Spring MVC Implementation of File Upload and Download Functionality

This article shares the specific code for implementing file upload and download functions in spring mvc, for your reference. The specific content is as follows

File upload

Introduce spring mvc and commons in pom.xml-related jar for fileupload

  <!-- spring mvc -->
  dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-webmvc</artifactId>
   <version>4.3.13.RELEASE</version>
  </dependency>
  <!-- File upload and download -->
  dependency>
   <groupId>commons-fileupload</groupId>
   <artifactId>commons-fileupload</artifactId>
   <version>1.3.3</version>
  </dependency>

Add file upload related configurations in the springmvc.xml

 <bean id="multipartResolver" 
  class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 
  <!-- The maximum file upload size, unit in bytes (10MB) -->
  <property name="maxUploadSize"> 
   <value>10485760</value> 
  </property> 
  <!-- The request encoding format must be consistent with the jSP's pageEncoding attribute to correctly read the form content, the default is ISO-8859-1 -->
  <property name="defaultEncoding">
   <value>UTF-8</value>
  </property>
 </bean>

Add a form tag in the jsp file

<form action="upload" enctype="multipart/form-data" method="post">
 <table>
  <tr>
   <td>File description: </td>
   <td><input type="text" name="description"></td>
  </tr>
  <tr>
   <td>Select file: </td>
   <td><input type="file" name="file"></td>
  </tr>
  <tr>
   <td><input type="submit" value="Upload"></td>
  </tr>
 </table>
</form>

Add a file upload method

//The uploaded file will be automatically bound to MultipartFile
@RequestMapping(value = "/upload", method = RequestMethod.POST)
public String upload(HttpServletRequest request,
  @RequestParam("description") String description,
  @RequestParam("file") MultipartFile file) throws Exception {
 //If the file is not empty, write the upload path
 if(!file.isEmpty()) {
  //Uploaded file path
  String path = request.getServletContext().getRealPath("/file/");
  //Uploaded file name
  String filename = file.getOriginalFilename();
  File filepath = new File(path,filename);
  //Check if the path exists, and create one if it does not
  if (!filepath.getParentFile().exists()) {
   filepath.getParentFile().mkdirs();
  }
  //Save the uploaded file to a target file
  file.transferTo(new File(path + File.separator + filename));
  return "success";
 }
  return "error";
 }
}

That's all for this article. I hope it will be helpful to everyone's learning and that everyone will support the Yelling Tutorial more.

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