java 自定义标签

public class PageTag extends TagSupport {

private static final long serialVersionUID = 1L;

 /* 当前页 */
 private String curPage;

 /* 总页数 */
 private String totalPage;

 /* 页大小(一页显示的大小) */
 private String pageSize;

 /* 页面url */
 private String url;

 public void setCurPage(String curPage) {
  this.curPage = curPage;
 }

 public void setPageSize(String pageSize) {
  this.pageSize = pageSize;
 }

 public void setTotalPage(String totalPage) {
  this.totalPage = totalPage;
 }

 public void setUrl(String url) {
  this.url = url;
 }

 @Override
 public int doStartTag() throws JspException {
  JspWriter out = pageContext.getOut();
  // 得到分页后的页数,(总页数/页大小)+1
  if (pageSize == null || pageSize == "") {
   pageSize = "1";
  }

  // int pageNumber = (Integer.parseInt(totalPage) / Integer
  // .parseInt(pageSize));

  if (Integer.parseInt(curPage) > Integer.parseInt(totalPage)) {
   curPage = String.valueOf(totalPage);
  }

  if (Integer.parseInt(curPage) < 1) {
   curPage = "1";
  }

  // 显示给用户操作的页面开始端
  int start = Integer.parseInt(curPage) - 2;

  // 显示给用户操作的页面结束端
  int end = Integer.parseInt(curPage) + 2;

  // 特殊情况处理(开始端小于0)
  if ((Integer.parseInt(curPage) - 2) <= 0) {
   start = 1;
  }
  // 特殊情况处理(结束端大于总页数)
  if ((Integer.parseInt(curPage) + 2) > Integer.parseInt(totalPage)) {
   end = Integer.parseInt(totalPage);
  }
  if ((end <= 5) && (Integer.parseInt(totalPage) >= 5)) {
   end = 5;
  }
  if (((end - start) <= 5) && (Integer.parseInt(totalPage) >= 5)) {
   start = end - 4;
  }
  try {
   // 取得action的url
   String actionUrl = "";
   if (url.indexOf("?") != -1) {
    actionUrl = url.substring(0, url.indexOf("?"));
   }
   StringBuilder html = new StringBuilder();

   // 当前页输入框的验证
   html.append("<script type=\"text/javascript\">");
   html.append("$(function() {");
   html.append("$(\"#pageTagForm\").validate({");
   html.append("rules : {");
   html.append("curpage : {");
   html.append("required : true,");
   html.append("digits : true");
   html.append("}");
   html.append("},");
   html.append("messages : {");
   html.append("curpage : {");
   html.append("required : \"\",");
   html.append("digits : \"\"");
   html.append("}");
   html.append("}");
   html.append("});");
   html.append("});");
   html.append("</script>");

   html.append(" <form id=\"pageTagForm\" action=\""
     + ((url.indexOf("?") == -1) ? url : actionUrl)
     + "\" method=\"get\" >");
   html.append(" <table align=\"right\">");
   html.append(" <tr height=\"10\" align=\"right\" >");
   html.append(" <td width=\"110\" align=\"center\">");
   html.append(" <a href=\"" + url
     + ((url.indexOf("?") == -1) ? "?" : "&&")
     + "curpage=1\">[首页]</a>");
   html.append(" <a href=\"" + url
     + ((url.indexOf("?") == -1) ? "?" : "&&") + "curpage=");
   html.append((((Integer.parseInt(curPage) - 1) == 0) ? curPage
     : (Integer.parseInt(curPage) - 1)));
   html.append("\">[上一页]</a></td><td width=\"110\" align=\"center\">");
   for (int i = start; i <= end; i++) {
    if (i != Integer.parseInt(curPage)) {
     html.append("<a href=\"" + url
       + ((url.indexOf("?") == -1) ? "?" : "&&")
       + "curpage=" + i + "\">");
     html.append("[" + i + "]</a>  ");
    } else {
     html.append("<b>" + i + "</b>");
    }
   }
   html.append(" </td><td width=\"110\" align=\"center\"><a href=\""
     + url + ((url.indexOf("?") == -1) ? "?" : "&&")
     + "curpage=");
   html.append((((Integer.parseInt(curPage) + 1) > Integer
     .parseInt(totalPage)) ? curPage : (Integer
     .parseInt(curPage) + 1)));
   html.append("\">[下一页]</a><a href=\"" + url
     + ((url.indexOf("?") == -1) ? "?" : "&&") + "curpage=");
   html.append(totalPage + "\">[末页]</a>");
   html.append("</td><td width=\"110\">");
   html.append("<input id=\"curpage\" name=\"curpage\" style=\"width:20px;height:15px;\" />");
   html.append("<input name=\"totalpage\" type=\"hidden\" value=\""
     + totalPage + "\" style=\"width:20px;height:15px;\" />");
   html.append("<input name=\"id\" type=\"hidden\" value=\""
     + ((url.indexOf("?") == -1) ? 0 : (url.substring(url
       .indexOf("=") + 1)))
     + "\" style=\"width:20px;height:15px;\" />");
   html.append("<input type=\"submit\" value=\"go\"/></td></tr></table></form>");
   out.print(html.toString());
  } catch (IOException e) {
   e.printStackTrace();
  }
  return super.doStartTag();
 }

}

 

1、在工程WEB-INF目录下创建pageTag.tld（详细查看附件）文件；

 

2、页面引用：

<%@ taglib prefix="page" uri="/WEB-INF/pageTag.tld"%>

<page:outpage url="" pageSize=""
      totalPage="" curPage=""></page:outpage>