老师，我的文件上传没反应，在判断是表单项还是文件上传项的时候没走else

package org.imooc.Servlet;

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.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

public class ImportExcelServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("Servlet成功调用");
if (ServletFileUpload.isMultipartContent(req)) {
ServletFileUpload upload = new ServletFileUpload(new DiskFileItemFactory());
upload.setHeaderEncoding("UTF-8");
try {
List<FileItem> fileItemList = upload.parseRequest(req);
for (FileItem fileItem : fileItemList) {
if (fileItem.isFormField()) {
System.out.println("是表单项");
System.out.println(fileItem.getFieldName() + "," + fileItem.getString("UTF-8"));
} else {
System.out.println("是文件上传项");
System.out.println(fileItem.getFieldName());
fileItem.write(new File("d:/Upload/" + fileItem.getName()));
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}catch (Exception e){
e.printStackTrace();
}

}
}

}

李成大独秀 2018-08-08

源自：项目：Java导入导出 2-3 导入Excel-1

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3回答

一叶知秋519 回答被采纳获得+3积分 2018-08-09 16:18:55

页面中上传文件项，给input框增加一个name后再试下~

即：<input type="file" name="excel" style="width:100%;"/>

祝学习愉快！

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李成大独秀提问者 #1

添加后报了个文件未定义的异常，在文件夹里没有上传的文件，我把else中的代码改为如下后，问题解决 // 是文件上传项 // 获得有效文件名 filename=fileItem.getName().substring(fileItem.getName().lastIndexOf("\\")); // 把文件存入指定位置 fileItem.write(new File("d:/Upload/" + filename));

2018-08-09 19:22:39

提问者李成大独秀 2018-08-09 13:26:05

打印fileItemList的值如下

[name=null, StoreLocation=D:\Tomcat\apache-tomcat-9.0.8\temp\upload_656a418a_6fbb_4f55_9c4f_f88aa2ab58fb_00000000.tmp, size=12 bytes, isFormField=true, FieldName=title]

jsp代码如下：

<%@page language="java" contentType="text/html; UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9; IE=8; IE=7; IE=EDGE"/>
<title></title>
<link rel="stylesheet" type="text/css" href="css/all.css"/>
<link rel="stylesheet" type="text/css" href="css/pop.css"/>
<link rel="stylesheet" type="text/css" href="css/main.css"/>
</head>
<body style="background: #e1e9eb;">
<form id="mainForm" method="post" enctype="multipart/form-data" action="${basePath}/importExcelServlelt">
<div class="right">
<div class="current">当前位置：<a href="###">导入/导出</a> > 导入Excel</div>
<div class="rightCont">
<p class="g_title fix">导入</p>
<table class="tab1" width="100%">
<tbody>
<tr>
<td align="right" width="10%" name="title">标题<font color="red">*</font>：</td>
<td width="30%">
<input id="title" name="title" class="allInput" style="width:100%;" type="text"/>
</td>
<td align="right" width="10%" name="excel">选择文件<font color="red">*</font>：</td>
<td width="30%">
<input type="file" style="width:100%;"/>
</td>
</tr>
</tbody></table>
<div style="text-align: center; margin-top: 30px;">
<input class="tabSub" value="导入" onclick="document.getElementById('mainForm').submit()" type="button" />
</div>
</div>
</div>
</form>
</body>
</html>