上传文件时报（文件名、目录名或卷标语法不正确）原因调查

时间：2021-11-21 19:13:58

举例说明：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPEhtml PUBLIC "-//W3C//DTDHTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<metahttp-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>upload file</title>
</head>
<body>
<form action="GetPost" method="post" enctype="multipart/form-data">
    <input name="name" type="text">
    <input name="sex" type="text">
    <input name="file" type="file">
    <input type="submit" value="提交">
</form>
</body>
</html>
package com.servlet;

import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**

 * Servlet implementation class GetPost

 */

public class GetPost extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException {
        String name = request.getParameter("name");
        String sex = request.getParameter("sex");

        System.out.println("name = " + name);
        System.out.println("sex = " + sex);
    }

    protected void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException {
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
        if (isMultipart) {
            String dir =request.getSession().getServletContext().getRealPath("/upload");
            // String dir = "C:/upload";
            File dirFile = new File(dir);
            if (!dirFile.exists()) {
                dirFile.mkdirs();
            }

            try {
                FileItemFactory factory = newDiskFileItemFactory();
                ServletFileUpload fileUpload = newServletFileUpload(factory);
                @SuppressWarnings("unchecked")
                List<FileItem> items = fileUpload.parseRequest(request);
                for (FileItem item : items) {
                    //不是文件类型
                    if (item.isFormField()) {
                        String name =item.getFieldName();
                        String value =item.getString();

                        System.out.println(name +" = " + value);
                    } else {
                        //文件类型
                        System.out.println(dir);
                        System.out.println(item.getName());

                        String longFileName = item.getName();
                        char indexChar = '\\';
                        String fileName = item.getName().substring(longFileName.lastIndexOf(indexChar) + 1,
							longFileName.length());

                        System.out.println(fileName);
                        //注：如果fileName带路径，则会报错（文件名、目录名或卷标语法不正确）
                        //如：fileName = “C:/upload/xxx.txt”就会报错，此时可以截取fileName的最后一部分，结果就不会再报错
                        File saveFile = new File(dirFile,fileName);
                        item.write(saveFile);
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        doGet(request, response);
    }
}

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