javaweb瀛︿範鎬荤粨锛堝崄涓€锛夆€斺€旇嚜瀹氫箟鏍囩寮€鍙戝簱

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鏍囩锛?a href='http://www.mamicode.com/so/1/strong' title='strong'>strong   tld   set   commit   demo1   coding   1.0   榛樿   desc   

涓€銆佽嚜瀹氫箟鏍囩寮€鍙戝簱绠€浠嬶細

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銆€銆€Tag鎺ュ彛鐨勬柟娉曪細

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浜屻€佽嚜瀹氫箟鏍囩鍏ラ棬锛氳緭鍑哄鎴锋満ip

銆€銆€1.缂栧啓涓€涓疄鐜皌ag鎺ュ彛鐨刯ava绫?/span>

銆€銆€銆€銆€ViewIPTag.java

 1 package com.web.tag;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.http.HttpServletRequest;
 6 import javax.servlet.jsp.JspException;
 7 import javax.servlet.jsp.JspWriter;
 8 import javax.servlet.jsp.tagext.TagSupport;
 9 
10 //Tag鎺ュ彛瀹炵幇绫?/span>
11 public class ViewIPTag extends TagSupport{
12     @Override
13     public int doStartTag() throws JspException {
14     
15         HttpServletRequest request = (HttpServletRequest) this.pageContext.getRequest();
16         JspWriter out = this.pageContext.getOut();
17         
18         
19         String ip = request.getRemoteAddr();
20         try {
21             out.print(ip);
22         } catch (IOException e) {
23             throw new RuntimeException(e);
24         }
25         
26         return super.doStartTag();
27     }
28 }

 

 

 

銆€銆€銆€銆€

銆€銆€2.鍦╰ld鏂囦欢涓鏍囩澶勭悊鍣ㄧ被杩涜鎻忚堪锛坱ld鏂囦欢鐨勪綅缃?WEB-INF涓?鍙互鎶刟pache-tomcat/webappsexamplesWEB-INFjsp2jsp2-example-taglib.tld锛?/span>

銆€銆€銆€銆€com.tld:杩欎釜鏂囦欢鏀惧湪WEB-INF鐩綍涓?/span>

銆€銆€銆€銆€銆€銆€

 1 <taglib xmlns="http://java.sun.com/xml/ns/j2ee"
 2     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
 4     version="2.0">
 5     
 6     <description>A tag library exercising SimpleTag handlers.</description>
 7     <tlib-version>1.0</tlib-version>
 8     <short-name>com</short-name>
 9     <uri>http://www.sina.cn</uri><!-- 缁戝畾url -->
10     
11     
12     <tag>
13         <name>viewIP</name><!-- 鏍囩鐨勫悕绉?-->
14         <tag-class>com.web.tag.ViewIPTag</tag-class><!-- 鏍囩瀹炵幇绫荤殑瀹屾暣绫诲悕 -->
15         <body-content>empty</body-content><!-- 鏍囩浣撲负绌?-->
16     </tag>
17     
18 </taglib>

 

 

 

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銆€銆€3.鍦╦sp椤甸潰涓鍏ュ拰浣跨敤鑷畾涔夋爣绛?/span>

銆€銆€銆€銆€1.jsp

銆€銆€銆€銆€銆€銆€

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@taglib uri="http://www.sina.cn" prefix="com" %> <!-- 瀵煎叆鏍囩 -->
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     鎮ㄧ殑ip:<com:viewIP/><!-- 浣跨敤鏍囩 -->
11 </body>
12 </html>

 

 

 

涓夈€乀ag鎺ュ彛鐨勬墽琛屾祦绋?/strong>

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 銆€銆€

銆€銆€鑷畾涔夋爣绛捐皟鐢ㄥ浘锛?/span>

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銆€銆€

銆€銆€銆€jsp缈昏瘧鎴恠ervlet閮ㄥ垎婧愪唬鐮?

