看了champion的文章《灵活的计数器的设计与实现》与源码，（这篇文章在
http://champion.ewuxi.com/old/opensource/my/count.htm），就做了这个练习。用session来计数，它是将访问量保存在一个xml文件中，读写xml文件用的是Castor。
<table width="664" border="0"> <tr> <td width="386">一、这是jsp调用页testcount.jsp
<%@ page import="java.util.Date" %>
<%@ page import="count.CountXml" %>
计算器测试
<%
CountXml xmlcount=CountXml.getInstance();
if (session.isNew()){
xmlcount.addcount(new Date());//增加访问量
int n =xmlcount.getTotalCount();//取总访问量
String count=Integer.toString(n);
session.putValue("count",count);
}
</td> <td width="268"> </td> </tr> </table>
%>
您是第<%=session.getValue("count")%>位访问者
总访问量： <%=xmlcount.getTotalCount() %>
本年访问量：<%=xmlcount.getYearCount() %>
本月访问量：<%=xmlcount.getMonthCount() %>
本周访问量：<%=xmlcount.getWeekCount() %>
本日访问量：<%=xmlcount.getDayCount() %>
二、用到的两个类
1、CountXml.java
package count;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStream;
import java.util.Properties;
import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import org.exolab.castor.xml.Marshaller;
import org.exolab.castor.xml.Unmarshaller;
public class CountXml{
private String fileName = "h:\\Tomcat 5.0\\webapps\\zz3zcwbwebhome\\WEB-INF\\xmlcount.xml";
private static CountObjectInf obj=null;
private static CountXml instance=null;
public static CountXml getInstance(){
if(instance==null){
instance=new CountXml();
}
return instance;
}
private CountXml() {
try{
obj=read(fileName);
}catch(Exception e){
System.out.println(e);
}
}
public int getTotalCount(){
return obj.getTotalCount();
}
public int getDayCount() {
return obj.getDayCount();
}
public int getMonthCount() {
return obj.getMonthCount();
}
public int getWeekCount() {
return obj.getWeekCount();
}
public int getYearCount() {
return obj.getYearCount();
}
public synchronized void addcount(Date da){//比较日期增加计数
if (new SimpleDateFormat("yyyy-MM-dd").format(this.obj.date)
.equals(new SimpleDateFormat("yyyy-MM-dd").format(da)))
this.obj.setDayCount(this.obj.getDayCount() + 1);
else
this.obj.setDayCount(1);
if (new SimpleDateFormat("yyyy-MM").format(this.obj.date)
.equals(new SimpleDateFormat("yyyy-MM").format(da)))
this.obj.setMonthCount(this.obj.getMonthCount() + 1);
else
obj.setMonthCount(1);
Calendar ca = Calendar.getInstance();
ca.setTime(da);
ca.setFirstDayOfWeek(Calendar.MONDAY);
if (ca.get(Calendar.DAY_OF_WEEK) == Calendar.MONDAY && !new SimpleDateFormat("yyyy-MM-dd").format(this.obj.date).equals(new SimpleDateFormat("yyyy-MM-dd").format(da)))
obj.setWeekCount(1);
else
obj.setWeekCount(obj.getWeekCount() + 1);
if (new SimpleDateFormat("yyyy").format(this.obj.date)
.equals(new SimpleDateFormat("yyyy").format(da)))
this.obj.setYearCount(this.obj.getYearCount() + 1);
else
obj.setYearCount(1);
obj.setDate(da);
obj.setTotalCount(obj.getTotalCount()+1);
obj.setTempCount(obj.getTempCount()+1);
if(obj.getTempCount()>=20){//只有当临时访问量大于等于20时才保存一次
obj.setTempCount(0);//临时计数器置0
write(fileName);
}
}
private void write(String fileName) {
try {
FileWriter writer = new FileWriter(fileName);
Marshaller.marshal(obj, writer);
writer.close();
} catch (Exception e) {
System.out.println(e);
}
}
private CountObjectInf read(String fileName) throws Exception {
FileReader reader = new FileReader(fileName);
CountObjectInf result = (CountObjectInf)
Unmarshaller.unmarshal(CountObjectInf.class, reader);
reader.close();
return result;
}
}
2、
package count;
import java.util.Date;
public class CountObjectInf {
// 总访问量合计
protected int totalCount = 0;
//日访问量
protected int dayCount = 0;
//周访问量
protected int weekCount = 0;
// 月访问量
protected int monthCount = 0;
//年访问量
protected int yearCount = 0;
//临时访问量
protected int tempCount=0;
protected Date date =new Date();
/**
* @return
*/
public int getDayCount() {
return dayCount;
}
/**
* @return
*/
public int getMonthCount() {
return monthCount;
}
/**
* @return
*/
public int getTotalCount() {
return totalCount;
}
/**
* @return
*/
public int getWeekCount() {
return weekCount;
}
/**
* @return
*/
public int getYearCount() {
return yearCount;
}
/**
* @param i
*/
public void setDayCount(int i) {
dayCount = i;
}
/**
* @param i
*/
public void setMonthCount(int i) {
monthCount = i;
}
/**
* @param i
*/
public void setTotalCount(int i) {
totalCount = i;
}
/**
* @param i
*/
public void setWeekCount(int i) {
weekCount = i;
}
/**
* @param i
*/
public void setYearCount(int i) {
yearCount = i;
}
/**
* @return
*/
public Date getDate() {
return date;
}
/**
* @param date
*/
public void setDate(Date date) {
this.date = date;
}
/**
* @return
*/
public int getTempCount() {
return tempCount;
}
/**
* @param i
*/
public void setTempCount(int i) {
tempCount = i;
}
}
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