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Thu, 21 Feb 2008 09:27:00 GMT

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import com.mdcl.mocha.fe.developer.template.util.TemplateUtil;

public class ParamUtil {

/**
* 把request取到的参数放��C��个Map�?br /> * @param request
* @return
*/
public static Map parseRequest(HttpServletRequest request){
 Map map = new HashMap();
 String key = null;
 String value = null;
 for(Enumeration enumeration = request.getParameterNames(); enumeration.hasMoreElements(); map.put(key, value))
 {
 key = (String)enumeration.nextElement();
 String as[] = request.getParameterValues(key);
 value = as[0];
 for(int i = 1; i < as.length; i++)
 value = value + "," +as[i];

}
return map;
}
}

李云�?/a> 2008-02-21 17:27 发表评论

java判断操作�pȝ��

Fri, 01 Feb 2008 02:13:00 GMT

import java.net.URL;

public class OS {
public static final String CLASS_PATH;
public static final boolean isLinux;
static {
  URL resource = OS.class.getResource("OS.class");
  String classPath = resource.getPath();
  String className = OS.class.getName().replace('.', '/') + ".class";
  String classesPath = classPath.substring(0, classPath.indexOf(className));

  if (System.getProperty("os.name").toUpperCase().indexOf("WINDOWS") != -1&& classesPath.startsWith("/")) {
   classesPath = classesPath.substring(1);
   isLinux = false;
  } else {
   isLinux = true;
  }
  CLASS_PATH = classesPath;
}

public static void main(String arg[]){

  System.out.println(OS.isLinux);
}
}

李云�?/a> 2008-02-01 10:13 发表评论

jsp查看session信息

Wed, 05 Dec 2007 02:29:00 GMT

<%@ page language="java" contentType="text/html; charset=GBK"
import="java.util.*" pageEncoding="GBK"%>

Insert title here

<%
out.print("
"+"session is new:"+session.isNew());

Date created = new Date(session.getCreationTime());
//得到session对象创徏的时�?br />Date accessed = new Date(session.getLastAccessedTime());
//得到最后访问该session对象的时�?br />out.println("
"+"ID " + session.getId()+" ");
//得到该session的id�Q��ƈ打印
out.println("
"+"Created: " + created+" ");
//打印session创徏旉��
out.println("
"+"Last Accessed: " + accessed+" ");
//打印最后访问时�?/p>

session.setAttribute("Name","Tom");
//在session中添加变量Name=Tom
session.setAttribute("UID","12345678");
//在session中添加变量UID=12345678

Enumeration e = session.getAttributeNames();
//得到session中变量名的枚丑֯��?br />while (e.hasMoreElements()) { //遍历每一个变�?br />String name = (String)e.nextElement(); //首先得到名字
String value = session.getAttribute(name).toString();
//由名字从session中得到�?br />out.println("
"+name + " = " + value+" "); //打印
}

李云�?/a> 2007-12-05 10:29 发表评论

Tue, 04 Dec 2007 01:57:00 GMT

实现方式�Q�jsp+javabean
版本 �Q�jfreechart-1.0.8
web-inf�Q�设�|?br />=====================================

 DisplayChart

 org.jfree.chart.servlet.DisplayChart


 DisplayChart
 /servlet/DisplayChart

======================================
jsp文�g�Q?br />=========================================================================
<%@ page language="java" contentType="text/html; charset=GBK"
pageEncoding="GBK"%>

Insert title here

class="com.mdcl.fso.homepage.chart.BarChart01" />

<%
String fileName = barchart01.drawPic(request.getSession(), out);
String graphURL = request.getContextPath()
+ "/servlet/DisplayChart?filename=" + fileName;
%>

" border="0" usemap="#<%=fileName %>" />

style="position:absolute; font-family:'宋体'; font-size: 12px;line-height: 20px;background-color:#FFFFEC; border: 1px solid #999999;display:none;left:0px;top:1px;">��试昄��

=========================================================================
java文�g
=========================================================================
package com.mdcl.fso.homepage.chart;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.urls.StandardCategoryURLGenerator;
import org.jfree.chart.urls.StandardPieURLGenerator;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.labels.*;
import org.jfree.ui.*;
import java.util.*;

import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspWriter;

import com.mdcl.fso.homepage.*;

public class BarChart01 {

private static DefaultCategoryDataset dataset = new DefaultCategoryDataset();

private DefaultCategoryDataset getDataset() {// 取数�?/p>

  List expense = new ArrayList();
  String sql = "select ftr.organ_id ,fs.dept_name,ftr.subject_id,fft.finance_type_name,ftr.rpt_date ,ftr.rpt_data "
    + "from fso_t_rpt_expense ftr,fso_sdept fs,fso_finance_type fft "
    + "where ftr.type_id='D' "
    + "and ftr.organ_id=fs.dept_id "
    + "and ftr.rpt_date='2007-08' "
    + "and fft.finance_type_id=ftr.subject_id "
    + "and ftr.organ_id='1140'";

expense = DBDao.DbQueryExpense(sql);
 for (int i = 0; i < expense.size(); i++) {
 HashMap param = new HashMap();
 param = (HashMap) expense.get(i);

   double dt = Double.parseDouble(String.valueOf(param.get("rpt_data")));
   String a = (String) param.get("organ");
   String b = (String) param.get("subject");

dataset.addValue(dt, a, b);
}

return dataset;

}

public String drawPic(HttpSession session, JspWriter out) {
  String fileName = null;
  JFreeChart chart = ChartFactory.createBarChart3D("2007-08成本�l�计", "费用�c�d��",
    "金额�Q�单位：元）", getDataset(), PlotOrientation.VERTICAL, true, true,
    true);
  chart.setBackgroundPaint(Color.WHITE);

