为什么文件上传不了
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsp/jstl/fmt"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>新建图书信息</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
<link rel="stylesheet" href="css/add.css">
</head>
<body>
<nav class="navbar navbar-default">
<div class="container">
<div class="navbar-header">
<a class="navbar-brand" href="/dept/list.do">
图书信息管理
</a>
</div>
</div>
</nav>
<div class="container">
<div class="jumbotron">
<h1>Hello, XXX!</h1>
<p>请小心地新增图书信息，要是建了一个错误的就不好了。。。</p>
</div>
<div class="page-header">
<h3><small>新建</small></h3>
</div>
<form class="form-horizontal" action="<%=request.getContextPath() %>/BookList" method="post" enctype="multipart/form-data">
<div class="form-group">
<label for="name" class="col-sm-2 control-label">图书编号 ：</label>
<div class="col-sm-8">
<input name="bookId" class="form-control" id="bookId">
</div>
</div>
<div class="form-group">
<label for="name" class="col-sm-2 control-label">图书名称 ：</label>
<div class="col-sm-8">
<input name="bookName" class="form-control" id="bookName">
</div>
</div>
<div class="form-group">
<label for="categoryId" class="col-sm-2 control-label">分类 ：</label>
<select id="categoryId" name="categoryId" class="col-sm-2 form-control" style="width: auto;margin-left: 15px">
<f:if test="${!empty cList }">
<f:forEach var="itme" varStatus="idx" items="${sessionScope.cList}">
<option value="${itme.catId}" selected="selected">${itme.catname}</option>
</f:forEach>
</f:if>
<!-- 下拉列表的内容要从分类中进行读取，value值是分类id -->
</select>
</div>
<div class="form-group">
<label for="name" class="col-sm-2 control-label">价格 ：</label>
<div class="col-sm-8">
<input name="bookPrice" class="form-control" id="bookPrice">
</div>
</div>
<div class="form-group" >
<label for="name" class="col-sm-2 control-label">图书封面 ：</label>
<input type="file" id="bookPic" name="bookPic" enctype="multipart/form-data" style="padding-left: 15px">
</div>
<div class="form-group">
<label for="name" class="col-sm-2 control-label">备注 ：</label>
<div class="col-sm-8">
<input name="remarks" class="form-control" id="remarks">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" id="sub" class="btn btn-primary">保存</button>
</div>
</div>
</form>
</div>
<footer class="text-center" >
copy@imooc
</footer>
<script type="text/javascript" src="js/jquery-3.4.0.js"></script>
<script type="text/javascript">
var reg=/^[A-Za-z0-9]{4,15}$/;
var price_reg=/^[0-9]+(.[0-9]+)?$/;
var name_reg=/^[\u4E00-\u9FA5A-Za-z0-9]{2,10}$/;
var cat=$("#categoryId").val();
var bookPic=$("#bookPic").val();
var bookId=$("#bookId").val();
var bookName=$("#bookName").val();
var bookPrice=$("#bookPrice").val();
var remarks=$("#remarks").val();
if(cat==null){
alert("请先添加图书分类");
sub();
}
$("#bookPic").change(function(){
bookPic=$("#bookPic").val();
var suff= bookPic.substr(bookPic.lastIndexOf("."));
if(suff!=".jpg"&&suff!=".png"&&suff!=".jpeg"&&suff!=".PNG"){
alert("不支持此图片格式");
$("#bookPic").val(null);
sub()
}
})
$("#bookId").change(function(){
bookId=$("#bookId").val();
if(!reg.test(bookId)){
alert("编号由只能任意字母数字组成的4-15个字符");
$("#bookId").val(null);
sub()
}
})
$("#bookName").change(function(){
bookName=$("#bookName").val();
if(!name_reg.test(bookName)){
alert("请输入汉字或者字母数字2-10");
$("#bookName").val(null);
sub()
}
})
$("#remarks").change(function(){
remarks=$("#remarks").val();
if(!reg.test(remarks)){
alert("备注由任意字母数字组成的4-15个字符");
$("#remarks").val(null);
sub()
}
})
$("#bookPrice").on("change",function(){
bookPrice=$("#bookPrice").val();
if(!price_reg.test(bookPrice)){
alert("最少个位最多万位并且只能是正数或小数");
$("#bookPrice").val(null);
sub()
}else{
$("#bookPrice").val(keepTwoDecimalFull(bookPrice));
}
})
function sub(){
$("#sub").on("submit",function(){
return false;
})
}
//四舍五入保留2位小数（不够位数，则用0替补）
function keepTwoDecimalFull(num) {
var result = parseFloat(num);
if (isNaN(result)) {
alert('传递参数错误，请检查！');
return false;
}
result = Math.round(num * 100) / 100;
var s_x = result.toString();
var pos_decimal = s_x.indexOf('.');
if (pos_decimal < 0) {
pos_decimal = s_x.length;
s_x += '.';
}
while (s_x.length <= pos_decimal + 2) {
s_x += '0';
}
return s_x;
}
</script>
</body>
</html>
package com.imooc.servlet;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
/**
* Servlet implementation class BookList
*/
@WebServlet("/BookList")
public class BookList extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public BookList() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
DiskFileItemFactory dFactory=new DiskFileItemFactory();
ServletFileUpload sUpload=new ServletFileUpload(dFactory);
try {
List<FileItem> fList= sUpload.parseRequest(request);
for (FileItem fileItem : fList) {
if (fileItem.isFormField()) {
String name= fileItem.getFieldName();
String value=fileItem.getString("UTF-8");
System.out.println(name+"-"+value);
}else {
// 文件上传项
// 获得文件的名称:
String fileName = fileItem.getName();
System.out.println(fileName);
// 获得文件的输入流:
InputStream is = fileItem.getInputStream();
// 需要将文件写入到服务器的某个路径即可:
String path = getServletContext().getRealPath("/upload");
System.out.println(path);
// 创建输出流 与 输入流进行对接:
OutputStream os = new FileOutputStream(path+"\\"+fileName);
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();
}
}
}
1.文件写入不了
正在回答 回答被采纳积分+1
人呢，我重新写了一次还是false
相似问题
登录后可查看更多问答，登录/注册
- 参与学习 人
- 提交作业 676 份
- 解答问题 9666 个
本阶段将从前端网页搭建入手，到Java Web基础，前后端结合助你完成Java Web小白的蜕变！
了解课程
恭喜解决一个难题，获得1积分~
来为老师/同学的回答评分吧
0 星