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。)

时间：2022-06-01 20:33:52

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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

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。)

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

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。)


 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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