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JSP高访问量下的计数程序

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有时要为每一篇文章统计其点击次数,如果每一次浏览都要更新一次库的话,那性能在访问量很大的情况下,服务器的压力就会很大了,比较好一点的方法就是先将要更新的数据缓存起来,然后每隔一段时间再利用数据库的批量处理,批量更新库。源码如下: =*:_swd  
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  CountBean.java zpr@!76  
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/* n.XhK_6n]M  
* CountData.java 4J 51i*`  
* dtnet_j  
* Created on 2007年1月1日, 下午4:44 pvQK6r  
* >g"M.gW  
* To change this template, choose Tools | Options and locate the template under ^8l3j4  
* the Source Creation and Management node. Right-click the template and choose 3?Eoj95w!  
* Open. You can then make changes to the template in the Source Editor. $gl<{{  
*/ $#ju?B~  
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  package com.tot.count; N|O]z  
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/** n$|c{2]=  
* .0fh>kQ  
* @author 9}jq`xSL  
*/ R~5* #r@f  
public class CountBean { SM#S/|.]  
 private String countType; CndgfOF  
 int countId; 27 145  
 /** Creates a new instance of CountData */ ;!JX-Jq  
 public CountBean() {} i$^B-  
 public void setCountType(String countTypes){ Q$h:[_v  
  this.countType=countTypes; "3i80R\w`F  
 } _X2EBpZp  
 public void setCountId(int countIds){ fxoi<!|iGY  
  this.countId=countIds; Ag4Ga?&8ec  
 } -6~y$c&c  
 public String getCountType(){ Z'*Z@u3  
  return countType; 7kX$wQZ_  
 } !MJe+.  
 public int getCountId(){ ,Lun-aMd  
  return countId; ;y~{+{{Ow  
 } "`i:)Et  
} D@\;@( |  
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  CountCache.java c6Aut`dK  
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/* ^L-w(r62<  
* CountCache.java r2GK_$vd  
* r -q3+c^+  
* Created on 2007年1月1日, 下午5:01 z'oiyXEE3  
* ) {  
* To change this template, choose Tools | Options and locate the template under }uI7 \\S  
* the Source Creation and Management node. Right-click the template and choose G]mWaA  
* Open. You can then make changes to the template in the Source Editor. >'}=.3\  
*/ h#m:Y~GoF  
$# !UGY  
package com.tot.count; pgd8`$(Q  
import java.util.*; RE>ks[  
/** Gl8&FrR  
* O%JsUKV  
* @author EwD3d0udL  
*/ '-PMF~~S  
public class CountCache {  Vp] D  
 public static LinkedList list=new LinkedList(); 9XoQO9*Q  
 /** Creates a new instance of CountCache */ ^K.u ~p   
 public CountCache() {} G=Hf&l  
 public static void add(CountBean cb){ t `Y!"l  
  if(cb!=null){ GT'7,+<?N  
   list.add(cb); Zv|p>q`R2  
  } 09 39i_  
 } /j' B\,  
} F?8BS*r_  
'cAc{\)  
 CountControl.java *j /S4qG  
JS/M~8+Et  
 /* ) Ab6!"'  
 * CountThread.java 6hM]%  
 * sp=OT-Pfp  
 * Created on 2007年1月1日, 下午4:57 )W`SC mr]  
 * ',JrY)  
 * To change this template, choose Tools | Options and locate the template under 4N~+G `  
 * the Source Creation and Management node. Right-click the template and choose ,'C30A*p  
 * Open. You can then make changes to the template in the Source Editor. v. Xoq  
 */ $Ei o$TI  
JYwyR++uo  
package com.tot.count; xEVLE,*?>  
import tot.db.DBUtils; JvfQib  
import java.sql.*; oe!:|ck<  
/** 7}?k^x,1  
* 2f|6z- Z  
* @author OQ(D5GR:4  
*/ \9]I#Ih}M  
public class CountControl{ LZM,QQ  
 private static long lastExecuteTime=0;//上次更新时间  \T`["<  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 .73zik   
 /** Creates a new instance of CountThread */ hhpv\1h#  
 public CountControl() {} G[3k  
 public synchronized void executeUpdate(){ 6x_ T@  
  Connection conn=null; 4L5o\'X  
  PreparedStatement ps=null; ieo|%N{'  
  try{ Z&FkLww  
   conn = DBUtils.getConnection(); x" 'KW (  
   conn.setAutoCommit(false); K DYYB6|  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); {)V?R  
   for(int i=0;i<CountCache.list.size();i++){ 4l&"]9D  
    CountBean cb=(CountBean)CountCache.list.getFirst(); gEv->pc  
    CountCache.list.removeFirst(); =n-z;/NL  
    ps.setInt(1, cb.getCountId()); ohrw\<xsu  
    ps.executeUpdate();⑴ g4:VR:o  
    //ps.addBatch();⑵ %5JW< 9  
   } -B1YZ/.rz"  
   //int [] counts = ps.executeBatch();⑶ co5y"yj_  
   conn.commit(); xfq]9<  
  }catch(Exception e){ nW4Vct  
   e.printStackTrace(); z,{e]MB)M  
  } finally{ u12zRdn  
  try{ 8RdP:*HY  
   if(ps!=null) { E@w[&#  
    ps.clearParameters(); 'h-3V8m^e  
ps.close(); O)`fvpVU  
ps=null; Bx(yu'g|a  
  } ! FNf>z+  
 }catch(SQLException e){} 5x8'K7/4.  
 DBUtils.closeConnection(conn);  YywEZ?X  
 } ],8;eq%W)  
} E: 9o;JU  
public long getLast(){ % f2<U;ff  
 return lastExecuteTime; iQt!PMF.  
} cYGRy,'gH  
public void run(){ 2B7h9P.NB  
 long now = System.currentTimeMillis(); ,e9CJ~a  
 if ((now - lastExecuteTime) > executeSep) { u8Y~_)\MA  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); '#v71,  
  //System.out.print(" now:"+now+"\n"); XQ]`&w(  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); #gh p/YoTq  
  lastExecuteTime=now; ngP7'1I  
  executeUpdate(); _6;<ow  
 } NB E pM  
 else{ $ye^uu;Z  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); xXF2"+  
 } (NX)o P  
} ajW[eyX  
} nV'3sUvR#  
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 [#p&D~Du&  
>DL/ ..  
  类写好了,下面是在JSP中如下调用。 ~}BJ0P(VMc  
_=ugxL #eB  
<% W1v CN31  
CountBean cb=new CountBean(); Fse['O~  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); eY T8$  
CountCache.add(cb); 9"~9hOEct  
out.print(CountCache.list.size()+"<br>"); #wF1  
CountControl c=new CountControl(); Dy su{rL  
c.run(); p ZtgIS(3  
out.print(CountCache.list.size()+"<br>"); lLH$`Wnv  
%>
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