问题春AJAX文件上传

Question

我有一个简单的形式，同时可以选择上传图片，但上传的文件，我不使用这种方法

<form:input path="logoData" id="image" type="file" /> 

，而不是我使用ajax upload jquery pulgin。 问题是upload.parseRequest（请求）在下面的代码返回null：日志

@RequestMapping(value = "/upload.htm", method = RequestMethod.POST) 
public @ResponseBody String upload(HttpServletRequest request) throws FileUploadException{ 

    // Create a factory for disk-based file items 
    FileItemFactory factory = new DiskFileItemFactory(); 

    // Create a new file upload handler 
    ServletFileUpload upload = new ServletFileUpload(factory); 

    // Parse the request 
    List<FileItem> items = upload.parseRequest(request); 
    System.out.println("====ITEMS====" + items.size()); 


    System.out.println("----REQUEST---" +request.getParameter("uploadImg")); 
     System.out.println("-----SIZE----" +request.getParameterMap().size()); 
     Map<String, String> map = request.getParameterMap(); 

     for(Map.Entry<String, String> entry : map.entrySet()){ 
      System.out.println("----KEY---" + entry.getKey() + "----value---" + entry.getValue()); 
     } 


// Check that we have a file upload request 
    boolean isMultipart = ServletFileUpload.isMultipartContent(request); 

    System.out.println("----IS MULTIPART---" +isMultipart); 
    return "hello"; 
} 

输出是：

==== ITEMS ==== 0
---- REQUEST ---空
----- SIZE ---- 0
---- IS MULTIPART ---真正

我的JavaScript代码：

new AjaxUpload('#upload', { 
action : my_url+ 'methodName/upload.htm', 
name : 'uploadImg', 
autoSubmit : true, 
responseType: 'html', 
onChange: function(file, extension){ }, 
onSubmit: function(file, extension) { 

}, 
onComplete: function(file, html) { 
    alert(file); 
    alert(html); 

} 

}）;

IS MULTIPART显示为真，但如何获取文件名以及如何存储它。我已经尝试了一个没有Ajax的例子，它使用数据类型CommonsMultipartFile工作正常。 另外我已经在PHP中使用了ajaxupload，并且我得到的文件名为$ _FILES ['image'] ['name']但在java中没有任何想法，因为我是java新手。 我在这个网站上关注了我的类似问题，但没有成功。

谢谢。

Answer 1

可以缩短。你需要一个多部分解析器：

<bean id="multipartResolver" 
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 

    <!-- one of the properties available; the maximum file size in bytes --> 
    <property name="maxUploadSize" value="100000"/> 
</bean> 

然后：

@Controller 
public class FileUpoadController { 

    @RequestMapping(value = "/form", method = RequestMethod.POST) 
    public String handleFormUpload(@RequestParam("file") MultipartFile file) { 

     if (!file.isEmpty()) { 
      byte[] bytes = file.getBytes(); 
      // store the bytes somewhere 
      return "redirect:uploadSuccess"; 
     } else { 
      return "redirect:uploadFailure"; 
     } 
    } 

} 

Answer 2

@RequestMapping(value = "/imageUpload", method = RequestMethod.POST) 
public String handleFormUpload(@RequestParam("file") MultipartFile file) { 

    if (!file.isEmpty()) { 

      System.out.println("File name:"+ file.getOriginalFilename()); 
      //byte[] bytes = file.getBytes(); 
      System.out.println("Content type:"+ file.getContentType()); 
      String [] contentType = file.getContentType().split("/"); 
      String fileType = contentType[contentType.length-1]; 
      System.out.println("File type:"+ fileType); 
      System.out.println("File size:"+ (file.getSize()/1024) + "KB"); 

      String path = context.getRealPath("/resources/images/"); 
      System.out.println("Path: " + path); 



      InputStream inputStream = null; 
      OutputStream outputStream = null; 
      try { 
       inputStream = file.getInputStream(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      try { 
       outputStream = new FileOutputStream(path + file.getOriginalFilename()); 
      } catch (FileNotFoundException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

      int readBytes = 0; 
      byte[] buffer = new byte[8192]; 
      try { 
       while ((readBytes = inputStream.read(buffer, 0, 8192)) != -1) { 
          outputStream.write(buffer, 0, readBytes); 
       } 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      try { 
       outputStream.close(); 
       inputStream.close(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 


      // store the bytes somewhere 
      return "theme"; 
    } 
    else 
     return "uploadError"; 

}