usertest.java

java 完全探索的随书源码

import java.io.*;

public class UserTest
{
  // Constant for the user data file name
  public static final String USER_DATA_FILE = "users.dat";

  public static void main(String[] args)
  {
    // Create a couple of User objects
    User user1 = new User( "User1", "foobar" );
    User user2 = new User( "admin", "admin" );
    User user3 = new User( "guest", "guest" );

    try
    {
      // Create the streams to write the objects out
      // Notice there is really no difference here. The real
      // difference is in the User class
      FileOutputStream out = new FileOutputStream( USER_DATA_FILE );
      ObjectOutputStream objOutStr = new ObjectOutputStream( out );
      objOutStr.writeObject( user1 );
      objOutStr.writeObject( user2 );
      objOutStr.writeObject( user3 );
      // Read the users back in
      FileInputStream in = new FileInputStream( USER_DATA_FILE );
      ObjectInputStream objInStr = new ObjectInputStream( in );
      // Print all of the User's out
      while( true )
      {
        System.out.println( objInStr.readObject() );
      }
    }
    catch( EOFException ex )
    {
      System.out.println( "All records have been read" );
    }
    catch( FileNotFoundException ex )
    {
      System.out.println( "Could not find the file " + USER_DATA_FILE );
    }
    catch( IOException ex )
    {
      System.out.println( "There was a problem with serialization of the users" );
    }
    catch( ClassNotFoundException ex )
    {
      System.out.println( "Could not find the User class definition" );
    }
  }
}