腾讯云COS对象储存实现文件上传进度表显示

Java连接腾讯云COS对象储存实现文件上传接口详细配置 和 Java连接本地redis往期的文章，这篇文章建立在这一篇上。

文件上传的时候将对应进度，将进度保存在redis中，进度监听如果进度变更，则更新redis中的值，前端调用接口访问redis中的进度值，如果为100则断开请求。这里我查了几篇文章但是都不是很全，故而我

    @Autowired
    private PutObjectProgressListener putObjectProgressListener;

    
    @Override
    public  ResponseDto uploadOSSToll(MultipartFile file) {
        ResponseDto responseDto = null;
        String originalfileName = file.getOriginalFilename();
        //设置文件key
        String filePath = getFileKey(originalfileName);
        
        File f = null;
        try {
            f = File.createTempFile("tmp", null);
            file.transferTo(f);
            f.deleteOnExit();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 将对应的值设置到PutObjectProgressListener，
        putObjectProgressListener.setKeyRedos(originalfileName,f.length());
        // 上传 --> 带进度条上传
        cosClient.putObject(new PutObjectRequest(bucketName, originalfileName, f)
                .withGeneralProgressListener(putObjectProgressListener));
        // 关闭client
        cosClient.shutdown();
        String url = path + "/" + filePath;
        Map map = new HashMap<>();
        map.put("fileName", originalfileName);
        map.put("url", url);
        return new ResponseDto(10000, "成功并返回数据", map);
    }

putObjectProgressListener 便是进度监控，setKeyRedos方法将对应的值进行初始化

@Component
public class PutObjectProgressListener implements ProgressListener {

    private long bytesWritten = 0;
    private long totalBytes = -1;
    private String key = "";
    private int percent = 0;
    private boolean succeed = false;
    
    @Autowired
   private StringRedisTemplate redisTemplate;


    public void setKeyRedos(String key, Long size) {
        this.totalBytes = size;
        this.key = key;
        redisTemplate.opsForValue().set(key, String.valueOf(percent));
    }

    @Override
    public void progressChanged(ProgressEvent progressEvent) {
        long bytes = progressEvent.getBytes();
        ProgressEventType eventType = progressEvent.getEventType();
        switch (eventType) {
            case TRANSFER_STARTED_EVENT:
                break;
            case REQUEST_CONTENT_LENGTH_EVENT:
                this.totalBytes = bytes;
                break;
            case REQUEST_BYTE_TRANSFER_EVENT:
                this.bytesWritten += bytes;
                if (this.totalBytes != -1) {
                    int percent = (int) (this.bytesWritten * 100.0 / this.totalBytes);
                    //将进度percent放入redis中
                    redisTemplate.opsForValue().set(key, String.valueOf(percent));
                }
                break;
            case TRANSFER_COMPLETED_EVENT:
                this.succeed = true;
                break;
            case TRANSFER_FAILED_EVENT:
                break;
            default:
                break;
        }
    }
}

这里便实现了进度监视。这里设置了文件限制的大小，一般小文件不需要去显示进度表。

#multipart文件限制大小
spring.servlet.multipart.max-file-size=500MB
spring.servlet.multipart.max-request-size=500MB

redis中显示为53

当上传成功之后，redis中的值便是100了。