使用JDBC实现分页查询
2017-03-01 14:51
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在MySQL中使用关键字limit控制查询的起始位置和返回的记录数量来实现分页，limit arg1,arg2.
示例如下：
起始页index.jsp：
<%@page import="java.net.URLDecoder"%>
<%@ page language="java" import="java.util.*"
import="com.home.web.dto.*" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>起始页</title>
</head>
<body>
<a href="FindServlet">查看所有商品信息</a>
</body>
</html>
查询数据的FindServlet：
package com.home.web.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.home.web.dao.book.BookDao;
import com.home.web.dto.Book;
/**
* Servlet implementation class AddServlet
*/
@WebServlet("/FindServlet")
public class FindServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FindServlet() {
super();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int curPage=1;
if(request.getParameter("page")!=null){
curPage=Integer.parseInt(request.getParameter("page"));
}
BookDao dao = new BookDao();
List<Book> list = dao.find(curPage);
request.setAttribute("list", list);
int pages;
int count = dao.findCount();
// 计算页数
if (count % Book.PAGE_SIZE == 0) {
pages = count / Book.PAGE_SIZE;
} else {
pages = count / Book.PAGE_SIZE + 1;
}
// 构建分页条
StringBuffer sb = new StringBuffer();
for (int i = 1; i <= pages; i++) {
if (i == curPage) {
sb.append("【" + i + "】");
} else {
sb.append("<a href='FindServlet?page=" + i + "'>" + i + "</a>");
}
sb.append(" ");
}
request.setAttribute("bar", sb.toString());
request.getRequestDispatcher("result.jsp").forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
展示页面result.jsp：
<%@page import="java.sql.*"%>
<%@ page language="java" import="java.util.*" autoFlush="true"
import="com.home.web.dto.*" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<table align="center" width="450" border="1">
<tr>
<td colspan="5" align="center">
<h2>所有图书信息</h2>
</td>
</tr>
<tr align="center">
<td><b>ID</b></td>
<td><b>图书名称</b></td>
<td><b>价格</b></td>
<td><b>数量</b></td>
<td><b>作者</b></td>
</tr>
<%
List<Book> list = (List<Book>) request.getAttribute("list");
if (list == null || list.size() < 1) {
out.println("没有数据！");
} else {
for (Book book : list) {
%>
<tr align="center">
<td><%=book.getId()%></td>
<td><%=book.getName()%></td>
<td><%=book.getPrice()%></td>
<td><%=book.getBookCount()%></td>
<td><%=book.getAuthor()%></td>
</tr>
<%
}
}
%>
<tr>
<td align="center" colspan="5"><%=request.getAttribute("bar")%>
</td>
</tr>
</table>
</body>
</html>
实体类Book：
package com.home.web.dto;
public class Book {
public static final int PAGE_SIZE = 3;
private int id;
private String name;
private double price;
private int bookCount;
private String author;
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 double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getBookCount() {
return bookCount;
}
public void setBookCount(int bookCount) {
this.bookCount = bookCount;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}
数据库操作类BookDao:
示例如下：
起始页index.jsp：
<%@page import="java.net.URLDecoder"%>
<%@ page language="java" import="java.util.*"
import="com.home.web.dto.*" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>起始页</title>
</head>
<body>
<a href="FindServlet">查看所有商品信息</a>
</body>
</html>
查询数据的FindServlet：
package com.home.web.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.home.web.dao.book.BookDao;
import com.home.web.dto.Book;
/**
* Servlet implementation class AddServlet
*/
@WebServlet("/FindServlet")
public class FindServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FindServlet() {
super();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int curPage=1;
if(request.getParameter("page")!=null){
curPage=Integer.parseInt(request.getParameter("page"));
}
BookDao dao = new BookDao();
List<Book> list = dao.find(curPage);
request.setAttribute("list", list);
int pages;
int count = dao.findCount();
// 计算页数
if (count % Book.PAGE_SIZE == 0) {
pages = count / Book.PAGE_SIZE;
} else {
pages = count / Book.PAGE_SIZE + 1;
}
// 构建分页条
StringBuffer sb = new StringBuffer();
for (int i = 1; i <= pages; i++) {
if (i == curPage) {
sb.append("【" + i + "】");
} else {
sb.append("<a href='FindServlet?page=" + i + "'>" + i + "</a>");
}
sb.append(" ");
}
request.setAttribute("bar", sb.toString());
request.getRequestDispatcher("result.jsp").forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
展示页面result.jsp：
<%@page import="java.sql.*"%>
<%@ page language="java" import="java.util.*" autoFlush="true"
import="com.home.web.dto.*" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<table align="center" width="450" border="1">
<tr>
<td colspan="5" align="center">
<h2>所有图书信息</h2>
</td>
</tr>
<tr align="center">
<td><b>ID</b></td>
<td><b>图书名称</b></td>
<td><b>价格</b></td>
<td><b>数量</b></td>
<td><b>作者</b></td>
</tr>
<%
List<Book> list = (List<Book>) request.getAttribute("list");
if (list == null || list.size() < 1) {
out.println("没有数据！");
} else {
for (Book book : list) {
%>
<tr align="center">
<td><%=book.getId()%></td>
<td><%=book.getName()%></td>
<td><%=book.getPrice()%></td>
<td><%=book.getBookCount()%></td>
<td><%=book.getAuthor()%></td>
</tr>
<%
}
}
%>
<tr>
<td align="center" colspan="5"><%=request.getAttribute("bar")%>
</td>
</tr>
</table>
</body>
</html>
实体类Book：
package com.home.web.dto;
public class Book {
public static final int PAGE_SIZE = 3;
private int id;
private String name;
private double price;
private int bookCount;
private String author;
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 double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getBookCount() {
return bookCount;
}
public void setBookCount(int bookCount) {
this.bookCount = bookCount;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}
数据库操作类BookDao:
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