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"Spring Learning note-mvc-13" Spring MVC file Upload

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SSSLINPPP 1. Summary Spring MVC provides the most direct support for file uploads, which is implemented through plug-and-play multipartresolve. Spring uses Jakarta Commons FileUpload technology to implement a Multipartresolver implementation class: Commonsmultipartresolver.
The following is a detailed explanation of how spring MVC implements file uploads. 2. Add a jar package to upload a Spring mvc file, you need to add the following two jar packages:
    1. Commons-fileupload-1.2.2.jar;
    2. Commons-io-2.0.1.jar
3. Configure Commonsmultipartresolver 
  
 
    
   
  
  1. 
  
  2. <!-- 文件上传 -->
    3. 
   
  
  3. 
  
  4. <bean id="multipartResolver"
    5. 
   
  
  5. 
  
  6. class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
    7. 
   
  
  7. 
  
  8. p:defaultEncoding="UTF-8" p:maxUploadSize="5000000" p:uploadTempDir="upload/temp" /> 
    9.
Description
    • P:defaultencoding= "UTF-8": here Set the default file encoding to UTF-8, must be consistent with the default encoding of the user JSP;
    • P:maxuploadsize= "5000000": Specify the file upload size, in bytes;
    • P:uploadtempdir= "upload/temp": File upload temporary directory, upload completed, the temporary files will be deleted;

4. Control Layer Code Front Desk Request: Http://localhost:8080/SpringMVCTest/test/uploadPage.action, return to the Uploadpage.jsp interface, as follows: 

  
 
    
   
  
  1. 
  
  2. @RequestMapping(value = "/upload")
    3. 
   
  
  3. 
  
  4. public String updateThumb(@RequestParam("name") String name,
    5. 
   
  
  5. 
  
  6. @RequestParam("file") MultipartFile file,
    7. 
   
  
  7. 
  
  8. HttpServletRequest request, ModelMap model) throws Exception {
    9. 
   
  
  9. 
  
  10. if (!file.isEmpty()) {
    11. 
   
  
  11. 
  
  12. // 保存文件-方式1 --测试过，可以用,必须先创建相应目录
    13. 
   
  
  13. 
  
  14. // file.transferTo(new File("d:/"+file.getOriginalFilename()));
    15. 
   
  
  15. 
  
    17. 
   
  
  17. 
  
  18. // 保存文件-方式2
    19. 
   
  
  19. 
  
  20. String path = request.getSession().getServletContext()
    21. 
   
  
  21. 
  
  22. .getRealPath("upload");
    23. 
   
  
  23. 
  
  24. String fileName = file.getOriginalFilename();
    25. 
   
  
  25. 
  
  26. File targetFile = new File(path, fileName);
    27. 
   
  
  27. 
  
  28. //目录不存在，则创建目录
    29. 
   
  
  29. 
  
  30. if(!targetFile.exists()){ 
    31. 
   
  
  31. 
  
  32.  targetFile.mkdirs(); 
    33. 
   
  
  33. 
  
  34.  } 
    35. 
   
  
  35. 
  
  36. //保存 
    37. 
   
  
  37. 
  
  38.  try { 
    39. 
   
  
  39. 
  
  40.  file.transferTo(targetFile); 
    41. 
   
  
  41. 
  
  42.  } catch (Exception e) { 
    43. 
   
  
  43. 
  
  44.  e.printStackTrace(); 
    45. 
   
  
  45. 
  
  46.  } 
    47. 
   
  
  47. 
  
  48.  model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName); 
    49. 
   
  
  49. 
  
  50. return "success";
    51. 
   
  
  51. 
  
  52. } else {
    53. 
   
  
  53. 
  
  54. return "fail";
    55. 
   
  
  55. 
  
  56. }
    57. 
   
  
  57. 
  
  58. }
    59.

5. File Upload JSP 
  
 
    
   
  
  1. 
  
  2. <%@ page language="java" contentType="text/html; charset=UTF-8"
    3. 
   
  
  3. 
  
  4. pageEncoding="UTF-8"%>
    5. 
   
  
  5. 
  
  6. <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    7. 
   
  
  7. 
  
    9. 
   
  
  9. 
  
    11. 
   
  
  11. 
  
  12. <title>请上传用户头像</title>
    13. 
   
  
  13. 
  
    15. 
   
  
  15. 
  
  16. <body>
    17. 
   
  
  17. 
  
  18. 请选择上传的头像文件
    19. 
   
  
  19. 
  
  20. <form method="post" action="<c:url value="/test/upload.action"/>"
    21. 
   
  
  21. 
  
  22. enctype="multipart/form-data">
    23. 
   
  
  23. 
  
  24. <input type="text" name="name" />
    25. 
   
  
  25. 
  
  26. <input type="file" name="file" />
    27. 
   
  
  27. 
  
  28. <input type="submit" />
    29. 
   
  
  29. 
  
  30. </form>
    31. 
   
  
  31. 
  
  32. </body>
    33. 
   
  
  33. 
  
    35.
Successfully returned interface:


6. Blogs HTTP://WWW.CNBLOGS.COM/SSSLINPPP Http://blog.sina.com.cn/spstudy



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    "Spring Learning note-mvc-13" Spring MVC file Upload

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