CategoryPlot plot = chart.getCategoryPlot();// 获取�l�图�?/p>

plot.setBackgroundPaint(new Color(255, 255, 255)); // 讄��l�图��景色

plot.setRangeGridlinePaint(Color.gray); // 讄��水��^方向背景�U�K��?/p>

plot.setRangeGridlinesVisible(true); // 讄��是否昄��水��^方向背景�U?默认��gؓTrue

plot.setDomainGridlinePaint(Color.black); // 讄��垂直方向背景�U�K��?/p>

// plot.setDomainGridlinesVisible(true); // 讄��是否昄��垂直方向背景�U?默认��gؓFalse

CategoryAxis domainAxis = plot.getDomainAxis();// 获取�l�计�U�类轴标题（X��_��

plot.setDomainAxis(domainAxis);// ��d��X�?/p>

BarRenderer3D renderer = new BarRenderer3D();// 获得BarRenderer3D�cȝ��实例�Q�目的是讄��柱�Ş的绘制属�?/p>

renderer.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator());//

renderer.setBaseItemURLGenerator(new StandardCategoryURLGenerator("index2.jsp"));// 生成热点,用于链接

renderer.setItemMargin(0.1);// 讄��每个�l�所包含的��^行柱的之间距��?/p>

renderer.setSeriesPaint(0, Color.GREEN);// 讄��柱子的颜�?br /> renderer.setSeriesPaint(1, Color.blue);// 讄��柱子的颜�?/p>

renderer.setBaseOutlinePaint(Color.BLACK);

renderer.setWallPaint(Color.gray);// 讄�� Wall 的颜�?/p>

renderer.setItemLabelAnchorOffset(10D);// 讄��柱�Ş图上的文字偏��d�?/p>

renderer.setBaseItemLabelFont(new Font("arial", Font.PLAIN, 10), true);// 讄��柱�Ş图上的文�?/p>

renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());// //昄��每个��q��数��|��q�修改该数值的字体属�?/p>

renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER));

renderer.setBaseItemLabelsVisible(true);

renderer.setMaximumBarWidth(0.050000000000000003D);

plot.setRenderer(renderer);

plot.setForegroundAlpha(0.80f);// 讄��q��透明�?/p>

// plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);//讄��昄��位置

plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);// 讄��昄��位置

try {

PrintWriter pw = new PrintWriter(out);

StandardEntityCollection sec = new StandardEntityCollection();
ChartRenderingInfo info = new ChartRenderingInfo(sec);

   fileName = ServletUtilities.saveChartAsPNG(chart, 640, 400, info,
     session);
   // ChartUtilities.writeChartAsPNG(op,chart, 640, 400, info,true,0);
   ChartUtilities.writeImageMap(pw, fileName, info, true);
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

return fileName;

}

}
=========================================================================

李云�?/a> 2007-12-04 09:57 发表评论

JSP验证码生�?

Thu, 20 Sep 2007 11:32:00 GMT

java 代码

<%@ page
import = "java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
<%@ page import = "java.io.OutputStream" %>
<%@ page pageEncoding= "UTF-8" %>
<%!Color getRandColor( int fc, int bc) {
Random random = new Random();
if (fc > 255 )
fc = 255 ;
if (bc > 255 )
bc = 255 ;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}%>
<%
try {
response.setHeader( "Pragma" , "No-cache" );
response.setHeader( "Cache-Control" , "no-cache" );
response.setDateHeader( "Expires" , 0 );
int width = 60 , height = 20 ;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
OutputStream os = response.getOutputStream();
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor( 200 , 250 ));
g.fillRect( 0 , 0 , width, height);
g.setFont( new Font( "Times New Roman" , Font.PLAIN, 18 ));
g.setColor(getRandColor( 160 , 200 ));
for ( int i = 0 ; i < 155 ; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt( 12 );
int yl = random.nextInt( 12 );
g.drawLine(x, y, x + xl, y + yl);
}
String sRand = "" ;
for ( int i = 0 ; i < 4 ; i++) {
String rand = String.valueOf(random.nextInt( 10 ));
sRand += rand;
g.setColor( new Color( 20 + random.nextInt( 110 ), 20 + random
.nextInt( 110 ), 20 + random.nextInt( 110 )));
g.drawString(rand, 13 * i + 6 , 16 );
}
session.setAttribute( "rand" , sRand);
g.dispose();
ImageIO.write(image, "JPEG" , os);
os.flush();
os.close();
os = null ;
response.flushBuffer();
out.clear();
out = pageContext.pushBody();
} catch (IllegalStateException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
%>

李云�?/a> 2007-09-20 19:32 发表评论

Escape/unescape的Java实现

Thu, 20 Sep 2007 10:21:00 GMT

摘要: Escape/unescape的Java实现关键�? Escape/unescape的Java实现 java 代码 ... 阅读全文

李云�?/a> 2007-09-20 18:21 发表评论

Ajax实现二��联动下拉�?

Thu, 20 Sep 2007 02:04:00 GMT

�q�个一个ajax的经典示例，也是ajax的长处所在。不多说了，下面来看代码�?br />
��目�l�构图：

index.jsp:

<%@ page language="java" contentType="text/html; charset=utf-8"%>

<html>
 <head>
 <title>My JSP 'index.jsp' starting pagetitle>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 <SCRIPT type="text/javascript">
 var req;
 window.onload=function(){
 }

 function Change_Select()
 {
 var zhi=document.getElementById('hero').value;
 var url="select?id="+escape(zhi);
 if(window.XMLHttpRequest)
 {
 req=new XMLHttpRequest();
 }else if(window.ActiveXObject)
 {
 req=new ActiveXObject("Microsoft.XMLHTTP");
 }

 if(req)
 {
 req.open("GET",url,true);
 req.onreadystatechange=callback;
 req.send(null);
 }
 }

 function callback()
 {
 if(req.readyState == 4)
 {
 if(req.status == 200)
 {
 parseMessage();
 }else{
 alert("Not able to retrieve description"+req.statusText);
 }
 }
 }

 function parseMessage()
 {
 var xmlDoc=req.responseXML.documentElement;
 var xSel=xmlDoc.getElementsByTagName('select');
 var select_root=document.getElementById('skill');
 select_root.options.length=0;

 for(var i=0;i<xSel.length;i++)
 {
 var xValue=xSel[i].childNodes[0].firstChild.nodeValue;
 var xText=xSel[i].childNodes[1].firstChild.nodeValue;
 var option=new Option(xText,xValue);
 try{
 select_root.add(option);
 }catch(e){
 }
 }


 }
 SCRIPT>
 head>

 <body>
 <div align="center">
 <form name="form1" method="post" action="">
 <TABLE width="70%" boder="0" cellspacing="0">
 <TR>
 <TD align="center">Double Select BoxTD>
 TR>
 <TR>
 <TD>
 <SELECT name="hero" id="hero" onChange="Change_Select()">
 <OPTION value="0">UnboundedOPTION>
 <OPTION value="1">D.K.OPTION>
 <OPTION value="2">NEC.OPTION>
 <OPTION value="3">BOSSOPTION>
 SELECT>
 <SELECT name="skill" id="skill">
 <OPTION value="0">UnboundedOPTION>
 SELECT>
 TD>
 TR>
 <TR><td> td>TR>
 TABLE>
 form>
 div>
 body>
html>

SelectServlet.java:

package com;

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 SelectServlet extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public SelectServlet() {
        super();
    }

    /**
     * Destruction of the servlet.

