『牛角书』Ark UI的图库中文件上传到服务器 原创

上传文件的API中支持将应用内部存储路径文件上传，该部分较为简单类似以下代码

request.upload({ url: 上传URL,
            files:[{
                       filename: this.videoname,
                       name:'file',
                       uri:'internal://cache/'+this.videoname,
                       type:'mp4',
                   }],
            data:[{name:"userid",value:this.userid}]
        },
            (err, data) => {
                if (err) {
                    prompt.showToast({
                        message: '上传失败'
                    })
                    console.error('Failed to request the upload. Cause: ' + JSON.stringify(err));
                    return;
                }
                that.uploadvideostatus = 1;
                prompt.showToast({
                    message: '上传成功'
                })
            });

主要要说一下如何将图库中文件获取到应用内部存储即internal://cache/ 下

mediaLibrary.getMediaLibrary().startMediaSelect(option).then((value) => {
            console.log("Media resources selected."+value);             // Obtain the media selection value.
            // 使用calculate同步方法，返回OperateData对象。
            this.utilInterface = createLocalParticleAbility('应用包名.util.UtilServiceAbility');
            this.utilInterface.CopyToCache(value[0],result => {
                console.info(this.lable+result)
                that.videoname = result;
                prompt.showToast({
                    message: '选择成功'
                })
                that.UploadVideo();
            })
        }).catch((err) => {
            console.log("An error occurred when selecting media resources.");
            prompt.showToast({
                message: '选择失败'
            })
        });

在上述代码中调用到PA中的CopyToCache方法

 public void CopyToCache(String path, Callback callback) throws IOException {
        HiLog.info(LABEL_LOG,"开始");
        DataAbilityHelper helper=DataAbilityHelper.creator(StaticV.context);
        HiLog.info(LABEL_LOG,"helper");
        String fileName = "EXCEPTION";
        //原始文件Uri
        Uri src = Uri.parse(path);
        HiLog.info(LABEL_LOG,"parse "+src);
        //通过DataAbilityHelper获取文件名与文件类型
        try {
            DataAbilityHelper pathHelper = DataAbilityHelper.creator(StaticV.context, src, false);
            ResultSet resultSet = pathHelper.query(src,null,null);
            HiLog.info(LABEL_LOG,"数量"+resultSet.getRowCount());
            resultSet.goToNextRow();
            String srcpath = resultSet.getString(resultSet.getColumnIndexForName(AVStorage.AVBaseColumns.DATA));
            HiLog.info(LABEL_LOG,"路径"+srcpath);
            String[] strings = srcpath.split("/");
            //文件名
            fileName = strings[strings.length-1];
            HiLog.info(LABEL_LOG,"文件名"+fileName);
            resultSet.close();
            pathHelper.release();
        } catch (DataAbilityRemoteException e) {
            e.printStackTrace();
        }

        if(!fileName.equals("EXCEPTION")){
            FileDescriptor srcfd = null;
            try {
                //图库中文件的文件描述符
                srcfd = helper.openFile(src,"r");
            } catch (DataAbilityRemoteException e) {
                HiLog.info(LABEL_LOG,"srcfd erro "+e);
                e.printStackTrace();
            }
            //获取原始文件输入流
            FileInputStream srcfis = new FileInputStream(srcfd);
            HiLog.info(LABEL_LOG,"fis");

            String tarpath = StaticV.context.getCacheDir().getAbsolutePath();
            HiLog.info(LABEL_LOG,tarpath);
            //获取应用内部目录的文件输出流
            FileOutputStream fos = new FileOutputStream(tarpath+"/"+fileName);
            int length;
            byte[] buffer = new byte[1024];
            while((length = srcfis.read(buffer))!=-1){
                fos.write(buffer,0,length);
            }
            HiLog.info(LABEL_LOG,"写入完成");
            srcfis.close();
            fos.close();
            helper.release();

            callback.reply(fileName);
            File tarfile = new File(tarpath+"/"+fileName);
            HiLog.info(LABEL_LOG, String.valueOf(tarfile.isFile()));
        }
    }

StaticV.context即应用上下文