04-android - Android Overview Dongsu Han 1 Outline Java...

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Android Overview Dongsu Han 1
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Outline Java network programming overview Android Overview Android Emulator Overview Project Overview Getting Started 2
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Java Network Programming Java.net.* programming model Blocking model, you wait until work is done, maybe forever One thread required per connection Socket exposes input and output stream Java.nio.* programming model Introduced in Java 1.4, non-blocking IO New Interface: SocketChannel (in java.nio.channels) Reading/writing via Buffer objects rather than input/output streams Select() implemented 3
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Java.net.* Socket API Part of the java.net package import java.net.*; Provides two classes of sockets for TCP Socket : client side of socket ServerSocket : server side of socket Provides one socket type for UDP DatagramSocket 4
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Java.net.Socket Making a connection Socket s = new Socket(“hostname”, port); The constructor not only creates a socket, but makes a TCP connection. Socket exposes input and output stream. s.getOutputStream() s.getInputStream() Most of the time you'll chain the input/output stream to some other input/output stream or reader object to more easily handle the data. 5
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Java.net.Socket Create a print stream for writing OutputStream rawOut = socket.getOutputStream(); PrintStream pout = new PrintStream(rawOut); Create a data output stream for writing BufferedOutputStream buffOut = new BufferedOutputStream(rawOut); out =new DataOutputStream(buffOut); Create a data input stream for reading DataInputStream din = new DataInputStream(socket.getInputStream()); 6
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Java.net.ServerSocket
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