花了一上午简单研究了下自定义标签。就弄了个自定义的分页标签。代码没有怎么仔细优化。先贴上来，：）

1,标签的实现类numentag.java

import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;

import javax.servlet.jsp.jspexception;
import javax.servlet.jsp.jspwriter;
import javax.servlet.jsp.tagext.tagsupport;

/** *//**
 * 自定义的分页标签
 *
 * @author 马万林
 *
 */
public class numentag extends tagsupport {

    private string url = null;

    private result result;

    private string page = null;[iocblog.net 来源]

    private string[] p;

    private map kv = new hashmap();

    private list key = null;

    /** *//**
     * 分离参数
     * @param params
     */
    public void setparams(string params) {
        key = new arraylist();
        p = params.split(";");
        for (int i = 0; p.length>1&&i < p.length; i++) {
            kv.put(p[i].split(":")[0], p[i].split(":")[1]);
            key.add(p[i].split(":")[0]);
        }
    }

    /** *//**
     * 分页的结果
     * @param result
     */
    public void setresult(string result) {
        this.result = (result) pagecontext.getrequest().getattribute("result");
        this.page = (string) pagecontext.getrequest().getattribute("page");
    }

    public void seturl(string url) {
        this.url = url;
    }

    public int dostarttag() throws jspexception {
        stringbuffer sb = null;
        if (result != null && result.getcontent() != null
                && result.getcontent().size() > 0) {
            sb = new stringbuffer("分页: ");
            if (result.getpage().gethasprepage()){
                sb.append("<a href='").append(url);
                if (url.indexof("?") == -1)
                    sb.append("?page=1");
                else
                    sb.append("&page=1");
                linkparams(sb);
                sb.append("'>").append("首页").append("</a>").append(" | ");
                sb.append("<a href='").append(url);[iocblog.net 来源]
                if (url.indexof("?") == -1)
                    sb.append("?page=").append(
                            result.getpage().getpreviouspage());
                else
                    sb.append("&page=").append(
                            result.getpage().getpreviouspage());
                linkparams(sb);
                sb.append("'>").append("上页").append("</a>").append(" | ");
            }
            if (result.getpage().gethasnextpage()) {
                sb.append("<a href='").append(url);
                if (url.indexof("?") == -1)
                    sb.append("?page=").append(result.getpage().getnextpage());
                else
                    sb.append("&page=").append(result.getpage().getnextpage());
                linkparams(sb);
                sb.append("'>").append("下页").append("</a>").append(" | ");
                sb.append("<a href='").append(url);
                if (url.indexof("?") == -1)
                    sb.append("?page=").append(result.getpage().gettotalpage());
                else
                    sb.append("&page=").append(result.getpage().gettotalpage());
                linkparams(sb);
                sb.append("'>").append("尾页").append("</a>");
            }
            sb
                    .append(" 跳转到:<select name='gotopage' onchange='javascript:gopage(this.value)'>");
            int s = result.getpage().gettotalcount();
            for (int i = 1; i <= s; i++) {
                sb.append("<option value=").append(i);
                if (integer.parseint(page) == i)
                    sb.append(" selected");
                sb.append(">第").append(i).append("页</option>");
            }
            sb.append("</select>");
            sb.append("<script language=javascript>");
            sb.append("function gopage(page){").append("window.location='")
                    .append(url);
            if (url.indexof("?") == -1)
                sb.append("?page='+").append("page");
            else
                sb.append("&page='+").append("page");
            sb.append("+'");
            linkparams(sb);
            sb.append("';");
            sb.append("}");
            sb.append("</script>");
        }
        try {
            if (sb != null) {
                jspwriter out = pagecontext.getout();
                out.print(sb);
            }
        } catch (exception e) {
            throw new jspexception(e);
        }
        return eval_page;
    }
   
    /** *//**
     * 链接参数处理
     * @param sb
     */
    private void linkparams(stringbuffer sb) {
        for (int i = 0; i < key.size(); i++) {
            sb.append("&").append(key.get(i)).append("=").append(
                    kv.get(key.get(i)));
        }
    }

}
 

2,标签定义文件numentag.tld

<?xml  version="1.0"  encoding="utf-8"  ?>
 <!doctype taglib public "-//sun microsystems, inc.//dtd jsp tag library 1.2//en" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
    <tlib-version>1.0</tlib-version>
    <jsp-version>1.2</jsp-version>
    <short-name>numen</short-name>
    <!--outputtag-->
    <tag>
        <name>out</name>
        <tag-class>cn.cityyouth.util.numentag</tag-class>
        <body-content>empty</body-content>
        <attribute>
            <name>url</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>result</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>params</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
    </tag>
</taglib>

3.js

<%@ page contenttype="text/html; charset=utf-8"%>
<%@ include file="/common/taglibs.jsp"%>
<%@ taglib  uri="/web-inf/numentag.tld"  prefix="n"%>
<html>
<head>
</head>
<body>
<table>
<tr><td>
<n:out url="test.do" result="result" params="${type}"/>
</td></tr>
</table>
</body>
</html>
http://blog.csdn.net/numen_wlm/archive/2007/01/30/1497778.aspx