Web 开发中文件上传是出现的：java.io.FileNotFoundException: (文件名、目录名或卷标语法不正确。)

来源：互联网发布：淘宝网虎皮鹦鹉窝编辑：程序博客网时间：2024/04/27 19:20

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);"></span>

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);"><span style="color:#ff0000;">一 环境的搭建：</span></span>

eclipase + javaEE + commons-fileupload-1.2.1.jar + commons-io-2.0.jar + tomcat 7.0.68

二文件上传的servlet 代码实现！

package com.baidu.fileupload.servlet;import java.io.File;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.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;@WebServlet("/uploadServlet")public class UploadServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {DiskFileItemFactory factory = new DiskFileItemFactory();factory.setSizeThreshold(1024*500);File tempDirectory = new File("d:\\tempDirectory");factory.setRepository(tempDirectory);ServletFileUpload upload = new ServletFileUpload(factory);try {List<FileItem> items = upload.parseRequest(request);for(FileItem item:items){if(item.isFormField()){String name = item.getFieldName();String value = item.getString();System.out.println( name + " : " + value);}else{String fieldName = item.getFieldName();    String fileName = item.getName();    String contentType = item.getContentType();    long sizeInBytes = item.getSize();        System.out.println(fieldName);    System.out.println(fileName);    System.out.println(contentType);    System.out.println(sizeInBytes);         InputStream in = item.getInputStream();    byte[] buffer = new byte[1024];    int len = 0;        fileName = "d:\\files\\" + fileName;     System.out.println(fileName);         OutputStream out = new FileOutputStream(fileName);        while((len = in.read(buffer)) != -1){    out.write(buffer, 0, len);        }    out.close();    in.close();}}} catch (FileUploadException e) {e.printStackTrace();}}}

三 JSP 编写

update.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><form action="uploadServlet" method="post" enctype="multipart/form-data">File: <input  type="file" name="file"  />  <br><br>  <br><br>DESC: <input  type="text" name="desc"  />  <br><br>  <br><br><input  type="submit" value="Submit"  /></form></body></html>

四，运行过程中出现的问题

五，解决的办法：

进过一番百度，无意中看到一位朋友提到，不同的浏览器对上传的文件名的处理方式不太一样，进过一番实验，搞定，且增加了一行代码！

package com.baidu.fileupload.servlet;import java.io.File;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.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;@WebServlet("/uploadServlet")public class UploadServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {DiskFileItemFactory factory = new DiskFileItemFactory();factory.setSizeThreshold(1024*500);File tempDirectory = new File("d:\\tempDirectory");factory.setRepository(tempDirectory);ServletFileUpload upload = new ServletFileUpload(factory);upload.setSizeMax(1024 * 1024 * 5);try {List<FileItem> items = upload.parseRequest(request);for(FileItem item:items){if(item.isFormField()){String name = item.getFieldName();String value = item.getString();System.out.println( name + " : " + value);}else{String fieldName = item.getFieldName();    String fileName = item.getName();    String contentType = item.getContentType();    long sizeInBytes = item.getSize();        System.out.println(fieldName);    System.out.println(fileName);    System.out.println(contentType);    System.out.println(sizeInBytes);                    //不同的浏览器提交的文件名是不一样的，有些浏览器提交的文件名是带有路径的，如：c:\nihao\a.txt，而有些只是单纯的文件名，如：a.txt               //处理获取到的上传文件的文件名的路径部分，只保留文件名部分    fileName = fileName.substring(fileName.lastIndexOf("\\")+1);        InputStream in = item.getInputStream();    byte[] buffer = new byte[1024];    int len = 0;        fileName = "d:\\files\\" + fileName;     System.out.println(fileName);         OutputStream out = new FileOutputStream(fileName);        while((len = in.read(buffer)) != -1){    out.write(buffer, 0, len);        }    out.close();    in.close();}}} catch (FileUploadException e) {e.printStackTrace();}}}

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Web 开发中 文件上传 是出现的：java.io.FileNotFoundException: (文件名、目录名或卷标语法不正确。)

Web 开发中文件上传是出现的：java.io.FileNotFoundException: (文件名、目录名或卷标语法不正确。)