displaytag.java

本代码是点歌系统的部分代码实现了部分功能

package music.util;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

public final class DisplayTag extends TagSupport {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public int doEndTag() throws JspException {
		System.out.println("start====================");
		JspWriter out = pageContext.getOut();
		HttpServletRequest request = (HttpServletRequest) pageContext
				.getRequest();
		String strPage = request.getParameter("page");
		int page;
		if (strPage == null || strPage.equals(""))
			page = 1;
		else {
			page = Integer.parseInt(strPage);
		}

		try {
			int pageSize = 2;
			out.println("<table width=\"80%\" border=\"1\" align=\"center\"");
			out.println("<tr align=\"right\" bgcolor=\"#CCFF66\">");
			out.println("<th colspan=\"4\">");
			out.println("<a href=\"noticelistjsp.do?page=-1\">首页</a> ");
			out.println("<a href=\"noticelistjsp.do?page=-2\">上一页</a> ");
			out.println("<a href=\"noticelistjsp.do?page=1\">1</a> ");
			out.println("<a href=\"noticelistjsp.do?page=2\">2</a> ");
			out.println("<a href=\"noticelistjsp.do?page=3\">3</a>  ");
			out.println("<a href=\"noticelistjsp.do?page=-3\">下一页</a> ");
			out.println("<a href=\"noticelistjsp.do?page=-4\">尾页</a></th>");
			out.println("</tr>");
			out.println("</table>");
		} 
		catch (Exception ex) {
			System.out.println("erro====================");
			throw new JspTagException("IOException:" + ex.toString());
		}
		return super.doEndTag();
	}
}