使用Jsp/Js/Ajax/Json/Jquery/Easyui + Servlet + JDBC + Lucene/Mysql/Oracle完成数据库分页

package loaderman.action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.LinkedHashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import loaderman.entity.Page;
import loaderman.service.impl.EmpService;
import loaderman.service.inter.IEmpService;
import net.sf.json.JSONArray;



/**
 * 员工管理模块
 * 控制器
 */
public class EmpServlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
        this.doPost(request,response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
        try {
            //设置编号方式
            request.setCharacterEncoding("UTF-8");

            //获取客户端传入的参数
            String strPage = request.getParameter("page");//rows
            if(strPage == null || strPage.trim().length()==0){
                strPage = "1";
            }
            Integer currPageNO = Integer.parseInt(strPage);

            //调用业务层
            IEmpService iEmpService = new EmpService();
            Page page = iEmpService.show(currPageNO);

            //创建Map集合
            Map<String,Object> map = new LinkedHashMap<String,Object>();
            map.put("total",page.getAllRecordNO());
            map.put("rows",page.getEmpList());

            //使用第三方工具将map转成json文本
            JSONArray jsonArray = JSONArray.fromObject(map);
            String jsonJAVA = jsonArray.toString();

            //去掉二边的空格
            jsonJAVA = jsonJAVA.substring(1,jsonJAVA.length()-1);
            System.out.println("jsonJAVA=" + jsonJAVA);

            //以字符流的方式，将json字符串输出到客户端
            response.setContentType("text/html;charset=UTF-8");
            PrintWriter pw = response.getWriter();
            pw.write(jsonJAVA);
            pw.flush();
            pw.close();

        }catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package loaderman.dao.impl;

import java.math.BigDecimal;
import java.util.List;

import loaderman.dao.inter.IEmpDao;
import loaderman.entity.Emp;
import loaderman.util.JdbcUtil;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;


/**
 * 员工管理模块
 * 持久层实现
 */
public class EmpDao implements IEmpDao{
    public Integer getAllRecord() throws Exception {
        QueryRunner runner = new QueryRunner(JdbcUtil.getDataSource());
        String sql = "SELECT COUNT(EMPNO) FROM EMP";
        BigDecimal bigDecimal = (BigDecimal) runner.query(sql,new ScalarHandler());
        return bigDecimal.intValue();
    }
    public List<Emp> findAllRecord(int start, int end) throws Exception {
        QueryRunner runner = new QueryRunner(JdbcUtil.getDataSource());
        String sql = " SELECT XX.EMPNO,XX.ENAME,XX.JOB,XX.MGR,XX.HIREDATE,XX.SAL,XX.COMM,XX.DEPTNO" +
                " FROM (SELECT ROWNUM ID,EMP.* FROM EMP WHERE ROWNUM<?) XX" +
                " WHERE ID>?";
        Object[] params = {end,start};
        return runner.query(sql,new BeanListHandler<Emp>(Emp.class),params);
    }









    public static void main(String[] args) throws Exception{
        EmpDao dao = new EmpDao();
        System.out.println("共有" + dao.getAllRecord() + "个员工");
        System.out.println("------------------------------------------------第1页");
        for(Emp e : dao.findAllRecord(0,4)){
            System.out.println(e);
        }
        System.out.println("------------------------------------------------第2页");
        for(Emp e : dao.findAllRecord(3,7)){
            System.out.println(e);
        }
        System.out.println("------------------------------------------------第3页");
        for(Emp e : dao.findAllRecord(6,10)){
            System.out.println(e);
        }
        System.out.println("------------------------------------------------第4页");
        for(Emp e : dao.findAllRecord(9,13)){
            System.out.println(e);
        }
        System.out.println("------------------------------------------------第5页");
        for(Emp e : dao.findAllRecord(12,16)){
            System.out.println(e);
        }
    }
}

package loaderman.dao.inter;

import loaderman.entity.Emp;

import java.util.List;


/**
 * 员工管理模块
 * 持久层接口
 */
public interface IEmpDao {
    /**
     * 获取总记录数
     * @return 总记录数
     */
    public Integer getAllRecord() throws Exception;
    /**
     * 分批查询所有记录
     * @param start 表示 从第几条记录开始
     * @param end   表示 到第几条记录结束
     * @return      表示 start到end之间的记录集合，包含start和end
     */
    public List<Emp> findAllRecord(int start,int end) throws Exception;
}

package loaderman.entity;

import java.util.Date;

/**
 * 员工
 */
public class Emp {
    private Integer empno;//编号
    private String ename;//姓名
    private String job;//工作
    private Integer mgr;//上级编号
    private Date hiredate;//入职时间
    private Integer sal;//月薪
    private Integer comm;//佣金
    private Integer deptno;//部门编号
    public Emp(){}
    public Integer getEmpno() {
        return empno;
    }
    public void setEmpno(Integer empno) {
        this.empno = empno;
    }
    public String getEname() {
        return ename;
    }
    public void setEname(String ename) {
        this.ename = ename;
    }
    public String getJob() {
        return job;
    }
    public void setJob(String job) {
        this.job = job;
    }
    public Integer getMgr() {
        return mgr;
    }
    public void setMgr(Integer mgr) {
        this.mgr = mgr;
    }
    public Date getHiredate() {
        return hiredate;
    }
    public void setHiredate(Date hiredate) {
        this.hiredate = hiredate;
    }
    public Integer getSal() {
        return sal;
    }
    public void setSal(Integer sal) {
        this.sal = sal;
    }
    public Integer getComm() {
        return comm;
    }
    public void setComm(Integer comm) {
        this.comm = comm;
    }
    public Integer getDeptno() {
        return deptno;
    }
    public void setDeptno(Integer deptno) {
        this.deptno = deptno;
    }
    @Override
    public String toString() {
        return this.empno+":"+this.ename+":"+this.sal+":"+this.hiredate+":"+this.deptno;
    }
}

package loaderman.entity;

import java.util.ArrayList;
import java.util.List;