     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet.

     *
     * This method is called when a form has its tag value method equals to get.
     *
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/xml");
        response.setHeader("Cache-Control","no-cache");

        String targetId=request.getParameter("id").toString();
        String xml_start="";
        String xml_end="";
        String xml="";
        if(targetId.equalsIgnoreCase("0")){
            xml="";
        }else if(targetId.equalsIgnoreCase("1")){
            xml="";
            xml +="";
            xml +="";
            xml +="";
        }else if(targetId.equalsIgnoreCase("2")){
            xml="";
            xml +="";
            xml +="";
            xml +="";
        }else{
            xml="";
            xml +="";
            xml +="";
            xml +="";
        }
        String last_xml=xml_start+xml+xml_end;
        response.getWriter().write(last_xml);
    }

    /**
     * The doPost method of the servlet.

     *
     * This method is called when a form has its tag value method equals to post.
     *
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request,response);
    }

    /**
     * Initialization of the servlet.

     *
     * @throws ServletException if an error occure
     */
    public void init() throws ServletException {
        // Put your code here
    }

}

web.xml:

xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
 xmlns="http://java.sun.com/xml/ns/j2ee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
 http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 <servlet>
 <servlet-name>SelectServletservlet-name>
 <servlet-class>com.SelectServletservlet-class>
 servlet>

 <servlet-mapping>
 <servlet-name>SelectServletservlet-name>
 <url-pattern>/selecturl-pattern>
 servlet-mapping>

 <welcome-file-list>
 <welcome-file>index.jspwelcome-file>
 welcome-file-list>
web-app>

�q�行�l�果图：

李云�?/a> 2007-09-20 10:04 发表评论

java ��d��txt文本文�g(转发)

Wed, 29 Aug 2007 03:01:00 GMT

��d��所有的文�g数据
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*,java.lang.*"%>

��d��所有的文�g数据

<%
String path=request.getRealPath(".");
FileReader fr=new FileReader(path + "file://ReadData.txt/");
//关键在于��d��q�程中，要判断所��d��的字�W�是否已�l�到了文件的末尾�Q��ƈ且这个字�W�是不是文�g中的断行�W�，卛_��断该字符值是否�ؓ13�?br />int c=fr.read();//从文件中��d��一个字�W?br />//判断是否已读到文件结��?br />while(c!=-1){
out.print((char)c);//输出��d��的数�?br /> c=fr.read();//从文件中�l�箋��d��数据
if(c==13){//判断是否为断行字�W?br /> out.print("
");//输出分行标签
fr.skip(1);//略过一个字�W?br /> //c=fr.read();//��d��一个字�W?br /> }
}
fr.close();
%>

一行一行读取数�?br /><%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*"%>

文�g��d��

<%
String path=request.getRealPath("");//取得当前目录的�\�?br /> FileReader fr=new FileReader(path + "file://file//inc//t.txt%22);//建立FileReader对象�Q��ƈ实例化�ؓfr
BufferedReader br=new BufferedReader(fr);//建立BufferedReader对象�Q��ƈ实例化�ؓbr
String Line=br.readLine();//从文件读取一行字�W�串
//判断��d��到的字符串是否不为空
while(Line!=null){
out.println(Line + "
");//输出从文件中��d��的数�?br /> Line=br.readLine();//从文件中�l�箋��d��一行数�?br /> }
br.close();//关闭BufferedReader对象
fr.close();//关闭文�g
%>

略过文�g中的字符不读�?br /><%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*"%>

略过字节不读�?lt;/title> </head> <body> <% String path=request.getRealPath("."); FileReader fr=new FileReader(path + "<a href="file://ReadData.txt/">file://ReadData.txt/</a>"); fr.skip(2);//跌��2个字�?br />int c=fr.read();//��d��一个字�?br />while(c!=-1){ out.print((char)c); c=fr.read(); } fr.close(); %> </body> </html> ��数据写入文�?br /><%@ page contentType="text/html;charset=gb2312"%> <%@ page import="java.io.*"%> <html> <head> <title>��数据写入文�?lt;/title> </head> <body> <% String path=request.getRealPath("."); FileWriter fw=new FileWriter(path + "<a href="file://WriteData.txt%22);//">file://WriteData.txt%22);//</a>建立FileWriter对象�Q��ƈ实例化fw //��字�W�串写入文�g fw.write("大家好！"); fw.write("本书是《JSP�~�程技巧�?); fw.write("请多多指教！"); fw.write("email:stride@sina.com"); fw.close(); FileReader fr=new FileReader(path + "<a href="file://WriteData.txt/">file://WriteData.txt/</a>"); BufferedReader br=new BufferedReader(fr);//建立BufferedReader对象�Q��ƈ实例化�ؓbr String Line=br.readLine(); //��d��一行数�?br />out.println(Line + " "); br.close();//关闭BufferedReader对象 fr.close(); %> </body> </html> ��写入文件的数据分行 <%@ page contentType="text/html;charset=gb2312"%> <%@ page import="java.io.*"%> <html> <head> <title>��写入文件的数据分行

<%
String path=request.getRealPath(".");
FileWriter fw=new FileWriter(path + "file://WriteData.txt/");
BufferedWriter bw=new BufferedWriter(fw);
bw.write("大家好！");
bw.write("本书是《JSP�~�程技巧》�?);
bw.newLine();//断行
bw.write("请多多指教！");
bw.newLine();//断行
bw.write("email: stride@sina.com");
bw.flush();//��数据更新至文�g
fw.close();//关闭文�g��?br />out.println("写入文�g内容为：
");
FileReader fr=new FileReader(path + "file://WriteData.txt/");
BufferedReader br=new BufferedReader(fr);
String Line=br.readLine();//��d��一行数�?br />while(Line!=null){
out.println(Line + "
");
Line=br.readLine();
}
fr.close();
%>

