<htmk:link>的使用
<html:link action="/RegUserUI">注册（很好）</html:link><br>

<%
request.setAttribute("name", "kakashi");
%>
<html:link action="/RegUserUI" paramId="username" paramName="name">注册（url编码）</html:link><br>---> ....?username="kakashi"(url编码)

<%
Date now = new Date();
request.setAttribute("now", now);
%>
<!-- paramId表示参数名,从paramName中取属性paramProperty-->
<html:link action="/RegUserUI" paramId="t" paramName="now" paramProperty="time">注册（对象属性url编码）</html:link><br>

<%
Map<String,String> map = new HashMap<String,String>();
map.put("x","1");
map.put("y","2");
map.put("z","3");
request.setAttribute("person", map);
%>
<!-- 传递多个参数 -->
<html:link action="/RegUserUI" name="person">注册（多个参数）</html:link><br>