javaweb分页

前端使用分页组件mricode+artTemplate

数据库

drop database if exists jdbc;
CREATE DATABASE IF NOT EXISTS jdbc;
USE jdbc;

drop table if exists user ;
CREATE TABLE IF NOT EXISTS `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) DEFAULT NULL ,
  `pwd` varchar(50) DEFAULT NULL ,
  PRIMARY KEY (`id`)
) ;
#数据初始化
insert into user(name,pwd) values ('a1' ,'123456' );
insert into user(name,pwd) values ('a2' ,'123456' );
insert into user(name,pwd) values ('a3' ,'123456' );
insert into user(name,pwd) values ('a21' ,'123456' );
insert into user(name,pwd) values ('a22' ,'123456' );
insert into user(name,pwd) values ('a23' ,'123456' );
insert into user(name,pwd) values ('a31' ,'123456' );
insert into user(name,pwd) values ('a32' ,'123456' );
insert into user(name,pwd) values ('a33' ,'123456' );

后端代码
实体类
User.java

public class User {
    private int id;
    private String name;
    private String pwd;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
}

PageDataModel.java

public class PageDataModel {
    private int total;
    private List list;

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }
}

DBUtils.java

package util;

import java.sql.*;


public class DBUtils {
    static{
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    public static Connection getConnection() throws SQLException{
        String url = "jdbc:mysql://localhost/jdbc?useUnicode=true&characterEncoding=UTF-8";
        Connection conn = DriverManager.getConnection(url,"root","root");
        return conn;
    }
    public static void close(Statement st,Connection conn){
        try{
            if(st != null){
                    try {
                        st.close();
                    } catch (SQLException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
            }
        }finally{
            if(conn != null){
                try {
                    conn.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
    public static void close(ResultSet rs,Statement st,Connection conn){
        try{
            if(rs != null){
                try {
                    rs.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }finally{
            try{
                if(st != null){
                        try {
                            st.close();
                        } catch (SQLException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                }
            }finally{
                if(conn != null){
                    try {
                        conn.close();
                    } catch (SQLException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}

pageServlet2.java

@WebServlet(name = "pageServlet2",urlPatterns = "/page.action")
public class pageServlet2 extends HttpServlet {


    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {


        String strPageIndex = request.getParameter("pageIndex");
        System.out.println(strPageIndex);
        int nPageIndex = Integer.parseInt(strPageIndex);

        String strPageSize = request.getParameter("pageSize");
        System.out.println(strPageSize);
        int nPageSize = Integer.parseInt(strPageSize);

        IUserInfoService iuis = UserInfoServiceImpl.getInstance();
        List lstUser = iuis.GetAllUsersPaged(nPageIndex,nPageSize);
        int nCount = iuis.GetPagedDataCount();

        PageDataModel p = new PageDataModel();
        p.setTotal(nCount);
        p.setList(lstUser);
        String strJson = JSON.toJSONString(p);
        response.getWriter().println(strJson);
    }
}

IUserInfoService.java

public interface IUserInfoService {
    List GetAllUsersPaged(int nPageIndex, int nPageSize);
    int GetPagedDataCount();
}

UserInfoServiceImpl.java

package Service.ServiceImpl;

import Dao.DaoImpl.UserInfoDaoImpl;
import Dao.IUserInfoDao;
import Service.IUserInfoService;
import util.User;

import java.util.List;


public class UserInfoServiceImpl implements IUserInfoService {

    private static UserInfoServiceImpl userInfoServiceImpl = new UserInfoServiceImpl();
    private UserInfoServiceImpl()
    {
        ;
    }

    public static UserInfoServiceImpl getInstance()
    {
        return userInfoServiceImpl;
    }

    @Override
    public List GetAllUsersPaged(int nPageIndex, int nPageSize) {
        IUserInfoDao iuid = new UserInfoDaoImpl();
        List lst = iuid.GetAllUsersPaged(nPageIndex,nPageSize);
        return lst;
    }

    @Override
    public int GetPagedDataCount() {
        IUserInfoDao iuid = new UserInfoDaoImpl();
        int nCount = iuid.GetPagedDataCount();
        return nCount;
    }
}

IUserInfoDao.java

public interface IUserInfoDao {
    List GetAllUsersPaged(int nPageIndex, int nPageSize);
    int GetPagedDataCount();
}

UserInfoDaoImpl.java

package Dao.DaoImpl;

import Dao.IUserInfoDao;
import util.DBUtils;
import util.User;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;


public class UserInfoDaoImpl implements IUserInfoDao {

    @Override
    public List GetAllUsersPaged(int nPageIndex, int nPageSize) {
        Connection con = null;
        PreparedStatement ps = null;
        List lst = new ArrayList();
        StringBuilder sb = new StringBuilder();
        try {
            con = DBUtils.getConnection();
            sb.append("select * FROM USER where 1 = 1 ");


            sb.append(" limit ?, ?");
            ps = con.prepareStatement(sb.toString());

            ps.setInt(1,nPageIndex*nPageSize);
            ps.setInt(2,nPageSize);




            ResultSet rs = ps.executeQuery();

            while(rs.next())
            {
                User ui = new User();
                ui.setId(rs.getInt(1));
                ui.setName(rs.getString(2));
                ui.setPwd(rs.getString(3));

                lst.add(ui);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            DBUtils.close(ps,con);

        }
        return lst;
    }

    @Override
    public int GetPagedDataCount() {
        Connection con = null;
        PreparedStatement ps = null;
        int nCount = 0;
        StringBuilder sb = new StringBuilder();
        try {
            con = DBUtils.getConnection();
            sb.append("select count(*) FROM user where 1 = 1 ");
           
            ps = con.prepareStatement(sb.toString());
           
            ResultSet rs = ps.executeQuery();
            if(rs.next())
                nCount = rs.getInt(1);


        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            DBUtils.close(ps,con);

        }
        return nCount;
    }
}