announcetag.java

一个不错的bbs论坛系统．对初学者很有帮助

package com.yhbbs.comm.tag;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.log4j.Logger;
import com.yhbbs.bbs.biz.AnnounceBiz;
import com.yhbbs.bbs.itface.AnnceLink;
import com.yhbbs.utils.Constants;
import com.yhbbs.utils.DateUtils;
import com.yhbbs.utils.ReqUtils;
/**
 * <p>Title: 发表论坛公告</p>
 * <p>Company: www.yyhweb.com</p>
 * <br><b>CopyRight: yyhweb[由由华网]</b>
 * @author stephen
 * @version YHBBS-2.0
 */
public class AnnounceTag extends TagSupport{
	
	private static final long serialVersionUID = 1L;
	
	private static Logger bbslog = Logger.getLogger(AnnounceTag.class.getName());
	
	public int doStartTag() throws JspException {
	    return 0;
	}
	public int doEndTag() throws JspException {
	     try {  
	    	 HttpServletRequest request = (HttpServletRequest)pageContext.getRequest();
	    	 int forumId = ReqUtils.getInt(request,"fId");
	    	 AnnceLink announce = AnnounceBiz.getNewAnnce(forumId);
	    	 String dateFM = Constants.dateFM;
	    	 StringBuffer sb = new StringBuffer();
	    	 sb.append("<table align=center cellSpacing=0 cellPadding=0 width=100%>");
		     sb.append("<tr><td width=30px>");
		     sb.append("<img src=webapp/images/announce.gif border=0 alt=论坛公告 >");
		     sb.append("</td><td>&nbsp");
		     sb.append("<marquee scrollamount=3 behavior=alternate onMouseOver='this.stop()' onMouseOut='this.start()'>");
		     if(announce==null){
		    	 sb.append("<a href=Announce.htm?fId=");
		    	 sb.append(forumId);
		    	 sb.append("&action=an><b>增加论坛公告</b></a>");
		     }else{
		    	 sb.append("<a href=Announce.htm?fId=");
		    	 sb.append(forumId);
		    	 sb.append("&action=an><b>"+announce.getTitle()+"</b></a>");
			     sb.append("&nbsp[");
			     sb.append(DateUtils.getStr2Str(dateFM,announce.getPosttime())+"]");
		     }
		     sb.append("</marquee>");
		     sb.append("</td></tr>");
		     sb.append("</table>"); 
		     JspWriter out = pageContext.getOut();
	    	 out.println(sb);
	    	 sb = null;
	     }catch(Exception e){
            bbslog.error("AnnounceTag tag's doEndTag error!");
         }
        return 6;
    }
}