发送图片socket io和android

Question

我是socket.io的初学者。我已经用过图书馆了

https://www.npmjs.com/package/socket.io-stream

我们成功地使用浏览器上传了图像。但现在，我想从android应用程序上传图片。如果谁有android代码，请给我..

https://github.com/socketio/socket.io-client-java/issues/29

我一直在谷歌上搜索，但没有找到任何适当的解决方案。

Answer 1

   var imageBuffer = customJs.decodeBase64Image(base64Data);
   var imageTypeDetected = imageBuffer.type.match(/\/(.*?)$/);
   var filename = 'profile-' + Date.now() + '.' + imageTypeDetected[1];
   // config.uploadImage --- Folder path where you want to save.
   var uploadedImagePath = config.uploadImage + filename;
   try {
       fs.writeFile(uploadedImagePath, imageBuffer.data, function () {
       dbMongo.updateImage({email: decoded.email, user_id: decoded.userId, 'profile_picture': config.showImagePath + filename}, function (res) {
       if (res.error) { 
       socket.emit('set_update_image', {'error': 1, 'message': 'Error!' + res.message, 'data': null, 'status': 400});
       } else {
         console.log(res);
         socket.emit('set_update_image', res);
       }
       });
     });
      } catch (e) {
           socket.emit('set_update_image', {'error': 1, 'message': 'Internal server error ' + e, 'data': null, 'status': 400});
      }

从其他文件调用函数

exports.decodeBase64Image = function decodeBase64Image(dataString) {
var matches = dataString.match(/^data:([A-Za-z-+\/]+);base64,(.+)$/);
var response = {};

if (matches.length !== 3)
{
    return new Error('Invalid input string');
}

response.type = matches[1];
response.data = new Buffer(matches[2], 'base64');

return response;
}

Answer 2

使用socket从android上传图片，需要以base64字符串的形式发送图片。

下面是将图像转换为base64的示例，然后发送与另一个参数相同的数据。

String base64Image = getBase64Data(dirPath + "/" + fileName);

public String getBase64Data(String filePath) {
        try {
            InputStream inputStream = new FileInputStream(filePath);//You can get an inputStream using any IO API
            byte[] bytes;
            byte[] buffer = new byte[8192];
            int bytesRead;
            ByteArrayOutputStream output = new ByteArrayOutputStream();
            try {
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    output.write(buffer, 0, bytesRead);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            bytes = output.toByteArray();
            return "data:image/jpeg;base64," + Base64.encodeToString(bytes, Base64.DEFAULT);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

Answer 3

在安卓系统中，您需要使用Base64对图像进行编码

 public void sendImage(String path)
 {
    JSONObject sendData = new JSONObject();
    try{
          sendData.put("imageData", encodeImage(path));
          socket.emit("image",sendData);
       }catch(JSONException e){

       }
 }

 private String encodeImage(String path)
 {
      File imagefile = new File(path);
      FileInputStream fis = null;
      try{
          fis = new FileInputStream(imagefile);
      }catch(FileNotFoundException e){
          e.printStackTrace();
      }
      Bitmap bm = BitmapFactory.decodeStream(fis);
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      bm.compress(Bitmap.CompressFormat.JPEG,100,baos);
      byte[] b = baos.toByteArray();
      String encImage = Base64.encodeToString(b, Base64.DEFAULT);
      //Base64.de
      return encImage;
}

在服务器端，接收图像并进行解码

socket.on("image", function(info) {
    var img = new Image();
    img.src = 'data:image/jpeg;base64,' + info.imageData;

});