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。)

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本文介绍了一个使用Eclipse、Java EE及Apache Commons库实现文件上传的示例。通过配置Servlet和编写上传逻辑，演示了如何处理不同浏览器上传的文件名差异，并提供了解决方案。

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<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();
		}
	}
}