銆€銆€銆€銆€

 1    out.write("    鎮ㄧ殑ip鏄細");
 2       if (_jspx_meth_com_005fviewIP_005f0(_jspx_page_context))
 3         return;
 4       out.write("
");
 5       out.write("  </body>
");
 6       out.write("</html>
");
 7     } catch (java.lang.Throwable t) {
 8       if (!(t instanceof javax.servlet.jsp.SkipPageException)){
 9         out = _jspx_out;
10         if (out != null && out.getBufferSize() != 0)
11           try {
12             if (response.isCommitted()) {
13               out.flush();
14             } else {
15               out.clearBuffer();
16             }
17           } catch (java.io.IOException e) {}
18         if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
19         else throw new ServletException(t);
20       }
21     } finally {
22       _jspxFactory.releasePageContext(_jspx_page_context);
23     }
24   }
25 
26   private boolean _jspx_meth_com_005fviewIP_005f0(javax.servlet.jsp.PageContext _jspx_page_context)
27           throws java.lang.Throwable {
28     javax.servlet.jsp.PageContext pageContext = _jspx_page_context;
29     javax.servlet.jsp.JspWriter out = _jspx_page_context.getOut();
30     //  com:viewIP
31     com.web.tag.ViewIPTag _jspx_th_com_005fviewIP_005f0 = (com.web.tag.ViewIPTag) _005fjspx_005ftagPool_005fcom_005fviewIP_005fnobody.get(com.web.tag.ViewIPTag.class);
32     boolean _jspx_th_com_005fviewIP_005f0_reused = false;
33     try {
34       _jspx_th_com_005fviewIP_005f0.setPageContext(_jspx_page_context);//璋冪敤setPageContext()鏂规硶
35 _jspx_th_com_005fviewIP_005f0.setParent(null); 36 int _jspx_eval_com_005fviewIP_005f0 = _jspx_th_com_005fviewIP_005f0.doStartTag(); 37 if (_jspx_th_com_005fviewIP_005f0.doEndTag() == javax.servlet.jsp.tagext.Tag.SKIP_PAGE) { 38 return true; 39  } 40  _005fjspx_005ftagPool_005fcom_005fviewIP_005fnobody.reuse(_jspx_th_com_005fviewIP_005f0); 41 _jspx_th_com_005fviewIP_005f0_reused = true; 42 } finally { 43  org.apache.jasper.runtime.JspRuntimeLibrary.releaseTag(_jspx_th_com_005fviewIP_005f0, _jsp_getInstanceManager(), _jspx_th_com_005fviewIP_005f0_reused); 44  } 45 return false; 46 }

 

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鍥涖€?浼犵粺鏍囩寮€鍙戞妧鏈?/span>

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銆€銆€銆€銆€API:
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銆€銆€銆€銆€銆€TagDemo1.java:

 1 package com.web.tag;
 2 
 3 import javax.servlet.jsp.JspException;
 4 import javax.servlet.jsp.tagext.TagSupport;
 5 
 6 public class TagDemo1 extends TagSupport{
 7 
 8     @Override
 9     public int doStartTag() throws JspException {
10         
11         //瀹為檯寮€鍙戝満鏅€斺€斺€斺€斿鏋滄湁鏉冮檺鍒欒緭鍑猴紝娌℃湁鏉冮檺鍒欎笉杈撳嚭
12         return TagSupport.EVAL_BODY_INCLUDE;
13     }
14     
15 }

 

 

 銆€銆€

銆€銆€鏍囩澹版槑锛?/span>

銆€銆€銆€銆€

1  <tag>
2         <name>demo1</name>
3         <tag-class>com.web.tag.TagDemo1</tag-class>
4         <body-content>JSP</body-content><!--鏍囩浣撶殑鍐呭   empty JSP scriptless tagdepentend-->
5     </tag>
6

 

 銆€銆€tld鏂囦欢绫诲瀷涓殑鍥涚鏍囩浣?EMPTY JSP scriptless tagdepentend

銆€銆€

銆€銆€jsp:

銆€銆€銆€銆€

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@taglib uri="http://www.sina.cn" prefix="com" %>
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     <title>浣跨敤鑷畾涔夋爣绛炬帶鍒秊sp閮ㄥ垎鍐呭鏄惁杈撳嚭锛堟爣绛句綋锛?span style="color: #0000ff"></title>
 7   </head>
 8       <com:demo1>hahaha</com:demo1>
 9   <body>
10     
11   </body>
12 </html>

 

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銆€銆€2銆佹帶鍒舵暣涓猨sp椤甸潰鍐呭鏄惁鎵ц

銆€銆€銆€銆€API:
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 銆€銆€銆€銆€TagDemo2.java:

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銆€銆€

 銆€銆€銆€銆€鏍囩澹版槑锛?/span>

1 <tag>
2         <name>demo2</name>
3         <tag-class>com.web.tag.TagDemo2</tag-class>
4         <body-content>empty</body-content><!--鏍囩浣撲负绌?->
5     </tag>
6

 

 

 

 

