struts2中<s:append>标签的使用

append标签用于将多个集合对象拼接起来,组成一个新的集合,通过这种拼接,从而允许通过一个<s:iterator../>标签就完成多个集合的迭代.

 

appendTag.jsp

 

<s:append id="list">
    <s:param value="#request.list1"/>
    <s:param value="#request.list2"/>
    <s:param value="#request.list3"/>
    <s:param value="#request.list4"/>
   </s:append>
   <s:iterator value="%{list}">
    <s:property/><br>
   </s:iterator>

 

AppendTagAction.java

public String execute() throws Exception {
 

  HttpServletRequest request = ServletActionContext.getRequest();
  List list1 = new ArrayList();
  list1.add("11");
  list1.add("22");
  List list2 = new ArrayList();
  list2.add("aa");
  list2.add("bb");
  List list3 = new ArrayList();
  list3.add("AA");
  list3.add("BB");

request.setAttribute("list1", list1);
  request.setAttribute("list2", list2);
  request.setAttribute("list3", list3);
  request.setAttribute("list4", list4);
  return "appendTag";

}