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默认情况下，Beetl的html标签并不支持父子嵌套，就像类似jsp标签那样，父标签需要知道子标签的信息，子标签也需要知道父标签信息。但是beetl只需要简单扩展，就能完成嵌套标签支持。首先看一个最终的使用效果，实现俩个html标签table.tag,tr.tag.可以在页面上这么用:
<#table data ="${userList}">
<#tr class="3c" name="name"> 名称 </#tr>
</#table>
public class HTMLNestTagSupportWrapper extends HTMLTagSupportWrapper{
public void render(){....}
}
public class TagNestContext {
private Tag tag = null;
private TagNestContext parent = null;
private List<TagNestContext> children = null;
public Tag getTag() {
return tag;
}
public void setTag(Tag para) {
this.tag = para;
}
public TagNestContext getParent() {
return parent;
}
public void setParent(TagNestContext parent) {
this.parent = parent;
}
public List<TagNestContext> getChildren() {
if(children==null) children = new ArrayList<TagNestContext>();
return children;
}
public void setChildren(List<TagNestContext> children) {
this.children = children;
}
}
public void render()
{
HttpServletRequest request = (HttpServletRequest)this.ctx.getGlobal("request");
TagNestContext tnc = (TagNestContext)request.getAttribute("tagContext");
if(tnc==null){
tnc = new TagNestContext();
tnc.setTag(this);
request.setAttribute("tagContext", tnc);
super.render();
request.removeAttribute("tagContext");
}else{
TagNestContext child = new TagNestContext();
child.setParent(tnc);
child.setTag(this);
tnc.getChildren().add(child);
request.setAttribute("tagContext", child);
super.render();
//重新设置
request.setAttribute("tagContext", child.getParent());
}
}
public String getTagName(){
return (String)this.args[0];
}
public Object get(String attr){
Map map = (Map)this.args[1];
return map.get(attr);
}
<tr class="${class}">${tagBody}</tr>
<table>
${tagBody}
<% for(var item in data){%>
<tr>
<%
var tag = getTagContext();
var children = tag.children;
for(var tdTagCtx in children){
print("<td>");
var tdTag = tdTagCtx.tag;
var name = tdTag.tagName;
var value = item[name];
print(value);
println("</td>");
}
%>
</tr>
<%} %>
</table>
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原文地址：http://my.oschina.net/u/567839/blog/376855
