usermanager.java

功能还没做全的选课系统

package com.xuanke.student.control;

import java.util.List;

import com.xuanke.student.model.CourseDAO;
import com.xuanke.student.model.UserBean;
import com.xuanke.student.model.UserDAO;
import com.xuanke.utils.DBConnectionManager;
import com.xuanke.utils.MyJDBCException;

public class UserManager {
	private static UserManager instance=null;
	private UserDAO dao=null;
	/*
	 * 下列代码的基本意图是，保证StudentManager类仅有一个实例对象
	 * 有利于进行内存控制
	 * 还有利于继承StudentManager类，并在getInstance方法中返回其子类
	 * 如有如下类：
	 * public class NewStudentManager extends StudentManager{
	 *     ......
	 * }
	 * 如果希望StudentManager的getInstance方法返回NewStudentManager的实例
	 * 则只需要把getInstance方法修改为
	 * public static StudentManager getInstance(){
		if(instance==null)
			instance=new NewStudentManager();
		return instance;
	}
	 */
	private UserManager(){	
		
	}
	public static UserManager getInstance(){
		if(instance==null)
			instance=new UserManager();
		return instance;
	}
	public int findUser(String username,String password ) throws MyJDBCException {
		// TODO 自动生成方法存根
		
		//return 1;
		try {
			dao=new UserDAO(DBConnectionManager.getConnection());
			UserBean bean=null;
			try {
				bean = this.dao.findUser(username,password);
			} catch (MyJDBCException e) {
				// TODO 自动生成 catch 块
				e.printStackTrace();
			}
			
			if(bean!=null)
				return 1;
			else
				return -1;
		} 
		catch (MyJDBCException e) {
			throw new MyJDBCException(e.getMessage());
		}
		
		
	}

}