node.js - 上传媒体文件后无法在 Angular 2中播放该文件，显示404未找到

Question

我在 Angular2 中遇到问题:我有媒体上传模块(图像/视频)。因此，上传模块工作正常，但上传文件后，当我尝试观看视频或查看图像文件时，出现 404 Not Found 错误。但是如果我运行 ng build 并再次刷新它，我可以观看视频或查看图像文件。我做错了什么或者我们可以用某种方式处理这个问题吗？

获取http://localhost:4200/dist/assets/mediauploads/Desktop%20(19).jpg 404(未找到)

//This is my node js code

socket.on('Upload', function (data){
    var Name = data['Name'];
    Files[Name]['Downloaded'] += data['Data'].length;
    Files[Name]['Data'] += data['Data'];
    if(Files[Name]['Downloaded'] == Files[Name]['FileSize']) //If File is Fully Uploaded
    {
        fs.write(Files[Name]['Handler'], Files[Name]['Data'], null, 'Binary', function(err, Writen){
           var inp = fs.createReadStream("./src/assets/temp/" + Name);
           var out = fs.createWriteStream("./src/assets/mediauploads/" + Name);

          inp.pipe(out);
                  inp.on("end", function() {
                      var path="./src/assets/temp/" + Name;
                      var tempFile = fs.openSync(path, 'r');
                      if(fs.existsSync(path)){
                      fs.closeSync(tempFile);
                       fs.unlinkSync(path);
                       socket.emit('Done', {'Image' : './src/assets/mediauploads/' + Name});
                      }

                  });
        });
    }
    else if(Files[Name]['Data'].length > 10485760){ //If the Data Buffer reaches 10MB
        fs.write(Files[Name]['Handler'], Files[Name]['Data'], null, 'Binary', function(err, Writen){
            Files[Name]['Data'] = ""; //Reset The Buffer
            var Place = Files[Name]['Downloaded'] / 524288;
            var Percent = (Files[Name]['Downloaded'] / Files[Name]['FileSize']) * 100;
            socket.emit('MoreData', { 'Place' : Place, 'Percent' :  Percent});
        });
    }
    else
    {
        var Place = Files[Name]['Downloaded'] / 524288;
        var Percent = (Files[Name]['Downloaded'] / Files[Name]['FileSize']) * 100;
        socket.emit('MoreData', { 'Place' : Place, 'Percent' :  Percent});
    }
});

Answer 1

当您运行ng build时， Angular 应用程序将内置到dist文件夹中。我的猜测是，您的应用程序设置方式实际上是将图像上传到您的 src/assets 文件夹中。当您从 dist 文件夹运行应用程序时，您新上传的图像/视频不可见。当您重建应用程序时，文件将被复制到 dist 文件夹并可供访问。