读写文件

    @Override
    public boolean downObject(String key, OutputStream outputStream) {
        if(key == null || "".equals(key) || outputStream == null){
            return false;
        }
        boolean flag = false;
        boolean isExists = false;
        String bucketName = "";
        // 判断对象是否存在
        if(this.getOssClient().doesObjectExist(this.getConfig().getAliyunOssOtherBucketName(), key)){
            bucketName = this.getConfig().getAliyunOssOtherBucketName();
            isExists = true;
        }else if(this.getOssClient().doesObjectExist(this.getConfig().getAliyunOssImageBucketName(), key)){
            bucketName = this.getConfig().getAliyunOssImageBucketName();
            isExists = true;
        }
        if(isExists){
            OSSObject ossObject = this.getOssClient().getObject(bucketName, key);
            BufferedInputStream input = new BufferedInputStream(ossObject.getObjectContent());
            BufferedOutputStream output = new BufferedOutputStream(outputStream);
            byte[] buffer = new byte[1024*10];
            int length = 0;
            try {
                while((length=input.read(buffer)) != -1){
                    output.write(buffer, 0, length);
                }
                output.flush();
                flag = true;
            } catch (IOException e) {
                e.printStackTrace();
            }finally{
                try {
                    input.close();
                    output.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return flag;
    }