servlet 直接传递List对象

package cn.itcast.estore.web.servlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

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

import cn.itcast.estore.domain.Order;
import cn.itcast.estore.domain.User;
import cn.itcast.estore.service.OrderService;

public class ShowOrderServlet extends HttpServlet {

   @Override
   public void doGet(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {

       // 1.获取当前用户
       User user = (User) request.getSession().getAttribute("existUser");
       // 2.调用service中查看订单方法
       OrderService service = new OrderService();
       List<Order> lists = null;
       try {
           lists = service.findOrder(user);
           if (lists != null) {
               // 3.显示订单信息
               request.setAttribute("orders", lists);
               request.getRequestDispatcher("/showOrder.jsp").forward(request,
                       response);
               return;
           }

       } catch (SQLException e) {
           e.printStackTrace();
       }
   }

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

}

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>订单列表</title>
<script type="text/javascript">
function findProductByOrder_id(order_id) {

var btn = document.getElementById("btn_" + order_id);
var div = document.getElementById("div_" + order_id);

       //1.得到xmlHttpRequest对象
       var xmlhttp = null;
       if (window.XMLHttpRequest) { // code for all new browsers
           xmlhttp = new XMLHttpRequest();
       } else if (window.ActiveXObject) {// code for IE5 and IE6
           xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
       }

       if (btn.value != "关闭") {
           div.style.display = "block";
           //2.注册回调函数
           xmlhttp.onreadystatechange = function() {
               //5.在回调函数里处理返回数据
               //处理响应数据当信息全部返回，并且成功
               if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

                   var jsonPs = eval("(" + xmlhttp.responseText + ")");
                   String
                   table = "<table border='2px' align='center'><tr><td>商品名称</td><td>类别</td><td>价钱</td><td>描述</td></tr>";
                   for ( var i = 0; i < jsonPs.length; i++) {
                       table += "<tr><td>" + jsonPs[i].pname + "</td><td>"
                               + jsonPs[i].category + "</td><td>"
                               + jsonPs[i].price + "</td><td>"
                               + jsonPs[i].desc + "</td></tr>";
                   }
                   table += "</table>";
                   div.innerHTML = table;
               }
           }
           //3.设置连接方式，建立服务器连接
           xmlhttp.open("get",
                   "${pageContext.request.contextPath}/findProductByOrderId?id="
                           + order_id);
           //4.发送请求
           xmlhttp.send(null);

           btn.value = "关闭";
       } else {
           btn.value = "查看";
           div.style.display = "none";
       }
   };
</script>
</head>
<body>
   <table border="2px" align="center">
   <tr><td colspan="8"><a href="${pageContext.request.contextPath}/downLoad">下载销售榜单</a></td></tr>
       <tr>
           <td>订单编号</td>
           <td>订单总价</td>
           <td>下单时间</td>
           <td>收货地址</td>
           <td>收货人</td>
           <td>支付状态</td>
           <td>订单详情</td>
           <td>删除订单</td>

       </tr>
       <c:forEach items="${orders}" var="order">
           <tr>
               <td>${order.id}</td>
               <td>${order.money}</td>
               <td>${order.ordertime}</td>
               <td>${order.receiverinfo}</td>
               <td>${order.username}【${order.nickname}】</td>

来源：CSDN

作者：live801

链接：https://blog.csdn.net/live801/article/details/103951387

标签

xmlhttp