daofactory.java

航空定票系统：户端功能模块：用户登录模块

package com.tarena.abs.dao;
import java.util.*;
import java.io.*;
public class DAOFactory {
	Properties p;
	public static final String TYPE_FILE = "file";
	public static final String TYPE_DB = "database";
	private String type;
	private static DAOFactory factory;
    static{  factory = new DAOFactory();}
    private DAOFactory(){}
    public static DAOFactory newInstance() { return factory; }
    public void setType(String type) { this.type = type; }
    public void setProperties(Properties p) { this.p = p; }
    public DAOInterface createDAO ()throws FileNotFoundException {
    if(type.equals(TYPE_FILE))
    return new DAOFromFile(p);
    else
    return new DAOFromDB(p);
    }
}