如何��数据追加写入到文�g
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*"%>

��写入文件的数据分行

<%
String path=request.getRealPath(".");
RandomAccessFile rf=new RandomAccessFile(path + "file://WriteData.txt%22,%22rw%22);//定义一个类RandomAccessFile的对象，�q�实例化
rf.seek(rf.length());//��指针移动到文�g末尾
rf.writeBytes("\nAppend a line to the file!");
rf.close();//关闭文�g��?br />out.println("写入文�g内容为：
");
FileReader fr=new FileReader(path + "file://WriteData.txt/");
BufferedReader br=new BufferedReader(fr);//��d��文�g的BufferedRead对象
String Line=br.readLine();
while(Line!=null){
out.println(Line + "
");
Line=br.readLine();
}
fr.close();//关闭文�g
%>

import java.util.*;
import java.io.*;
public class ReadIni
{
public static void main(String[] args)
 throws Exception
{
 Properties proDB = new Properties();
 FileInputStream in = new FileInputStream("DBConfig.ini");
 proDB.load(in);
 String jdbc = proDB.getProperty("jdbc");
 String dburl = proDB.getProperty("dburl");
 String userid = proDB.getProperty("userid");
 String password = proDB.getProperty("password");

    System.out.println(jdbc);
    System.out.println(dburl);
    System.out.println(userid);
    System.out.println(password);
}
}

DBConfig.ini:

dburl=jdbcracle:thin:@202.16.147.104:1521ub
userid=user
password=password
jdbc=oracle.jdbc.driver.OracleDriver

李云�?/a> 2007-08-29 11:01 发表评论

��单的jsp控制分页

Fri, 03 Aug 2007 02:55:00 GMT

<%
//分页昄��
int num = 0;
int countall = infolist.size();//��L��
int pageSize = 28;//每页数量
int pageCount;//��d��|��
int pageNo = 1;//当前��号
int mixNum; //当前��|��据开始号
int maxNum;

String pNO = request.getParameter("pageNo");

if((pNO != null) && (!pNO.equals(""))){

pageNo=Integer.parseInt(pNO);
}

if (countall > pageSize) {
 if ((countall / pageSize) * pageSize < countall) {
 pageCount = (countall / pageSize) + 1;
 }
 else{
 pageCount = (countall / pageSize);
 }
}

else if (countall / pageSize == 1) {
 pageCount = 1;
}
else {
 pageCount = 1;
}

if (pageNo >= pageCount) {
 pageNo = pageCount;
}
else if (pageNo < 1) {
 pageNo = 1;
}


mixNum = (pageNo-1) * pageSize;
maxNum = pageNo*pageSize;

if((mixNum + pageSize) > countall){
 maxNum = countall;
}
else{
 maxNum = mixNum+pageSize;
}
%>
---------------------------------------------------------------------------------------------

<%
for(int i=mixNum;i //此处用list循环下标用i
}
%>

class="word">

src="<%=path%>/images/pagination/list_home.gif" width="13"
 height="13"> <%
 if (pageNo > 1) {
 %> 首页
 <%
 }else{
 %> 首页 <%
 }
 %> /images/pagination/list_pre.gif"
 width="13" height="13"> <%
 if (pageNo > 1) {
 %> 前一��?lt;/a>
 <%
 }else{
 %> 前一��?amp;nbsp; <%
 }
 %> src="<%=path%>/images/pagination/list_next.gif" width="13"
 height="13"> <%
 if (pageCount>pageNo) {
 %> 后一��?lt;/a>
 <%
 }else{
 %> 后一��?amp;nbsp; <%
 }
 %> /images/pagination/list_end.gif"
 width="13" height="13"> <%
 if (pageCount>pageNo) {
 %> ��N�� <%
 }else{
 %> ��N�� <%
 }
 %>

�?lt;%=pageCount%>��?amp;nbsp;�W?lt;%=pageNo%>��?amp;nbsp;
跌��{

name="textfield" type="text" class="input" size="1">

href="javascript:check()"> src="<%=path%>/images/pagination/go.gif" border="0" width="18"
height="18">

李云�?/a> 2007-08-03 10:55 发表评论

JSP分页技术实�?[转脓]

Sat, 28 Jul 2007 04:26:00 GMT

目前比较�q�泛使用的分��|��式是��查询结果缓存在HttpSession或有状态bean中，��页的时候从�~�存中取��Z��|��据显�C�。这�U�方法有两个主要的缺点：一是用户可能看到的是过期数据；二是如果数据量非常大时第一�ơ查询遍历结果集会耗费很长旉��Q��ƈ且缓存的数据也会占用大量内存�Q�效率明显下降�?br />　　其它常见的方法还有每�ơ翻��都查询一�ơ数据库�Q�从ResultSet中只取出一��|��据（使用rs.last();rs.getRow()获得总计录条敎ͼ�使用rs.absolute()定位到本��v始记录）。这�U�方式在某些数据�?如oracle)的JDBC实现中差不多也是需要遍历所有记录，实验证明在记录数很大旉��度非常慢�?br />　　至于�~�存�l�果集ResultSet的方法则完全是一�U�错误的做法。因为ResultSet在Statement或Connection关闭时也会被关闭�Q�如果要使ResultSet有效势必长时间占用数据库�q�接�?

