<struts:autocompleter>，autocompleter标签具有自动完成功能的下拉框，能根据所填写的内容筛选下拉框的内容。使用autocompleter标签必须使用Ajax主题，因为它用到了DOJO的JavaScript库。
autocompleteAjaxTag.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="struts"%>
<struts:head theme="ajax" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<struts:url id="dataUrl" value="/autocompleteAjaxData1.jsp" />
<!-- 数据URL -->
<struts:autocompleter name="country" theme="ajax" href="%{dataUrl}"
loadOnTextChange="true" loadMinimumCount="0" autoComplete="false"
showDownArrow="true" indicator="indicator" />
<img id="indicator" src="images/loading.gif">
</body>
</html>
autocompleteAjaxData1.jsp
获取前缀，找到前缀匹配项，封装成JSONArray，然后回传。
<%@page import="java.util.List"%>
<%@page import="java.util.ArrayList"%>
<%@page import=" net.sf.json.JSONArray"%>
<%@page import=" java.io.IOException"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
out.clear();//清空输出数据
request.setCharacterEncoding("UTF-8");//设置request编码
response.setHeader("Pragma", "no-cache");//禁止缓存
response.setHeader("cache-control", "no-cache");
response.setDateHeader("Expires", 0);
List<String> countries = new ArrayList<String>();
countries.add("Afghanistan");
countries.add("Aland Islands");
countries.add("Albania");
countries.add("Algernia");
countries.add("American Samno(USA)");
countries.add("Andorra");
String countryPrefix = request.getParameter("country");//获取AutoCompleter已经填写的内容
if (null == countryPrefix) {
countryPrefix = "";
}
List<String> buffer = new ArrayList<String>();
for (int i = 0; i < countries.size(); i++) {
if (countries.get(i).toLowerCase()
.startsWith(countryPrefix.toLowerCase())) {
buffer.add(countries.get(i));
}
}
JSONArray jsonArray = JSONArray.fromObject(buffer);
Thread.sleep(500);//当前线程睡眠0.5秒，演示indicator
try {
response.setContentType("aplication/json;charset=UTF-8");
out.print(jsonArray);
} catch (IOException e) {
e.printStackTrace();
}
%>
struts2 autocompleter 动态下拉菜单,布布扣,bubuko.com
原文地址：http://blog.csdn.net/arcticfoxhan/article/details/38558129
