businesslogic.java

Java实现的图书管理系统

/*
 * BusinessLogic.java
 *
 * Created on 2003年5月9日, 下午9:07
 */

/**
 *
 * @author  administrator
 */
import java.util.*;
import java.math.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;


class BusinessLogic {
    
    private BookSessionHome bookSessionHome;
    private BookSession bookSession;
    
    /** Creates a new instance of BusinessLogic */
    public BusinessLogic() 
    {
        try {
           Context initial = new InitialContext();
           Object objref = initial.lookup("java:comp/env/ejb/SimpleBookSession");

           bookSessionHome = 
               (BookSessionHome)PortableRemoteObject.narrow(objref, 
                                            BookSessionHome.class);
           
           bookSession = bookSessionHome.create();
           
        }catch (Exception ex) {
           System.err.println("Caught an exception." );
           ex.printStackTrace();
        }
        
        
        
    }
    
    public Vector getAllBook(String str)
    {
        Vector v=new Vector();
        try {
                     
           v=(Vector)bookSession.getAllBook(str);
           
        }catch (Exception ex) {
           System.err.println("Caught an exception." );
           ex.printStackTrace();
       }
        
        return v;
    }
    
    public Vector getQueryBook(String bookName)
    {
        Vector v=new Vector();
        try {
                     
           v=bookSession.getQueryBook(bookName);
           
        }catch (Exception ex) {
           System.err.println("Caught an exception." );
           ex.printStackTrace();
       }
        
        return v;
        
    }
    
    public Vector getBorrowedBook(String str)
    {
        Vector v=new Vector();
        try {
                     
           v=bookSession.getBorrowedBook(str);
           
        }catch (Exception ex) {
           System.err.println("Caught an exception." );
           ex.printStackTrace();
       }
        
        return v;
    }
    
    public Vector getQueryBorrowedBook(String str)
    {
        Vector v=new Vector();
        try {
                     
           v=bookSession.getQueryBorrowedBook(str);
           
        }catch (Exception ex) {
           System.err.println("Caught an exception." );
           ex.printStackTrace();
       }
        
        return v;
    }
    
    public int borrowBook(String bookId)
    {
        int result=0;
        try {
                     
           result=bookSession.borrowBook(bookId);
           
        }catch (Exception ex) {
           System.err.println("Caught an exception." );
           ex.printStackTrace();
       }
       
        return result;
    }
    
    public int returnBook(String borrowId)
    {
        int result=0;
        try {
                     
           result=bookSession.returnBook(borrowId);
           
        }catch (Exception ex) {
           System.err.println("Caught an exception." );
           ex.printStackTrace();
       }
       
        return result;
        
    }
    
    public int checkUser(String userName,String userPassword)
    {
        int result=0;
        try {
                     
           result=bookSession.checkUser(userName, userPassword);
           
        }catch (Exception ex) {
           System.err.println("Caught an exception." );
           ex.printStackTrace();
       }
       
        return result;
    }
    
}