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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: !_"@^?,q  
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  CountBean.java IW>T}@ |  
;t'5},(FP  
/* 7zA'ri3w  
* CountData.java 8R2QZXJb-  
* Jy^u?  
* Created on 2007年1月1日, 下午4:44 >5_2_Y$"  
* "/)#O~  
* To change this template, choose Tools | Options and locate the template under a<@1 -j<  
* the Source Creation and Management node. Right-click the template and choose ztnFhJ<a$  
* Open. You can then make changes to the template in the Source Editor. MPCBT!o4Z  
*/ M:XSQ["6>V  
}d&_q7L@@6  
  package com.tot.count; V E#Wb7  
c(J!~7  
/** O#b6mKPt;t  
* O|\J}rm'  
* @author x%}^hiO<q  
*/ ,">]`|?  
public class CountBean { 7_%"BVb"  
 private String countType; {`J)j6;  
 int countId; Hv!U| L  
 /** Creates a new instance of CountData */ `lQ3C{}  
 public CountBean() {} 'r4/e-`pK  
 public void setCountType(String countTypes){ ]*v dSr-J  
  this.countType=countTypes; j`oy`78O  
 } tU4s'J  
 public void setCountId(int countIds){ 3XL#0\im?s  
  this.countId=countIds; Qr1"Tk7s  
 } ~Am,%"%\  
 public String getCountType(){ Cf TfL3(J  
  return countType; (^s>m,h  
 } O9vQp  
 public int getCountId(){ 5pj22 s  
  return countId; E'G4Y-  
 } N8k00*p65  
} 6 2'j!"xv  
S)lkz'tdk  
  CountCache.java #EO9UW5  
t=|evOz]  
/* (gy#js #  
* CountCache.java &{ay=Mj  
* 0":ib0=  
* Created on 2007年1月1日, 下午5:01 T29Dt  
* YX=a#%vrl  
* To change this template, choose Tools | Options and locate the template under kv3E4,<9  
* the Source Creation and Management node. Right-click the template and choose 3_txg>P"  
* Open. You can then make changes to the template in the Source Editor. <<@bl@9'  
*/ , 0imiv  
$@"l#vJPfc  
package com.tot.count; Y -pzy']4  
import java.util.*; .JYaH?  
/** }B8IBveu  
* kB3H="3[[  
* @author m4aB*6<lq  
*/ ZZ k=E4aae  
public class CountCache { >{N9kW Y  
 public static LinkedList list=new LinkedList(); Kh,V.+7k  
 /** Creates a new instance of CountCache */ J]v%q,"  
 public CountCache() {} aIJt0;  
 public static void add(CountBean cb){ ~5_Ad\n9  
  if(cb!=null){ pv*,gSS  
   list.add(cb); Y'yH;M z  
  } (}a8"]Z  
 } 9bP^`\K[N  
} q-.,nMUF  
SNfr"2c'h~  
 CountControl.java Px$/ _`H  
0TCBQ~"  
 /* plUZ"Tr  
 * CountThread.java WfWN(:dF  
 * "^4_@ oo  
 * Created on 2007年1月1日, 下午4:57 t\Nq R  
 * ?kWC}k{  
 * To change this template, choose Tools | Options and locate the template under |?rNy=P,  
 * the Source Creation and Management node. Right-click the template and choose 21 O'M  
 * Open. You can then make changes to the template in the Source Editor. .P;*Dws  
 */ X*M#FT-  
?!9 )q.bW  
package com.tot.count; yOphx07 (  
import tot.db.DBUtils; 74H)|Dkx  
import java.sql.*; %70~M_  
/** L%BNz3:Dt  
* TatpXN\  
* @author >SML"+>  
*/ TcIcS]w%  
public class CountControl{ [K9'<Qnu  
 private static long lastExecuteTime=0;//上次更新时间  \n{qsf:  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 {. 2k6_1[  
 /** Creates a new instance of CountThread */ xgpi-l  
 public CountControl() {} 9^,Lc1"M>  
 public synchronized void executeUpdate(){ x97 j  
  Connection conn=null; x$IX5:E#e  
  PreparedStatement ps=null; bLe <G  
  try{ ,8:(OB|a  
   conn = DBUtils.getConnection(); _z'u pb&  
   conn.setAutoCommit(false); i 7_ _  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); U'8bdsF_  
   for(int i=0;i<CountCache.list.size();i++){  /<HRwG\w  
    CountBean cb=(CountBean)CountCache.list.getFirst(); P/c&@_b  
    CountCache.list.removeFirst(); fIj|4a+  
    ps.setInt(1, cb.getCountId()); Pf|siC^;s~  
    ps.executeUpdate();⑴ QrfG^GID  
    //ps.addBatch();⑵ 'qjeXqGH$  
   } JQV%fTHS  
   //int [] counts = ps.executeBatch();⑶ LA@w:Fg  
   conn.commit(); "]z-: \ V  
  }catch(Exception e){ dQ_!)f&w1  
   e.printStackTrace(); ~V&aUDO>/  
  } finally{ h(M#f7'~&  
  try{  TR<<+  
   if(ps!=null) { k%D+Y(WGz8  
    ps.clearParameters(); ,=tD8@a<  
ps.close(); |p><'Q% *  
ps=null; Tsgk/e9K2?  
  } 4"{ooy^Q  
 }catch(SQLException e){} 2ggdWg7z  
 DBUtils.closeConnection(conn); ^~G8?]w  
 } ^SxY IFL  
} MP_'D+LS  
public long getLast(){ U4gF(Q  
 return lastExecuteTime; '@p['#\uI  
} @c<3b2  
public void run(){ LUuZ9$t0J"  
 long now = System.currentTimeMillis(); 6xWe=QGE  
 if ((now - lastExecuteTime) > executeSep) { hJDi7P  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); :Qumb  
  //System.out.print(" now:"+now+"\n"); >iD )eB  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pV20oSJNt  
  lastExecuteTime=now; MKy[hT:  
  executeUpdate(); zY,r9<I8_x  
 } )6+eNsxMlC  
 else{ >c9a0A  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); nx8a$vI-TY  
 } FP;Ccl"s  
} s0DGC  
} jJuW-(/4[  
//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 Q.]}]QE   
lD"(MQV@0  
  类写好了,下面是在JSP中如下调用。 uM_#  
iTag+G4*  
<% P5 K' p5}#  
CountBean cb=new CountBean(); *tgnYa[l  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); | \'rP_I>  
CountCache.add(cb); W6"v)Jc>_  
out.print(CountCache.list.size()+"<br>"); KcK>%%  
CountControl c=new CountControl(); VwOW=4`6  
c.run(); Svc|0Ad&  
out.print(CountCache.list.size()+"<br>"); t: #6sF  
%>
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