JAVA advanced-Network Programming

JAVA advanced-Network Programming
> Connect to the server through a socket
Socket refers to Socket


> Read the homepage of any website
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/** * @author Lean  @date:2014-10-9   */public class SocketSample {public static void main(String[] args) {BufferedWriter writer=null;Socket socket=null;try {while (true) {try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}socket=new Socket("localhost",8080);OutputStream outputStream=socket.getOutputStream();outputStream.write("GET / HTTP/1.0\n\n".getBytes());BufferedReader reader=new BufferedReader(new InputStreamReader(socket.getInputStream()));writer=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("C:/Users/Administrator/Desktop/TheadSample.html")));String appendStr=null;while ((appendStr=reader.readLine()) != null) {//System.out.println(appendStr);writer.write(appendStr);}writer.close();reader.close();}} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{if (socket!=null) {try {socket.close();} catch (IOException e) {e.printStackTrace();}}}}}

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> Download any Webpage Through url
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/** * @author Lean  @date:2014-10-9   */public class URLSample {public static void main(String[] args) {try {URL url=new URL("HTTP","www.baidu.com",80,"");//URL url=new URL("http://www.baidu.com");HttpURLConnection connection=(HttpURLConnection) url.openConnection();connection.connect();InputStream is=connection.getInputStream();byte[] buff=new byte[1024];int length=0;while ((length=is.read(buff))!=-1) {System.out.println(new String(buff));}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}

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> Checks the cookie information sent from the website.
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/** * @author Lean  @date:2014-10-9   */public class HttpCookieSample {/** * @param args */public static void main(String[] args) {CookieManager manager=new CookieManager();manager.setCookiePolicy(new CustomerPolicy());CookieHandler.setDefault(manager);try {URL url=new URL("http://www.baidu.com");URLConnection conn=url.openConnection();Object content=conn.getContent();List
 
   cookies=manager.getCookieStore().getCookies();for (HttpCookie httpCookie : cookies) {System.out.println(httpCookie.getName()+"  "+httpCookie.getValue()+"    "+httpCookie.getDomain());printCookieLiveAge(httpCookie);System.out.println("Cookie secured:"+httpCookie.getSecure());System.out.println("...........");}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}private static void printCookieLiveAge(HttpCookie httpCookie) {long age=httpCookie.getMaxAge();SimpleDateFormat df=new SimpleDateFormat("HH:mm:ss");System.out.println(age!=-1?"Cookie will expire when close ":"Cookie age is:"+df.format(age));}static class CustomerPolicy implements CookiePolicy{@Overridepublic boolean shouldAccept(URI uri, HttpCookie cookie) {return true;}}}
 

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> Compile a server program that serves multiple clients at the same time
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/** * @author Lean  @date:2014-10-9   */public class ServerSocketSample {private static ServerSocket server=null;public static void main(String[] args) {try {server=new ServerSocket(8080);ExecutorService pool=Executors.newFixedThreadPool(3);while (true) {Socket socketObject= server.accept();pool.submit(new CustomRunnable(socketObject));}} catch (IOException e) {e.printStackTrace();}}static class CustomRunnable implements Runnable{byte[] buff=new byte[512];private Socket socketObject;public CustomRunnable(Socket socketObject) {this.socketObject=socketObject;}@Overridepublic void run() {try {System.out.println("Thread ID>>"+Thread.currentThread().getId());InputStream stream=socketObject.getInputStream();stream.read(buff);OutputStream os=socketObject.getOutputStream();os.write(buff);socketObject.close();} catch (IOException e) {e.printStackTrace();}}}}

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> Compile the actual file storage server program
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StorgeServerSample

/*** @ Author Lean @ date: 2014-10-10 */public class StorgeServerSample {public static void main (String [] args) {ServerSocket socket = null; ExecutorService service = Executors. newFixedThreadPool (Runtime. getRuntime (). availableProcessors (); try {socket = new ServerSocket (8080); try {while (true) {Socket socketObject = socket. accept (); service. submit (new RequestRunnable (socketObject) ;}} finally {socket. close ();}} Catch (IOException e) {e. printStackTrace () ;}} static class RequestRunnable implements Runnable {private Socket requestSocket; public RequestRunnable (Socket socketObject) {requestSocket = socketObject;} @ Overridepublic void run () {try {DataInputStream dataIs = new DataInputStream (requestSocket. getInputStream (); DataOutputStream dataOs = new DataOutputStream (requestSocket. getOutputStream (); int cmd = dataIs. re AdInt (); String message = cmd = 0? "Put": "Get"; String fileName = dataIs. readUTF (); message + = fileName + "REQUEST"; fileName = "C:/Documents and Settings/Administrator/desktop/Server.txt"; if (cmd = 0) {uploadFile (dataIs, fileName);} else {downFile (dataOs, fileName) ;}} catch (IOException e) {e. printStackTrace () ;}} private void uploadFile (DataInputStream dataIs, String fileName) {try {BufferedWriter writer = new BufferedWriter (new FileWriter (fileName )); String tempStr; while (! (TempStr = dataIs. readUTF ()). equals ("-1") {writer. write (tempStr); writer. newLine ();} writer. close (); dataIs. close ();} catch (IOException e) {e. printStackTrace () ;}} private void downFile (DataOutputStream dataOs, String fileName) {try {BufferedReader reader = new BufferedReader (new FileReader (fileName); String tempStr = null; while (tempStr = reader. readLine ())! = Null) {dataOs. writeUTF (tempStr);} dataOs. writeUTF ("-1"); dataOs. close (); reader. close ();} catch (FileNotFoundException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();}}}}

