java项目实例子-科研信息发布平台

package cn.edu.bit.taglib; import java.util.Vector; import javax.servlet.http.HttpServletRequest; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.TagSupport; import cn.edu.bit.DBQuery.DataProcess; import cn.edu.bit.Object.News; /** * * @author liuyu *2007-7-21 */ public class NewsTag extends TagSupport{ public int doEndTag() throws JspException { JspWriter out = pageContext.getOut(); HttpServletRequest request = (HttpServletRequest) pageContext.getRequest(); String str = (String) request.getQueryString(); int page; if (str == null || str.equals("")) page = 1; else { // 根据‘=’来析取参数值 String[] aa = str.split("="); page = Integer.parseInt(aa[1]); } try { String strSql = new String("select * from news order by datetime desc"); // search方法会把结果集中指定页的内容按行储存到Bean中， //--------------------------------------------------------------- int count = DataProcess.nCount(strSql); int totalPages = 0; if(count%5==0) { totalPages=count/5; } else { totalPages = count/5+1; } int currentPage=1; if(page<=0) { currentPage=1; } else if(page>totalPages) { currentPage=totalPages; } else { currentPage = page; } //---------------------------------------------------------- // 并将这些Bean保存在容器类中，然后返回 Vector Items = News.search(strSql, page); out.println("<table width=\"75%\" border=\"0\" cellspacing=\"1\" cellpadding=\"1\" class=\"tableBorder\">" ); out.println("<tr>"); out.println("<td colspan=\"2\" align=\"center\" background=\"../../images/guanli/admin_bg_1.gif\" class=\"whitenormal\">新闻管理</td>"); out.println("</tr>"); for (int i = 0; i < Items.size(); i++) { News bean = (News) Items.elementAt(i); out.println("<tr>"); out.println("<td width=\"72%\" bgcolor=\"E4EDF9\" class=\"normalText\">"+bean.getTitle()+"</td>"); out.println("<td width=\"28%\" align=\"right\" bgcolor=\"E4EDF9\"><a href=\"/Lab/guanli/news/edit_news.jsp?news_id="+bean.getId()+"\">[编辑]</a>" + "&nbsp;<a href=\"/Lab/guanli/news/delete_news.jsp?news_id="+bean.getId()+" \"onclick=\"{if(confirm(\'确定删除吗?\')){return true;}return false;}\">[删除]</a></td>"); out.println("</tr>"); out.println("<tr>"); out.println("<td colspan=\"2\" bgcolor=\"F1F3F5\" class=\"normalText\">"+bean.getContent()+"</td>"); out.println("</tr>"); out.println("<tr>"); out.println("<td colspan=\"2\">&nbsp;</td>"); out.println("</tr>"); } out.println("<tr>"); out.println("<td colspan=\"2\"><table width=\"100%\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\" bgcolor=\"E4EDF9\">"); out.println("<tr class=\"normalText\">"); out.println("<td>页次:"+currentPage+"/"+totalPages+"页&nbsp;每页5 总数"+count+"</td>"); out.println("<td align=\"right\">分页:"); if(page!=-1){ out.println("<a href=\"news_list.jsp?arg1=-1\">首页</a> "); } out.println("<a href=\"news_list.jsp?arg2=-2\">上一页</a> "); out.println("<a href=\"news_list.jsp?arg3=-3\">下一页</a> "); if(page!=-4){ out.println("<a href=\"news_list.jsp?arg4=-4\">尾页</a></td>"); } out.println("</tr>"); out.println("</table></td>"); out.println("</tr>"); out.println("</table>"); } catch(Exception e) { e.printStackTrace(); } return SKIP_BODY; } }