dojo+json+ajax

1.下载

json-lib-2.4-jdk15.jar,commons-beanutils.jar，commons-httpclient.jar，commons-lang.jar，ezmorph.jar，morph-1.0.1.jar

2.程序中引入所需的类文件：

import net.sf.json.JSONObject;

3.编写Java文件：

 public ActionForward test3(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {
  request.setCharacterEncoding("utf-8");
  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  Map<String,Object> map= new HashMap<String,Object>();
  List<Category> list=new ArrayList<Category>();
  Category  c=new Category();
  c.setName("jianping");
  c.setFid(2);
  Category  c2=new Category();
  c2.setName("yize");
  c2.setFid(3);
  list.add(c);
  list.add(c2);
  map.put("total", 123);
  map.put("list",list);
  out.print(JSONObject.fromObject(map).toString());
  out.flush();
  out.close();
  return null;
 }

4.页面调用如下：

  function sayHello3() {
         dojo.xhrGet({
             url: "<%=request.getContextPath()%>/test.do?method=test3",//修改成相应的路径
             handleAs: "json",//此处必为json
             load: function(data)
             {
              var total=data.total;//提取元素total
              alert(total);
              var items=data.list; //提取元素list
              for(var i=0;i<items.length;i++)
              {
                alert(items[i].name);
              }
             },
             error: function(response)
             {
               alert("Error"+response.message);
             }
         });
     }