public Product() {
// TODO Auto-generated constructor stub
}
public Product(String pid, String pname, double market_price, double shop_price, String pimage, Date pdate,
String is_hot, String pdesc, int pflag, String cid) {
super();
this.pid = pid;
this.pname = pname;
this.market_price = market_price;
this.shop_price = shop_price;
this.pimage = pimage;
this.pdate = pdate;
this.is_hot = is_hot;
this.pdesc = pdesc;
this.pflag = pflag;
this.cid = cid;
}
@Override
public String toString() {
return “Product [pid=” + pid + “, pname=” + pname + “, market_price=” + market_price + “, shop_price=”
-
shop_price + “, pimage=” + pimage + “, pdate=” + pdate + “, is_hot=” + is_hot + “, pdesc=” + pdesc
-
“, pflag=” + pflag + “, cid=” + cid + “]”;
}
}
c3p0链接数据库
com.mysql.jdbc.Driver
jdbc:mysql://localhost:3306/store_07
root
root
30000
30
10
30
100
10
200
10
1
0
com.mysql.jdbc.Driver
jdbc:mysql://localhost:3306/store_07
root
root
5
20
10
40
0
5
/**
- Servlet implementation class ProductServlet
*/
public class ProductServlet extends HttpServlet {
/**
- @see HttpServlet#HttpServlet()
*/
public ProductServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
- @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
/**
- @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//接收当前页
String num=request.getParameter(“num”);
int curNum=Integer.parseInt(num);
System.out.println(curNum);
ProductService ProductService=new ProductService();
//调用业务层查询当前页功能,返回PageModel对象(1_当前页数据2_分页参数)
PageModel pm=null;
try {
pm = ProductService.findProducts(curNum);
} catch (Exception e) {
e.printStackTrace();
}
//将PageModel对象放入request
request.setAttribute(“page”, pm);
//request.getRequestDispatcher(“/product_list.jsp”).forward(request, response);
request.getRequestDispatcher(“/product_list2.jsp”).forward(request, response);
}
}
public class ProductService {
public PageModel findProducts(int curNum) throws SQLException{
//1_创建PageModel对象 目的:计算分页参数
ProductDao ProductDao=new ProductDao();
int totalRecords=ProductDao.findToralRecords();
PageModel pm=new PageModel(curNum,5,totalRecords);//传入要点击的页数，和每页的页数，和对应总信息的条数
//2_关联数据 select * from product limit ? , ?
List list=ProductDao.findProducts(pm.getStartIndex(),pm.getPageSize());
pm.setList(list);
//3_关联url
pm.setUrl(“ProductServlet”);
return pm;
}
}
public class ProductDao {
//统计表中有多少条数据
public int findToralRecords() throws SQLException {
QueryRunner qr = new QueryRunner(JDBCUtils.getDataSource());
Long num=(Long)qr.query(“select count(*) from product”,new ScalarHandler());
return num.intValue();
}
public List findProducts(int startIndex, int pageSize) throws SQLException {
String sql="select * from product limit ? ,? ";
QueryRunner qr = new QueryRunner(JDBCUtils.getDataSource());
return qr.query(sql, new BeanListHandler(Product.class),startIndex,pageSize);
}
}
product_list.jsp
<%@ page language=“java” contentType=“text/html; charset=utf-8” pageEncoding=“utf-8”%>
<%@ taglib prefix=“c” uri=“http://java.sun.com/jsp/jstl/core” %>
<c:if test=“${empty page.list }”>
暂无数据</c:if>
<c:if test=“${not empty page.list }”>
<c:forEach items=“${page.list}” var=“p”>
${p.pname} ${p.market_price} ${p.shop_price}
</c:forEach>
</c:if>
<%–分页显示的开始 --%>
共 p a g e . t o t a l P a g e N u m 页 / 第 {page.totalPageNum}页/第 page.totalPageNum页/第{page.currentPageNum}页
<c:if test=“${page.currentPageNum != 1}”>
</c:if>
<%-- 获取开始结束页码
${page} *.getAttribute(“page”); 获取到pageModel对象
${page.startPage} 调用PageModel对象getStartPage()方法
–%>
<c:forEach begin=“ p a g e . s t a r t P a g e " e n d = " {page.startPage}" end=" page.startPage"end="{page.endPage}” var=“pagenum”>
<c:if test=“${page.currentPageNum==pagenum}”>
${pagenum}
</c:if>
<c:if test=“${page.currentPageNum!=pagenum}”>
</c:if>
</c:forEach>
<c:if test=“${page.currentPageNum != page.totalPageNum}”>
</c:if>
<%–分页显示的结束–%>
product\_list2.jsp文末
逆水行舟不进则退，所以大家要有危机意识。
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