銆€銆€銆€銆€浣跨敤鏍囩锛?/span>

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銆€銆€3銆佹帶鍒舵爣绛句綋閲嶅杈撳嚭

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 銆€銆€銆€鏍囩瀹炵幇绫伙細銆€

 1 package com.web.tag;
 2 
 3 import javax.servlet.jsp.JspException;
 4 import javax.servlet.jsp.tagext.IterationTag;
 5 import javax.servlet.jsp.tagext.Tag;
 6 import javax.servlet.jsp.tagext.TagSupport;
 7 //鎺у埗鏍囩浣撹緭鍑?娆?/span>
 8 public class TagDemo3 extends TagSupport{
 9     //娆℃暟
10     int x = 5;
11     @Override
12     public int doStartTag() throws JspException {
13         return Tag.EVAL_BODY_INCLUDE;
14     }
15 
16     @Override
17     //鍦ㄦ爣绛句綋鎵ц瀹屼箣鍚庛€佺粨鏉熸爣绛句箣鍓嶈皟鐢?/span>
18     public int doAfterBody() throws JspException {
19         x--;
20         if(x>0){
21             return IterationTag.EVAL_BODY_AGAIN;
22         }else {
23             return IterationTag.SKIP_PAGE;
24         }
25     }
26 }

 

 

 銆€銆€銆€銆€

銆€銆€銆€銆€鏍囩澹版槑锛?/span>

1   <tag>
2         <name>demo3</name>
3         <tag-class>com.web.tag.TagDemo3</tag-class>
4         <body-content>JSP</body-content>
5     </tag>

 

 銆€銆€銆€銆€

銆€銆€銆€銆€浣跨敤鏍囩锛?/span>

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@taglib uri="http://www.sina.cn" prefix="com" %>
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     <title>浣跨敤鑷畾涔夋爣绛炬帶鍒秊sp閮ㄥ垎鍐呭鏄惁杈撳嚭锛堟爣绛句綋锛?span style="color: #0000ff"></title>
 7   </head>
 8   <body>
 9     <com:demo3>鎺у埗鏍囩浣撻噸澶嶈緭鍑?<br/></com:demo3>
10   </body>
11 </html>

 

 銆€銆€銆€銆€

 

銆€銆€銆€4銆佹敼鍙樻爣绛句綋鍐呭杈撳嚭

銆€銆€銆€銆€銆€API锛?br>

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 銆€銆€銆€銆€鏍囩瀹炵幇绫伙細
銆€銆€銆€銆€銆€銆€TagDemo4.java:銆€銆€銆€銆€銆€

 1 package com.web.tag;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.jsp.JspException;
 6 import javax.servlet.jsp.tagext.BodyContent;
 7 import javax.servlet.jsp.tagext.BodyTag;
 8 import javax.servlet.jsp.tagext.BodyTagSupport;
 9 import javax.servlet.jsp.tagext.Tag;
10 
11 //淇敼鏍囩浣撳唴瀹硅緭鍑?/span>
12 public class TagDemo4 extends BodyTagSupport{
13     
14     @Override
15     public int doStartTag() throws JspException {
16         return BodyTag.EVAL_BODY_BUFFERED;//杩斿洖杩欎釜鍙傛暟锛屾湇鍔″櫒浼氭妸鏍囩浣撳皝瑁呮垚瀵硅薄浣滀负鍙傛暟璋冪敤setBodyContent(BodyContent b)鏂规硶
17     }
18     @Override
19     public int doEndTag() throws JspException {
20         //寰楀埌鏍囩浣?/span>
21         BodyContent bc = this.getBodyContent();
22         //寰楀埌鍐呭
23         String content = bc.getString();
24         //杞垚澶у啓
25         content = content.toUpperCase();
26         
27         try {
28             this.pageContext.getOut().write(content);
29         } catch (IOException e) {
30             throw new RuntimeException(e);
31         }
32         
33         return Tag.EVAL_PAGE;//缁х画杈撳嚭jsp椤甸潰鍏朵粬鍐呭
34     }
35 }

 

 

 

褰撳湪doStartTag()鏂规硶涓繑鍥濨odyTag.EVAL_BODY_BUFFERED鍙傛暟鏃讹紝鏈嶅姟鍣ㄤ細鎶婃爣绛句綋鍐呭灏佽鎴愬璞′綔涓哄弬鏁拌皟鐢╯etBodyContent(BodyContent b)鏂规硶锛岀劧鍚庡湪doEngTag锛堬級

涓皟鐢╣etBodyContent锛堬級鏂规硶杩斿洖BodyContent瀵硅薄锛屼粠鑰屽緱鍒版爣绛句綋鍐呭杩涜淇敼杈撳嚭銆?/span>

 

 

 

