琛ㄨ揪寮忋?br />
璁╂垜浠潵鐪嬩唬鐮佷腑鐨勮繖涓夌浠庡睘褰㈠紡錛?
<%! int i = 1; %> <% -- Declaration --%>
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table.getColumn( ) <% -- Expression --%>
鍦ㄥ皢 EL 娣誨姞鍒?JSP 宸ュ叿鍖呬互鍚庯紝鍙互浣跨敤鏇寸畝鍗曠殑璇硶鏉ョ紪鍐欎互涓婄殑浠ｇ爜錛岃岃幏寰椾笌浠ヤ笂 JSP
鍏冪礌鐩稿悓鐨勭粨鏋溿侲L 琛ㄨ揪寮忕殑鍙︿竴涓紭鍔挎槸錛屽彲浠ュ湪涓嶅厑璁鎬嬌鐢ㄤ笂榪頒換浣曡剼鏈紪鍒跺厓绱犱粠灞炲艦寮忕殑鏃犺剼鏈殑 JSP
欏典腑浣跨敤瀹冦備絾鏄繀欏繪敞鎰忥紝鍙互涓嶄嬌鐢ㄤ笁縐嶈剼鏈紪鍒跺厓绱犱粠灞炲艦寮忎腑鐨勪換涓縐嶆潵緙栧啓 JSP 欏碉紝鑰屽 JSP
欏墊槸鍚﹀簲璇ヤ負鏃犺剼鏈艦寮忕殑閫夋嫨鍒欏畬鍏ㄥ熀浜庡簲鐢ㄧ▼搴忕殑闇姹傘傚鏋滄?zhèn)ㄥ笇鏈涙槑纭垎寮琛ㄨ揪涓庡晢鍔￠昏緫錛屽垯榪樺彲浠ラ夋嫨灝嗛〉闈㈠己鍒朵負鏃犺剼鏈艦寮忋傞氳繃寮哄埗鎴愪負鏃犺剼鏈〉
闈紝蹇呴』閫氳繃鍏朵粬鍏冪礌錛堝 JavaBean銆丒L 琛ㄨ揪寮忋佽嚜瀹氫箟鎿嶄綔鍜屾爣鍑嗘爣璁板簱錛夋彁渚?JSP 欏電殑鍔ㄦ佽涓恒?
鍦ㄦ棤鑴氭湰鐨?JSP 欏典腑鏀寔 EL 鐨勬満鍒?/h2>
鏈変袱縐嶆満鍒跺彲浠ョ‘淇濋〉闈笉鍖呭惈浠諱綍鑴氭湰緙栧埗鍏冪礌銆傛瘡縐嶆満鍒惰繕鎻愪緵鍦ㄦ棤鑴氭湰鐨?JSP 欏典腑鏀寔 EL 鐨勬柟娉曘?
浣跨敤閮ㄧ講鎻忚堪絎︾殑鍏冪礌錛?/h4>
褰撲嬌鐢ㄩ儴緗叉弿榪扮鐨勫厓绱犳椂錛屾?zhèn)ㄥ彲浠ラ氳繃鍦? 鏍囪闂村寘鍚竷?yōu)當鍊尖渢rue鈥濇垨鈥渇alse鈥濓紝鎸囧畾鏄惁鏀寔 EL錛屽涓嬫墍紺猴細
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琛ㄨ揪寮忚璦璇硶
JSP 琛ㄨ揪寮忚璦鍏佽欏甸潰鍒朵綔浜哄憳浣跨敤綆鍗曡娉曡闂粍浠訛紝濡傦細
${expr}
鍦ㄤ互涓婄殑璇硶涓紝expr 浠ｈ〃鏈夋晥鐨勮〃杈懼紡銆傚繀欏繪敞鎰忥紝璇ヨ〃杈懼紡鍙互涓庨潤鎬佹枃鏈販鍚堬紝榪樺彲浠ヤ笌鍏朵粬琛ㄨ揪寮忕粨鍚堟垚鏇村ぇ鐨勮〃杈懼紡銆?
