修改菜品信息，不能进入到doPost方法中！

FoodUpdateServlet.java

package com.imooc.servlet;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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 org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.imooc.model.Food;
import com.imooc.model.FoodDaoImpl;
import com.imooc.utils.UploadUtils;

/**
 * Servlet implementation class FoodUpdateServlet
 */
@WebServlet("/updateservlet")
public class FoodUpdateServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private static FoodDaoImpl foodDaoImpl = new FoodDaoImpl();

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		System.out.println("----");
		try {
			DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();

			ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);

			List<FileItem> list = servletFileUpload.parseRequest(request);
			System.out.println(list);
			List<String> tastelist = new ArrayList<String>();
			Map<String, String> map = new HashMap<String, String>();
			for (FileItem fileItem : list) {
				if (fileItem.isFormField()) {
					String name = fileItem.getFieldName();
					String value = fileItem.getString("UTF-8");
					System.out.println(name + "  " + value);
					if (name.equals("taste")) {
						String taste = fileItem.getString("UTF-8");
						tastelist.add(taste);
					} else {
						map.put(name, value);
					}
				} else {
					String fileName = fileItem.getName();
					if (fileName != null && !fileName.equals("")) {
						String uuidFileName = UploadUtils.getUUIDFileName(fileName);

						InputStream is = fileItem.getInputStream();

						String path = this.getServletContext().getRealPath("/upload");

						String url = path + "\\" + uuidFileName;

						OutputStream os = new FileOutputStream(url);
						int len = 0;
						byte[] b = new byte[1024];
						while ((len = is.read(b)) != -1) {
							os.write(b, 0, len);
						}
						is.close();
						os.close();
						map.put("foodImage", uuidFileName);
					}
				}
			}
			String taste = tastelist.toString().replace("[", "").replace("]", "");
			map.put("taste", taste);

			foodDaoImpl.updateFood(creatFood(map));

		} catch (FileUploadException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}	}

	public Food creatFood(Map<String, String> map) {
		String id = map.get("id");
		String foodName = map.get("foodName");
		String taste = map.get("taste");
		String foodImage = map.get("foodImage");
		double price = Double.parseDouble(map.get("price"));
		String description = map.get("description");
		Food food = new Food(id, foodName, taste, foodImage, price, description);
		return food;
	}

}

updateFood.html

<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜品修改(根据菜品ID进行修改)</title>
<style type="text/css">

</style>
</head>
<body>
	<center>
		<h1>根据菜品ID修改</h1>
		<form action="/Vegetable_manage/updateservlet" method="post" enctype="multipart/form-data">
			<table border="1px" width="400px" cellspacing="0px" cellpadding="0px">
				<tr>
					<td>修改ID</td>
					<td><input type="text" name="id"></td>
				</tr>d
				<tr>
					<td>菜&nbsp;&nbsp;名</td>
					<td><input type="text" name="foodName"></td>
				</tr>
				<tr>
					<td>口&nbsp;&nbsp;味</td>
					<td>
						<input type="radio" name="taste" value="香辣">香辣
						<input type="radio" name="taste" value="微辣">微辣
						<input type="radio" name="taste" value="麻辣">麻辣
						<input type="radio" name="taste" value="不辣">不辣
					</td>
				</tr>
				<tr>
					<td>菜品图片</td>
					<td><input type="file" name="foodImage"></td>
				</tr>
				<tr>
					<td>价&nbsp;&nbsp;格</td>
					<td><input type="text" name="price"></td>
				</tr>
				<tr>
					<td>菜品描述</td>
					<td>
						<textarea name="description"></textarea>
					</td>
				</tr>
				<tr   style="text-align:center;width:20px">
					<td colspan="2">
						<input type="submit" value="修改">
						<input type="reset" value="重置">
					</td>
				</tr>
			</table>
		</form>
	</center>
</body>
</html>

慕瓜338743 2019-03-03

源自：项目：登录注册功能 5-2 作业题