JAVA learning notes (60)-network programming logon instance, java learning notes

JAVA learning notes (60)-network programming logon instance, java learning notes
Client

Import java. io. bufferedReader; import java. io. IOException; import java. io. inputStream; import java. io. inputStreamReader; import java. io. objectOutputStream; import java. io. outputStream; import java. io. printWriter; import java.net. socket; import java.net. unknownHostException;/** client */public class LoginClient {public static void main (String [] args) {try {// 1. create a client Socket, specify the server address and port number, and establish a connection Socket socket = n Ew Socket ("localhost", 8888); // 2. obtain the output stream and send the OutputStream OS = socket to the server. getOutputStream (); // PrintWriter pw = new PrintWriter (OS); // encapsulate it as a print stream ObjectOutputStream oos = new ObjectOutputStream (OS); User user = new User ("admin ", "123"); oos. writeObject (user); // serialize the object socket. shutdownOutput (); // close the current output stream // 3. obtain the input stream and read the server response information. InputStream is = socket. getInputStream (); BufferedReader br = new BufferedReader (new InputStr EamReader (is); String reply = br. readLine (); while (reply! = Null) {System. out. println ("I Am a client, the server says:" + reply); reply = br. readLine ();} socket. shutdownInput (); // 4. disable resource br. close (); is. close (); oos. close (); OS. close (); socket. close ();} catch (UnknownHostException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();}}}

Title

Import java. io. bufferedReader; import java. io. IOException; import java. io. inputStream; import java. io. inputStreamReader; import java. io. objectInputStream; import java. io. objectOutputStream; import java. io. outputStream; import java. io. printWriter; import java.net. serverSocket; import java.net. socket;/** server */public class LoginServer {public static void main (String [] args) {try {ServerSocket serverSocket = new ServerSocket (8888); System. out. println ("****** the server is about to start, waiting for the Client Connection"); int count = 0; // count the number of clients // The loop listener waits for the client connection while (true) {Socket socket = serverSocket. accept (); // create a new thread ServerThread thread = new ServerThread (socket); thread. start (); // start the thread count ++; System. out. println ("number of clients:" + count); System. out. println ("Client IP:" + socket. getInetAddress (). getHostAddress () ;}} catch (IOException e) {e. printStackTrace ();}}}

Server-side thread processing

Import java. io. IOException; import java. io. inputStream; import java. io. objectInputStream; import java. io. outputStream; import java. io. printWriter; import java.net. socket;/** server-side Thread processing class */public class ServerThread extends Thread {// Socket socket related to this Thread = null; public ServerThread (Socket socket) {this. socket = socket;} // The operation executed by the thread @ Override public void run () {InputStream is = null; ObjectInputStream ois = Null; OutputStream OS = null; PrintWriter pw = null; try {is = socket. getInputStream (); // byte stream ois = new ObjectInputStream (is); User user = (User) ois. readObject (); System. out. println ("user name:" + user. getUsername (); System. out. println ("Password:" + user. getPassword (); socket. shutdownInput (); // close the current input stream OS = socket. getOutputStream (); pw = new PrintWriter (OS); pw. println ("Welcome! "); Pw. flush (); socket. shutdownOutput ();} catch (IOException e) {e. printStackTrace ();} catch (ClassNotFoundException e) {e. printStackTrace ();} finally {try {if (pw! = Null) pw. close (); if (OS! = Null) OS. close (); if (ois! = Null) ois. close (); if (is! = Null) is. close (); socket. close () ;}catch (IOException e) {e. printStackTrace ();}}}}

Title

Import java. io. serializable;/** entity class User */public class User implements Serializable {private static final long serialVersionUID = 6682618522883563864L; private int id; private String username; private String password; public User () {super ();} public User (String username, String password) {super (); this. username = username; this. password = password;} public int getId () {return id;} public void setId (int id) {this. id = id;} public String getUsername () {return username;} public void setUsername (String username) {this. username = username;} public String getPassword () {return password;} public void setPassword (String password) {this. password = password;} public static long getSerialversionuid () {return serialVersionUID ;}}