不多说，直接贴代码
show.jsp（显示页面）
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="analysis.JDBCUtils"%>
<%@page import="java.sql.Connection"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP ‘show.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="servlet/DatabaseSearch" method="post">
<td> 输入搜索词 <input type="text" name="keyWord"></td>
<td><input type="submit" value="so easy" ></td>
</form>
<hr>
<form action="servlet/DatabaseProcess" method="post">
功能列表 : <a href="servlet/DatabaseProcess?choose=1&subchoose1=0">默认排序</a>
<a href="servlet/DatabaseProcess?choose=1&subchoose1=1">按价格降序排序</a>
<a href="servlet/DatabaseProcess?choose=1&subchoose1=2">按价格升序排序</a>
价格区间<input style="width:45px" type="text" name="minprice">-<input style="width:45px" type="text" name="maxprice">
<input type="submit" value="Go" >
</form>
<hr><br>
<!-- <tr><td>商品名称</td><td>价格</td><td>超链接</td></tr> -->
<%
String temp = null;
String keyWord = (String) request.getSession().getAttribute("keyword");
//haven‘t input keyword
if(keyWord == null || keyWord.equals("")){
%><h2><font color="red">no keyword input</font></h2><%
return;
}
//the lack of the select sentence is for the easy use of the follow sql query
String sql = " from goods where name like ‘%"+keyWord+"%‘";
//determin where is price in
String sqlBetween = "";
String minprice = (String)request.getSession().getAttribute("minprice");
String maxprice = (String)request.getSession().getAttribute("maxprice");
if(minprice!=null&&maxprice!=null){
sqlBetween = " and price>="+minprice+" and price<="+maxprice+" ";
}
//determine which orderby to choose
String sqlOrderBy = "";
if((temp=(String)request.getSession().getAttribute("orderby"))!=null&&!temp.equals("0")){
if(temp.equals("1")){
sqlOrderBy = " order by price desc";
}
else if(temp.equals("2")){
sqlOrderBy = " order by price asc";
}
}
//get the pagesize
int myPageSize = 5;//default
if(request.getSession().getAttribute("mypagesize")!=null){
myPageSize = (Integer)request.getSession().getAttribute("mypagesize");
//System.out.println("myPageSize:"+myPageSize);
}
//determine which page to show
String sqlLimit = "";
String t = null;
if((t=(String)request.getAttribute("page"))==null){
sqlLimit = " limit "+myPageSize+" offset 0";
}
else{
sqlLimit = " limit "+myPageSize+" offset " +(Integer.parseInt(t)-1)*5;
}
Connection conn = JDBCUtils.getConnection();
System.out.println("select * "+sql+sqlBetween+sqlOrderBy+sqlLimit);//for debug
PreparedStatement ps = conn.prepareStatement("select * "+sql+sqlBetween+sqlOrderBy+sqlLimit);
ResultSet rs = ps.executeQuery();
while(rs.next()){
%>
商品名称 <font color="red"><u><%=rs.getString("name") %></u></font><br>
价格 <font color="green"> <b><%=rs.getInt("price") %></b></font><br>
超链接 <a target="_blank" href="<%=rs.getString("url") %>"><%=rs.getString("url") %></a><br><br>
<%} %>
<%
int sum = 0;//record the sum of the records
ps = conn.prepareStatement("select count(*) as sum "+sql+sqlBetween);
rs = ps.executeQuery();
if(rs.next()){
sum = Integer.parseInt(rs.getString("sum"));
}
// no suitable records
if(sum==0){
%><h2><font color="red">no suitable records</font></h2><%
return ;
}
%>
<hr>
<form action="servlet/Temp" method="get" name="form1">
<select name="rn" onchange="form1.submit()">
<option value="0">请选择每页显示的记录数</option>
<option value="5">每页显示5条</option>
<option value="10">每页显示10条</option>
<option value="20">每页显示20条</option>
</select>
totally <font color="red"><%=sum %></font> records . goto page
<%
//show five records per page
for(int i=1;i<Math.ceil(sum)/myPageSize+1;i++)
{
//high light show the current page
if(t!=null&&i==Integer.parseInt(t)){
%>
<a style="color:red" href="servlet/DatabaseProcess?choose=2&subchoose2=<%=i%>"><%=i%></a>
<%
continue;
}
%>
<a href="servlet/DatabaseProcess?choose=2&subchoose2=<%=i%>"><%=i%></a>
<%} %>
</form>
</body>
</html>
DatabaseProcess.java(只是简单的设置下属性)
package view;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class DatabaseProcess extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 5826464111080351766L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doProcess(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doProcess(request, response);
}
public void doProcess(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String choose = request.getParameter("choose");
//System.out.println("choose=["+choose+"]");
if(choose!=null){
if(choose.equals("1")){
String subchoose1 = request.getParameter("subchoose1");
request.getSession().setAttribute("orderby", subchoose1);
//System.out.println("subchoose1=["+subchoose+"]");
}
else if(choose.equals("2")){
String subchoose2 = request.getParameter("subchoose2");
//System.out.println("subchoose2=["+subchoose2+"]");
request.setAttribute("page", subchoose2);//需要从第一页开始输出，所以不能用session
}
}
String minprice = request.getParameter("minprice");
String maxprice = request.getParameter("maxprice");
if(minprice!=null&&maxprice!=null&&minprice!=""&&maxprice!=""){
//System.out.println(minprice+"-"+maxprice);
if(Integer.parseInt(minprice)>=Integer.parseInt(maxprice))
System.out.println("the minprice and the maxprice input error");
else{
request.getSession().setAttribute("minprice",minprice);//价格区间是持续存在的
request.getSession().setAttribute("maxprice",maxprice);
}
}
getServletContext().getRequestDispatcher("/show.jsp").forward(request, response);
}
}
DatabaseSearch.java(只是简单的设置下属性)
package view;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class DatabaseSearch extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 4110448813797919251L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doQuery(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doQuery(request,response);
}
public void doQuery(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setCharacterEncoding("gbk");
String keyWord = new String(request.getParameter("keyWord").getBytes("ISO-8859-1"),"UTF-8");
//System.out.println("keyword=["+keyWord+"]");
request.getSession().setAttribute("keyword", keyWord);
//清除以往的price区间
if(request.getSession().getAttribute("minprice")!=null){
request.getSession().setAttribute("minprice",null);
}
if(request.getSession().getAttribute("maxprice")!=null){
request.getSession().setAttribute("maxprice",null);
}
//清除以往的排序定义
if(request.getSession().getAttribute("orderby")!=null){
request.getSession().setAttribute("orderby",null);
}
getServletContext().getRequestDispatcher("/show.jsp").forward(request, response);
//response.sendRedirect("../show.jsp");//该方法无法传递attribute
}
}