JSP EL 涓殑鏈夋晥琛ㄨ揪寮?/h2>
鏈夋晥琛ㄨ揪寮忓彲浠ュ寘鍚枃瀛椼佹搷浣滅銆佸彉閲忥紙瀵硅薄寮曠敤錛夊拰鍑芥暟璋冪敤銆傛垜浠皢鍒嗗埆浜嗚В榪欎簺鏈夋晥琛ㄨ揪寮忎腑鐨勬瘡涓縐嶏細
鏂囧瓧
JSP 琛ㄨ揪寮忚璦瀹氫箟鍙湪琛ㄨ揪寮忎腑浣跨敤鐨勪互涓嬫枃瀛楋細
| 鏂囧瓧 | 鏂囧瓧鐨勫?/th> |
|---|
Boolean | true 鍜?false |
Integer | 涓?Java 綾諱技銆傚彲浠ュ寘鍚換浣曟鏁版垨璐熸暟錛屼緥濡?24銆?45銆?67 |
Floating Point | 涓?Java 綾諱技銆傚彲浠ュ寘鍚換浣曟鐨勬垨璐熺殑嫻偣鏁幫紝渚嬪 -1.8E-45銆?.567 |
String | 浠諱綍鐢卞崟寮曞彿鎴栧弻寮曞彿闄愬畾鐨勫瓧絎︿覆銆傚浜庡崟寮曞彿銆佸弻寮曞彿鍜屽弽鏂滄潬錛屼嬌鐢ㄥ弽鏂滄潬瀛楃浣滀負杞箟搴忓垪銆傚繀欏繪敞鎰忥紝濡傛灉鍦ㄥ瓧絎︿覆涓ょ浣跨敤鍙屽紩鍙鳳紝鍒欏崟寮曞彿涓嶉渶瑕佽漿涔夈?/p> |
| Null | null |
璁╂垜浠潵鐪嬩竴浜涗嬌鐢ㄦ枃瀛椾綔涓烘湁鏁堣〃杈懼紡鐨勭ず渚嬶細
${false} <%-- evaluates to false --%>
${3*8)鎿嶄綔絎?/h3>
JSP 琛ㄨ揪寮忚璦鎻愪緵浠ヤ笅鎿嶄綔絎︼紝鍏朵腑澶ч儴鍒嗘槸 Java 涓父鐢ㄧ殑鎿嶄綔絎︼細
| 鏈 | 瀹氫箟 |
|---|
綆楁湳鍨?/p> | +銆?錛堜簩鍏冿級銆?銆?銆乨iv銆?銆乵od銆?錛堜竴鍏冿級 |
閫昏緫鍨?/p> | and銆?amp;&銆乷r銆亅|銆?銆乶ot |
鍏崇郴鍨?/p> | ==銆乪q銆?=銆乶e銆?lt>銆乬t銆?lt;=銆乴e銆?gt;=銆乬e銆傚彲浠ヤ笌鍏朵粬鍊艱繘琛屾瘮杈冿紝鎴栦笌甯冨皵鍨嬨佸瓧絎︿覆鍨嬨佹暣鍨嬫垨嫻偣鍨嬫枃瀛楄繘琛屾瘮杈冦?/lt> |
絀?/p> | 絀烘搷浣滅鏄墠緙鎿嶄綔錛屽彲鐢ㄤ簬紜畾鍊兼槸鍚︿負絀恒?/p> |
| 鏉′歡鍨?/td> | A ?B :C銆傛牴鎹?A 璧嬪肩殑緇撴灉鏉ヨ祴鍊?B 鎴?C銆? |
璁╂垜浠潵鐪嬩竴浜涗嬌鐢ㄦ搷浣滅浣滀負鏈夋晥琛ㄨ揪寮忕殑紺轟緥錛?
