锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20122;&#27954;&#19968;&#21306;&#20108;&#21306;&#22312;&#32447;&#20813;&#36153;&#30475;&#44;&#20037;&#20037;&#20037;&#20037;&#30005;&#24433;&#44;&#26085;&#26412;&#20037;&#20037;&#20108;&#21306;</title><link>http://www.aygfsteel.com/wangbbs2007/category/42034.html</link><description>http://www.aygfsteel.com/wangbbs2007/</description><language>zh-cn</language><lastBuildDate>Fri, 09 Oct 2009 19:03:50 GMT</lastBuildDate><pubDate>Fri, 09 Oct 2009 19:03:50 GMT</pubDate><ttl>60</ttl><item><title>EL(Excepress Language琛ㄨ揪寮忚璦�) </title><link>http://www.aygfsteel.com/wangbbs2007/articles/297598.html</link><dc:creator>涔恓ava涔?/dc:creator><author>涔恓ava涔?/author><pubDate>Fri, 09 Oct 2009 12:25:00 GMT</pubDate><guid>http://www.aygfsteel.com/wangbbs2007/articles/297598.html</guid><wfw:comment>http://www.aygfsteel.com/wangbbs2007/comments/297598.html</wfw:comment><comments>http://www.aygfsteel.com/wangbbs2007/articles/297598.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/wangbbs2007/comments/commentRss/297598.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/wangbbs2007/services/trackbacks/297598.html</trackback:ping><description><![CDATA[1.....鎵�鏈夌殑EL閮芥槸浠?"{"寮�濮?浠?}"緇撳熬鐨?渚?${sessionScope.user.sex}(sessionScope鏄疎L鐨勫唴緗璞?鍚庨潰浼?xì)璁插?.璇ヤ緥瀛愮殑鎰忔�濇槸:浠巗ession涓彇寰楃敤鎴風(fēng)殑鎬у埆.鐩稿綋浜庝笅闈㈢殑浠ｇ爜 <br />
&lt;% <br />
User user=(User)session.getParameter("user"); <br />
String sex=user.getSex(); <br />
%&gt; <br />
<br />
2......EL鎻愪緵"."鍜?[ ]"涓ょ榪愮畻絎︽潵瀛樺彇鏁版嵁,[]鍙互璁塊棶闆嗗悎鎴栬�呮暟緇勭殑鍏冪礌,Bean鐨勫睘鎬?涓嬪垪涓よ�呮墍浠ｈ〃鐨勬剰鎬濇槸涓�鏍風(fēng)殑,浣嗘槸闇�瑕佷繚璇佽鍙栧緱瀵硅薄鐨勫摢涓殑灞炴�ф湁鐩稿簲鐨剆etXxx()鍜実etXxx()鏂規(guī)硶鎵嶈(鍗崇鍚圝avaBean瑙勮寖) <br />
渚? <br />
${sessionScope.user.set} &lt;=======&gt; ${session.user["sex"]}.&nbsp; "."鍜?[]"涔熷彲浠ユ販鍚堜嬌鐢?濡備笅:${sessionScope.shoppingCart[0].price} 榪斿洖緇撴灉涓簊hoppingCart涓涓�欏圭墿鍝佺殑浠鋒牸 <br />
鍦‥L涓?瀛楃涓插嵆鍙互鐢?abc",涔熷彲浠ヤ嬌鐢?abc'; <br />
<br />
3......EL榪愮畻絎?<br />
EL鐨勭畻鏈繍綆楃鍜孞AVA涓殑榪愮畻絎﹀ぇ鑷寸浉鍚?浼樺厛綰т篃鐩稿悓,鍖哄埆鍦ㄤ簬"+"榪愮畻絎︿笉浼?xì)杩炴帴瀛椊W︿覆,鍙敤浜庡姞娉曡繍綆? <br />
EL鍏崇郴榪愮畻絎︽湁浠ヤ笅6涓?<br />
鍏崇郴榪愮畻絎﹀彿 &nbsp; 璇存槑 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 涓句緥 緇撴灉 <br />
==鎴杄q(equal) 絳変簬 ${5==5}鎴?{5eq5} true <br />
!=鎴杗e(not equal) 涓嶇瓑浜?${5!=5}鎴?{5eq5} false <br />
&lt;鎴杔t(less than) 灝忎簬 ${3!=5}鎴?{3lt5} true <br />
&gt;鎴杇t(great than) 澶т簬 鐣?<br />
&lt;=鎴杔e 灝忎簬絳変簬 鐣?<br />
&gt;=鎴杇e 澶т簬絳変簬 鐣?<br />
<br />
<br />
4.......empty榪愮畻絎?<br />
empty榪愮畻絎︿富瑕佺敤鏉ュ垽鏂�兼槸鍚︿負(fù)null鎴栫┖鐨?濡傛灉涓虹┖鎴杗ull灝辮繑鍥瀟rue. 渚嬪 ${empty param.name}(param鍐呯疆瀵硅薄,鍚庨潰璁茶В) <br />
<br />
5........浣跨敤EL浠庤〃杈句腑鍙栧緱鏁版嵁 <br />
涓庤緭鍏ユ湁鍏崇殑闅愬惈瀵硅薄鏈変袱涓?param鍜宲aramValues,浠栦滑涓や釜鏄疎L涓殑鍐呯疆瀵硅薄.涓�鑸�岃█,鎴戜滑鍦ㄥ彇寰楃敤鎴風(fēng)殑璇鋒眰鍙傛暟鏃?鍙互鍒╃敤涓嬪垪鏂規(guī)硶:request.getParameter(String name)鍜宺equest.getParameterValues(String name),鑰屽湪EL涓彲浠ユ槸鐢╬aram鍜宲aramValues涓よ�呮潵鍙栧緱鏁版嵁.浠ヤ笂鐨勪袱鍙ョ瓑浠蜂簬${param.name}鍜?{paramValues.name},鑰?{paramValues.hobbies[0]}鍙互閫氳繃鎸囧畾涓嬫爣鏉ヨ闂壒瀹氱殑鍙傛暟鐨勫�? <br />
<br />
EL鐨勫唴緗璞?<br />
灞炴�ц寖鍥?鍦‥L涓殑瀵硅薄 <br />
page pageScope <br />
request requestScope <br />
session sessionScope <br />
application applicationScope <br />
鍦‥L涓嬌鐢ㄥ唴緗璞＄殑灞炴�?{requestScope.user}絳変環(huán)浜?&lt;%=request.getParameter("user")%&gt;. 濡傛灉涓嶆寚瀹氳寖鍥?閭ｅ氨浼?xì)鍦ㄤ笉鍚岀殑鑼冨洿闂礃q涜鎼滅儲. <br />