　　因此比较好的分页做法应该是每�ơ翻��늚�时候只从数据库里检索页面大��的块区的数据。这栯��然每�ơ翻��都需要查询数据库�Q�但查询出的记录数很��，�|�络传输数据量不大，如果使用�q�接池更可以略过最耗时的徏立数据库�q�接�q�程。而在数据库端有各�U�成熟的优化技术用于提高查询速度�Q�比在应用服务器层做�~�存有效多了�?/p>

在oracle数据库中查询�l�果的行号��用伪列ROWNUM表示�Q�从1开始）。例如select * from employee where rownum<10 �q�回�?0条记录。但因�ؓrownum是在查询之后排序之前赋值的�Q�所以查询employee按birthday排序的第100�?20条记录应该这么写�Q?br />[pre] select * from (
 select my_table.*, rownum as my_rownum from (
 select name, birthday from employee order by birthday
 ) my_table where rownum <120
 ) where my_rownum>=100
[/pre]
　　mySQL可以使用LIMIT子句�Q?br />　　　　select name, birthday from employee order by birthday LIMIT 99,20
　　DB2有rownumber()函数用于获取当前行数�?br />　　SQL Server没研�I�过�Q�可以参考这��文章：http://www.csdn.net/develop/article/18/18627.shtm

　　在Web�E�序中分��会被频�J��用，但分��늚�实现�l�节却是�~�程�q�程中比较麻烦的事情。大多分��|��C�的查询操作都同旉��要处理复杂的多重查询条�g�Q�sql语句需要动态拼接组成，再加上分��需要的记录定位、总记录条数查询以及查询结果的遍历、封装和昄��Q�程序会变得很复杂�ƈ且难以理解。因此需要一些工��L��化分��代码，使程序员专注于业务逻辑部分。下面是我设计的两个工具�c�：
　　PagedStatement ��装了数据库�q�接、总记录数查询、分��|��询、结果数据封装和关闭数据库连接等操作�Q��ƈ使用了PreparedStatement支持动态设�|�参数�?br />　　RowSetPage 参考PetStore的page by page iterator模式�Q?设计RowSetPage用于��装查询�l�果�Q��用OracleCachedRowSet�~�存查询出的一��|��据，关于使用CachedRowSet��装数据库查询结果请参考JSP��面查询昄��常用模式�Q�以及当前页码、总记录条数、当前记录数�{�信息， �q�且可以生成��单的HTML分页代码�?br />　　PagedStatement 查询的结果封装成RowsetPage�?/p>

　　下面是简单的使用�C�Z��Q?/p>

    //DAO查询数据部分代码�Q?
    �?
    public RowSetPage getEmployee(String gender, int pageNo) throws Exception{
        String sql="select emp_id, emp_code, user_name, real_name from employee where gender =?";
       //使用Oracle数据库的分页查询实现,每页昄��5�?
        PagedStatement pst =new PagedStatementOracleImpl(sql, pageNo, 5);
        pst.setString(1, gender);
        return pst.executeQuery();
    }

//Servlet处理查询��h��部分代码�Q?

    �?
    int pageNo;
    try{
        //可以通过参数pageno获得用户选择的页�?
        pageNo = Integer.parseInt(request.getParameter("pageno") );
    }catch(Exception ex){
        //默认为第一��?
        pageNo=1;
    }
    String gender = request.getParameter("gender" );
    request.setAttribute("empPage", myBean.getEmployee(gender, pageNo) );
    �?

//JSP昄��部分代码
<%@ page import = "page.RowSetPage"%>
 �?

 �?

性别�Q?
 ">

<%
 RowSetPage empPage = (RowSetPage)request.getAttribute("empPage");
 if (empPage == null ) empPage = RowSetPage.EMPTY_PAGE;
%>
 �?

 ID 代码用户�?lt;/td> 姓名
<%
 javax.sql.RowSet empRS = (javax.sql.RowSet) empPage.getRowSet();
 if (empRS!=null) while (empRS.next() ) {
%>

 <%= empRS.getString("EMP_ID")%>
 <%= empRS.getString("EMP_CODE")%>
 <%= empRS.getString("USER_NAME")%>
 <%= empRS.getString("REAL_NAME")%>

<%
 }// end while
%>

<%
 //昄��总页数和当前��|��(pageno)以及分页代码�?
 //此处doQuery为页面上提交查询动作的javascript函数名， pageno为标识当前页码的参数�?
%>
 <%= empPage .getHTML("doQuery", "pageno")%>

　　效果如图�Q?/p>

因�ؓ分页昄��一般都会伴有查询条件和查询动作�Q�页面应已经有校验查询条件和提交查询的javascript�Ҏ��Q�如上面的doQuery�Q�，所以RowSetPage.getHTML()生成的分��代码在用户选择新页码时直接回调前面的处理提交查询的javascript�Ҏ��。注意在昄��查询�l�果的时候上�ơ的查询条�g也需要保持，�?lt;input type=text name=gender size=1 value="<%=request.getParameter("gender")%>">。同时由于页码的参数名可以指定，因此也支持在同一��面中有多个分页区�?br />　　另一�U�分��代码实现是生成每一��늚�URL�Q�将查询参数和页码作为QueryString附在URL后面。这�U�方法的�~�陷是在查询条�g比较复杂旉��以处理，�q�且需要指定处理查询动作的servlet�Q�可能不适合某些定制的查询操作�?br />　　如果对RowSetPage.getHTML()生成的默认分��代码不满意可以�~�写自己的分��处理代码，RowSetPage提供了很多getter�Ҏ��用于获取相关信息�Q�如当前��늠�、总页数�?总记录数和当前记录数�{�）�?br />　　在实际应用中可以��分��|��询和昄��做成jsp taglib�Q?�q�一步简化JSP代码�Q�屏蔽Java Code�?/p>

附：分页工具�cȝ��源代码，有注释，应该很容易理解�?/p>

1.Page.java
2.RowSetPage.java(RowSetPage�l�承Page)
3.PagedStatement.java
4.PagedStatementOracleImpl.java(PagedStatementOracleImpl�l�承PagedStatement)

您可以�Q意��用这些源代码�Q�但必须保留author evan_zhao@hotmail.com字样

///////////////////////////////////
//
// Page.java
// author: evan_zhao@hotmail.com
//
///////////////////////////////////

package page;

import java.util.List;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;

/**
* Title: 分页对象

* Description: 用于包含数据及分��信息的对象

*               Page�c�d��C��用于昄��分页信息的基本方法，但未指定所含数据的�c�d��Q?
*               可根据需要实��C��特定方式�l�织数据的子�c�，

*               如RowSetPage以RowSet��装数据�Q�ListPage以List��装数据

* Copyright:    Copyright (c) 2002

* @author evan_zhao@hotmail.com

* @version 1.0
*/
public class Page implements java.io.Serializable {
    public static final Page EMPTY_PAGE = new Page();
    public static final int DEFAULT_PAGE_SIZE = 20;
    public static final int MAX_PAGE_SIZE = 9999;

private int myPageSize = DEFAULT_PAGE_SIZE;

    private int start;
    private int avaCount,totalSize;
    private Object data;

private int currentPageno;
private int totalPageCount;

