java web 分页技术
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查询界面，通过姓名和车号进行查询，然后将查询结果提交给servlet：
<%@ page language="java" 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 background="images/bottom.png"> <br><br><br><br><br> <form action="<%=request.getContextPath()%>/SessionServrlet" method="get"> <table boder="1" align="center"> <tr> <td align="right"><span style="color:white">姓名：</span></td> <td><input type="text" name="name" size="30" /></td> </tr> <tr> <td align="right"><span style="color:white">车号：</span></td> <td><input type="text" name="carNum" size="30" /></td> </tr> <tr> <td><input type="hidden" name="URL" value="beginQueryDynamicMonitor.jsp"></td> </tr> <tr align="right"> <td colspan="2"> <input type="submit" name="submit" value="查询"> <input type="reset" name="reset" value="重置"> </td> </tr> </table> </form> </body> </html>
在servlet将从页面获取到的姓名和车号存到session中（因为request有效期只是一次请求的全过程，翻页的时候就会失效，所以要将其存到session中）
package shouqisystem.user; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * Servlet implementation class ServiceServlet */ public class ServiceServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public ServiceServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String name=new String(request.getParameter("name").getBytes("iso-8859-1"),"utf-8"); String carNum=new String(request.getParameter("carNum").getBytes("iso-8859-1"),"utf-8"); String s1="beginQueryService.jsp"; HttpSession session = request.getSession(); session.setAttribute("name", name); session.setAttribute("carNum", carNum); response.setContentType("text/html;charset=UTF-8"); String s = response.encodeURL(s1); RequestDispatcher disp=null; disp=request.getRequestDispatcher(s); disp.forward(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
Pages.java控制分页
package shouqisystem.user; import java.sql.ResultSet; import javax.servlet.http.HttpServletRequest; public class Pages { ResultSet CountTopicrs=null;//记录总数结果集 ResultSet Pagirs=null;//查询结果集 public int intCountTopic=0;//记录总数 public int intPageSize;//每页显示几条记录 public int intPageCount;//总页数 public int intPage=1;//当前页数 public String nowPage; public String HttpFile; UserInfo db; public Pages(){ intPageSize=2; db=new UserInfo(); } public void querySql(ResultSet CountTopicrs,ResultSet Pagirs,HttpServletRequest request)throws Exception{ HttpFile=request.getRequestURI(); nowPage=request.getParameter("pages"); if(nowPage==null){ intPage=1; }else{ intPage=Integer.parseInt(nowPage); if(intPage<1) intPage=1; } //CountTopicrs=db.queryICcardDataSum(name, carNum); if(CountTopicrs.next()){ intCountTopic=CountTopicrs.getInt(1); } intPageCount=(intCountTopic+intPageSize-1)/intPageSize; if(intPage>intPageCount){ intPage=intPageCount; } CountTopicrs.close(); //db.close_all(); //Pagirs=db.queryICcardData(name, carNum); //return Pagirs; } public int getCountTopic(){ return intCountTopic; } public int getPageCount(){ return intPageCount; } public int getIntPage(){ return intPage; } public String PageFooter(){ String str=""; int next,prev; prev=intPage-1; next=intPage+1; System.out.println(); str+="<font color=red>查询到"+getCountTopic()+"条记录</font>"+" <font color=red> 共"+getPageCount()+"页</font>"; str+="<font color=red>第"+getIntPage()+"页</font>"; if(intPage>1) str+="<font color=red><a href=" + HttpFile + "?pages=1"+">首页</a></font>"; else str+="<font color=red>首页"; if(intPage>1) str +="<font color=red><a href=" + HttpFile + "?pages="+prev+">上一页</a></font>"; else str +="<font color=red>上一页</font>"; if(intPage<intPageCount) str +="<font color=red><a href=" + HttpFile + "?pages="+next+">下一页</a></font>"; else str +="<font color=red>下一页</font>"; if(intPageCount>1&&intPage !=intPageCount) str +="<font color=red><a href=" + HttpFile + "?pages="+intPageCount+">尾页</a></font>"; else str +="<font color=red>尾页</font>"; return str; } public void close_all()throws Exception{ db.close_all(); } }
查询结果页面：
<%@page import="java.sql.ResultSet"%> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ page import="java.io.*,java.util.*,java.sql.*,shouqisystem.user.*" %> <jsp:useBean id="userinfo" scope="request" class="shouqisystem.user.UserInfo"/> <jsp:useBean id="pages" scope="page" class="shouqisystem.user.Pages"/> <!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 background="images/bottom.png"> <center> <form action="" method="GET" name="form"> <table boder="2" cellpadding="5" cellspacing="5"> <tr> <td><b><span style="color:white">选择</span></b></td> <td><b><span style="color:white">姓名</span></b></td> <td><b><span style="color:white">车牌号</span></b></td> <td><b><span style="color:white">超速日期</span></b></td> <td><b><span style="color:white">超速四级次数</span></b></td> <td><b><span style="color:white">出外埠日期</span></b></td> <td><b><span style="color:white">去向</span></b></td> <td><b><span style="color:white">疲劳驾驶日期</span></b></td> <td><b><span style="color:white">级别</span></b></td> <td><b><span style="color:white">次数</span></b></td> </tr> <% String name=(String)session.getAttribute("name"); String carNum=(String)session.getAttribute("carNum"); ResultSet CountTopicrs=userinfo.queryDynamicMonitorSum(name, carNum); ResultSet rs=userinfo.queryDynamicMonitor(name, carNum); pages.querySql(CountTopicrs,rs,request); String footer=pages.PageFooter(); if(pages.intPageCount>0){ int i=0; while(rs.next()) { i++; if(i>((pages.intPage-1)*pages.intPageSize)&&(i<=pages.intPage*pages.intPageSize)) { %> <tr> <td><input type="checkbox" name="pkey" size="5" value="<%=String.valueOf(rs.getInt("ID")) %>"/></td> <td><span style="color:white"><%=rs.getString("name") %></span></td> <td><span style="color:white"><%=rs.getString("carNum") %></span></td> <td><span style="color:white"><%=rs.getString("speedTime") %></span></td> <td><span style="color:white"><%=rs.getString("speedFourLevelTimes") %></span></td> <td><span style="color:white"><%=rs.getString("outGoingTime") %></span></td> <td><span style="color:white"><%=rs.getString("destination") %></span></td> <td><span style="color:white"><%=rs.getString("fatigueDrivingTime") %></span></td> <td><span style="color:white"><%=rs.getString("degree") %></span></td> <td><span style="color:white"><%=rs.getString("times") %></span></td> </tr> <% } } } out.println("<tr><td colspan=2>"+footer+"</td></tr>"); rs.close(); pages.close_all(); %> <tr align="right"> <td colspan="2"> <input type="submit" name="revise" value="修改" onclick="form.action=‘reviseDynamicMonitor.jsp‘;form.submit();"> <input type="submit" name="delete" value="删除" onclick="form.action=‘deleteDynamicMonitor.jsp‘;form.submit();"> </td> </tr> </table><br><br> </form> </center> </body> </html>
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