SpringMVC上传文件

最新推荐文章于 2025-06-19 20:58:13 发布

原创最新推荐文章于 2025-06-19 20:58:13 发布 · 248 阅读

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本文介绍如何使用Spring MVC实现文件上传功能，并通过Java SDK将文件存储到Amazon S3上，包括Maven依赖配置、Spring配置、控制器实现及上传工具类。

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1、maven依赖（spring依赖省略）

<dependency>
   <groupId>com.amazonaws</groupId>
   <artifactId>aws-java-sdk-s3</artifactId>
   <version>1.10.76</version>
</dependency>

2、springmvc.xml配置

 <bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">   
         <property name="maxUploadSize"><value>100000</value></property> 
         <property name="defaultEncoding"><value>UTF-8</value></property> 
   </bean>

3、controller层

@RequestMapping(value = "upload", method = RequestMethod.POST)
@ResponseBody
public String upload(HttpServletRequest request, @RequestParam(value = "file") MultipartFile file) {
   return UploadUtils.upload(file);
}

4、上传至Amazon s3工具类（UploadUtils.java）

public static String upload(String userKey, MultipartFile file) {
   AWSCredentials credentials = new BasicAWSCredentials("amazons3.accessKey", "amazons3.secretKey");
   ClientConfiguration clientConfig = new ClientConfiguration();
   clientConfig.setProtocol(Protocol.HTTP);
   AmazonS3 s3 = new AmazonS3Client(credentials, clientConfig);
   s3.setEndpoint("amazons3.endpoint");
   String bucketName = "bucketname";
   String key = "img/" + userKey;
   URL url = null;
   try {
      if (!s3.doesBucketExist(bucketName)) {
         s3.createBucket(bucketName);
      }
      ObjectMetadata metadata = new ObjectMetadata();
      metadata.setContentLength(file.getSize());
      metadata.setContentType(file.getContentType());
      s3.putObject(new PutObjectRequest(bucketName, key, file.getInputStream(), metadata));
      s3.setObjectAcl(bucketName, key, CannedAccessControlList.PublicRead);

      GeneratePresignedUrlRequest urlRequest = new GeneratePresignedUrlRequest(bucketName, key);

      Date expirationDate = null;
      try {
         expirationDate = new SimpleDateFormat("yyyy-MM-dd").parse("2050-12-31");
      } catch (ParseException e) {
         e.printStackTrace();
      }
      urlRequest.setExpiration(expirationDate);
      url = s3.generatePresignedUrl(urlRequest);
   } catch (AmazonClientException | IOException e) {
      e.printStackTrace();
   }
   return url.toString();
}