Fileupload 处理表单问题
Fileupload 处理普通表单项的时候，如果我在input中没有输入内容，然后提交表单，那么我后台是否能够获得name的值和此input中的值，如果通过fileItem.getFieldName();可以获取到name值，那对应的fileItem.getString("UTF-8");是什么。null还是"" ? 我自己测试过，在input中不出入内容，直接提交表单，除了<input type="file">以外，<input type="text">可以获取到name，但是对应的input的内容不是null，也不是""，<input type="radio"> 压根儿就获取不到name。 麻烦帮忙看一下。
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慕粉3355010
2018-11-25 16:29:00
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%@ page import="com.imooc.models.*" %>
<%
List<Food> list = (List<Food>)this.getServletContext().getAttribute("selectFoodList");
System.out.print("list:"+list);
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
tr {
text-align: center;
}
</style>
</head>
<body>
<center>
<h2>菜品查询</h2>
<table border="1px" cellpadding="0px" cellspacing="0px" width="80%">
<tr>
<td>菜品ID</td>
<td>菜名</td>
<td>口味</td>
<td>菜品图片</td>
<td>价格</td>
<td>菜品描述</td>
</tr>
<%
for(Food food : list){
String path = food.getFoodImage();
int num = path.lastIndexOf("/");
String a = path.substring(num+1);
String b = "/Foods/upload/" + a;
%>
<tr>
<td><%=food.getId() %></td>
<td><%=food.getFoodName() %></td>
<td><%=food.getTaste() %></td>
<td>
<%-- <img src="<%=food.getFoodImage() %>"> --%>
<img src="<%=b %>">
</td>
<td><%=food.getPrice() %></td>
<td><%=food.getDescription() %></td>
</tr>
<%
}
%>
</table>
</center>
</body>
</html>
／********************************／
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<center>
<h1>菜品管理系统</h1>
</center>
</body>
</html>
／*********************************／
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<center>
<form action="/Foods/UpdateFoodServlet" 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>
<td colspan="2" style="text-align: center; width="20px"">
<input type="submit" value="修改">
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
慕粉3355010
2018-11-25 16:27:04
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<center>
<form action="/Foods/SelectFoodByNameServlet" method="post">
<p>
<input type="text" id="searchName" name="searchName" placeholder="请输入菜名进行查询">
<input type="submit" value="查询">
</p>
</form>
</center>
</body>
</html>
／**********************／
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%@ page import="com.imooc.models.*" %>
<%
List<Food> list = (List<Food>)this.getServletContext().getAttribute("foodList");
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>菜品查询</title>
<style type="text/css">
tr {
text-align: center;
}
</style>
</head>
<body>
<center>
<h2>菜品查询</h2>
<table border="1px" cellpadding="0px" cellspacing="0px" width="80%">
<tr>
<td>菜品ID</td>
<td>菜名</td>
<td>口味</td>
<td>菜品图片</td>
<td>价格</td>
<td>菜品描述</td>
</tr>
<%
for(Food food : list){
String path = food.getFoodImage();
int num = path.lastIndexOf("/");
String a = path.substring(num+1);
String b = "/Foods/upload/" + a;
%>
<tr>
<td><%=food.getId() %></td>
<td><%=food.getFoodName() %></td>
<td><%=food.getTaste() %></td>
<td>
<%-- <img src="<%=food.getFoodImage() %>"> --%>
<img src="<%=b %>">
</td>
<td><%=food.getPrice() %></td>
<td><%=food.getDescription() %></td>
</tr>
<%
}
%>
</table>
</center>
</body>
</html>
慕粉3355010
2018-11-25 16:26:01
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>菜品管理系统</title>
</head>
<frameset rows="20%, 80%">
<frame src="./top.jsp"></frame>
<frameset cols="20%, 80%">
<frame src="./left.jsp"></frame>
<frame name="main"></frame>
</frameset>
</frameset>
</html>
／*********************／
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<p><a href="addFood.jsp" target="main">菜品添加</a></p>
<p><a href="selectFood.jsp" target="main">菜品查询</a></p>
<p><a href="updateFood.jsp" target="main">菜品修改</a></p>
<p><a href="deleteFood.jsp" target="main">菜品删除</a></p>
</body>
</html>
／******************************／
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>菜品查询</title>
</head>
<body>
<center>
<p><a href="/Foods/showFoodList.jsp">查询所有菜系</a></p>
<p><a href="/Foods/selectFoodByName.jsp">按条件查询菜系</a></p>
</center>
</body>
</html>
慕粉3355010
2018-11-25 16:25:03
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>菜品添加</title> </head> <body> <center> <h2>菜品添加</h2> <form action="/Foods/AddFoodServlet" 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> <td colspan="2" style="text-align: center; width="20px""> <input type="submit" value="添加"> <input type="reset" value="重置"> </td> </tr> </table> </form> </center> </body> </html>
慕粉3355010
2018-11-25 16:24:03
package com.imooc.servlet;
import java.io.IOException;
import java.util.ArrayList;
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.models.Food;
/**
* 条件查询Servlet
*/
@WebServlet("/SelectFoodByNameServlet")
public class SelectFoodByNameServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public SelectFoodByNameServlet() {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<Food> selectFoodList = new ArrayList<Food>();
selectFoodList.clear();
List<Food> list = (List<Food>)this.getServletContext().getAttribute("foodList");
String searchName= request.getParameter("searchName");
searchName = new String(searchName.getBytes("ISO8859-1"),"UTF-8");
System.out.println("searchName:"+searchName);
for(Food food : list) {
if(searchName.equals(food.getFoodName())) {
selectFoodList.add(food);
}
}
this.getServletContext().setAttribute("selectFoodList", selectFoodList);
request.getRequestDispatcher("/showFoodListByName.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
慕粉3355010
2018-11-25 16:21:14
package com.imooc.servlet;
import java.io.IOException;
import java.util.ArrayList;
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.models.Food;
/**
* 初始化Servlet
*/
public class InitServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public InitServlet() {
}
@Override
public void init() throws ServletException {
System.out.println("int.....");
List<Food> list = new ArrayList<Food>();
this.getServletContext().setAttribute("foodList", list);
}
}
慕粉3355010
2018-11-25 16:09:17
package com.imooc.models;
public class Food {
private String id;
private String foodName;
private String taste;//口味
private String foodImage;//菜品图片
private String price;
private String description;//菜品描述
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFoodName() {
return foodName;
}
public void setFoodName(String foodName) {
this.foodName = foodName;
}
public String getTaste() {
return taste;
}
public void setTaste(String taste) {
this.taste = taste;
}
public String getFoodImage() {
return foodImage;
}
public void setFoodImage(String foodImage) {
this.foodImage = foodImage;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
@Override
public String toString() {
return "Food [id=" + id + ", foodName=" + foodName + ", taste=" + taste + ", foodImage=" + foodImage
+ ", price=" + price + ", description=" + description + "]";
}
}
／******************************／
package com.imooc.models;
import java.util.UUID;
public class UUidName {
public static String setUUIDName(String name) {
int num = name.lastIndexOf(".");
String lastName = name.substring(num);
String firstName = UUID.randomUUID().toString();
String UUIDName = firstName.replace("-", "")+lastName;
return UUIDName;
}
}
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