JSP自定义分页标签TAG

首先我们需要在WEB-INF/tld/目录下创建page.tld文件

	1.0
	jsp-version>1.2
	page
	https://www.kevin.com/taglibs/page
	
		htmlPage
		com.lss.common.tag.PageTag
		JSP
		htmlPage Tag
		
			pageNo
			false
			true
		
		
			pageSize
			false
			true
		
		
			totalSum
			true
			true
		
		
			url
			true
			true
		
		
			showPage
			false
			true
		
	

package com.lss.common.tag;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import com.lss.common.page.HtmlPage;
import com.lss.common.page.Page;
import com.lss.common.page.VariablePage;

/**
 * 分页处理标签
 * 
 * @description
 * @DATE 2012-3-11下午09:08:46
 */
public class PageTag extends TagSupport {
	private int pageNo;
	private int pageSize = 10;
	private int totalSum;
	private int showPage = 10;
	private String url;

	public int getPageNo() {
		return pageNo;
	}

	public void setPageNo(int pageNo) {
		this.pageNo = pageNo;
	}

	public int getPageSize() {
		return pageSize;
	}

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

	public int getTotalSum() {
		return totalSum;
	}

	public void setTotalSum(int totalSum) {
		this.totalSum = totalSum;
	}

	public int getShowPage() {
		return showPage;
	}

	public void setShowPage(int showPage) {
		this.showPage = showPage;
	}

	public String getUrl() {
		return url;
	}

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

	@Override
	public int doEndTag() throws JspException {
		if (pageSize == 0) {
			return TagSupport.SKIP_PAGE;// 不显示分页
		} else if (pageSize > totalSum) {
			return TagSupport.SKIP_BODY;// 不显示分页
		}
		JspWriter out = pageContext.getOut();
		try {
			if (url.indexOf(";jsessionid=") == -1) {
				if (url.indexOf("?") == -1) {
					url += ";jsessionid=" + pageContext.getSession().getId() + "?pageNo=";
				} else {
					url = url.replaceFirst("\\?", ";jsessionid=" + pageContext.getSession().getId() + "?");
					if (url.indexOf("pageNo=") == -1) {
						url += "&pageNo=";
					}
				}
			}
			url = pageContext.getServletContext().getContextPath() + url;
			VariablePage variablePage = new VariablePage(pageNo, totalSum, pageSize, url);
			variablePage.setShowPageNum(showPage);
			Page page = new HtmlPage(variablePage);
			out.print(page.getFirstNo() + "  " + page.getBackpageNum() + "  " + page.pagination() + "  " + page.getNextpageNum() + "  " + page.getLastNo());
		} catch (IOException ex) {
			ex.printStackTrace();
		}
		return super.doEndTag();
	}

	@Override
	public void release() {
		url = null;
		pageNo = 0;
		totalSum = 0;
		pageSize = 10;
		super.release();
	}

	private static final long serialVersionUID = -2642907859641024483L;
}

/**
 * HTML 分页类
 * 
 * @description
 * @DATE 2012-3-11下午10:33:14
 */
public class HtmlPage extends Page {
	public HtmlPage(VariablePage variablePage) {
		super(variablePage);
	}

	public String pagination() {
		String printNo = "";
		// 如果已分页；并且页数小于等于要显示的页数
		if (variablePage.totalPage > 1 && variablePage.totalPage  1 && variablePage.totalPage > variablePage.showPageNum) {
			if (variablePage.pageNo == 1) {// 当前页等于第一页
				return fromFirstPagePrint();
			} else if (variablePage.pageNo == variablePage.totalPage) {// 当前页等于最后一页
				return fromLastPagePrint();
			} else {// 如果当前页：即不是首页也不是尾页
				if (variablePage.showPageNum % 2 == 0) {// 可以平分页码
					int print$No = variablePage.showPageNum / 2;
					if (variablePage.pageNo >= print$No) {
						int index$No = variablePage.pageNo - print$No;
						if (variablePage.pageNo + print$No >= variablePage.totalPage) {
							return fromLastPagePrint();
						} else {
							if (index$No == 0)
								index$No = 1;
							for (int i = index$No; i = print$No && variablePage.pageNo + print$No = variablePage.totalPage) {
			return buildSpan("下一页", variablePage);
		} else {
			return buildA("下一页", variablePage.url + (variablePage.pageNo + 1));
		}
	}

