Android Network programming

Android's network programming is divided into 2 types: socket-based, and HTTP protocol-based.

Socket-based usage

Server-side:

First start a server-side socket serversocket SVR = new ServerSocket (8989);

Start listening for the request 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 a stream, that is, the transmitted byte stream, so any file can be transmitted on it. Whoever opens it, remember to close it.

Packaging with Datainputstream/dataoutputstream is because we want them to read and write to basic data types 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 they can communicate with each other. Whoever opens it, remember to close it.

Based on HTTP protocol

Typically, a request is sent to an application server. You need to use the httpurlconnection now.

First get httpurlconnection urlconn = new URL ("http://www.google.com"). OpenConnection ();

Set flag

Urlconn.setdooutput (TRUE); Urlconn.setdoinput (true);//post need to set Dooutput to True

Urlconn.setrequestmethod ("POST");

Urlconn.setusecache (false);//Set whether to use cache

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

Get the output stream, which makes it easy to send information to the server.

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

Read the request parameters in the flow

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 ();

After reading, remember to close connection urlconn.disconnect ();

The process record ends there.

Hara http://www.cnblogs.com/chenmouren/archive/2011/07/22/2114505.html