    /**
     * 默认构造方法，只构造空��?
     */
    protected Page(){
        this.init(0,0,0,DEFAULT_PAGE_SIZE,new Object());
    }

    /**
     * 分页数据初始�Ҏ��Q�由子类调用
     * @param start 本页数据在数据库中的起始位置
     * @param avaCount 本页包含的数据条�?
     * @param totalSize 数据库中总记录条�?
     * @param pageSize 本页定w��
     * @param data 本页包含的数�?
     */
    protected void init(int start, int avaCount, int totalSize, int pageSize, Object data){

this.avaCount =avaCount;
this.myPageSize = pageSize;

this.start = start;
this.totalSize = totalSize;

this.data=data;

        //System.out.println("avaCount:"+avaCount);
        //System.out.println("totalSize:"+totalSize);
        if (avaCount>totalSize) {
            //throw new RuntimeException("记录条数大于��L��敎ͼ��Q?);
        }

this.currentPageno = (start -1)/pageSize +1;
this.totalPageCount = (totalSize + pageSize -1) / pageSize;

        if (totalSize==0 && avaCount==0){
            this.currentPageno = 1;
            this.totalPageCount = 1;
        }
        //System.out.println("Start Index to Page No: " + start + "-" + currentPageno);
    }

    public Object getData(){
        return this.data;
    }

    /**
     * 取本��|��据容量（本页能包含的记录敎ͼ�
     * @return 本页能包含的记录�?
     */
    public int getPageSize(){
        return this.myPageSize;
    }

/**
 * 是否有下一��?
 * @return 是否有下一��?
 */
 public boolean hasNextPage() {
 /*
 if (avaCount==0 && totalSize==0){
 return false;
 }
 return (start + avaCount -1) < totalSize;
 */
 return (this.getCurrentPageNo() }

    /**
     * 是否有上一��?
     * @return 是否有上一��?
     */
    public boolean hasPreviousPage() {
      /*
        return start > 1;
       */
      return (this.getCurrentPageNo()>1);
    }

    /**
     * 获取当前��늬�一条数据在数据库中的位�|?
     * @return
     */
    public int getStart(){
        return start;
    }

/**
 * 获取当前��|��后一条数据在数据库中的位�|?
 * @return
 */
 public int getEnd(){
 int end = this.getStart() + this.getSize() -1;
 if (end<0) {
 end = 0;
 }
 return end;
 }

    /**
     * 获取上一��늬�一条数据在数据库中的位�|?
     * @return 记录对应的rownum
     */
    public int getStartOfPreviousPage() {
        return Math.max(start-myPageSize, 1);
    }

    /**
     * 获取下一��늬�一条数据在数据库中的位�|?
     * @return 记录对应的rownum
     */
    public int getStartOfNextPage() {
        return start + avaCount;
    }

    /**
     * 获取��M��늬�一条数据在数据库中的位�|�，每页条数使用默认�?
     * @param pageNo ��号
     * @return 记录对应的rownum
     */
    public static int getStartOfAnyPage(int pageNo){
        return getStartOfAnyPage(pageNo, DEFAULT_PAGE_SIZE);
    }

/**
 * 获取��M��늬�一条数据在数据库中的位�|?
 * @param pageNo ��号
 * @param pageSize 每页包含的记录数
 * @return 记录对应的rownum
 */
 public static int getStartOfAnyPage(int pageNo, int pageSize){
 int startIndex = (pageNo-1) * pageSize + 1;
 if ( startIndex < 1) startIndex = 1;
 //System.out.println("Page No to Start Index: " + pageNo + "-" + startIndex);
 return startIndex;
 }

    /**
     * 取本��包含的记录�?
     * @return 本页包含的记录数
     */
    public int getSize() {
        return avaCount;
    }

    /**
     * 取数据库中包含的总记录数
     * @return 数据库中包含的总记录数
     */
    public int getTotalSize() {
        return this.totalSize;
    }

    /**
     * 取当前页�?
     * @return 当前��늠�
     */
    public int getCurrentPageNo(){
        return this.currentPageno;
    }

    /**
     * 取总页�?
     * @return 总页�?
     */
    public int getTotalPageCount(){
        return this.totalPageCount;
    }

/**
 *
 * @param queryJSFunctionName 实现分页的JS脚本名字�Q�页码变动时会自动回调该�Ҏ��
 * @param pageNoParamName ��늠�参数名称
 * @return
 */
 public String getHTML(String queryJSFunctionName, String pageNoParamName){
 if (getTotalPageCount()<1){
 return "";
 }
 if (queryJSFunctionName == null || queryJSFunctionName.trim().length()<1) {
 queryJSFunctionName = "gotoPage";
 }
 if (pageNoParamName == null || pageNoParamName.trim().length()<1){
 pageNoParamName = "pageno";
 }

String gotoPage = "_"+queryJSFunctionName;

        StringBuffer html = new StringBuffer("\n");
        html.append(" \n")
             .append( "");
        html.append( " \n")
             .append( " \n")
             .append( "
\n");
        html.append( "       �? ).append( getTotalPageCount() ).append( "��?)
             .append( "       [") .append(getStart()).append("..").append(getEnd())
             .append("/").append(this.getTotalSize()).append("] \n")
             .append( "    \n")
             .append( "    \n");
        if (hasPreviousPage()){
             html.append( "[上一��?lt;/a>]   \n");
        }
        html.append( "       �W?)
             .append(   "        ��?\n");
        if (hasNextPage()){
             html.append( "    [下一��?lt;/a>]   \n");
        }
        html.append( " \n");

return html.toString();

}
}

///////////////////////////////////
//
// RowSetPage.java
// author: evan_zhao@hotmail.com
//
///////////////////////////////////
package page;

import javax.sql.RowSet;

/**
*

Title: RowSetPage

Description: 使用RowSet��装数据的分��对�?lt;/p>
*

* @author evan_zhao@hotmail.com
* @version 1.0
*/

public class RowSetPage extends Page {
private javax.sql.RowSet rs;

    /**
     *�I�页
     */
    public static final RowSetPage EMPTY_PAGE = new RowSetPage();

    /**
     *默认构造方法，创徏�I�页
     */
    public RowSetPage(){
      this(null, 0,0);
    }

