flex3 Grid获取jsp数据的简单应用

很多时候我们需要在jsp展现数据用的都是table,来看看
用flex3的Grid怎么做。

测试数据:


if object_id('product') is not null
   drop table product

create table product
(
  id int primary key identity(1,1),
  productName varchar(50),
  remark varchar(100)
)

declare @i int
set @i = 1
while @i < 100
begin
   insert into product values('产品' + convert(varchar(3),@i),'备注' + convert(varchar(3),@i))
   set @i = @i + 1
end


select * from product
grid需要的是xml数据源:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="list.send()">
    <!--jsp请求-->
    <!--<mx:HTTPService id="list" url="../index.jsp" />-->
    <!--Servlet请求-->
    <mx:HTTPService id="list" url="../productServlet" />
    <!--grid数据绑定-->
    <mx:DataGrid dataProvider="{list.lastResult.catalog.product}"  width="395" height="307" x="223" y="54" color="#F2C50F"></mx:DataGrid>
</mx:Application>

看一提供数据的Servlet:
package com;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dao.ProductDao;
import com.vo.Product;

@SuppressWarnings("serial")
public class ProductServlet extends HttpServlet
{
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException
    {

        response.setContentType("text/html");
        response.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();
        String str = "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
        str += "<catalog>";
        ProductDao srv = new ProductDao();
        List<Product> list = null;
        list = srv.getAll();
        Product product;
        for (int i = 0; i < list.size(); i++)
        {
            product = (Product) list.get(i);
            str += "<product productId=\"" + product.getId() + "\">";
            str += "<productName>" + product.getProductName() + "</productName>";
            str +=     "<remark>" + product.getRemark() +"</remark>";
            str += "</product>";
        }
        str += "</catalog>";
        out.write(str);
       
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException
    {
        this.doGet(request, response);
    }

}
当然你也可以写成jsp的形式:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="com.dao.ProductDao"%>
<%@page import="com.vo.Product"%>

<?xml version="1.0" encoding="utf-8"?>
<catalog>
<%
    ProductDao srv = new ProductDao();
    List<Product> list = null;
    list = srv.getAll();
    Product product;
    for (int i = 0; i < list.size(); i++)
    {
        product = (Product) list.get(i);
%>
<product productId="<%=product.getId()%>">
    <productName><%=product.getProductName()%></productName>
    <remark><%=product.getRemark()%></remark>
</product>
<%
    }
%></catalog>

HTTPService标签实例化一个对象它将会请求jsp和反序列化请求对象。url属性需要指定jsp或Servlet Action并且返回xml数据。其中list是HTTPService标签的id,lastResult属性包含了一个对象叫"catalog",相当于xml的catalog节点。在catalog节点下有节点数组product.这个list.lastResult.catalog.product相当于从HTTPService请求jsp返回的数组。

如图: