newstag4guest.java

java语言编写的程序

package cn.lab.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.lab.dbquery.DataProcess;
import cn.lab.object.News;

public class NewsTag4guest 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{
			String[] aa = str.split("=");
			page = Integer.parseInt(aa[1]);
		}
		try
		{
			String strSql = new String("select * from news order by datetime desc");
			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;
			}
			
			Vector Items = News.search(strSql, page);
			
			out.println("<table width=\"100%\"border=\"0\"cellspacing=\"1\"cellpadding=" +
					"\"1\"class=\"tableBorder\">");
			for(int i = 0;i<Items.size();i++)
			{
				News bean = (News) Items.elementAt(i);
				out.println("<tr>");
				out.println("<td bgcolor=\"E4EDF9\"class=\"normalText\">"+bean.getTitle()
						+"</td>");
				
				out.println("</tr>");
				out.println("<tr>");
				out.println("<td bgcolor=\"F1F3F5\"class=\"normalText\">"+bean.getContent()
						+"</td>");
				
				out.println("</tr>");
				out.println("<tr>");
				out.println("<td>&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：");
			out.println("<a href=\"index.jsp?arg1=-1\">首页</a> ");
			out.println("<a href=\"index.jsp?arg1=-2\">上一页</a> ");
			out.println("<a href=\"index.jsp?arg1=-3\">下一页</a> ");
			out.println("<a href=\"index.jsp?arg1=-4\">尾页</a> ");
			out.println("</tr>");
			out.println("</table></td>");
			out.println("</tr>");
			out.println("</table>");			
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		return SKIP_BODY;
	}

}