index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<table border="2" align="center">
<tr>
<td>商品名称</td>
<td>商品单价</td>
<td>供货商</td>
<td>放入购物车</td>
</tr>
<tr>
<td>华为pro13</td>
<td>8888</td>
<td>华为</td>
<td><a href="/myWeb/one?goodsName=华为pro13">放入购物车</a></td>
</tr>
<tr>
<td>榴莲</td>
<td>88</td>
<td>泰国</td>
<td><a href="/myWeb/one?goodsName=榴莲">放入购物车</a></td>
</tr>
<tr>
<td>内裤</td>
<td>8</td>
<td>老鸭</td>
<td><a href="/myWeb/one?goodsName=内裤">放入购物车</a></td>
</tr>
<tr align="center">
<td colspan="4">
<a href="/myWeb/two">查看我的购物车</a>
</td>
</tr>
</table>
</body>
</html>
样式
Title
WEB-XML
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
version="5.0">
<servlet>
<servlet-name>oneServlet</servlet-name>
<servlet-class>oneServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>TwoServlet</servlet-name>
<servlet-class>TwoServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TwoServlet</servlet-name>
<url-pattern>/two</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>oneServlet</servlet-name>
<url-pattern>/one</url-pattern>
</servlet-mapping>
</web-app>
oneServlet
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import java.io.IOException;
public class oneServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String goodsName=request.getParameter("goodsName");
System.out.println(goodsName);
HttpSession session=request.getSession();
Integer goodsNum=(Integer) session.getAttribute(goodsName);
if (goodsNum==null){
session.setAttribute(goodsName,1);
}else{
session.setAttribute(goodsName,goodsNum+1);
}
}
}
TwoServlet
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import java.io.IOException;
import java.util.Enumeration;
public class TwoServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
System.out.println("999");
Enumeration goodsNames = session.getAttributeNames();
while(goodsNames.hasMoreElements()){
String goodsName = (String) goodsNames.nextElement();
int goodsNum = (int)session.getAttribute(goodsName);
System.out.println("商品名称：" + goodsName + "个数" + goodsNum);
}
}
}