package com.imooc.food;

public class Food {
 private String id;
 private String name;
 private String taste;
 private String foodAdress;
 private String price;
 private String describe;
 public Food() {
  super();
  // TODO Auto-generated constructor stub
 }
 public Food(String id, String name, String test, String foodAdress, String price, String describe) {
  super();
  this.id = id;
  this.name = name;
  this.taste = taste;
  this.foodAdress = foodAdress;
  this.price = price;
  this.describe = describe;
 }
 public String getId() {
  return id;
 }
 public void setId(String id) {
  this.id = id;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public String getTaste() {
  return taste;
 }
 public void setTaste(String test) {
  this.taste = test;
 }
 public String getFoodAdress() {
  return foodAdress;
 }
 public void setFoodAdress(String foodAdress) {
  this.foodAdress = foodAdress;
 }
 public String getPrice() {
  return price;
 }
 public void setPrice(String price) {
  this.price = price;
 }
 public String getDescribe() {
  return describe;
 }
 public void setDescribe(String describe) {
  this.describe = describe;
 }
 @Override
 public String toString() {
  return "菜品的信息: id=" + id + ", name=" + name + ", taste=" + taste + ", foodAdress=" + foodAdress + ", price="
    + price + ", describe=" + describe ;
 }
 
 
 
}

package com.imooc.food;

import java.util.ArrayList;
import java.util.List;

public class FoodDaolmpl {
 //全局变量:bd用来储存菜品信息(应该只有一个,所以只能创建一个FoodDaolmpl对象)
 private static final List<Food> db=new ArrayList();
 
 public static void addFood(Food food){
    db.add(food);
 }
 
 public static List<Food> getAllFood(){
  return db;
 }
 
 public static Food getFoodByName(String foodName){
  for (Food food : db) {
   if(foodName.equals(food.getName())){
    return food;
   }
  }
  return null;
 }
 
 public static Food getFoodById(String foodId){
  for (Food food : db) {
   if(foodId.equals(food.getId())){
    return food;
   }
  }
  return null;
 }
 
 public static void updateFood(Food newFood){
  for (Food food : db) {
   if(food.getId().equals(newFood.getId())){
    db.remove(food);
    db.add(newFood);
   }
  }
 }
 
 public static void deleteFoodById(String id){
  Food o=getFoodById(id);
  db.remove(o);
 }
}

package com.imooc.food.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.food.Food;
import com.imooc.food.FoodDaolmpl;
import com.imooc.food.utiles.UploadFileData;
import com.imooc.food.utiles.UploadUtils;

/**
 * 菜品添加的Servlet
 */
@WebServlet("/FoodAddServlet")
public class FoodAddServlet extends HttpServlet {
 protected void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  // 数据的接收
  Food food = UploadFileData.UploadFile(request);
  List<Food> foodList =FoodDaolmpl.getAllFood();
  for (Food food2 : foodList) {
   if(food.getId().equals(food2.getId())){
    request.setAttribute("msg", "此菜品id已存在!");
    request.getRequestDispatcher("/addFood.jsp").forward(request, response);
   }
  }
   FoodDaolmpl.addFood(food);
   // 添加成功,跳转到查询页面
   response.sendRedirect(request.getContextPath() + "/showFoodList.jsp");
  
 }

 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
  *      response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }

}

package com.imooc.food.servlet;

import java.io.IOException;
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 com.imooc.food.Food;
import com.imooc.food.FoodDaolmpl;

/**
 * Servlet implementation class FoodDeleteServlet
 */
@WebServlet("/FoodDeleteServlet")
public class FoodDeleteServlet extends HttpServlet {
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  String id =request.getParameter("id");
  for (Food food : FoodDaolmpl.getAllFood()) {
   if(food.getName().equals("id")){
    FoodDaolmpl.deleteFoodById(id);
    //删除成功,重定向到showFoodList.jsp
    request.getRequestDispatcher("/showFoodList.jsp").forward(request, response);
   }
  }
   request.getRequestDispatcher("/delecteById.jsp").forward(request, response);
  
 }

 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }

}

package com.imooc.food.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 com.imooc.food.Food;
import com.imooc.food.FoodDaolmpl;
import com.imooc.food.utiles.UploadFileData;

/**
 * Servlet implementation class FoodUpdateServlet
 */
@WebServlet("/FoodUpdateServlet")
public class FoodUpdateServlet extends HttpServlet {
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  //获取数据
  Food food=UploadFileData.UploadFile(request);
  //检查id是否存在
  List<Food> foodList =FoodDaolmpl.getAllFood();
  for (Food food2 : foodList) {
   if(food.getId().equals(food2.getId())){
    FoodDaolmpl.updateFood(food);
    //修改成功,跳转到查询页面
    request.getRequestDispatcher("/showFoodList.jsp").forward(request, response);
    
