马克-to-win：下 面我们先给出一个最简单的mvc例子。这是一个常见的购物车的例子。在下面的例子当中，作为View的add.jsp提交给作为Controller的 ServletHello1.java来处理。真正的处理过程交给了作为Model的Cart.java来处理。作为Controller的ServletHello1.java，用response.sendRedirect("add.jsp");这句话，最后控制流程跳转到 add.jsp。
例1.1.1：
add.jsp:
<%@ page contentType="text/html; charset=GBK" %>
<html>
<body>
<hr>
<center><h3>书目</h3></center>
<table border="1" width="300" cellspacing="0" cellpadding="3" align="center">
<tr><th>书名</th><th>价格</th></tr>
<tr>
<form action="MarkToWinServlet" method="post">
<td>Java自学</td>
<td>25</td>
<td><input type="submit" name="Submit" value="Add"></td>
<input type="hidden" name="id" value="1">
<input type="hidden" name="title" value="Java自学">
<input type="hidden" name="price" value="25">
</form>
</tr>
<tr>
<form action="MarkToWinServlet" method="post">
<td>C 精通</td>
<td>28</td>
<td><input type="submit" name="Submit" value="Add"></td>
<input type="hidden" name="id" value="2">
<input type="hidden" name="title" value="C 精通">
<input type="hidden" name="price" value="28">
</form>
</tr>
</table>
<a href="cart.jsp">看看购物车</a>
</body>
</html>
package com;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class ServletHello1 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
Cart cart=(Cart)session.getAttribute("cart");
if(cart==null ) cart = new Cart();
request.setCharacterEncoding("GBK");
String id = request.getParameter("id");
String title = request.getParameter("title");
String price = request.getParameter("price");
cart.addItem(id, title, price);
session.setAttribute("cart", cart);
response.sendRedirect("add.jsp");
}
}
更多请看：https://blog.csdn.net/qq_44594371/article/details/103181401