${ (6 * 5) + 5 } <%-- evaluates to 35 --%>
${empty name}闅愬紡瀵硅薄
JSP 琛ㄨ揪寮忚璦瀹氫箟浜嗕竴緇勯殣寮忓璞★紝鍏朵腑璁稿瀵硅薄鍦?JSP scriplet 鍜岃〃杈懼紡涓彲鐢細
| 鏈 | 瀹氫箟 |
|---|
pageContext | JSP 欏電殑涓婁笅鏂囥傚畠鍙互鐢ㄤ簬璁塊棶 JSP 闅愬紡瀵硅薄錛屽璇鋒眰銆佸搷搴斻佷細璇濄佽緭鍑恒乻ervletContext 絳夈備緥濡傦紝${pageContext.response} 涓洪〉闈㈢殑鍝嶅簲瀵硅薄璧嬪箋?/p> |
姝ゅ錛岃繕鎻愪緵鍑犱釜闅愬紡瀵硅薄錛屽厑璁稿浠ヤ笅瀵硅薄榪涜綆鏄撹闂細
| 鏈 | 瀹氫箟 |
|---|
param | 灝嗚姹傚弬鏁板悕縐版槧灝勫埌鍗曚釜瀛楃涓插弬鏁板鹼紙閫氳繃璋冪敤
ServletRequest.getParameter (String name) 鑾峰緱錛夈俫etParameter (String)
鏂規(guī)硶榪斿洖甯︽湁鐗瑰畾鍚嶇О鐨勫弬鏁般傝〃杈懼紡 $(param.name) 鐩稿綋浜?request.getParameter (name)銆?/p> |
paramValues | 灝嗚姹傚弬鏁板悕縐版槧灝勫埌涓涓暟鍊兼暟緇勶紙閫氳繃璋冪敤 ServletRequest.getParameter
(String name) 鑾峰緱錛夈傚畠涓?param 闅愬紡瀵硅薄闈炲父綾諱技錛屼絾瀹冩绱竴涓瓧絎︿覆鏁扮粍鑰屼笉鏄崟涓箋傝〃杈懼紡
${paramvalues.name) 鐩稿綋浜?request.getParamterValues(name)銆?/p> |
header | 灝嗚姹傚ご鍚嶇О鏄犲皠鍒板崟涓瓧絎︿覆澶村鹼紙閫氳繃璋冪敤 ServletRequest.getHeader(String name) 鑾峰緱錛夈傝〃杈懼紡 ${header.name} 鐩稿綋浜?request.getHeader(name)銆?/p> |
headerValues | 灝嗚姹傚ご鍚嶇О鏄犲皠鍒頒竴涓暟鍊兼暟緇勶紙閫氳繃璋冪敤
ServletRequest.getHeaders(String) 鑾峰緱錛夈傚畠涓庡ご闅愬紡瀵硅薄闈炲父綾諱技銆傝〃杈懼紡
${headerValues.name} 鐩稿綋浜?request.getHeaderValues(name)銆?/p> |
| cookie | 灝?cookie 鍚嶇О鏄犲皠鍒板崟涓?cookie 瀵硅薄銆傚悜鏈嶅姟鍣ㄥ彂鍑虹殑瀹㈡埛绔姹傚彲浠ヨ幏寰椾竴涓垨澶氫釜
cookie銆傝〃杈懼紡 ${cookie.name.value} 榪斿洖甯︽湁鐗瑰畾鍚嶇О鐨勭涓涓?cookie 鍊箋傚鏋滆姹傚寘鍚涓悓鍚嶇殑
cookie錛屽垯搴旇浣跨敤 ${headerValues.name} 琛ㄨ揪寮忋?/td> |
| initParam | 灝嗕笂涓嬫枃鍒濆鍖栧弬鏁板悕縐版槧灝勫埌鍗曚釜鍊鹼紙閫氳繃璋冪敤 ServletContext.getInitparameter(String name) 鑾峰緱錛夈?
