viewdelbo.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    ViewDelBo.java
 *  机能名    
 *  履历      2005-3-6 dlxu 创建新文件  
 *           Copyright 2004 东南大学 All Rights Reserved
 * ====================================================================
 */
package cn.edu.seu.album.bo;

import java.io.File;

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.PJBaseBo;
import cn.edu.seu.album.common.PJCondition;
import cn.edu.seu.album.common.PJException;
import cn.edu.seu.album.common.PJResult;
import cn.edu.seu.album.common.StringUtil;
import cn.edu.seu.album.dao.ViewDao;
import cn.edu.seu.album.model.ViewDelCondition;
import cn.edu.seu.album.pojo.Photo;

/**
 * <p> [概 要] </p>
 * <p> [详 细] </p>
 * <p> [备 考] 无。</p>
 *
 * @author dlxu
 * @version 1.0 2005-3-6
 * @since 1.0
 */
public class ViewDelBo extends PJBaseBo {
    /**
     * 日志定义。
     */
    private static final Category log = Logger.getInstance(ViewDelBo.class);

    /**
     * <p> [概 要] </p>
     * <p> [详 细] </p>
     * <p> [备 考] 无。</p>
     * @param condition
     * @param errs
     * @return
     * @throws PJException
     */
    public PJResult doBiz(PJCondition condition, ActionMessages errs)
            throws PJException {
        log.debug("doBiz开始");
        // TODO Auto-generated method stub
        ViewDelCondition cond = (ViewDelCondition) condition;
        try {
            boolean checkOk = checkCondition(cond, errs);
            if (checkOk) {
                Photo photo = ViewDao.getInstance().searchPhoto(
                        cond.getPictureId(), session);
                if (null == photo) {
                    log.debug("图片不存在");
                    return null;
                }
                checkOk = checkOwner(cond, photo, errs);
                if (checkOk) {
                    String path = cond.getPicAdd();
                    File file = new File(path + photo.getName());
                    if (file.exists()) {
                        file.delete();
                    } else {
                        log.debug("图片" + file.getAbsolutePath() + "在文件系统中不存在");
                    }
                    ViewDao.getInstance().deletePhoto(photo, session);
                }
            }
        } catch (Exception e) {
            log.debug(e.getStackTrace());
            throw new PJException(e);
        }

        log.debug("doBiz结束");
        return null;
    }

    /**
     * <p> [概 要] </p>
     * <p> [详 细] </p>
     * <p> [备 考] 无。</p>
     * @param cond
     * @param photo
     * @param errs
     * @return
     */
    private boolean checkOwner(ViewDelCondition cond, Photo photo,
            ActionMessages errs) {
        log.debug("checkOwner开始");

        boolean flag = true;

        String sessionPersonName = cond.getSb().getPerson().getName();
        String photoPersonName = photo.getPerson().getName();

        flag = photoPersonName.equals(sessionPersonName);

        if (!flag) {
            log.debug("用户不是图片拥有者");
            errs.add("view", new ActionMessage(
                    "view.delete.picture.not.belongto.owner"));
        }

        log.debug("checkOwner结束");
        return flag;
    }

    /**
     * <p> [概 要] </p>
     * <p> [详 细] </p>
     * <p> [备 考] 无。</p>
     * @param cond
     * @param errs
     * @return
     */
    private boolean checkCondition(ViewDelCondition cond, ActionMessages errs) {
        log.debug("checkCondition开始");
        boolean flag = true;

        String pictureId = cond.getPictureId();

        if (StringUtil.isEmpty(pictureId)) {
            log.debug("图片ID为空");
            errs.add("view", new ActionMessage("view.delete.pictureId.empty"));
            flag = false;
        }

        log.debug("Check结果:" + flag);
        log.debug("checkCondition结束");
        return flag;
    }

}