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【范例】赵雅智_简单标签实例

热度：390   发布时间：2012-11-23 00:03:43.0
【实例】赵雅智_简单标签实例

使用标签控制页面逻辑案例：

开发<c:if>标签
1.java类：IfDemoTag.java
package com.hbsi.copyTag;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

import sun.java2d.pipe.SpanShapeRenderer.Simple;

public class IfDemoTag extends SimpleTagSupport {

	private boolean test;

	public void setTest(boolean test) {
		this.test = test;
	}

	@Override
	public void doTag() throws JspException, IOException {
		if(test){
			this.getJspBody().invoke(null);
		}
	}
	
	
}


2.jsp文件：ifDemo.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/copy" prefix="c" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>模仿sun公司的c:if标签</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  <c:if test="${user==null}">
     This is my JSP page. <br>
  </c:if>
  </body>
</html>


3.lib文件：c.lib
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
    <description>A tag library exercising SimpleTag handlers.</description>
    <tlib-version>1.0</tlib-version>
    <short-name>c</short-name>
    <uri>/copy</uri>
    
    <tag>
	 <name>if</name>
	<tag-class>com.hbsi.copyTag.IfDemoTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
</taglib>


第二种情况：
jsp文件：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/copy" prefix="c" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>模仿sun公司的c:if标签</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  <c:if test="${user!=null}">
     This is my JSP page. <br>
  </c:if>
  </body>
</html>



开发<c:if><c:else>标签
1.java类：
ChooseTag.java
package com.hbsi.copyTag;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class ChooseTag extends SimpleTagSupport {

	private boolean isOK;

	public void setOK(boolean isOK) {
		this.isOK = isOK;
	}

	public boolean isOK() {
		return isOK;
	}

	@Override
	public void doTag() throws JspException, IOException {
		this.getJspBody().invoke(null);
	}
	
	
}


WhenTag.java
package com.hbsi.copyTag;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class WhenTag extends SimpleTagSupport {
	private boolean test;

	public void setTest(boolean test) {
		this.test = test;
	}

	@Override
	public void doTag() throws JspException, IOException {
		ChooseTag parent = (ChooseTag) this.getParent();
		if(test && !parent.isOK()){
			this.getJspBody().invoke(null);
			parent.setOK(true);
		}
	}
	
	

}

OtherWiseTag.java
package com.hbsi.copyTag;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class OtherWiseTag extends SimpleTagSupport {

	@Override
	public void doTag() throws JspException, IOException {
		ChooseTag parent = (ChooseTag) this.getParent();
		
		if(!parent.isOK()){
			this.getJspBody().invoke(null);
			parent.setOK(true);
		}
	}
}


2.jsp文件：
choose.java
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/copy" prefix="c" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>My JSP 'choose.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  <c:choose>
  <c:when test="<%=true %>">aaaa</c:when>
  <c:othewise>vvvv</c:othewise>
  
  </c:choose>
    
  </body>
</html>


3.lib文件：
c.lib
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
    <description>A tag library exercising SimpleTag handlers.</description>
    <tlib-version>1.0</tlib-version>
    <short-name>c</short-name>
    <uri>/copy</uri>
    
    <tag>
	 <name>if</name>
	<tag-class>com.hbsi.copyTag.IfDemoTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
     <tag>
	 <name>choose</name>
	<tag-class>com.hbsi.copyTag.ChooseTag</tag-class>
	<body-content>scriptless</body-content>
    </tag> 
    
     <tag>
	 <name>when</name>
	<tag-class>com.hbsi.copyTag.WhenTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
     <tag>
	 <name>othewise</name>
	<tag-class>com.hbsi.copyTag.OtherWiseTag</tag-class>
	<body-content>scriptless</body-content>
    </tag> 
    
</taglib>


另一种情况：
jsp文件
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/copy" prefix="c" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>My JSP 'choose.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  <c:choose>
  <c:when test="<%=false %>">aaaa</c:when>
  <c:othewise>vvvv</c:othewise>
  
  </c:choose>
    
  </body>
</html>



开发列表遍历标签
1.java类：
ForEachTag.java
package com.hbsi.copyTag;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class ForEachTag extends SimpleTagSupport {
	private String var;
	private List items;
	public void setVar(String var) {
		this.var = var;
	}

	public void setItems(List items) {
		this.items = items;
	}

	@Override
	public void doTag() throws JspException, IOException {
		Iterator it = items.iterator();
		while(it.hasNext()){
			Object obj = it.next();
			//放到域里去,取出来的一个对象放到var属性里
			this.getJspContext().setAttribute(var, obj);
			//执行标签体的内容
			this.getJspBody().invoke(null);
		}
	}

	