	public String buildSpan(String text, VariablePage variablePage) {
		return "" + text + "";
	}

	public String buildA(String text, String url) {
		return "" + text + "";
	}

	public String buildA(VariablePage variablePage, int num) {
		return ("" + num + "");
	}
}

public abstract class Page {
	protected VariablePage variablePage;

	public Page(VariablePage variablePage) {
		this.variablePage = variablePage;
		calculateTotalPage();
	}

	public int getStartIndex() {
		return (getValidpageNum() - 1) * variablePage.pageSize;
	}

	public String getBackpageNum() {
		if (variablePage.pageNo = variablePage.totalPage) {
			return buildSpan("下一页", variablePage);
		} else {
			return buildA("下一页", variablePage.getUrl() + (variablePage.pageNo + 1));
		}
	}

	/**
	 * 计算总页数
	 */
	private void calculateTotalPage() {
		if (variablePage.totalSum % variablePage.pageSize == 0) {
			variablePage.totalPage = variablePage.totalSum / variablePage.pageSize;
		} else {
			variablePage.totalPage = variablePage.totalSum / variablePage.pageSize + 1;
		}
		if (variablePage.totalPage  1 && variablePage.totalPage > 1) {
			return true;
		}
		return false;
	}

	public String getLastNo() {
		if (isExistsPagination()) {
			return buildA("尾页", variablePage.url + variablePage.totalPage);
		} else {
			return buildSpan("尾页", variablePage);
		}
	}

	protected int getValidpageNum() {
		if (variablePage.totalPage 0){
			builder.append(" value='"+pageSize+"' ");
		}
		builder.append("/>条");
		return builder.toString();
	}
}

/**
 * 分页基础变量
 * 
 * @description
 * @DATE 2012-3-11下午10:34:00
 */
public class SimpleVariable {
	/**
	 * 显示页码
	 */
	protected int showPageNum = 10;
	/**
	 * 连接URL
	 */
	protected String url = null;
	/**
	 * 当前页码
	 */
	protected int pageNo = 1;
	/**
	 * 总页码
	 */
	protected int totalPage = 1;
	/**
	 * 总条数
	 */
	protected int totalSum = 0;
	/**
	 * 每页显示条数
	 */
	protected int pageSize = 10;

	public String getUrl() {
		return url;
	}

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

	public int getTotalPage() {
		return totalPage;
	}

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

	public int getTotalSum() {
		return totalSum;
	}

	public void setTotalSum(int totalSum) {
		this.totalSum = totalSum;
	}

	public int getPageSize() {
		return pageSize;
	}

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

	public int getShowPageNum() {
		return showPageNum;
	}

	public void setShowPageNum(int showPageNum) {
		this.showPageNum = showPageNum;
	}

	public int getPageNo() {
		return pageNo;
	}

	public void setPageNo(int pageNo) {
		this.pageNo = pageNo;
	}
}

/**
 * 分页变量
 * 
 * @description
 * @DATE 2012-3-11下午10:34:08
 */
public class VariablePage extends SimpleVariable {
	protected String split = "  ";
	protected String style = "class='page'";

	public VariablePage(int pageNo, int totalSum, int pageSize, String url) {
		pageNo = pageNo 

#需要使用该分页标签的JSP 使用方法如下：

JSP 头部引入

"https://www.kevin.com/taglibs/page" prefix="page" %>

使用以下标签生成分页HTML代码

"${pageNo}" url="your_url" totalSum="${totalSum}" showPage="10" pageSize="12"/>