    /**
     *构造分��对�?
     *@param crs 包含一��|��据的OracleCachedRowSet
     *@param start 该页数据在数据库中的起始位置
     *@param totalSize 数据库中包含的记录��L��
     */
    public RowSetPage(RowSet crs, int start, int totalSize) {
        this(crs,start,totalSize,Page.DEFAULT_PAGE_SIZE);
    }

    /**
     *构造分��对�?
     *@param crs 包含一��|��据的OracleCachedRowSet
     *@param start 该页数据在数据库中的起始位置
     *@param totalSize 数据库中包含的记录��L��
     *@pageSize 本页能容�U�的记录�?
     */
    public RowSetPage(RowSet crs, int start, int totalSize, int pageSize) {
        try{
            int avaCount=0;
            if (crs!=null) {
                crs.beforeFirst();
                if (crs.next()){
                    crs.last();
                    avaCount = crs.getRow();
                }
                crs.beforeFirst();
            }
            rs = crs;
            super.init(start,avaCount,totalSize,pageSize,rs);
        }catch(java.sql.SQLException sqle){
            throw new RuntimeException(sqle.toString());
        }
    }

    /**
     *取分��对象中的记录数�?
     */
    public javax.sql.RowSet getRowSet(){
        return rs;
    }

}

///////////////////////////////////
//
// PagedStatement.java
// author: evan_zhao@hotmail.com
//
///////////////////////////////////

package page;

import foo.DBUtil;

import java.math.BigDecimal;
import java.util.List;
import java.util.Iterator;
import java.util.Collections;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.PreparedStatement;
import java.sql.Timestamp;
import javax.sql.RowSet;

/**
*

Title: 分页查询

Description: �Ҏ��查询语句和页码查询出当页数据

* @author evan_zhao@hotmail.com
* @version 1.0
*/
public abstract class PagedStatement {
public final static int MAX_PAGE_SIZE = Page.MAX_PAGE_SIZE;

    protected String countSQL, querySQL;
    protected int pageNo,pageSize,startIndex,totalCount;
    protected javax.sql.RowSet rowSet;
    protected RowSetPage rowSetPage;

private List boundParams;

    /**
     * 构造一查询出所有数据的PageStatement
     * @param sql query sql
     */
    public PagedStatement(String sql){
        this(sql,1,MAX_PAGE_SIZE);
    }

    /**
     * 构造一查询出当��|��据的PageStatement
     * @param sql query sql
     * @param pageNo ��늠�
     */
    public PagedStatement(String sql, int pageNo){
        this(sql, pageNo, Page.DEFAULT_PAGE_SIZE);
    }

    /**
     * 构造一查询出当��|��据的PageStatement�Q��ƈ指定每页昄��记录条数
     * @param sql query sql
     * @param pageNo ��늠�
     * @param pageSize 每页定w��
     */
    public PagedStatement(String sql, int pageNo, int pageSize){
        this.pageNo = pageNo;
        this.pageSize = pageSize;
        this.startIndex = Page.getStartOfAnyPage(pageNo, pageSize);
        this.boundParams = Collections.synchronizedList(new java.util.LinkedList());

        this.countSQL = "select count(*) from ( " + sql +") ";
        this.querySQL = intiQuerySQL(sql, this.startIndex, pageSize);
    }

    /**
     *生成查询一��|��据的sql语句
     *@param sql 原查询语�?
     *@startIndex 开始记录位�|?
     *@size 需要获取的记录�?
     */
    protected abstract String intiQuerySQL(String sql, int startIndex, int size);

    /**
     *使用�l�出的对象设�|�指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param obj 包含参数值的对象
     */
    public void setObject(int index, Object obj) throws SQLException{
        BoundParam bp = new BoundParam(index, obj);
        boundParams.remove(bp);
        boundParams.add( bp);
    }

    /**
     *使用�l�出的对象设�|�指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param obj 包含参数值的对象
     *@param targetSqlType 参数的数据库�c�d��
     */
    public void setObject(int index, Object obj, int targetSqlType) throws SQLException{
        BoundParam bp = new BoundParam(index, obj, targetSqlType);
        boundParams.remove(bp);
        boundParams.add(bp );
    }

    /**
     *使用�l�出的对象设�|�指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param obj 包含参数值的对象
     *@param targetSqlType 参数的数据库�c�d��(帔R��定义在java.sql.Types�?
     *@param scale �_�ֺ��Q�小数点后的位数
     * �Q�只对targetSqlType是Types.NUMBER或Types.DECIMAL有效�Q�其它类型则忽略�Q?
     */
    public void setObject(int index, Object obj, int targetSqlType, int scale) throws SQLException{
        BoundParam bp = new BoundParam(index, obj, targetSqlType, scale) ;
        boundParams.remove(bp);
        boundParams.add(bp);
    }

    /**
     *使用�l�出的字�W�串讄��指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param str 包含参数值的字符�?
     */
    public void setString(int index, String str)throws SQLException{
        BoundParam bp = new BoundParam(index, str) ;
        boundParams.remove(bp);
        boundParams.add(bp);
    }

    /**
     *使用�l�出的字�W�串讄��指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param timestamp 包含参数值的旉��?
     */
    public void setTimestamp(int index, Timestamp timestamp)throws SQLException{
        BoundParam bp = new BoundParam(index, timestamp) ;
        boundParams.remove(bp);
        boundParams.add( bp );
    }

    /**
     *使用�l�出的整数设�|�指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param value 包含参数值的整数
     */
    public void setInt(int index, int value)throws SQLException{
        BoundParam bp = new BoundParam(index, new Integer(value)) ;
        boundParams.remove(bp);
        boundParams.add( bp );
    }

    /**
     *使用�l�出的长整数讄��指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param value 包含参数值的长整�?
     */
    public void setLong(int index, long value)throws SQLException{
        BoundParam bp = new BoundParam(index, new Long(value)) ;
        boundParams.remove(bp);
        boundParams.add( bp );
    }

    /**
     *使用�l�出的双�_�ֺ��点数设�|�指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param value 包含参数值的双精度��Q�Ҏ��
     */
    public void setDouble(int index, double value)throws SQLException{
        BoundParam bp = new BoundParam(index, new Double(value))   ;
        boundParams.remove(bp);
        boundParams.add( bp);
    }

