в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

Admin: 1 версия

2010-05-31T15:30:52Z

1 версия

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== Console based login ==



<source lang="java">
import java.io.Console;
public class Login {
public static void main(String[] args) throws Exception {
Console console = System.console();
String username = console.readLine("Username:");
char[] pwd = console.readPassword("Password:");
System.out.println("Username = " + username);
System.out.println("Password = " + new String(pwd));
username = "";
for (int i = 0; i < pwd.length; i++)
pwd[i] = 0;
}
}</source>



== Console.ReadLine ==



<source lang="java">
import java.io.Console;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.MessageFormat;
import java.util.Date;
import java.util.Locale;
public class DateServer {
public final static int PORT = 5000;
private ServerSocket ss;
public DateServer(int port) {
try {
ss = new ServerSocket(port);
} catch (IOException ioe) {
System.err.println("Unable to create server socket: " + ioe);
System.exit(1);
}
}
private void runServer() {
Console console = System.console();
Handler h = new Handler(ss);
h.start();
while (true) {
String cmd = console.readLine(">");
if (cmd == null)
continue;
if (cmd.equals("exit"))
System.exit(0);
}
}
public static void main(String[] args) {
new DateServer(PORT).runServer();
}
}
class Handler extends Thread {
private ServerSocket ss;
Handler(ServerSocket ss) {
this.ss = ss;
}
public void run() {
while (true) {
try {
Socket s = ss.accept();
ObjectInputStream ois;
ois = new ObjectInputStream(s.getInputStream());
Locale l = (Locale) ois.readObject();
PrintWriter pw;
pw = new PrintWriter(s.getOutputStream());
MessageFormat mf;
mf = new MessageFormat("The date is {0, date, long}", l);
Object[] args = { new Date() };
pw.println(mf.format(args));
pw.close();
} catch (Exception e) {
System.err.println(e);
}
}
}
}</source>



== Masking a password with the Console class ==



<source lang="java">
import java.io.Console;
public class Main {
public static void main(String[] args) {
Console console = System.console();
char passwordArray[] = console.readPassword("Enter your secret password: ");
console.printf("Password entered was: %s%n", new String(passwordArray));
}
}</source>



== Printing text with the Console class ==



<source lang="java">
import java.io.Console;
public class Main {
public static void main(String[] args) {
Console console = System.console();
console.printf("%s%n", "this is a test");
}
}</source>



== Use Console class to read user input? ==



<source lang="java">
import java.io.Console;
import java.util.Arrays;
public class Main {
public static void main(String[] args) {
Console console = System.console();
String username = console.readLine("Username: ");
char[] password = console.readPassword("Password: ");
if (username.equals("admin") && String.valueOf(password).equals("secret")) {
console.printf("Welcome to Java Application %1$s.\n", username);
Arrays.fill(password, " ");
} else {
console.printf("Invalid username or password.\n");
}
}
}</source>

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в 17:44, 31 мая 2010

Admin: 1 версия