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。) 



    

  1. 

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

    2. 

  2. 

    </span>
    

    3. 





<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！


 


 




    

  1. 

    package com.baidu.fileupload.servlet;
    

    2. 

  2. 

  3. 

    import java.io.File;
    

    4. 

  4. 

    import java.io.FileOutputStream;
    

    5. 

  5. 

    import java.io.IOException;
    

    6. 

  6. 

    import java.io.InputStream;
    

    7. 

  7. 

    import java.io.OutputStream;
    

    8. 

  8. 

    import java.util.List;
    

    9. 

  9. 

  10. 

    import javax.servlet.ServletException;
    

    11. 

  11. 

    import javax.servlet.annotation.WebServlet;
    

    12. 

  12. 

    import javax.servlet.http.HttpServlet;
    

    13. 

  13. 

    import javax.servlet.http.HttpServletRequest;
    

    14. 

  14. 

    import javax.servlet.http.HttpServletResponse;
    

    15. 

  15. 

  16. 

    import org.apache.commons.fileupload.FileItem;
    

    17. 

  17. 

    import org.apache.commons.fileupload.FileUploadException;
    

    18. 

  18. 

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

    19. 

  19. 

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

    20. 

  20. 

  21. 

    @WebServlet("/uploadServlet")
    

    22. 

  22. 

    public class UploadServlet extends HttpServlet {
    

    23. 

  23. 

  24. 

    private static final long serialVersionUID = 1L;
    

    25. 

  25. 

  26. 

    protected void doPost(HttpServletRequest request, 
    

    27. 

  27. 

    HttpServletResponse response) throws ServletException, IOException {
    

    28. 

  28. 

  29. 

  30. 

    DiskFileItemFactory factory = new DiskFileItemFactory();
    

    31. 

  31. 

  32. 

  33. 

    factory.setSizeThreshold(1024*500);
    

    34. 

  34. 

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

    35. 

  35. 

    factory.setRepository(tempDirectory);
    

    36. 

  36. 

  37. 

    ServletFileUpload upload = new ServletFileUpload(factory);
    

    38. 

  38. 

  39. 

    try {
    

    40. 

  40. 

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

    41. 

  41. 

    for(FileItem item:items){
    

    42. 

  42. 

    if(item.isFormField()){
    

    43. 

  43. 

    String name = item.getFieldName();
    

    44. 

  44. 

    String value = item.getString();
    

    45. 

  45. 

  46. 

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

    47. 

  47. 

    }else{
    

    48. 

  48. 

    String fieldName = item.getFieldName();
    

    49. 

  49. 

    String fileName = item.getName();
    

    50. 

  50. 

    String contentType = item.getContentType();
    

    51. 

  51. 

    long sizeInBytes = item.getSize();
    

    52. 

  52. 

  53. 

    System.out.println(fieldName);
    

    54. 

  54. 

    System.out.println(fileName);
    

    55. 

  55. 

    System.out.println(contentType);
    

    56. 

  56. 

    System.out.println(sizeInBytes);
    

    57. 

  57. 

  58. 

  59. 

    InputStream in = item.getInputStream();
    

    60. 

  60. 

    byte[] buffer = new byte[1024];
    

    61. 

  61. 

    int len = 0;
    

    62. 

  62. 

  63. 

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

    64. 

  64. 

    System.out.println(fileName);
    

    65. 

  65. 

  66. 

    OutputStream out = new FileOutputStream(fileName);
    

    67. 

  67. 

  68. 

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

    69. 

  69. 

    out.write(buffer, 0, len);
    

    70. 

  70. 

  71. 

    }
    

    72. 

  72. 

    out.close();
    

    73. 

  73. 

    in.close();
    

    74. 

  74. 

    }
    

    75. 

  75. 

    }
    

    76. 

  76. 

  77. 

    } catch (FileUploadException e) {
    

    78. 

  78. 

    e.printStackTrace();
    

    79. 

  79. 

    }
    

    80. 

  80. 

    }
    

    81. 

  81. 

    }
    

    82. 




三  JSP 编写


update.jsp


 




    

  1. 

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

    2. 

  2. 

    pageEncoding="UTF-8"%>
    

    3. 

  3. 

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

    4. 

  4. 

    <html>
    

    5. 

  5. 

    <head>
    

    6. 

  6. 

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

    7. 

  7. 

    <title>Insert title here</title>
    

    8. 

  8. 

    </head>
    

    9. 

  9. 

    <body>
    

    10. 

  10. 

  11. 

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

    12. 

  12. 

  13. 

  14. 

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

    15. 

  15. 

    <br><br> 
    

    16. 

