jsp实现分页和页面跳转功能

      本文主要介绍在jsp中实现分页功能和页面跳转功能，能够实现数据的分页显示和跳转到指定页面的功能，具体效果如图

                       

由于该功能是一个书城项目的一部分，所以数据来源于该项目，具体数据库(数据库方面采用c3p0连接池，使用的是mysql数据库)文件可以在点击打开链接下载，整个项目可以在点击打开链接下载（不过由于使用的是MyeElipse2013,所以请使用此版本或者更高版本导入工程）。

下面具体介绍一下这个小功能

1. 这个项目的目录结构：

2.显示的数据主要是图书的相关信息因此Bean类是图书Book的相关信息即com.page.book.domain中Book类的相关信息如下

package com.page.book.domain;

import org.apache.log4j.Category;

public class Book {
	private String bid;//主键
	private String bname;//图名
	private String author;//作者
	private double price;//定价
	private double currPrice;//当前价
	private double discount;//折扣
	private String press;//出版社
	private String publishtime;//出版时间
	private int edition;//版次
	private int pageNum;//页数
	private int wordNum;//字数
	private String printtime;//刷新时间
	private int booksize;//开本
	private String paper;//纸质
	private Category category;//所属分类
	private String image_w;//大图路径
	private String image_b;//小图路径
	public String getBid() {
		return bid;
	}
	public void setBid(String bid) {
		this.bid = bid;
	}
	public String getBname() {
		return bname;
	}
	public void setBname(String bname) {
		this.bname = bname;
	}
	public String getAuthor() {
		return author;
	}
	public void setAuthor(String author) {
		this.author = author;
	}
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public double getCurrPrice() {
		return currPrice;
	}
	public void setCurrPrice(double currPrice) {
		this.currPrice = currPrice;
	}
	public double getDiscount() {
		return discount;
	}
	public void setDiscount(double discount) {
		this.discount = discount;
	}
	public String getPress() {
		return press;
	}
	public void setPress(String press) {
		this.press = press;
	}
	public String getPublishtime() {
		return publishtime;
	}
	public void setPublishtime(String publishtime) {
		this.publishtime = publishtime;
	}
	public int getEdition() {
		return edition;
	}
	public void setEdition(int edition) {
		this.edition = edition;
	}
	public int getPageNum() {
		return pageNum;
	}
	public void setPageNum(int pageNum) {
		this.pageNum = pageNum;
	}
	public int getWordNum() {
		return wordNum;
	}
	public void setWordNum(int wordNum) {
		this.wordNum = wordNum;
	}
	public String getPrinttime() {
		return printtime;
	}
	public void setPrinttime(String printtime) {
		this.printtime = printtime;
	}
	public int getBooksize() {
		return booksize;
	}
	public void setBooksize(int booksize) {
		this.booksize = booksize;
	}
	public String getPaper() {
		return paper;
	}
	public void setPaper(String paper) {
		this.paper = paper;
	}
	public Category getCategory() {
		return category;
	}
	public void setCategory(Category category) {
		this.category = category;
	}
	public String getImage_w() {
		return image_w;
	}
	public void setImage_w(String image_w) {
		this.image_w = image_w;
	}
	public String getImage_b() {
		return image_b;
	}
	public void setImage_b(String image_b) {
		this.image_b = image_b;
	}
}

3.dao层的实现

package com.page.book.dao;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import cn.itcast.jdbc.TxQueryRunner;

import com.page.book.domain.Book;
import com.page.pager.Expression;
import com.page.pager.PageBean;
import com.page.pager.PageConstants;

public class BookDao {
	private QueryRunner qr = new TxQueryRunner();
	
	/**
	 * 按分类查询
	 * @param cid
	 * @param pc
	 * @return
	 * @throws SQLException 
	 */
	public PageBean findByCategory(String cid, int pc) throws SQLException {
		List exprList = new ArrayList();
		exprList.add(new Expression("cid", "=", cid));
		return findByCriteria(exprList, pc);
	}
	


	
	/**
	 * 通用的查询方法
	 * @param exprList
	 * @param pc
	 * @return
	 * @throws SQLException 
	 */
	private PageBean findByCriteria(List exprList, int pc) throws SQLException {
		/*
		 * 1. 得到ps
		 * 2. 得到tr
		 * 3. 得到beanList
		 * 4. 创建PageBean，返回
		 */
		/*
		 * 1. 得到ps
		 */
		int ps = PageConstants.BOOK_PAGE_SIZE;//每页记录数
		/*
		 * 2. 通过exprList来生成where子句
		 */
		StringBuilder whereSql = new StringBuilder(" where 1=1"); 
		List