StringBuffer sb = new StringBuffer();
sb.append("xx");

  boolean beginRender(MarkupWriter writer)
  {
     writer.element("img",
                    "src", src);

     resources.renderInformalParameters(writer);

     writer.end();

     return false;
  }

package com.m3958.tcms.components;

import java.util.ArrayList;
import java.util.Collections;

import org.apache.tapestry5.Link;
import org.apache.tapestry5.annotations.Parameter;
import org.apache.tapestry5.annotations.SetupRender;

import com.m3958.tcms.base.MyComponentBase;
import com.m3958.tcms.data.SectionNodeVo;
import com.m3958.tcms.utils.MyString;

public class BreadCrumb extends MyComponentBase{

	private int index;
	
	
	private ArrayList<SectionNodeVo> breadCrumb;
	
	public ArrayList<SectionNodeVo> getBreadCrumb() {
		return breadCrumb;
	}

	public void setBreadCrumb(ArrayList<SectionNodeVo> breadCrumb) {
		this.breadCrumb = breadCrumb;
	}

	private SectionNodeVo breadCrumbItem;
	
	
	public boolean isLast(){
		if(breadCrumb.size()  > index + 1){
			return false;
		}else{
			return true;
		}
	}
	
	@Parameter(required=true)
	private SectionNodeVo myCurSection;
	
	@Parameter
	private String returnPage;
	
	
	Object onActionFromCd(String sectionId){
		
		if(getLoginUser().isSuperman() || getLoginUser().isSitemanager()){
			Link link = null;
			if(MyString.isEmpty(returnPage)){
				 link = getPrl().createPageRenderLinkWithContext(getResource().getPage().getClass(), sectionId);
			}else{
				link = getPrl().createPageRenderLinkWithContext(returnPage, sectionId);
			}
			return link;

		}
		
		SectionNodeVo snv = getSitevoByManagingSite().findSectionNodevo(sectionId);
		int depth = 10;
		while(snv != null && depth > 0){
			depth--;
			if(getLoginUser().getSections().contains(snv.getId())){
				Link link = null;
				if(MyString.isEmpty(returnPage)){
					 link = getPrl().createPageRenderLinkWithContext(getResource().getPage().getClass(), sectionId);
				}else{
					link = getPrl().createPageRenderLinkWithContext(returnPage, sectionId);
				}
				return link;

			}
			snv = snv.getParent();
		}
		return null;
	}
	
	Object onActionFromMd(String sectionId){
		
		String sectionType = MyString.splitAndGet(myCurSection.getDtype(), "\\.", -1);
		
		Link link = getPrl().createPageRenderLinkWithContext("section/" + sectionType + "Create", sectionId);
		return link;
	

	}
	
	
	
	@SetupRender
	void initialize(){
		SectionNodeVo svo = getMyCurSection();
		breadCrumb = new ArrayList<SectionNodeVo>();
		while(svo != null){
			breadCrumb.add(svo);
			svo = svo.getParent();
		}
		Collections.reverse(breadCrumb);
	}

	public void setIndex(int index) {
		this.index = index;
	}

	public int getIndex() {
		return index;
	}

	public void setBreadCrumbItem(SectionNodeVo breadCrumbItem) {
		this.breadCrumbItem = breadCrumbItem;
	}

	public SectionNodeVo getBreadCrumbItem() {
		return breadCrumbItem;
	}

	public void setMyCurSection(SectionNodeVo myCurSection) {
		this.myCurSection = myCurSection;
	}

	public SectionNodeVo getMyCurSection() {
		return myCurSection;
	}

}

<div   xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd">
	<t:loop source="breadCrumb" value="breadCrumbItem" index="index">
		<a href="#" t:type="actionlink" t:id="cd" context="breadCrumbItem.id">${breadCrumbItem.name}(${breadCrumbItem.dtypeName})</a>
		<t:unless test="last">
			>> 
		</t:unless>
	</t:loop>
	<a href="#" t:type="actionlink" t:id="md" t:context="MyCurSection.id"><img src="${asset:context:images/newfolder.gif}" alt="新建目录" title="新建目录"/></a><br/>
	
	
</div>

<span t:type="breadCrumb" t:myCurSection="curSection"></span>

<div t:type="breadCrumb" myCurSection="curSection" returnPage="literal:section/mySectionIndex"></div>

<div t:type="breadCrumb" myCurSection="curSection" returnPage="literal:section/mySectionIndex"></div>

<a href="#" t:type="eventlink" t:event="vote"></a>

	Object onVote() throws ServiceLocatorException, NamingException, SectionNodeVoNotFoundException{
		JSONObject jso = new JSONObject();
		
		String[] pollitems = getRequest().getParameters("pollitems");
		if(pollitems == null){
			jso.put("msg", "toolittle");
			Link link = getPrl().createPageRenderLink(getResource().getPageName());
			jso.put("next", link.toAbsoluteURI());
			return jso;
		}
		SectionNodeVo snv = getSitevo().findSectionNodeVoWithReadableId(pollName);
		
		minChoice = snv.getMinItem();
		maxChoice = snv.getMaxItem();
		if(maxChoice == 0) maxChoice = 1;
		if(minChoice == 0) minChoice = 1;
		
		if(pollitems.length > maxChoice){
			jso.put("msg", "toomuch");
			Link link = getPrl().createPageRenderLink(getResource().getPageName());
			jso.put("next", link.toAbsoluteURI());
			return jso;
		}
		