  16. 

    <br><br> 
    

    17. 

  17. 

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

    18. 

  18. 

    <br><br> 
    

    19. 

  19. 

    <br><br> 
    

    20. 

  20. 

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

    21. 

  21. 

    </form> 
    

    22. 

  22. 

  23. 

    </body>
    

    24. 

  24. 

    </html>
    

    25. 



 


 


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;
    

    2. 

  2. 

  3. 

    import java.io.File;
    

    4. 

  4. 

    import java.io.FileOutputStream;
    

    5. 

  5. 

    import java.io.IOException;
    

    6. 

  6. 

    import java.io.InputStream;
    

    7. 

  7. 

    import java.io.OutputStream;
    

    8. 

  8. 

    import java.util.List;
    

    9. 

  9. 

  10. 

    import javax.servlet.ServletException;
    

    11. 

  11. 

    import javax.servlet.annotation.WebServlet;
    

    12. 

  12. 

    import javax.servlet.http.HttpServlet;
    

    13. 

  13. 

    import javax.servlet.http.HttpServletRequest;
    

    14. 

  14. 

    import javax.servlet.http.HttpServletResponse;
    

    15. 

  15. 

  16. 

    import org.apache.commons.fileupload.FileItem;
    

    17. 

  17. 

    import org.apache.commons.fileupload.FileUploadException;
    

    18. 

  18. 

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

    19. 

  19. 

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

    20. 

  20. 

  21. 

    @WebServlet("/uploadServlet")
    

    22. 

  22. 

    public class UploadServlet extends HttpServlet {
    

    23. 

  23. 

  24. 

    private static final long serialVersionUID = 1L;
    

    25. 

  25. 

  26. 

    protected void doPost(HttpServletRequest request, 
    

    27. 

  27. 

    HttpServletResponse response) throws ServletException, IOException {
    

    28. 

  28. 

  29. 

  30. 

    DiskFileItemFactory factory = new DiskFileItemFactory();
    

    31. 

  31. 

  32. 

  33. 

    factory.setSizeThreshold(1024*500);
    

    34. 

  34. 

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

    35. 

  35. 

    factory.setRepository(tempDirectory);
    

    36. 

  36. 

  37. 

    ServletFileUpload upload = new ServletFileUpload(factory);
    

    38. 

  38. 

  39. 

    upload.setSizeMax(1024 * 1024 * 5);
    

    40. 

  40. 

  41. 

    try {
    

    42. 

  42. 

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

    43. 

  43. 

    for(FileItem item:items){
    

    44. 

  44. 

    if(item.isFormField()){
    

    45. 

  45. 

    String name = item.getFieldName();
    

    46. 

  46. 

    String value = item.getString();
    

    47. 

  47. 

  48. 

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

    49. 

  49. 

    }else{
    

    50. 

  50. 

    String fieldName = item.getFieldName();
    

    51. 

  51. 

    String fileName = item.getName();
    

    52. 

  52. 

    String contentType = item.getContentType();
    

    53. 

  53. 

    long sizeInBytes = item.getSize();
    

    54. 

  54. 

  55. 

    System.out.println(fieldName);
    

    56. 

  56. 

    System.out.println(fileName);
    

    57. 

  57. 

    System.out.println(contentType);
    

    58. 

  58. 

    System.out.println(sizeInBytes);
    

    59. 

  59. 

  60. 

    //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
    

    61. 

  61. 

    //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. 

  62. 

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

    63. 

  63. 

  64. 

    InputStream in = item.getInputStream();
    

    65. 

  65. 

    byte[] buffer = new byte[1024];
    

    66. 

  66. 

    int len = 0;
    

    67. 

  67. 

  68. 

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

    69. 

  69. 

    System.out.println(fileName);
    

    70. 

  70. 

  71. 

    OutputStream out = new FileOutputStream(fileName);
    

    72. 

  72. 

  73. 

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

    74. 

  74. 

    out.write(buffer, 0, len);
    

    75. 

  75. 

  76. 

    }
    

    77. 

  77. 

    out.close();
    

    78. 

  78. 

    in.close();
    

    79. 

  79. 

    }
    

    80. 

  80. 

    }
    

    81. 

  81. 

  82. 

    } catch (FileUploadException e) {
    

    83. 

  83. 

    e.printStackTrace();
    

    84. 

  84. 

    }
    

    85. 

  85. 

    }
    

    86. 

  86. 

    }
    

    87. 



 


 


 


 


显示推荐内容







		

		
posted @ 
2019-08-30 16:48 
那些年的代码 
阅读(798) 
评论(0) 
编辑 
收藏 
举报