銆€銆€銆€銆€鏍囩澹版槑锛氥€€銆€

1 <tag>
2         <name>demo4</name>
3         <tag-class>com.web.tag.TagDemo4</tag-class>
4         <body-content>JSP</body-content>
5     </tag>
6

 

銆€銆€銆€銆€

銆€銆€銆€銆€浣跨敤鏍囩锛?/span>

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@taglib uri="http://www.sina.cn" prefix="com" %>
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     <title>浣跨敤鑷畾涔夋爣绛炬帶鍒秊sp閮ㄥ垎鍐呭鏄惁杈撳嚭锛堟爣绛句綋锛?span style="color: #0000ff"></title>
 7   </head>
 8       <com:demo4>aaaaaa</com:demo4>
 9   <body>
10     
11   </body>
12 </html>

 

 

銆€銆€銆€銆€5銆乀ag鎺ュ彛鐨勪綋绯伙細

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浜斻€佺畝鍗曟爣绛惧紑鍙戞妧鏈?/span>

銆€銆€鐢变簬浼犵粺鏍囩浣跨敤涓変釜鏍囩鎺ュ彛鏉ュ畬鎴愪笉鍚岀殑鍔熻兘锛屾樉寰楄繃浜庣箒鐞愶紝涓嶅埄浜庢爣绛炬妧鏈殑鎺ㄥ箍锛?SUN鍏徃涓洪檷浣庢爣绛炬妧鏈殑瀛︿範闅惧害锛屽湪JSP 2.0涓畾涔変簡涓€涓洿涓虹畝鍗曘€佷究浜庣紪鍐欏拰璋冪敤鐨凷impleTag鎺ュ彛鏉ュ疄鐜版爣绛剧殑鍔熻兘銆傚疄鐜癝impleTag鎺ュ彛鐨勬爣绛鹃€氬父绉颁负绠€鍗曟爣绛俱€傜畝鍗曟爣绛惧叡瀹氫箟浜?涓柟娉曪細

  • setJspContext鏂规硶
  • setParent鍜実etParent鏂规硶
  • setJspBody鏂规硶
  • doTag鏂规硶

 

銆€銆€API锛?/span>

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銆€銆€銆€銆€銆€銆€瀹炵幇绫伙細

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銆€銆€銆€1銆佹帶鍒舵爣绛句綋鏄惁鎵ц

銆€銆€銆€銆€鏍囩瀹炵幇绫伙細

銆€銆€銆€銆€銆€銆€SimpleTagDemo1.java:銆€銆€銆€銆€銆€

 1 import javax.servlet.jsp.JspException;
 2 import javax.servlet.jsp.tagext.JspFragment;
 3 import javax.servlet.jsp.tagext.SimpleTagSupport;
 4 //鎺у埗鏍囩浣撴槸鍚︽墽琛?/span>
 5 public class SimpleTagDemo1 extends SimpleTagSupport{
 6 
 7     @Override
 8     public void doTag() throws JspException, IOException {
 9         //鑾峰彇鏍囩浣撳璞?/span>
10         JspFragment jf = this.getJspBody();
11         for(int i=0;i<5;i++){
12             //鎵ц浜旀锛屽鏋滀笉鎵ц锛屽垯浠€涔堥兘涓嶅啓灏卞彲浠?/span>
13             jf.invoke(this.getJspContext().getOut());//null涔熷彲浠ラ粯璁よ緭鍑虹粰娴忚鍣?/span>
14         }
15         
16     }
17 }

 

 銆€銆€銆€鏍囩澹版槑:

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 
 3 <taglib xmlns="http://java.sun.com/xml/ns/j2ee"
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 5     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
 6     version="2.0">
 7     
 8     <description>A tag library exercising SimpleTag handlers.</description>
 9     <tlib-version>1.0</tlib-version>
10     <short-name>simple</short-name>
11     <uri>/simpletag</uri>
12     
13     
14     <tag>
15         <name>demo1</name>
16         <tag-class>com.web.simpletag.SimpleTagDemo1</tag-class>
17         <body-content>scriptless</body-content><!-- jsp2.0涔嬪悗涓嶈繍琛屾爣绛句綋閲岄潰鍐欒剼鏈唬鐮侊紝鎵€浠ョ敤scriptless -->
18     </tag>
19   
20 </taglib>

 

銆€銆€銆€銆€浣跨敤鏍囩锛氥€€銆€

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@taglib uri="/simpletag" prefix="simple" %>
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     <title>My JSP 鈥?.jsp鈥?starting page</title>
 7   </head>
 8   
 9   <body>
10        <simple:demo1>hahaha <br/></simple:demo1>
11   </body>
12 </html>

 

銆€銆€

銆€銆€銆€銆€




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