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。)

一 环境的搭建：

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 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"%>







		
	

	
	
		File: 
			  

		
			  

		
		DESC: 
			  

		
			  

		
			
	
	
		

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 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();
		}
	}
}