腾讯cos/阿里oss获取上传进度条

墨蓝 2023-06-21 07:24 20阅读 0赞

**cos和oss代码都是一样的**,所以只说重点:  
新增一个类PutObjectProgressListener implements ProgressListener,  
用session去存放进度,非常多的弊端,可以考虑使用redis

public PutObjectProgressListener(/*HttpSession mSession,*/String keyForPercent, long sum) { 
    		//this.session = mSession;
    		//构造方法,把totalbytes设置为文件的总大小,不然进不到这个判断:if (this.totalBytes != -1) {,就无法设置进度信息(我没有看到其他地方设置totalbytes)
    		this.totalBytes = sum;
    		//一个唯一值
    		this.key = keyForPercent;
    		//session.setAttribute("upload_percent", percent);
    		redisTemplate.opsForValue().set(key, percent);
    }

if (this.totalBytes != -1) { 
    	//int percent = (int)(this.bytesWritten * 100.0 / this.totalBytes);
    	String percent = String.valueOf(this.bytesWritten * 100.0 / this.totalBytes);
        redisTemplate.opsForValue().set( key, percent);
       //logger.info("{} bytes have been written at this time, upload progress: %({}/{})", bytes, percent, this.bytesWritten, this.totalBytes);
    }

外面的controller去获取进度的时候,带上生成的那个key去redis中获取percent就可以了.

springCloud网关在转发请求到服务,sessionId会变更,前端直接在session去进度,可能取不到,如果真的要使用session,可以先确保用springSession代替session,用redis管理session,这样确保session经过转发之后仍然不变.  
加依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>  
            <groupId>org.springframework.session</groupId>  
            <artifactId>spring-session-data-redis</artifactId>  
    </dependency>

在网关和微服务启动类上加注解

@EnableRedisHttpSession

(未验证)