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StorgeClientSample

Public class StorgeClientSample {public static void main (String [] args) {int cmd = 1; try {Socket requestScoket = new Socket (); requestScoket. connect (new InetSocketAddress ("localhost", 8080); if (cmd = 0) {String fileName = "C:/Documents and Settings/Administrator/desktop/Test.txt "; bufferedReader reader = new BufferedReader (new FileReader (fileName); DataOutputStream dataOs = new DataOutputStream (requestScoket. getOutp UtStream (); dataOs. writeInt (cmd); dataOs. writeUTF (fileName); String tempStr; while (tempStr = reader. readLine ())! = Null) {System. out. println (tempStr); dataOs. writeUTF (tempStr);} dataOs. writeUTF ("-1"); dataOs. close (); reader. close ();} else {String fileName = "C:/Documents and Settings/Administrator/desktop/Down.txt"; BufferedWriter writer = new BufferedWriter (new FileWriter (fileName )); dataOutputStream dataOs = new DataOutputStream (requestScoket. getOutputStream (); dataOs. writeInt (cmd); dataOs. writeUTF (fileName); DataInputStream da TaIs = new DataInputStream (requestScoket. getInputStream (); String tempStr; while (! (TempStr = dataIs. readUTF ()). equalsIgnoreCase ("-1") {System. out. println (tempStr); writer. write (tempStr); writer. newLine ();} dataIs. close (); writer. close () ;}} catch (IOException e) {e. printStackTrace ();}}}

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> Create multiple radio wave servers and clients

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StockTradesServer

/** * @author Lean  @date:2014-10-11   */public class StockTradesServer {public static void main(String[] args) {Thread stockSThread=new Thread(new StockTradeGenerator());stockSThread.setDaemon(true);stockSThread.start();try {Thread.sleep(30000);} catch (InterruptedException e) {}}static class StockTradeGenerator implements Runnable{private DatagramSocket broadcastSocket;private String[] stockSymbols ={"IBM","SNE","XRX","MHP","NOK"};public StockTradeGenerator() {try {broadcastSocket=new DatagramSocket(4445);} catch (SocketException e) {System.out.println("error create socket ! ");}}@Overridepublic void run() {byte[] buff=new byte[126];try {while (true) {int index=(int) (Math.random()*5);float trade=generatorRandomTrade(index);String tempStr=String.format("%s %.2f@ %s",stockSymbols[index],trade,now());buff=tempStr.getBytes();InetAddress groupInetAddresses;groupInetAddresses = InetAddress.getLocalHost();DatagramPacket datagramPacket=new DatagramPacket(buff,buff.length, groupInetAddresses,4446);broadcastSocket.send(datagramPacket);Thread.sleep(500);}} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}finally{broadcastSocket.close();}}}public static float generatorRandomTrade(int index) {float trade=(float) Math.random();switch (index) {case 0:trade+=118;break;case 1:trade+=29;break;case 2:trade+=8;break;case 3:trade+=26;break;case 4:trade+=14;break;default:break;} return trade;}public static Object now() {SimpleDateFormat df=new SimpleDateFormat("HH:mm:ss");Date date=new Date();return df.format(date);}}

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StockTradeClient

/** * @author Lean  @date:2014-10-11   */public class StockTradeClient {public static void main(String[] args) throws IOException {MulticastSocket multicastSocket=new MulticastSocket(4446);InetAddress address=InetAddress.getByName("232.0.1.1");multicastSocket.joinGroup(address);for (int i = 0; i < 10; i++) {byte[] buff=new byte[256];DatagramPacket datagramPacket=new DatagramPacket(buff,buff.length);multicastSocket.receive(datagramPacket);System.out.println(new String(datagramPacket.getData(),0,datagramPacket.getLength()));}multicastSocket.leaveGroup(address);multicastSocket.close();}}

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