如何以字节形式发送图像,并在同一HTTP请求中一起发送json数据?

如果需要最大限度地减少带宽使用,只需发送如下数据:

DataOutputStream dOut = new DataOutputStream(socket.getOutputStream());
dOut.writeInt(imageBytes.length); 
dOut.write(imageBytes);
dOut.writeInt(jsonBytes.length); 
dOut.write(jsonBytes);

接收代码:

DataInputStream dIn = new DataInputStream(socket.getInputStream());
int imageBytesLength = dIn.readInt();  
byte[] imageBytes= new byte[imageBytesLength];
dIn.readFully(imageBytes, 0, imageBytesLength); 
int jsonBytesLength = dIn.readInt();  
byte[] jsonBytes= new byte[jsonBytesLength ];
dIn.readFully(jsonBytesLength , 0, jsonBytesLength ); 

您可以在 JSON 以适应 Byte[] 您的 Image .

JSON 可能是这样的:

{
    ...,

    "Image": [83, 97, 105, 102, 32, 115, 97, 121, 115, 32, 104, 101, 108, 108, 111],//Byte array of your image

    ...
}