android - send and receive string and file over socket with streams -


i have app communicates on local network through socket other devices. in want transfer file , text. problem not know how both file , text , manage them in receive !

this text reciever : 

 try {             outputstream = new dataoutputstream(socket.getoutputstream());             outputstream_external = outputstream;             inputstream = new bufferedreader(new inputstreamreader(socket.getinputstream()));             log("success set streams");         }         catch (ioexception e1) {             log("error: connection not stable, exit");             shutdown();         }         while (true) {             string message = null;             try {                 message = inputstream.readline();                 if (message == null) {                     return;                 }                 g.log(message);                 jsonobject object = new jsonobject(message);                 string command = object.getstring(command.command);                 g.log(message);

this text sender:

public void sendcommand(string command) {         g.log("send command + " + command);         command = command.replace("\n", " ") + "\n";         if (outputstream == null) {             return;         }         final string commend = command;         thread thread = new thread(new runnable() {              @override             public void run() {                 // todo auto-generated method stub                 try {                     outputstream.write(commend.getbytes());                 }                 catch (ioexception e) {                     e.printstacktrace();                     g.log("sendcommand catch");                 }             }         });         thread.start();      }

how can receive text , file ?

that's why there many application level network protocols, http, ftp, smtp.

in case, need 2 types of messages, 1 string, file. each message should comply predefined format. example,

[4 bytes message type] + [4 bytes message length] + [message content]

you construct message on sender side, , parse message on receiver side.

however, in cases, don't have reinvent wheel. search on internet find if there existing protocol suitable you.


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