		String voteid = MyString.getRandomUUID();
		String ip = rg.getHTTPServletRequest().getRemoteAddr();
		for (int i = 0; i < pollitems.length; i++) {
			Vote v = new Vote();
			v.setTitle(voteid);
			v.setAuthorIp(ip);
			v.setCreatedAt(new Date());
			getContentsLocal().addVote(v, pollitems[i]);
		}
		jso.put("msg", "success");
		if(nextPage != null && (nextPage.startsWith("http://") || nextPage.startsWith("/"))){
			jso.put("next", nextPage);
		}else{
			if(MyString.isEmpty(nextPage)){
				Link link = getPrl().createPageRenderLink(getResource().getPageName());
				jso.put("next", link.toAbsoluteURI());
			}else{
				Link link = getPrl().createPageRenderLink(nextPage);
				jso.put("next", link.toAbsoluteURI());
			}
			
		}
		return jso;
	}

<form action="/${formActionUrl}" method="post" id="pollform">
		<t:loop source="polls" value="poll" index="index">        
        	<input type="checkbox" id="checkb${index}" name="pollitems" value="${poll.id}"/> ${poll.name}<br/>
        </t:loop>
       
        <input type="submit" id="submitpoll"/>

</form>

<script type="text/javascript">

YAHOO.simplepoll.choice_num = 0;
YAHOO.simplepoll.maxChoice = ${maxChoice};
YAHOO.simplepoll.minChoice = ${minChoice};
//
//<!--
//
	var handleSuccess = function(o){
		if(o.responseText !== undefined){
			var x = o.responseText;
			YAHOO.log(o.responseText,"info");
			try{
			 	var result = YAHOO.lang.JSON.parse(o.responseText);
			}catch(e){
				alert(o.responseText,"info");
				return;
			} 
			if(result.msg == "toolittle"){
				alert("您选择太少了！");
			}else if(result.msg = "success"){
				alert("感谢您的参与");
			}else if(result.msg = "toomuch"){
				alert("您选择太多了");
			}
			window.location = result.next;
		}
	};
	
	var handleFailure = function(o){
		alert("与服务器的通讯可能有问题。");
	};

	var callback =
	{
	  success:handleSuccess,
	  failure:handleFailure,
	  argument:['foo','bar']
	};

//var sUrl = "polltest.simplepoll.pollform";




function makeRequest(e){
	YAHOO.util.Event.preventDefault(e);
	var formele = new YAHOO.util.Element('pollform');
	
	var checkboxes = formele.getElementsByTagName('input');

	var i =0;
	YAHOO.simplepoll.choice_num = 0;
	for(i=0;i<checkboxes.length;i++){
		var ele = new YAHOO.util.Element(checkboxes[i]);
 		YAHOO.log(ele.get('type'),"info");
		if(ele.get('type') == "checkbox"){
			if(ele.get('checked')){
				YAHOO.simplepoll.choice_num++;
			}
		}
	}
	YAHOO.log(formele.get('action'),"info");

	if(YAHOO.simplepoll.choice_num < YAHOO.simplepoll.minChoice){
		alert("至少选择" + YAHOO.simplepoll.minChoice + "个");
		return;
	}

	if(YAHOO.simplepoll.choice_num > YAHOO.simplepoll.maxChoice){
		alert("最多选择" + YAHOO.simplepoll.minChoice + "个");
		return;
	}		
	var formObject = document.getElementById('pollform'); 
	YAHOO.util.Connect.setForm(formObject); 
	var request = YAHOO.util.Connect.asyncRequest('POST', formele.get('action'), callback);
}

//
//-->
//
</script>
		
		 
       <script type="text/javascript">
    //
    //<!-- //
    
    function checkboxClickHandler(e) {
    	//get the resolved (non-text node) target:
    	var elTarget = YAHOO.util.Event.getTarget(e);
    	
    	//walk up the DOM tree looking for an <li>
    	//in the target's ancestry; desist when you
    	//reach the container div
    	while (elTarget.id != "pollform") {
    		var yel = new YAHOO.util.Element(elTarget);	
    		YAHOO.log(yel,"info");
    		YAHOO.log(yel.get("type"),"info");
    		//are you an li?
    		if(elTarget.nodeName.toUpperCase() == "INPUT") {
    			//yes, an li: so write out a message to the log
    			if(yel.get("type") === "checkbox"){
        			if(yel.get("checked")){
        				YAHOO.simplepoll.choice_num = YAHOO.simplepoll.choice_num + 1;
        			}else{
        				YAHOO.simplepoll.choice_num = YAHOO.simplepoll.choice_num - 1;
        				if(YAHOO.simplepoll.choice_num < 0)YAHOO.simplepoll.choice_num=0;
        			}
        			YAHOO.log(YAHOO.simplepoll.choice_num,"info");
    			}
    			//and then stop looking:
    			break;
    		} else {
    			//wasn't the container, but wasn't an li; so
    			//let's step up the DOM and keep looking:
    			elTarget = elTarget.parentNode;
    		}
    	}
    }
    //attach clickHandler as a listener for any click on
    //the container div:
   
    //
    // -->
    //
    </script>