老师帮看看，跳转页面时404报错
package com.leo.servlet;
import java.io.IOException;
import java.util.List;
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.DiskFileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.jasper.tagplugins.jstl.core.ForEach;
/**
* 添加菜品的servlet
*/
public class FoodAddServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//数据接收，文件上传
try {
//1.创建一个磁盘文件项工厂
DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
//2.创建核心解析类
ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
//3.解析request请求，返回list集合，集合中存放的是FileItem对象
List<FileItem> list = servletFileUpload.parseRequest(request);
//4.遍历集合，获得每个FileItem
for(FileItem fileItem : list){
//判断是否是文件上传项
if(fileItem.isFormField()) {
//普通表单项
//接收表单项参数的值
//获得表单项name属性的值
String name = fileItem.getFieldName();
//获得表单项的值
String value = fileItem.getString("UTF-8");
System.out.println(name+" "+ value);
}else {
//文件上传项
}
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
--------------------------------------------------------------------------
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<base href="/FoodManagementSystem">
<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="/FoodManagementSystem/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>
------------------------------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>FoodManagementSystem</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>InitServlet</display-name>
<servlet-name>InitServlet</servlet-name>
<servlet-class>com.leo.servlet.InitServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>InitServlet</servlet-name>
<url-pattern>/InitServlet</url-pattern>
</servlet-mapping>
</web-app>
正在回答
<servlet> <servlet-name>FoodAddServlet</servlet-name> <servlet-class>com.leo.servlet.InitServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>FoodAddServlet</servlet-name> <url-pattern>/FoodManagementSystem/FoodAddServlet</url-pattern> </servlet-mapping>
上边的代码中有两处错误，
1、<servlet-class></servlet-class>中要写的是FoodAddServlet的具体地址，而不是InitServlet的
2、同学的访问路径<url-pattern></url-pattern> 中要改成
<url-pattern>/FoodAddServlet</url-pattern>
否则，访问的时候，就变成以下的访问路径了。这里的访问路径不包括项目名http://localhost:8080/FoodManagementSystem/FoodManagementSystem/FoodAddServlet
如果我的回答解决了你的疑惑，请采纳！祝学习愉快！
你好同学，建议你在web.xml中注册FoodAddServlet的配置信息，否则就会出现路径404的错误，祝学习愉快~
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