|
闄や簡涓婅堪涓ょ綾誨瀷鐨勯殣寮忓璞′箣澶栵紝榪樻湁浜涘璞″厑璁歌闂縐嶈寖鍥寸殑鍙橀噺錛屽 Web 涓婁笅鏂囥佷細璇濄佽姹傘侀〉闈細
| 鏈 | 瀹氫箟 |
|---|
pageScope | 灝嗛〉闈㈣寖鍥寸殑鍙橀噺鍚嶇О鏄犲皠鍒板叾鍊箋備緥濡傦紝EL 琛ㄨ揪寮忓彲浠ヤ嬌鐢?${pageScope.objectName} 璁塊棶涓涓?JSP 涓〉闈㈣寖鍥寸殑瀵硅薄錛岃繕鍙互浣跨敤 ${pageScope.objectName.attributeName} 璁塊棶瀵硅薄鐨勫睘鎬с?/p> |
requestScope | 灝嗚姹傝寖鍥寸殑鍙橀噺鍚嶇О鏄犲皠鍒板叾鍊箋傝瀵硅薄鍏佽璁塊棶璇鋒眰瀵硅薄鐨勫睘鎬с備緥濡傦紝EL 琛ㄨ揪寮忓彲浠ヤ嬌鐢?
${requestScope.objectName} 璁塊棶涓涓?JSP 璇鋒眰鑼冨洿鐨勫璞★紝榪樺彲浠ヤ嬌鐢?
${requestScope.objectName.attributeName} 璁塊棶瀵硅薄鐨勫睘鎬с?/p> |
sessionScope | 灝嗕細璇濊寖鍥寸殑鍙橀噺鍚嶇О鏄犲皠鍒板叾鍊箋傝瀵硅薄鍏佽璁塊棶浼氳瘽瀵硅薄鐨勫睘鎬с備緥濡傦細 <% session.put (name", "John Doe"); %>
$sessionScope.name} <%-- evaluates to John Doe --%>
<%= session.get("name"); %> <%-- This is an equivalent scripting expression --%> |
applicationScope | 灝嗗簲鐢ㄧ▼搴忚寖鍥寸殑鍙橀噺鍚嶇О鏄犲皠鍒板叾鍊箋傝闅愬紡瀵硅薄鍏佽璁塊棶搴旂敤紼嬪簭鑼冨洿鐨勫璞°?/p> |
蹇呴』娉ㄦ剰錛屽綋琛ㄨ揪寮忔牴鎹悕縐板紩鐢ㄨ繖浜涘璞′箣涓鏃訛紝榪斿洖鐨勬槸鐩稿簲鐨勫璞¤屼笉鏄浉搴旂殑灞炴с備緥濡傦細鍗充嬌鐜版湁鐨?pageContext 灞炴у寘鍚煇浜涘叾浠栧鹼紝${pageContext} 涔熻繑鍥?PageContext 瀵硅薄銆?
浣跨敤 EL 琛ㄨ揪寮?/h2>
EL 琛ㄨ揪寮忓彲鐢ㄤ簬涓ょ鎯呭喌錛?/p>
- 浣滀負鏍囧噯鎿嶄綔鍜岃嚜瀹氫箟鎿嶄綔涓殑灞炴у?br />
- 鍦?JSP 鏂囦歡鐨勬ā鏉挎枃鏈腑錛屽 HTML 鎴栭潪 JSP 鍏冪礌 鈥?鍦ㄨ繖縐嶆儏鍐典笅錛屾ā鏉挎枃鏈腑鐨勮〃杈懼紡琚祴鍊煎茍鎻掑叆鍒板綋鍓嶇殑杈撳嚭涓備絾鏄紝蹇呴』娉ㄦ剰錛屽鏋滄爣璁扮殑涓諱綋琚０鏄庝負涓庢爣璁扮浉鍏籌紝鍒欎笉浼氬琛ㄨ揪寮忚祴鍊箋?