    /**
     *使用�l�出的BigDecimal讄��指定参数的�?
     *@param index �W�一个参��Cؓ1�Q�第二个�?�Q�。。�?
     *@param bd 包含参数值的BigDecimal
     */
    public void setBigDecimal(int index, BigDecimal bd)throws SQLException{
        BoundParam bp =   new BoundParam(index, bd )   ;
        boundParams.remove(bp);
        boundParams.add( bp);
    }

    private void setParams(PreparedStatement pst) throws SQLException{
        if (pst==null || this.boundParams==null || this.boundParams.size()==0 ) return ;
        BoundParam param;
        for (Iterator itr = this.boundParams.iterator();itr.hasNext();){
            param = (BoundParam) itr.next();
            if (param==null) continue;
            if (param.sqlType == java.sql.Types.OTHER){
                pst.setObject(param.index, param.value);
            }else{
                pst.setObject(param.index, param.value, param.sqlType, param.scale);
            }
        }
    }

    /**
     * 执行查询取得一��|��据，执行�l�束后关闭数据库�q�接
     * @return RowSetPage
     * @throws SQLException
     */
    public RowSetPage executeQuery() throws SQLException{
        System.out.println("executeQueryUsingPreparedStatement");
        Connection conn = DBUtil.getConnection();
        PreparedStatement pst = null;
        ResultSet rs = null;
        try{
            pst = conn.prepareStatement(this.countSQL);
            setParams(pst);
            rs =pst.executeQuery();
            if (rs.next()){
                totalCount = rs.getInt(1);
            } else {
                totalCount = 0;
            }

rs.close();
pst.close();

if (totalCount < 1 ) return RowSetPage.EMPTY_PAGE;

            pst = conn.prepareStatement(this.querySQL);
            System.out.println(querySQL);
            pst.setFetchSize(this.pageSize);
            setParams(pst);
            rs =pst.executeQuery();
            //rs.setFetchSize(pageSize);

this.rowSet = populate(rs);

            rs.close();
            rs = null;
            pst.close();
            pst = null;

            this.rowSetPage = new RowSetPage(this.rowSet,startIndex,totalCount,pageSize);
            return this.rowSetPage;
        }catch(SQLException sqle){
            //System.out.println("executeQuery SQLException");
            sqle.printStackTrace();
            throw sqle;
        }catch(Exception e){
            e.printStackTrace();
            throw new RuntimeException(e.toString());
        }finally{
            //System.out.println("executeQuery finally");
            DBUtil.close(rs, pst, conn);
        }
    }

    /**
     *��ResultSet数据填充�q�CachedRowSet
     */
    protected abstract RowSet populate(ResultSet rs) throws SQLException;

    /**
     *取封装成RowSet查询�l�果
     *@return RowSet
     */
    public javax.sql.RowSet getRowSet(){
        return this.rowSet;
    }

    /**
     *取封装成RowSetPage的查询结�?
     *@return RowSetPage
     */
    public RowSetPage getRowSetPage() {
        return this.rowSetPage;
    }

    /**
     *关闭数据库连�?
     */
    public void close(){
        //因�ؓ数据库连接在查询�l�束或发生异常时卛_��闭，此处不做��M��事情
        //留待扩充�?
    }

    private class BoundParam {
        int index;
        Object value;
        int sqlType;
        int scale;

        public BoundParam(int index, Object value) {
            this(index, value, java.sql.Types.OTHER);
        }

        public BoundParam(int index, Object value, int sqlType) {
            this(index, value, sqlType, 0);
        }

        public BoundParam(int index, Object value, int sqlType, int scale) {
            this.index = index;
            this.value = value;
            this.sqlType = sqlType;
            this.scale = scale;
        }

        public boolean equals(Object obj){
            if (obj!=null && this.getClass().isInstance(obj)){
                BoundParam bp = (BoundParam)obj;
                if (this.index==bp.index) return true;
            }
            return false;
        }
    }

}

///////////////////////////////////
//
// PagedStatementOracleImpl.java
// author: evan_zhao@hotmail.com
//
///////////////////////////////////
package page;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.RowSet;
import oracle.jdbc.rowset.OracleCachedRowSet;

/**
*

Title: 分页查询Oracle数据库实�?lt;/p>
*

* @author evan_zhao@hotmail.com
* @version 1.0
*/
public class PagedStatementOracleImpl extends PagedStatement {

    /**
     * 构造一查询出所有数据的PageStatement
     * @param sql query sql
     */
    public PagedStatementOracleImpl(String sql){
        super(sql);
    }

    /**
     * 构造一查询出当��|��据的PageStatement
     * @param sql query sql
     * @param pageNo ��늠�
     */
    public PagedStatementOracleImpl(String sql, int pageNo){
        super(sql, pageNo);
    }

    /**
     * 构造一查询出当��|��据的PageStatement�Q��ƈ指定每页昄��记录条数
     * @param sql query sql
     * @param pageNo ��늠�
     * @param pageSize 每页定w��
     */
    public PagedStatementOracleImpl(String sql, int pageNo, int pageSize){
        super(sql, pageNo, pageSize);
    }

/**
 *生成查询一��|��据的sql语句
 *@param sql 原查询语�?
 *@startIndex 开始记录位�|?
 *@size 需要获取的记录�?
 */
 protected String intiQuerySQL(String sql, int startIndex, int size){
 StringBuffer querySQL = new StringBuffer();
 if (size != super.MAX_PAGE_SIZE) {
 querySQL.append("select * from (select my_table.*,rownum as my_rownum from(")
 .append( sql)
 .append(") my_table where rownum<").append(startIndex + size)
 .append(") where my_rownum>=").append(startIndex);
 } else {
 querySQL.append("select * from (select my_table.*,rownum as my_rownum from(")
 .append(sql)
 .append(") my_table ")
 .append(") where my_rownum>=").append(startIndex);
 }
 return querySQL.toString();
 }

    /**
     *��ResultSet数据填充�q�CachedRowSet
     */
    protected RowSet populate(ResultSet rs) throws SQLException{
        OracleCachedRowSet ocrs = new OracleCachedRowSet();
        ocrs.populate(rs);
        return ocrs;
    }

}

李云�?/a> 2007-07-28 12:26 发表评论

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