使用Spring MVC保存文件

@Bean
public CommonsMultipartResolver multipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setDefaultEncoding("utf-8");
    return resolver;
}

@Bean
public MultipartConfigElement multipartConfigElement() {
    MultipartConfigFactory factory = new MultipartConfigFactory();
    factory.setMaxFileSize("1024MB");
    factory.setMaxRequestSize("1024MB");
    return factory.createMultipartConfig();
}

@PostMapping("/upload")
public ResponseEntity<?> handleFileUpload(@RequestParam("file") MultipartFile file) {
    if (file.isEmpty()) {
        return new ResponseEntity<>("请上传文件", HttpStatus.BAD_REQUEST);
    }

    try {
        // 保存文件到本地文件系统
        Files.copy(file.getInputStream(), Paths.get(uploadPath + "/" + file.getOriginalFilename()));
        return new ResponseEntity<>("文件上传成功", HttpStatus.OK);
    } catch (IOException e) {
        e.printStackTrace();
        return new ResponseEntity<>("文件上传失败", HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

   <groupId>com.qcloud</groupId>
   <artifactId>cos_api</artifactId>
   <version>1.0.0</version>
</dependency>

import com.qcloud.cos.COSClient;
import com.qcloud.cos.ClientConfig;
import com.qcloud.cos.auth.BasicCOSCredentials;
import com.qcloud.cos.auth.COSCredentials;
import com.qcloud.cos.model.ObjectMetadata;
import com.qcloud.cos.model.PutObjectRequest;
import com.qcloud.cos.region.Region;

// 初始化COS客户端
COSCredentials cred = new BasicCOSCredentials("COS_SECRET_ID", "COS_SECRET_KEY");
ClientConfig clientConfig = new ClientConfig();
clientConfig.setRegion(new Region("COS_REGION"));
COSClient cosClient = new COSClient(cred, clientConfig);

// 上传文件到COS
ObjectMetadata objectMetadata = new ObjectMetadata();
objectMetadata.setContentLength(file.getSize());
PutObjectRequest putObjectRequest = new PutObjectRequest("bucketName", "path/to/file", file.getInputStream(), objectMetadata);
cosClient.putObject(putObjectRequest);

// 关闭COS客户端
cosClient.shutdown();