loginimpl.java

本书由浅入深、循序渐进地介绍了MVC的体系结构和如何构建一个基于MVC的Web框架

package com.myContent.service.impl;

import java.sql.SQLException;

import org.apache.log4j.Logger;

import com.gd.jdbc.impl.GdDbConnection;
import com.myContent.dao.UserDAO;
import com.myContent.dao.impl.UserDAOImpl;
import com.myContent.service.Login;
import com.myContent.vo.User;
public class LoginImpl implements Login{
	static Logger logger = Logger.getLogger(LoginImpl.class.getName());
	private UserDAO userDao = null;
	/**该方法用来实现向数据库查询用户
	*/
	public User queryUser(User user) throws Exception{
		User user1 = null;
		//取得连接
		GdDbConnection con = new GdDbConnection(this);
		try {			
			userDao = new UserDAOImpl(con.getConnection(this));
			//获取用户	
			user1 = userDao.queryUser(user.getUsername());
		} catch (SQLException e) {
			logger.error(e);
        }  catch(Exception e) {
			logger.error(e);
		} finally {
			//关闭连接
			con.close(this);
			return user1;
		}
  	}
	
	/**该方法用来验证用户的密码
	*/
	public boolean validateUser(User user) throws Exception{
		boolean flag = false;
		try {
			//假如密码一致
			if (this.queryUser(user) != null && user.getPassword().equals(this.queryUser(user).getPassword())) {
				flag = true;
			} 
		} catch(Exception e) {
			logger.error(e);
		} finally {
			return flag;
		}
  	}
}