   }
  }  
   request.setAttribute("msg", "此菜品id不存在!");
   request.getRequestDispatcher("/updateFood.jsp").forward(request, response);
  
  
  
 }

 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }

}

package com.imooc.food.servlet;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;

import com.imooc.food.Food;
import com.imooc.food.FoodDaolmpl;

/**
 * 用于菜品管理的初始化
 */
@WebServlet(loadOnStartup=2,urlPatterns={"/InitServlet"})
public class InitServlet extends HttpServlet {
 @Override
 public void init() throws ServletException {
  //通过getAllFood方法获得db对象
  this.getServletContext().setAttribute("list", FoodDaolmpl.getAllFood());
 }
}

package com.imooc.food.servlet;

import java.io.IOException;
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 com.imooc.food.Food;
import com.imooc.food.FoodDaolmpl;

/**
 * Servlet implementation class SelectServlet
 */
@WebServlet("/SelectServlet")
public class SelectServlet extends HttpServlet {
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  String name =request.getParameter("foodName");
  Food food =FoodDaolmpl.getFoodByName(name);
  request.setAttribute("food", food);
  
  //查询成功,返回到查询界面
  response.sendRedirect(request.getContextPath()+"/showSelectFoodList.jsp");
 }

 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }

}

package com.imooc.food.utiles;

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

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.food.Food;
import com.imooc.food.FoodDaolmpl;

public class UploadFileData {
 /**
  * 文件的数据接收类
  * @throws IOException
  */
 public static Food UploadFile(HttpServletRequest request) throws IOException{
  String url=null;
  //定义一个Map集合用于保存接收到的数据
  Map<String ,String>map =new HashMap<String ,String>();
  //创建一个磁盘文件项工厂对象
  DiskFileItemFactory diskFileItemFactory =new DiskFileItemFactory();
  //创建一个核心解析类
  ServletFileUpload servletFileUpload =new ServletFileUpload(diskFileItemFactory);
  //解析request请求,返回的是List集合,集合中存放的是FileItem对象
  List<FileItem> list;
  try {
   list = servletFileUpload.parseRequest(request);
   //遍历集合,获得每个FileItem,判断是表单项还是文件上传项
   for (FileItem fileItem : list) {
    if (fileItem.isFormField()) {
     String name=fileItem.getFieldName();
     String value =fileItem.getString("UTF-8");
     System.out.println(name +"    " +value);
     map.put(name,value);
     
    }else{
     //文件上传项
     //文件上传功能
     //获得上传文件的名称
     String FileName =fileItem.getName();
     //通过工具类获得唯一文件名
     String uuidFileName = UploadUtils.getUUIDFileName(FileName);
     //获得文件上传数据
     InputStream is = fileItem.getInputStream();
     //获得文件上传的路径
     String path =request.getServletContext().getRealPath("/upload");
     //将输入流对接到输出流
     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();
    }
   }
   
  } catch (FileUploadException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  System.out.println(map);
  Food food=new Food();
  food.setId(map.get("id"));
  food.setName(map.get("foodName"));
  food.setPrice(map.get("price"));
  food.setDescribe(map.get("describe"));
  food.setTaste(map.get("taste"));
  food.setFoodAdress(url);
  return food;
  }
}

package com.imooc.food.utiles;

import java.util.UUID;

public class UploadUtils {
 /**
  * 文件上传的工具类
  * @author jt
  *
  */
 public static String getUUIDFileName(String fileName){
  int idx =fileName.lastIndexOf(".");
  String extention =fileName.substring(idx);
  String UUIDName = UUID.randomUUID().toString().replaceAll("-", "");
  String UUIDFileName = UUIDName+extention;
  
  return UUIDFileName;
 }
}

<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜品查询选项页面</title>
<style type="text/css">

</style>
</head>
<body>
 <center>
  <p><a href="showAllFoodList.jsp">查询所有菜品信息</a></p>
  <p><a href="selectFoodByName.html">菜名查询</a></p>
 </center>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜名查询</title>
<style type="text/css">

</style>
</head>
<body>
 <center>
  <h1>菜名查询</h1>
  <form action="<%=basePath%>/SelectServlet" method="post">
   <input type="hidden" name="type" value="2">
   <table width="400px" border="1px" cellspacing="0px" cellpadding="0px">
    <tr>
     <td>菜名</td>
     <td><input type="text" name="foodName"></td>
    </tr>
    <tr>
     <td colspan="2" style="text-align:center"><input type="submit" value="查询"></td>
    </tr>
   </table>
  </form>
 </center>
</body>
</html>