Android Network Programming tutorial, based on socket and HTTP protocol instance

Based on the use of sockets

Server side:

Start a server-side socket first

ServerSocket svr = new ServerSocket (8989);

Start listening for requests

Socket s = svr.accept ();

Get input and output

DataInputStream dis = new DataInputStream (S.getinputstream ());

DataOutputStream dos = new DataOutputStream (S.getoutputstream ());

The interaction of the socket is done through the stream, which means that the byte stream is transmitted, so any file can be transmitted above. Whoever opens it, remember to close it.

The Datainputstream/dataoutputstream are packaged because we want them to read and write the basic data type Readint (), Writeint (), readUTF (), writeUTF (), and so on.

Client:

Initiate a socket connection

Socket s = new socket ("192.168.1.200", 8989);

Get input and output

DataInputStream dis = new DataInputStream (S.getinputstream ());

DataOutputStream dos = new DataOutputStream (S.getoutputstream ());

Then we can communicate with each other. Whoever opens it, remember to close it.

based on HTTP protocol

Typically, you send a request to an application server. The httpurlconnection is needed at this time.

Get HttpURLConnection First

Urlconn = new URL ("http://www.google.com"). OpenConnection ();

Set flag

Urlconn.setdooutput (TRUE); Urlconn.setdoinput (TRUE);

You need to set Dooutput to true in case of post

Urlconn.setrequestmethod ("POST");

Urlconn.setusecache (false);//setting whether to use caching

Set Content-type

Urlconn.setrequestproperty ("Content-type", "application/x-www-form-urlencoded");

Get the output stream to make it easier to send information to the server.

DataOutputStream dos = new DataOutputStream (Urlconn.getoutputstream ());

Look in the stream inside write request parameters

Dos.writebytes ("Name=" +urlencoder.encode ("Chenmouren", "gb2312");

Dos.flush ();d os.close ()//close immediately after sending.

Get input stream, fetch data

Bufferreader reader = new BufferedReader (New InputStreamReader (Urlconn.getinputstream ()));

Reader.readline ()//use!=null to determine whether the end

Reader.close ();

Finish reading remember to close connection urlconn.disconnect ();