}

2.jsp文件：
forEach.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/copy" prefix="c" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>forEach</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  <%
      List list = new ArrayList();
      list.add("aaa");
      list.add("bbb");
      list.add("ccc");
      list.add("ddd");
      request.setAttribute("list",list);
   %>
   <c:forEach items="${list}" var="str">${str}</c:forEach>
  </body>
</html>


3.lib文件：
c.jsp
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
    <description>A tag library exercising SimpleTag handlers.</description>
    <tlib-version>1.0</tlib-version>
    <short-name>c</short-name>
    <uri>/copy</uri>
    
    <tag>
	 <name>if</name>
	<tag-class>com.hbsi.copyTag.IfDemoTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
     <tag>
	 <name>choose</name>
	<tag-class>com.hbsi.copyTag.ChooseTag</tag-class>
	<body-content>scriptless</body-content>
    </tag> 
    
     <tag>
	 <name>when</name>
	<tag-class>com.hbsi.copyTag.WhenTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
     <tag>
	 <name>othewise</name>
	<tag-class>com.hbsi.copyTag.OtherWiseTag</tag-class>
	<body-content>scriptless</body-content>
    </tag> 
    
    <tag>
	 <name>forEach</name>
	<tag-class>com.hbsi.copyTag.ForEachTag</tag-class>
	<body-content>scriptless</body-content>
	<attribute>
	    <name>var</name>
	    <required>true</required>
	</attribute>
	<attribute>
	    <name>items</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
	</tag>
</taglib>


开发迭代标签
1.java类：
ForEachAllTag.java
package com.hbsi.copyTag;


import java.io.IOException;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;


import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;


public class ForEachAllTag extends SimpleTagSupport {
	// 标签处理类里的变量,不管传什么都转成Collectiion类型
	private Collection collection;
	// var和items是标签属性里要用到的属性变量
	private String var;
	// 迭代所有集合（map,list,a[]）,用object
	private Object items;


	public void setVar(String var) {
		this.var = var;
	}
	// 执行到标签，给标签赋值的时候，jsp引擎会调用set方法
	public void setItems(Object items) {
		this.items = items;
		
		if(items instanceof Map){
			//items对象转成map
			Map map = (Map) items;
			//多态，返回set对象
			collection = map.entrySet();
			
		}
		if(items instanceof Collection){  //set list
			collection = (Collection) items;
		}
		//这么判断不行，数组只能取到类类型，取不到一般数据类型
		// if (items instanceof Object) {}
		if(items.getClass().isArray()){
			//取到集合赋给list
			collection = new ArrayList();
			int len = Array.getLength(items);
			for(int i=0;i<len;i++){
				Object obj = Array.get(items,i);
				collection.add(obj);
			}
			
		}
	}
	@Override
	public void doTag() throws JspException, IOException {
		Iterator it = collection.iterator();
		while(it.hasNext()){
			Object obj = it.next();
			this.getJspContext().setAttribute(var, obj);
			this.getJspBody().invoke(null);
		}
		
	}
}


2.jsp文件：
forEachAll.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/copy" prefix="c" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>遍历所有集合标签</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head>
  <body>
  
  <%
      List list = new ArrayList();
      list.add("aaa");
      list.add("bbb");
      list.add("ccc");
      list.add("ddd");
      request.setAttribute("list",list);
   %>
   <c:forEachAll var="str" items="${list}">${str}</c:forEachAll>
   <br/>
   <br/>
   <%
      Map map = new HashMap();
      map.put("aa","aaa");
      map.put("bb","bbb");
      map.put("cc","ccc");
      map.put("dd","ddd");
      request.setAttribute("map",map);
    %>
    <c:forEachAll items="${map}" var="str">${str.key}-----${str.value}<br></c:forEachAll>
   <br/>
   <br/>
   
   <%
       String strs[] = {"aaa","bbb","ccc"};
       request.setAttribute("strs",strs);  
   %>
   <c:forEachAll items="${strs}" var="str">${str}<br></c:forEachAll>
   <br/>
   <br/>
   
      <%
       int i[] = {1,2,3};
       request.setAttribute("i",i);  
   %>
   <c:forEachAll items="${i}" var="num">${num}<br></c:forEachAll>
   <br/>
   <br/>
   
  </body>
</html>


3.lib文件：
c.lib
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
    <description>A tag library exercising SimpleTag handlers.</description>
    <tlib-version>1.0</tlib-version>
    <short-name>c</short-name>
    <uri>/copy</uri>
    
    <tag>
	 <name>if</name>
	<tag-class>com.hbsi.copyTag.IfDemoTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
     <tag>
	 <name>choose</name>
	<tag-class>com.hbsi.copyTag.ChooseTag</tag-class>
	<body-content>scriptless</body-content>
    </tag> 
    
     <tag>
	 <name>when</name>
	<tag-class>com.hbsi.copyTag.WhenTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
     <tag>
	 <name>othewise</name>
	<tag-class>com.hbsi.copyTag.OtherWiseTag</tag-class>
	<body-content>scriptless</body-content>
    </tag> 
    