/**
 * 分页类
 * @author AdminTC
 */
public class Page {
    private Integer currPageNO;//当前页号OK
    private Integer perPageSize = 9;//每页显示记录数，默认为3条记录OK
    private Integer allRecordNO;//总记录数OK
    private Integer allPageNO;//总页号OK
    private List<Emp> empList = new ArrayList<Emp>();//该本页显示的内容OK
    public Page(){}
    public Integer getCurrPageNO() {
        return currPageNO;
    }
    public void setCurrPageNO(Integer currPageNO) {
        this.currPageNO = currPageNO;
    }
    public Integer getPerPageSize() {
        return perPageSize;
    }
    public void setPerPageSize(Integer perPageSize) {
        this.perPageSize = perPageSize;
    }
    public Integer getAllRecordNO() {
        return allRecordNO;
    }
    public void setAllRecordNO(Integer allRecordNO) {
        this.allRecordNO = allRecordNO;
    }
    public Integer getAllPageNO() {
        return allPageNO;
    }
    public void setAllPageNO(Integer allPageNO) {
        this.allPageNO = allPageNO;
    }
    public List<Emp> getEmpList() {
        return empList;
    }
    public void setEmpList(List<Emp> empList) {
        this.empList = empList;
    }
}

package loaderman.service.impl;

import loaderman.dao.impl.EmpDao;
import loaderman.dao.inter.IEmpDao;
import loaderman.entity.Emp;
import loaderman.entity.Page;
import loaderman.service.inter.IEmpService;

import java.util.List;


/**
 * 员工管理模块
 * 业务层实现
 */
public class EmpService implements IEmpService{
    private IEmpDao iEmpDao = new EmpDao();
    public Page show(int currPageNO) throws Exception {
        Page page = new Page();

        //封装当前页号
        page.setCurrPageNO(currPageNO);

        //封装总记录数
        Integer allRecordNO = iEmpDao.getAllRecord();
        page.setAllRecordNO(allRecordNO);

        //封装总页数
        Integer allPageNO = null;
        if(page.getAllRecordNO() % page.getPerPageSize() == 0){
            allPageNO = page.getAllRecordNO() / page.getPerPageSize();
        }else{
            allPageNO = page.getAllRecordNO() / page.getPerPageSize() + 1;
        }
        page.setAllPageNO(allPageNO);

        //封装该本显示的内容
        Integer start = (page.getCurrPageNO()-1) * page.getPerPageSize();
        Integer end = page.getCurrPageNO() * page.getPerPageSize() + 1;
        List<Emp> empList = iEmpDao.findAllRecord(start,end);
        page.setEmpList(empList);

        return page;
    }







    public static void main(String[] args) throws Exception{
        EmpService service = new EmpService();
        System.out.println("---------------------------------------NO1");
        Page page = service.show(1);
        for(Emp e : page.getEmpList()){
            System.out.println(e);
        }
        System.out.println("---------------------------------------NO2");
        page = service.show(2);
        for(Emp e : page.getEmpList()){
            System.out.println(e);
        }
        System.out.println("---------------------------------------NO3");
        page = service.show(3);
        for(Emp e : page.getEmpList()){
            System.out.println(e);
        }
        System.out.println("---------------------------------------NO4");
        page = service.show(4);
        for(Emp e : page.getEmpList()){
            System.out.println(e);
        }
        System.out.println("---------------------------------------NO5");
        page = service.show(5);
        for(Emp e : page.getEmpList()){
            System.out.println(e);
        }
    }
}

package loaderman.service.inter;


import loaderman.entity.Page;
/**
 * 员工管理模块
 * 业务层接口
 */
public interface IEmpService {
    /**
     * 根据页号获取该页需要显示的内容
     * @param currPageNO 当前页号
     * @return 封装该页需要显示的内容
     */
    public Page show(int currPageNO) throws Exception;
}

package loaderman.util;

import com.mchange.v2.c3p0.ComboPooledDataSource;
/**
 * 工具类
 */
public class JdbcUtil {
    /**
     * 加载src目录下的c3p0-config.xml文件
     */
    private static ComboPooledDataSource dataSource = new ComboPooledDataSource();
    /**
     * 获取数据源
     * @return 数据源
     */
    public static ComboPooledDataSource getDataSource() {
        return dataSource;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
    <default-config>
        <property name="driverClass">oracle.jdbc.driver.OracleDriver</property>
        <property name="jdbcUrl">jdbc:oracle:thin:@127.0.0.1:1521:orcl</property>
        <property name="user">scott</property>
        <property name="password">tiger</property>
        <property name="initialPoolSize">5</property>
        <property name="maxPoolSize">5</property>
        <property name="minPoolSize">1</property>
        <property name="acquireIncrement">2</property>
    </default-config>
</c3p0-config>

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <servlet>
        <servlet-name>EmpServlet</servlet-name>
        <servlet-class>loaderman.action.EmpServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>EmpServlet</servlet-name>
        <url-pattern>/EmpServlet</url-pattern>
    </servlet-mapping>

</web-app>