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！

 

 

1. package com.baidu.fileupload.servlet;

3. import java.io.File;

4. import java.io.FileOutputStream;

5. import java.io.IOException;

6. import java.io.InputStream;

7. import java.io.OutputStream;

8. import java.util.List;

10. import javax.servlet.ServletException;

11. import javax.servlet.annotation.WebServlet;

12. import javax.servlet.http.HttpServlet;

13. import javax.servlet.http.HttpServletRequest;

14. import javax.servlet.http.HttpServletResponse;

16. import org.apache.commons.fileupload.FileItem;

17. import org.apache.commons.fileupload.FileUploadException;

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

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

21. @WebServlet("/uploadServlet")

22. public class UploadServlet extends HttpServlet {

24. private static final long serialVersionUID = 1L;

26. protected void doPost(HttpServletRequest request,

27. HttpServletResponse response) throws ServletException, IOException {

30. DiskFileItemFactory factory = new DiskFileItemFactory();

33. factory.setSizeThreshold(1024*500);

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

35. factory.setRepository(tempDirectory);

37. ServletFileUpload upload = new ServletFileUpload(factory);

39. try {

40. List items = upload.parseRequest(request);

41. for(FileItem item:items){

42. if(item.isFormField()){

43. String name = item.getFieldName();

44. String value = item.getString();

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

47. }else{

48. String fieldName = item.getFieldName();

49. String fileName = item.getName();

50. String contentType = item.getContentType();

51. long sizeInBytes = item.getSize();

53. System.out.println(fieldName);

54. System.out.println(fileName);

55. System.out.println(contentType);

56. System.out.println(sizeInBytes);

59. InputStream in = item.getInputStream();

60. byte[] buffer = new byte[1024];

61. int len = 0;

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

64. System.out.println(fileName);

66. OutputStream out = new FileOutputStream(fileName);

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

69. out.write(buffer, 0, len);

71. }

72. out.close();

73. in.close();

74. }

75. }

77. } catch (FileUploadException e) {

78. e.printStackTrace();

79. }

80. }

81. }

三  JSP 编写

update.jsp

 

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

2. pageEncoding="UTF-8"%>

14. File:

15. 



16. 



17. DESC:

18. 



19. 



 

 

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;

3. import java.io.File;

4. import java.io.FileOutputStream;

5. import java.io.IOException;

6. import java.io.InputStream;

7. import java.io.OutputStream;

8. import java.util.List;

10. import javax.servlet.ServletException;

11. import javax.servlet.annotation.WebServlet;

12. import javax.servlet.http.HttpServlet;

13. import javax.servlet.http.HttpServletRequest;

14. import javax.servlet.http.HttpServletResponse;

16. import org.apache.commons.fileupload.FileItem;

17. import org.apache.commons.fileupload.FileUploadException;

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

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

21. @WebServlet("/uploadServlet")

22. public class UploadServlet extends HttpServlet {

24. private static final long serialVersionUID = 1L;

26. protected void doPost(HttpServletRequest request,

27. HttpServletResponse response) throws ServletException, IOException {

30. DiskFileItemFactory factory = new DiskFileItemFactory();

33. factory.setSizeThreshold(1024*500);

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

35. factory.setRepository(tempDirectory);

37. ServletFileUpload upload = new ServletFileUpload(factory);

39. upload.setSizeMax(1024 * 1024 * 5);

41. try {

42. List items = upload.parseRequest(request);

43. for(FileItem item:items){

44. if(item.isFormField()){

45. String name = item.getFieldName();

46. String value = item.getString();

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

49. }else{

50. String fieldName = item.getFieldName();

51. String fileName = item.getName();

52. String contentType = item.getContentType();

53. long sizeInBytes = item.getSize();

55. System.out.println(fieldName);

56. System.out.println(fileName);

57. System.out.println(contentType);

58. System.out.println(sizeInBytes);

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

64. InputStream in = item.getInputStream();

65. byte[] buffer = new byte[1024];

66. int len = 0;

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

69. System.out.println(fileName);

71. OutputStream out = new FileOutputStream(fileName);

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

74. out.write(buffer, 0, len);

76. }

77. out.close();

78. in.close();

79. }

80. }

82. } catch (FileUploadException e) {

83. e.printStackTrace();

84. }

85. }

86. }

 

 

 

 

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