    <tag>
	 <name>forEach</name>
	<tag-class>com.hbsi.copyTag.ForEachTag</tag-class>
	<body-content>scriptless</body-content>
	<attribute>
	    <name>var</name>
	    <required>true</required>
	</attribute>
	<attribute>
	    <name>items</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
	</tag>
	
	<tag>
	<name>forEachAll</name>
	<tag-class>com.hbsi.copyTag.ForEachAllTag</tag-class>
	<body-content>scriptless</body-content>
	<attribute>
	    <name>var</name>
	    <required>true</required>
	</attribute>
	<attribute>
	    <name>items</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
	</tag>
	
</taglib>


开发html转义标签
1.java类：
HTMLFilter.java
package com.hbsi.copyTag;

import java.io.IOException;
import java.io.StringWriter;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.JspFragment;
import javax.servlet.jsp.tagext.SimpleTagSupport;

import com.sun.net.httpserver.Filter;

public class HTMLFilterTag extends SimpleTagSupport {

	@Override
	public void doTag() throws JspException, IOException {
		JspFragment jf = this.getJspBody();
		StringWriter sw = new StringWriter();
		jf.invoke(sw);
		String s = sw.toString();
		s = filter(s);
		this.getJspContext().getOut().write(s);
		
	}

	  public static String filter(String message) {

	        if (message == null)
	            return (null);

	        char content[] = new char[message.length()];
	        message.getChars(0, message.length(), content, 0);
	        StringBuffer result = new StringBuffer(content.length + 50);
	        for (int i = 0; i < content.length; i++) {
	            switch (content[i]) {
	            case '<':
	                result.append("<");
	                break;
	            case '>':
	                result.append(">");
	                break;
	            case '&':
	                result.append("&");
	                break;
	            case '"':
	                result.append(""");
	                break;
	            default:
	                result.append(content[i]);
	            }
	        }
	        return (result.toString());

	    }
}


2.jsp文件：
htmlFilter.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/copy" prefix="c" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>文本输出</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head>
  <body>   
   <c:htmlfilter>
      <a href="">aaa</a>
   </c:htmlfilter>
  
  </body>
</html>


3.lib文件：
c.lib
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
    <description>A tag library exercising SimpleTag handlers.</description>
    <tlib-version>1.0</tlib-version>
    <short-name>c</short-name>
    <uri>/copy</uri>
    
    <tag>
	 <name>if</name>
	<tag-class>com.hbsi.copyTag.IfDemoTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
     <tag>
	 <name>choose</name>
	<tag-class>com.hbsi.copyTag.ChooseTag</tag-class>
	<body-content>scriptless</body-content>
    </tag> 
    
     <tag>
	 <name>when</name>
	<tag-class>com.hbsi.copyTag.WhenTag</tag-class>
	<body-content>scriptless</body-content>
		<attribute>
	    <name>test</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
    </tag> 
    
     <tag>
	 <name>othewise</name>
	<tag-class>com.hbsi.copyTag.OtherWiseTag</tag-class>
	<body-content>scriptless</body-content>
    </tag> 
    
    <tag>
	 <name>forEach</name>
	<tag-class>com.hbsi.copyTag.ForEachTag</tag-class>
	<body-content>scriptless</body-content>
	<attribute>
	    <name>var</name>
	    <required>true</required>
	</attribute>
	<attribute>
	    <name>items</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
	</tag>
	
	<tag>
	<name>forEachAll</name>
	<tag-class>com.hbsi.copyTag.ForEachAllTag</tag-class>
	<body-content>scriptless</body-content>
	<attribute>
	    <name>var</name>
	    <required>true</required>
	</attribute>
	<attribute>
	    <name>items</name>
	    <required>true</required>
	    <rtexprvalue>true</rtexprvalue>
	</attribute>
	</tag>
	
	<tag>
	 <name>htmlfilter</name>
	<tag-class>com.hbsi.copyTag.HTMLFilterTag</tag-class>
	<body-content>scriptless</body-content>
	</tag>
</taglib>



不使用标签：
jsp文件:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/copy" prefix="c" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>文本输出</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head>
  <body>   
      <a href="">aaa</a>
  
  </body>
</html>


打包标签库

1.新建java项目


2.把要打包的文件考到java项目里

3.考tld文件

项目下新建文件夹MATE-INF

Tld文件拷到此文件夹下

4.新建lib文件夹，导入web所需的包

5.添加path路径


6.java项目右键导出

                                          

                                                        

                  

                                                               



新建一个WEB项目测试


复制jar包考到lib下

编写一个jsp文件

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://www.hbsi.com" prefix="c" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>测试JAR包</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
  <c:htmlfilter>
  <a href="">This is my JSP page.</a> <br>
  </c:htmlfilter>
    <br>
  </body>
</html>



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