1、java将List容器封装的数据转化为JSON数据格式

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
		response.setCharacterEncoding("utf-8");
		List<Userinfo> list = userService.getUserinfos();
		//业务层获取数据
		JSONArray jsonData = JSONArray.fromObject(list);
		//list转化为JSONArrray
		PrintWriter pw = response.getWriter();
		pw.write(jsonData.toString());
		pw.close();
	}

2、js处理json数据

 function showUserList()
         {  
             postXmlHttp("./UserListServlet.do","UserCallback(resultValue)","Loading()");
         }
         
         function UserCallback(jsonDate)
         {
             //json数据 序列化成js对象
			 var jsObject = eval('('+jsonDate+')');
             var htmlStr = "<table align=center width=60%>"+
				           "<tr>"+
				               "<th>用户ID</th><td>密码</td><td>用户名</td><td>位置</td><td>操作</td>"+
				           "</tr>";
             for(var i=0;i<jsObject.length;i++)
             {
                 htmlStr+="<tr id='tr"+i+"'>"+
                              "<td>"+jsObject[i].userid+"</td>"+
                              "<td>"+jsObject[i].pword+"</td>"+
                              "<td>"+jsObject[i].username+"</td>"+
                              "<td>"+jsObject[i].position+"</td>"+
                              "<td><a herf='#' onclick=\"editUser(tr"+i+");\">编辑</a></td>"+
                          "</tr>";
             }
             div.innerHTML=htmlStr+"</table>";
         }
         
         function Loading()
         {
            //div.style="with:100%;text-align:center";
            div.innerHTML="<font color=red>正在获取数据请稍候... ...</font>";
         
         }