jsp 自定义分页标签

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;    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);                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' οnchange='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 >