Java实现分页代码

Java实现分页代码

在项目中，分页是一个项目中必不可少的，它可以防止我们从数据库中进行大量数据查询时速度变慢，提高我们的查询效率。

1、定义分页模型：PageModel

package com.common.page;

import java.util.List;

/**

* 封装分页信息

* @author Administrator

*

*/

public class PageModel {

//结果集

private List list;

//查询记录数

private int totalRecords;

//每页多少条数据

private int pageSize;

//第几页

private int pageNo;

/**

* 总页数

* @return

*/

public int getTotalPages() {

return (totalRecords + pageSize - 1) / pageSize;

}

/**

* 取得首页

* @return

*/

public int getTopPageNo() {

return 1;

}

/**

* 上一页

* @return

*/http://

public int getPreviousPageNo() {

if (pageNo <= 1) {

return 1;

}

return pageNo - 1;

}

/**

* 下一页

* @return

*/

public int getNextPageNo() {

if (pageNo >= getBottomPageNo()) {

return getBottomPageNo();

}

return pageNo + 1;

}

/**

* 取得尾页

* @return

*/

public int getBottomPageNo() {

return getTotalPages();

}

public List getList() {

return list;

}

public void setList(List list) {

this.list = list;

}

public int getTotalRecords() {

return totalRecords;

}

public void setTotalRecords(int totalRecords) {

this.totalRecords = totalRecords;

}

publicblEMC int getPageSize() {

return pageSize;

}

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}

public int getPageNo() {

return pageNo;

}

public void setPageNo(int pageNo) {

this.pageNo = pageNo;

}

}

2、分页测试：在mysql中建立admin表，里面有字段id、name、password

3、简历Admin的实体bean类：

package com.common.page;

public class Admin {

private int id;

private String name;

private String password;

public int getId() {

return id;

}

public blEMCvoid setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

}

4、测试调用：

package com.common.page;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import com.common.db.DbUtil;

public class Client {

public static PageModel findAdmins(int pageNo,int pageSize){

Connection conn=DbUtil.getConnection();

String sql="select * from admin limit ?,?";

PageModel pageModel=null;

PreparedStatement pstm=null;

ResultSet rs=null;

Admin admin=null;

List list=new ArrayList();

try {

pstm=conn.prepareStatement(sql);

pstm.setInt(1, (pageNo-1)*pageSize);

pstm.setInt(2, pageNo*pageSize);

rs=pstm.executeQuery();;

while(rs.next()){

admin=new Admin();

admin.setId(rs.getInt("a_id"));

admin.setName(rs.getString("a_name"));

admin.setPassword(rs.getString("a_pwd"));

list.add(admin);

}

ResultSet rs2=pstm.executeQuery("select count(*) from admin");

int total=0;

if(rs2.next()){

total=rs2.getInt(1);

}

pageModel=new PageModel();

pageModel.setPageNo(pageNo);

pageModel.setPageSize(pageSize);

pageModel.setTotalRecords(total);

pageModel.setList(list);

} catch (SQLException e) {

e.printStackTrace();

}finally{

DbUtil.close(conn);

DbUtil.close(pstm);

DbUtil.close(rs);

}

return pageModel;

}

public static void main(String[] args) {

PageModel pageModel=Client.findAdmins(2,4);

List list=pageModel.getList();

for(Admin a:list){

System.out.print("ID:"+a.getId()+",用户名:"+a.getName()+",密码:"+a.getPassword());

System.out.println();

}

System.out.print("当前页:"+pageModel.getPageNo()+" ");

System.out.print("共"+pageModel.getTotalPages()+"页 ");

System.out.print("首页:"+pageModel.getTopPageNo()+" ");

System.out.print("上一页:"+pageModel.getPreviousPageNo()+" ");

System.out.print("下一页:"+pageModel.getNextPageNo()+" ");

System.out.print("尾页:"+pageModel.getBottomPageNo()+" ");

System.out.print("共"+pageModel.getTotalRecords()+"条记录");

System.out.println();

}

}

这样分页效果就实现了，我们要实现分页效果，只要传入相应的参数和相应的数据库执行语句即可实现，希望大家能灵活运用。

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