Servlet之分页
1、创建表和要添加的数据，直接在数据库运行
CREATE DATABASE `bookstore`；
USE `bookstore`;
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
`id` varchar(200) NOT NULL,
`name` varchar(100) NOT NULL,
`price` double DEFAULT NULL,
`pnum` int(11) DEFAULT NULL,
`category` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
insert into `books`(`id`,`name`,`price`,`pnum`,`category`) values ('1001','java编程思想',98,100,'计算机'),('1002','西游记',10,20,'文学'),('1003','九阴真经',20,30,'武侠'),('1004','365夜睡前好故事',19.8,50,'少儿'),('1005','撒哈拉的故事',16.6,80,'文学'),('1006','三只小猪',9.8,50,'少儿'),('1007','中华上下五千年',28,100,'少儿'),('1008','金瓶梅',9.8,50,'文学'),('1009','平凡的世界',55,80,'文学'),('1010','心灵鸡汤',15,100,'文学');
2、分页的javabean的设置
package com.itheima.util;
import java.util.List;
/**
*
* 页面传过来
* currentPage 当前页
* 自己钉死的
*pageSize 页面的尺寸
*计算出来
*totalPage 总页数 pagesize totalRecodes 总记录数
*
*pageindex pagesize currentPage
*
*数据库查出来
*totalRecodes 总记录数
*页面要展示的内容
* list
*
*/
public class PageModel {
private int currentPage;
private int totalPage;
private int pageindex;
private int totalRecodes;
private int pageSize;
private List list;
public PageModel(int currentPage, int totalRecodes, int pageSize) {
super();
this.currentPage = currentPage;
this.totalRecodes = totalRecodes;
this.pageSize = pageSize;
pageindex =(currentPage-1)*pageSize;
totalPage=totalRecodes%pageSize==0?(totalRecodes/pageSize):(totalRecodes/pageSize)+1;
}
/**
* @return the currentPage
*/
public int getCurrentPage() {
return currentPage;
}
/**
* @param currentPage the currentPage to set
*/
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
/**
* @return the totalPage
*/
public int getTotalPage() {
return totalPage;
}
/**
* @param totalPage the totalPage to set
*/
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
/**
* @return the pageindex
*/
public int getPageindex() {
return pageindex;
}
/**
* @param pageindex the pageindex to set
*/
public void setPageindex(int pageindex) {
this.pageindex = pageindex;
}
/**
* @return the totalRecodes
*/
public int getTotalRecodes() {
return totalRecodes;
}
/**
* @param totalRecodes the totalRecodes to set
*/
public void setTotalRecodes(int totalRecodes) {
this.totalRecodes = totalRecodes;
}
/**
* @return the pageSize
*/
public int getPageSize() {
return pageSize;
}
/**
* @param pageSize the pageSize to set
*/
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
/**
* @return the list
*/
public List getList() {
return list;
}
/**
* @param list the list to set
*/
public void setList(List list) {
this.list = list;
}
}
3、与数据库的books表所对应的实体类设置
package com.itheima.domain;
public class Books {
/**
* `id` varchar(200) NOT NULL,
`name` varchar(100) NOT NULL,
`price` double DEFAULT NULL,
`pnum` int(11) DEFAULT NULL,
`category` varchar(50) DEFAULT NULL,
*/
private String id;
private String name;
private double price;
private int pnum;
private String category;
/**
* @return the id
*/
public String getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(String id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the price
*/
public double getPrice() {
return price;
}
/**
* @param price the price to set
*/
public void setPrice(double price) {
this.price = price;
}
/**
* @return the pnum
*/
public int getPnum() {
return pnum;
}
/**
* @param pnum the pnum to set
*/
public void setPnum(int pnum) {
this.pnum = pnum;
}
/**
* @return the category
*/
public String getCategory() {
return category;
}
/**
* @param category the category to set
*/
public void setCategory(String category) {
this.category = category;
}
}
4、页面的设置
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%--导入css --%>
|
5servlet的代码
package com.itheima.web.servlet;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.itheima.service.BookServiceImpl;
import com.itheima.util.PageModel;
/**
* Servlet implementation class PageServlet
*/
public class PageServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int currentPage = Integer.parseInt(request.getParameter("currentPage"));
int pageSize =3;
BookServiceImpl bookServiceImpl = new BookServiceImpl();
PageModel pb=null;
try {
pb = bookServiceImpl.findPageModel(currentPage,pageSize);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
request.setAttribute("pb", pb);
request.getRequestDispatcher("/product_list.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
6service的代码
package com.itheima.service;
import java.sql.SQLException;
import java.util.List;
import com.itheima.dao.BookDaoImpl;
import com.itheima.domain.Books;
import com.itheima.util.PageModel;
public class BookServiceImpl {
/**
*1查总记录数
*new 实体类把currentPage、pageSize totalRecodes
*索引 list 存到PageModel
* @throws SQLException
*
*/
BookDaoImpl bookDaoImpl = new BookDaoImpl();
public PageModel findPageModel(int currentPage, int pageSize) throws SQLException {
int count =bookDaoImpl.findPageRecodes();
PageModel pageModel = new PageModel(currentPage,count,pageSize);
//获取list
List
pageModel.setList(list);
return pageModel;
}
public void delBooksById(String id) throws SQLException {
bookDaoImpl.delBooksById(id);
}
}
7dao层的代码
package com.itheima.dao;
import java.sql.SQLException;
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 com.itheima.domain.Books;
import com.itheima.util.C3P0Util;
public class BookDaoImpl {
public int findPageRecodes() throws SQLException {
QueryRunner qr = new QueryRunner(C3P0Util.getDataSource());
String sql="select count(*) from books";
Long count =(Long)qr.query(sql, new ScalarHandler());
return count.intValue();
}
public List
QueryRunner qr = new QueryRunner(C3P0Util.getDataSource());
String sql="select * from books limit ?,?";
Object[] obj ={pageindex,pageSize};
List
return list;
}
}