<br />
&nbsp; 瀵硅薄&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 綾?鍨?nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 璇?鏄?<br />
PageContext&nbsp; &nbsp; &nbsp; |&nbsp; javax.servlet.ServletContext |琛ㄧず姝SP鐨凱ageContext <br />
----------------------------------------------------------------------------------- <br />
PageScope&nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱Page鑼冨洿鐨勫睘鎬у悕縐版墍瀵瑰簲鐨勫�?<br />
------------------------------------------------------------------------------------- <br />
RequestScope&nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱Request鑼冨洿鐨勫睘鎬у悕縐版墍瀵瑰簲鐨勫�?<br />
------------------------------------------------------------------------------------- <br />
sessionScope&nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱Session鑼冨洿鐨勫睘鎬у悕縐版墍瀵瑰簲鐨勫�?<br />
------------------------------------------------------------------------------------- <br />
applicationScope |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱Application鑼冨洿鐨勫睘縐版墍瀵瑰簲鐨勫�?<br />
------------------------------------------------------------------------------------- <br />
param&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |濡傚悓ServletRequest.getParameter(String&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |name)榪斿洖String綾誨瀷鐨勫�?<br />
---------------------------------------------------------------------------------------- <br />
paramValues&nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |濡傚悓ServletRequest.getParameterValues&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |(String name)銆傝繑鍥濻tring []綾誨瀷鐨勫�?<br />
----------------------------------------------------------------------------------------- <br />
header&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |濡傚悓ServletRequest.getHeader(String name)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |榪斿洖String綾誨瀷鐨勫�?<br />
------------------------------------------------------------------------------------------ <br />
headerValues&nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |濡傚悓ServletRequest.getHeaders(String name)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |銆傝繑鍥濻tring []綾誨瀷鐨勫�?<br />
------------------------------------------------------------------------------------------ <br />
cookie&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |濡傚悓HttpServletRequest.getCookies( ) <br />
------------------------------------------------------------------------------------------ <br />
initParam&nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; java.util.Map&nbsp; &nbsp; &nbsp; &nbsp; |濡傚悓ServletContext.getInitParameter(String&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |name)銆傝繑鍥濻tring綾誨瀷鐨勫�?<br />
------------------------------------------------------------------------------------------- <br />
<br />
<br />
pageContext瀵硅薄 <br />
<br />
鎴戜滑鍙互浣跨敤 ${pageContext}鏉ュ彇寰楀叾浠栨湁鍏崇敤鎴瘋姹傛垨欏甸潰鐨勮緇嗕俊鎭�備笅闈㈠垪鍑轟簡鍑犱釜姣旇緝甯哥敤鐨勯儴鍒嗐�?<br />
<br />
Expression&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 璇?鏄?<br />
${pageContext.request}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱璇鋒眰瀵硅薄 <br />
