java（2014）实现对mysql数据库分页的代码

package util;



import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.List;



/**

 * @author Hongyu

 * 

 * @param <T>

 */

public class Pagination<T> {

	// 当前页

	private Integer nowPage;

	// 页面要显示信息条数

	private Integer pageSize;

	// 根据页面显示的条数计算总页数

	private Integer countPage;

	// 根据传入的数据库查询数据库中的信息的条数

	private Integer total;

	// 向数据库查询时的开始的下标

	private Integer startIndex;

	// 向数据库查询时的查询条数

	private Integer endIndex;





	// 将查询到的数据存放到这里

	private List<T> rows;



	public Pagination(Integer nowPage, Integer pageSize, String tableName) {

		// 赋值

		this.nowPage = nowPage;

		this.pageSize = pageSize;



		// 判断当前页是否合法

		if (this.nowPage < 1) {

			this.nowPage = 1;

		}



		// 向数据库发送查询,查询出指定表格的数据的总数

		this.total = this.getCountSize(tableName);

		// 计算总页数

		this.countPage = this.total % this.pageSize == 0 ? this.total

				/ this.pageSize : this.total / this.pageSize + 1;



		if (this.nowPage > this.countPage) {

			this.nowPage = this.countPage;

		}



		//System.out.println("pagenation中的nowPage==========" + this.nowPage);

		// 计算出开始的记录下标,和每页要显示的条数



		if (this.nowPage == 0) {

			this.startIndex = this.nowPage * this.pageSize;

			this.endIndex = this.pageSize;

		} else {

			this.startIndex = (this.nowPage - 1) * this.pageSize;

			this.endIndex = this.pageSize;

		}



		/*System.out.println(this.startIndex + "======pagenation中的开始和结束========"

				+ this.endIndex+"====================总页数"+countPage);

*/

	}



	// 根据提供的表名向数据库发送请求,计算指定数据表中的数据总条数

	public Integer getCountSize(String tableName) {

		int countRecord = 0;

		String sql = "select count(*) as c from " + tableName;

		Connection conn = JdbcUtil.getConn();

		PreparedStatement pstmt = null;

		ResultSet rs = null;

		try {

			pstmt = conn.prepareStatement(sql);

			rs = pstmt.executeQuery();

			if (rs.next()) {

				countRecord = rs.getInt("c");

			}

		} catch (SQLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} finally {

			JdbcUtil.release(rs, pstmt);

		}

		return countRecord;

	}



	public List<T> getRows() {

		return rows;

	}



	public void setRows(List<T> rows) {

		this.rows = rows;

	}



	public Integer getStartIndex() {

		return startIndex;

	}



	public Integer getEndIndex() {

		return endIndex;

	}



	public Integer getTotal() {

		return total;

	}

	





}