logondao.java

java电子相册一般网页里面实现图片切换的这个电子相册的代码

/* ====================================================================
 * $Id$
 * ====================================================================
 *  文件名    LogonDao.java
 *  机能名    
 *  履历      2005-1-29 dlxu 创建新文件  
 *           Copyright 2004 东南大学 All Rights Reserved
 * ====================================================================
 */
package cn.edu.seu.album.dao;

import java.util.Iterator;

import net.sf.hibernate.Query;
import net.sf.hibernate.Session;

import org.apache.log4j.Category;
import org.apache.log4j.Logger;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import cn.edu.seu.album.common.PJException;
import cn.edu.seu.album.model.LogonCondition;
import cn.edu.seu.album.pojo.Person;

/**
 * <p> [概 要] </p>
 * <p> [详 细] </p>
 * <p> [备 考] 无。</p>
 *
 * @author dlxu
 * @version 1.0 2005-1-29
 * @since 1.0
 */
public final class LogonDao {

    /**
     * 日志定义。
     */
    private static final Category log = Logger.getInstance(LogonDao.class);

    /**
     * 单例模式。
     */
    private static LogonDao dao = new LogonDao();

    /**
     * <p> [概 要] 构造方法</p>
     * <p> [详 细] 构造方法</p>
     * <p> [备 考] 无。</p>
     *
     */
    private LogonDao() {

    }

    /**
     * <p> [概 要] </p>
     * <p> [详 细] </p>
     * <p> [备 考] 无。</p>
     * @return
     */
    public static LogonDao getInstance() {
        return dao;
    }

    /**
     * 检索语句1
     */
    private static final String SELECT_01 = ""
            + " from cn.edu.seu.album.pojo.Person person "
            + " where person.name = ?               "
            + " and person.password = ? ";

    /**
     * <p> [概 要] </p>
     * <p> [详 细] </p>
     * <p> [备 考] 无。</p>
     * @param session
     * @param errs
     * @param cond
     * @return
     */
    public Person getUserInfo(Session session, ActionMessages errs,
            LogonCondition cond) throws PJException {
        log.debug("getUserInfo开始");
        try {
            String userName = cond.getUserName();
            String password = cond.getPassword();

            Query query = session.createQuery(SELECT_01);

            query.setString(0, userName);
            query.setString(1, password);
            Iterator iter = query.iterate();

            if (iter.hasNext()) {
                Person person = (Person) iter.next();
                log.debug(person);
                log.debug("getUserInfo结束");
                return person;
            } else {
                ActionMessage err = new ActionMessage("login.fail");
                errs.add(ActionMessages.GLOBAL_MESSAGE, err);
                log.debug("getUserInfo非正常结束");
                return null;
            }

        } catch (Exception ex) {
            log.warn(ex);
            throw new PJException(ex);
        }
    }
}