${pageContext.session}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱session瀵硅薄&nbsp; <br />
${pageContext.request.queryString}&nbsp; &nbsp; &nbsp; |鍙栧緱璇鋒眰鐨勫弬鏁板瓧絎︿覆 <br />
${pageContext.request.requestURL}&nbsp; &nbsp; &nbsp; |鍙栧緱璇鋒眰鐨刄RL錛屼絾涓嶅寘鎷姹備箣鍙傛暟瀛楃涓?<br />
${pageContext.request.contextPath}&nbsp; &nbsp; &nbsp; |鏈嶅姟鐨剋eb application鐨勫悕縐?<br />
${pageContext.request.method}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱HTTP鐨勬柟娉?GET銆丳OST) <br />
${pageContext.request.protocol}&nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱浣跨敤鐨勫崗璁?HTTP/1.1銆丠TTP/1.0) <br />
${pageContext.request.remoteUser}&nbsp; &nbsp; &nbsp; |鍙栧緱鐢ㄦ埛鍚嶇О <br />
${pageContext.request.remoteAddr }&nbsp; &nbsp; &nbsp; |鍙栧緱鐢ㄦ埛鐨処P鍦板潃 <br />
${pageContext.session.new}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |鍒ゆ柇session鏄惁涓烘柊鐨勶紝鎵�璋撴柊鐨剆ession錛岃〃紺哄垰鐢?&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; server浜х敓鑰宑lient灝氭湭浣跨敤 <br />
${pageContext.session.id}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |鍙栧緱session鐨処D <br />
${pageContext.servletContext.serverInfo}|鍙栧緱涓繪満绔殑鏈嶅姟淇℃伅 <br />
<br />
<br />
JSTL錛圝SP鏍囧噯鏍囩搴擄級 <br />
<br />
JSTL鐢辨牳蹇冩爣絳撅紝 &lt;c:... &gt; 錛寈ml瑙ｆ瀽鏍囩 &lt;x:...&gt;錛屽浗闄呭寲鏍囩 &lt;fmt:....&gt;錛屾暟鎹簱璁塊棶鏍囩 &lt;sql:...&gt;錛屽嚱鏁版爣絳?&lt;fn:...&gt; <br />
<br />
鏍稿績鏍囩 <br />
Core <br />
&lt;%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%&gt; <br />
<br />
灞炴�ц緗?<br />
&lt;c:set&gt; 璁劇疆灞炴�?<br />
&lt;c:remove&gt; 縐婚櫎璁劇疆鐨勫睘鎬?<br />
<br />
榪囩▼鎺у埗 <br />
<br />
&lt;c:if test="..."&gt; 鏉′歡鏍囩 鍙湁鍦╰est灞炴�х殑鍊間負(fù)true鏄墠浼?xì)鎵ц鏍嚱{句綋&nbsp; <br />
渚嬶細(xì) <br />
&lt;c:if test="${!(empty user.age)}"&gt; <br />
&nbsp; &nbsp; &nbsp; &lt;h1&gt;hello &lt;/h1&gt; <br />
&lt;/c:if&gt; <br />
&nbsp; <br />
&lt;c:choose&gt;choose鍜寃hen鏄粍鍚堝湪涓�璧蜂嬌鐢ㄧ殑錛屾湁鐐圭被浼間簬switch case鐨勮娉?nbsp; 銆?<br />
&lt;c:when test="..."&gt;when涔熸槸鏉′歡鍒ゆ柇鏍囩錛宼est灞炴�х殑鍊間負(fù)true鏄墠浼?xì)鎵ц鏍嚱{句綋銆?<br />
渚嬶細(xì) <br />
&lt;c:choose&gt; <br />
&lt;c:when test="${param.age &lt;18}"&gt; <br />
&nbsp; &lt;h1&gt;you is a child &lt;h1&gt; <br />
&lt;/c:when&gt; <br />
&lt;c:when test="${param.age&gt;18 and param.age &lt;50 }"&gt; <br />
&nbsp; &nbsp; &lt;h1&gt;you is a young person &lt;/h1&gt; <br />
&lt;/c:when&gt; <br />
&lt;c:when test="${param.age&gt;50}"&gt; <br />
&nbsp; &nbsp; &lt;h1&gt;you is a old person &lt;/h1&gt; <br />
&lt;/c:when&gt; <br />
&lt;/c:choose&gt;&nbsp; <br />
<br />
&lt;c:forEach&gt;榪唬鏍囩 <br />
渚? <br />
&lt;c:forEach var="book" item="${store.books}" varStatus="status"&gt; <br />
&nbsp; &nbsp; &lt;h1&gt;${book.parice} &lt;/h1&gt; <br />
&lt;/c:forEach&gt; <br />
&lt;c:forEach begin="1" end="5" step="1"&gt; <br />
&nbsp; &nbsp; &lt;h1&gt;hello &lt;/h1&gt; <br />
&lt;/c:forEach&gt; <br /><img src ="http://www.aygfsteel.com/wangbbs2007/aggbug/297598.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/wangbbs2007/" target="_blank">涔恓ava涔?/a> 2009-10-09 20:25 <a href="http://www.aygfsteel.com/wangbbs2007/articles/297598.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss>                                                                       <footer>
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