Question

文章将通过以下代码显示，文章ID通过URL输入。

现在是我的问题，我想使用Ajax将id / price推送到servlet，然后servlet在所有相关站点上添加/更新Shopping cart。被记录的日志为用户提供了会话

但是我的servlet不接收任何数据，会话属性总是带有NULL。

    <script src="js/islogged.js" type="text/javascript"></script>

    <script>
    if (location.search.length > 1) {
       var nr = location.search.substring(1, location.search.length);
       nr = unescape(nr);
    }
    $.ajax({
        type: "GET",
        url: "./Article",
        data: { pid: nr},
        contentType: "application/x-www-form-urlencoded",
        success: function(data) {
            $('#Price').html(data.productPrice + " &euro;");

            var stern = "";
            for(var i=0; i < data.rating; i++) {
                stars= stars+ "&#9733; "; 
            }
            for(var i=data.rating; i < 5;i++) {
                stars= stars+ "&#9734;" 
            }

            $('#test').append("<h2 class=\"section-heading\">" + data.prductName + "</h2>" +    //productName
                              "<div hidden id=\"Articlenumber\">" + data.id + "</div>" + 
                              "<hr class=\"my-4\">" +
                              "<p class=\"mb-5\">" + stars+ "</p>" +
                              "<p class=\"mb-5\">" + data.productDescription + "</p>" +
                              "");                  
        }, 
        error: function(jqXHR, textStatus, errorThrown) {
            // not implemented right now
            alert("Error");
        }}
    )

该网站显示商品说明，我将商品ID /价格用于购物车。

我可以更改页面上的文章数量，但其他所有内容均保持不变。当我点击“提交”时，我想在购物车中添加商品名称/编号和价格

<p align="center">
             <div>
                     <div class="text-center">
                             <h3 align="center"><div class="Price" id="Price">0&euro;</div></h3>
                             <p>+ Shipping Costs</p>
                     </div>
             </div>
             <div>
                     <div class="profil" adding="profiletextbox">
                             <p align="center">
                             <input id="a" value="1" min="1" type="number">&nbsp;St&uuml;ck
                             </p>
                     </div>
             </div>
             <div class="text-center">
             <form><input id="add" type="submit" class="btn btn-primary btn-xl js-scroll-trigger" value="Submit" /></form>

             </div>
     </p>

这是我精心制作的用于将数据获取到servlet的方法（它直接在上面显示的ajax下）

$("#add").click(function(){
    $.ajax
    (
    {
        type:"GET",
        url:"./ShoppingCart",
        data:{id: nr, anz: a},
        success:function(data){alert(data);},
        error:function(){alert('errorpushtoservlet');}

    }
);
    }

我的ShoppingCart.java，我只是为了安全起见检查了会话，但没有任何问题。

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ShoppingCart extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {

    HttpSession session = request.getSession(false);

    //int nr = Integer.parseInt(request.getParameter("nr"));
    String anz = request.getParameter("anz");
    String nr = request.getParameter("id");


    String id = String.valueOf(session.getAttribute(nr));

    String count = String.valueOf(session.getAttribute(anz));

    session.setAttribute("id", id);
    session.setAttribute("count", count);


    System.out.println("print1: "+request.getSession().getId());
    System.out.println("id2 = " + id);
    System.out.println("anz = " + anzahl);

}

}

使用AJAX / Servlet管理购物车时出现问题

0 个答案: