped variable iswhatever type the value expression evaluates to. </description> <name>var</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Expression to be evaluated. </description> <name>value</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <deferred-value> <type>java.lang.Object</type> </deferred-value> </attribute> <attribute> <description>Target object whose property will be set. Must evaluate toa JavaBeans object with setter property property, or to ajava.util.Map object. </description> <name>target</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Name of the property to be set in the target object. </description> <name>property</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Scope for var. </description> <name>scope</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> </tag> <tag> <description> Creates a URL with optional query parameters. </description> <name>url</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.UrlTag</tag-class> <body-content>JSP</body-content> <attribute> <description>Name of the exported scoped variable for theprocessed url. The type of the scoped variable isString. </description> <name>var</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>Scope for var. </description> <name>scope</name> <required>false</required> <rtexprvalue>false</rtexprvalue> </attribute> <attribute> <description>URL to be processed. </description> <name>value</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <description>Name of the context when specifying a relative URLresource that belongs to a foreign context. </description> <name>context</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> <tag> <description> Subtag of <choose> that includes its body if its condition evalutes to 'true' </description> <name>when</name> <tag-class>org.apache.taglibs.standard.tag.rt.core.WhenTag</tag-class> <body-content>JSP</body-content> <attribute> <description>The test condition that determines whether or not thebody content should be processed. </description> <name>test</name> <required>true</required> <rtexprvalue>true</rtexprvalue> <type>boolean</type> </attribute> </tag></taglib>阅读全文
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