jsp 自定義分頁標簽

花了一上午簡單研究了下自定義標簽。就弄了個自定義的分頁標簽。代碼沒有怎麼仔細優化。先貼上來，：）

1,標簽的實現類NumenTag.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.jsp(SUN企業級應用的首選).jsp(SUN企業級應用的首選)Exception;
import javax.servlet.jsp(SUN企業級應用的首選).jsp(SUN企業級應用的首選)Writer;
import javax.servlet.jsp(SUN企業級應用的首選).tagext.TagSupport;

/** *//**
 * 自定義的分頁標簽
 *
 * @author 馬萬林
 *
 */
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;

    /** *//**
     * 分離參數
     * @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]);
        }
    }

    /** *//**
     * 分頁的結果
     * @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 jsp(SUN企業級應用的首選)Exception {
        StringBuffer sb = null;
        if (result != null && result.getContent() != null
                && result.getContent().size() > 0) {
            sb = new StringBuffer("分頁: ");
            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("首頁").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("上頁").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("下頁").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("尾頁").append("</a>");
            }
            sb
                    .append(" 跳轉到:<select name=goToPage onchange=javascript:goPage(this.value)>");
            int s = result.getPage().getTo