• 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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      <span style="font-family: Arial, Helvetica, sans-serif; ">
      

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      </span>
      

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    <span style="font-family: Arial, Helvetica, sans-serif; "><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！
    



    

      

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      package com.baidu.fileupload.servlet;
      

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      import java.io.File;
      

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      import java.io.FileOutputStream;
      

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      import java.io.IOException;
      

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      import java.io.InputStream;
      

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      import java.io.OutputStream;
      

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      import java.util.List;
      

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      import javax.servlet.ServletException;
      

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      import javax.servlet.annotation.WebServlet;
      

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      import javax.servlet.http.HttpServlet;
      

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      import javax.servlet.http.HttpServletRequest;
      

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      import javax.servlet.http.HttpServletResponse;
      

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      import org.apache.commons.fileupload.FileItem;
      

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      import org.apache.commons.fileupload.FileUploadException;
      

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      import org.apache.commons.fileupload.disk.DiskFileItemFactory;
      

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      import org.apache.commons.fileupload.servlet.ServletFileUpload;
      

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      @WebServlet("/uploadServlet")
      

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      public class UploadServlet extends HttpServlet {
      

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      private static final long serialVersionUID = 1L;
      

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      protected void doPost(HttpServletRequest request, 
      

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      HttpServletResponse response) throws ServletException, IOException {
      

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      DiskFileItemFactory factory = new DiskFileItemFactory();
      

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      factory.setSizeThreshold(1024*500);
      

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      File tempDirectory = new File("d:\tempDirectory");
      

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      factory.setRepository(tempDirectory);
      

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      ServletFileUpload upload = new ServletFileUpload(factory);
      

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      try {
      

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      List<FileItem> items = upload.parseRequest(request);
      

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      for(FileItem item:items){
      

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      if(item.isFormField()){
      

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      String name = item.getFieldName();
      

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      String value = item.getString();
      

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      System.out.println( name + " : " + value);
      

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      }else{
      

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      String fieldName = item.getFieldName();
      

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      String fileName = item.getName();
      

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      String contentType = item.getContentType();
      

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      long sizeInBytes = item.getSize();
      

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      System.out.println(fieldName);
      

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      System.out.println(fileName);
      

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      System.out.println(contentType);
      

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      System.out.println(sizeInBytes);
      

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      InputStream in = item.getInputStream();
      

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      byte[] buffer = new byte[1024];
      

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      int len = 0;
      

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      fileName = "d:\files\" + fileName;
      

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      System.out.println(fileName);
      

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      OutputStream out = new FileOutputStream(fileName);
      

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      while((len = in.read(buffer)) != -1){
      

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      out.write(buffer, 0, len);
      

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      }
      

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      out.close();
      

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      in.close();
      

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      }
      

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      }
      

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      } catch (FileUploadException e) {
      

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      e.printStackTrace();
      

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      }
      

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      }
      

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      }
      

      82. 

    


    三  JSP 编写
    

    update.jsp
    


    

      

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      <%@ page language="java" contentType="text/html; charset=UTF-8"
      

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      pageEncoding="UTF-8"%>
      

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      <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
      

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      <html>
      

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      <head>
      

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      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      

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      <title>Insert title here</title>
      

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      </head>
      

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      <body>
      

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      <form action="uploadServlet" method="post" enctype="multipart/form-data">
      

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      File: <input type="file" name="file" />
      

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      <br><br> 
      

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      <br><br> 
      

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      DESC: <input type="text" name="desc" />
      

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      <br><br> 
      

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      <br><br> 
      

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      <input type="submit" value="Submit" />
      

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      </form> 
      

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      </body>
      

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      </html>
      

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    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！
    


    

      

    1. 

      package com.baidu.fileupload.servlet;
      

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    2. 

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      import java.io.File;
      

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      import java.io.FileOutputStream;
      

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      import java.io.IOException;
      

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      import java.io.InputStream;
      

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      import java.io.OutputStream;
      

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      import java.util.List;
      

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      import javax.servlet.ServletException;
      

      11. 

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      import javax.servlet.annotation.WebServlet;
      

      12. 

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      import javax.servlet.http.HttpServlet;
      

      13. 

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      import javax.servlet.http.HttpServletRequest;
      

      14. 

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      import javax.servlet.http.HttpServletResponse;
      

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      import org.apache.commons.fileupload.FileItem;
      

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      import org.apache.commons.fileupload.FileUploadException;
      

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      import org.apache.commons.fileupload.disk.DiskFileItemFactory;
      

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      import org.apache.commons.fileupload.servlet.ServletFileUpload;
      

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      @WebServlet("/uploadServlet")
      

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      public class UploadServlet extends HttpServlet {
      

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      private static final long serialVersionUID = 1L;
      

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      protected void doPost(HttpServletRequest request, 
      

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      HttpServletResponse response) throws ServletException, IOException {
      

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      DiskFileItemFactory factory = new DiskFileItemFactory();
      

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      factory.setSizeThreshold(1024*500);
      

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      File tempDirectory = new File("d:\tempDirectory");
      

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      factory.setRepository(tempDirectory);
      

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      ServletFileUpload upload = new ServletFileUpload(factory);
      

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      upload.setSizeMax(1024 * 1024 * 5);
      

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      try {
      

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      List<FileItem> items = upload.parseRequest(request);
      

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      for(FileItem item:items){
      

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      if(item.isFormField()){
      

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      String name = item.getFieldName();
      

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      String value = item.getString();
      

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      System.out.println( name + " : " + value);
      

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      }else{
      

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      String fieldName = item.getFieldName();
      

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      String fileName = item.getName();
      

      52. 

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      String contentType = item.getContentType();
      

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      long sizeInBytes = item.getSize();
      

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      System.out.println(fieldName);
      

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      System.out.println(fileName);
      

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      System.out.println(contentType);
      

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      System.out.println(sizeInBytes);
      

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      //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:
ihaoa.txt，而有些只是单纯的文件名，如：a.txt
      

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      //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
      

      62. 

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      fileName = fileName.substring(fileName.lastIndexOf("\")+1);
      

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      InputStream in = item.getInputStream();
      

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      byte[] buffer = new byte[1024];
      

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      int len = 0;
      

      67. 

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      fileName = "d:\files\" + fileName;
      

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      System.out.println(fileName);
      

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      OutputStream out = new FileOutputStream(fileName);
      

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      while((len = in.read(buffer)) != -1){
      

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      out.write(buffer, 0, len);
      

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      }
      

      77. 

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      out.close();
      

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      in.close();
      

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      }
      

      80. 

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      }
      

      81. 

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      } catch (FileUploadException e) {
      

      83. 

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      e.printStackTrace();
      

      84. 

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      }
      

      85. 

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      }
      

      86. 

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      }
      

      87. 

    





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            原文地址：https://www.cnblogs.com/zhuyeshen/p/11435869.html
          
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