idea上传图片显示问题
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | <%@ page contentType="text/html;charset=UTF-8" language="java" %><!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>添加菜品</title><style type="text/css"></style></head><body> <center> <h1>菜品添加</h1> <form action="/foods/foodAddServlet" method="post" enctype="multipart/form-data"> <table border="1px" width="400px" cellspacing="0px" cellpadding="0px"> <tr> <td>菜品 ID</td> <td><input type="text" name="id"></td> </tr> <tr> <td>菜 名</td> <td><input type="text" name="foodName"></td> </tr> <tr> <td>口 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 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="添加"> <input type="reset" value="重置"> </td> </tr> </table> </form> </center></body></html> |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | package com.imooc.servlet;import com.imooc.entity.Food;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 javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.*;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;@WebServlet(name = "FoodAddServlet", urlPatterns = "/foodAddServlet")public class FoodAddServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //判断表单提交方式 if(ServletFileUpload.isMultipartContent(request)){ Food food = new Food(); Map<String,String> map = new HashMap<>(); List<Food> listFood = new ArrayList<>(); ServletFileUpload servletFileUpload = new ServletFileUpload(new DiskFileItemFactory()); try { List<FileItem> list = servletFileUpload.parseRequest(request); for(FileItem fileItem : list){ if(fileItem.isFormField()){//普通项 String name = fileItem.getFieldName(); String value = fileItem.getString("UTF-8"); map.put(name, value); }else{//文件上传项 String name = fileItem.getName(); String path = this.getServletContext().getRealPath("/upload"); File file = new File(path); if(file.exists() == false){ file.mkdir(); } String url = path+"\\"+System.currentTimeMillis()+name; System.out.println("url:"+url); InputStream is = fileItem.getInputStream(); OutputStream os = new FileOutputStream(url); int len = 0; byte[] b = new byte[1024]; while((len=is.read())!=-1){ os.write(b,0,len); } is.close(); os.close(); map.put("_path", url); } } food.setId(map.get("id")); food.setName(map.get("foodName")); food.setTaste(map.get("taste")); food.setPrice(map.get("price")); food.setContent(map.get("description")); food.setPath(map.get("_path")); listFood.add(food); System.out.println("listFood:"+listFood); this.getServletContext().setAttribute("listFood",listFood); request.getRequestDispatcher("/showFoodList.jsp").forward(request,response); } catch (FileUploadException e) { e.printStackTrace(); } }else{ } }} |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | <%@ page contentType="text/html;charset=UTF-8" language="java" %><%@ page import="com.imooc.entity.Food" %><%@ page import="java.util.List" %><% List<Food> listFood = (List<Food>) request.getSession().getServletContext().getAttribute("listFood");%><!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>菜品信息展示</title><style type="text/css"></style></head><body> <center> <h1>菜品查询</h1> <table border="1px" cellspacing="0px" cellpadding="0px" width="800px"> <thead> <tr> <th>菜品ID</th> <th>菜名</th> <th>口味</th> <th>菜品图片</th> <th>价格</th> <th>菜品描述</th> </tr> </thead> <tbody> <% for(Food food : listFood){ %> <tr> <td><%=food.getId() %></td> <td><%=food.getName() %></td> <td><%=food.getTaste() %></td> <td> <img src="/foods/upload/<%=food.getPath().substring(food.getPath().lastIndexOf("\\")+1) %>"> </td> <td><%=food.getPrice() %></td> <td><%=food.getContent() %></td> </tr> <% } %> </tbody> </table> </center></body></html> |
问题：
1、图片不显示。
2、方便告知图片显示，应该用什么路径。好难理解感觉。
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3回答
不是路径问题，是同学上传的图片是错的，打不开。
上传图片的时候，同学忘记传参数b 了：
如果我的回答解决了你的疑惑，请采纳！祝学习愉快！
好帮手慕阿莹
2018-12-05 15:38:36
同学可以在菜品展示的页面添加代码：
1 2 3 4 | <%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%> |
在图片的展示处：
<img
src="<%=basePath %>/upload/<%=food.getPath().substring(food.getPath().lastIndexOf("\\")+1) %>">
改成这个路径试试
<%=basePath %>中的代码是获取发布的路径，包括项目名。
food.getPath().substring(food.getPath().lastIndexOf("\\")+1) 这个其实是在获取图片的名称。
拼接上upload文件的名字。
如果我的回答解决了你的疑惑，请采纳！祝学习愉快！
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