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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: +}Av-47`h  
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  CountBean.java Ol$WpM  
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/* _ IeU+tS  
* CountData.java 71C42=AU  
* 6bBdIqGb}  
* Created on 2007年1月1日, 下午4:44 'lZ.j&  
* dC}`IR  
* To change this template, choose Tools | Options and locate the template under /=?ETth @  
* the Source Creation and Management node. Right-click the template and choose +%\oO/4Fs  
* Open. You can then make changes to the template in the Source Editor. @/UfD ye  
*/ Iak0 [6Ey  
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  package com.tot.count; u-"c0@  
-=698h*  
/** ]S 7^ITn  
* nY $tp  
* @author ^Y{D^\} ,  
*/ *V(Fn-6(  
public class CountBean { H6aM&r9}  
 private String countType; Q:6VYONN  
 int countId; V^Rkt%JY  
 /** Creates a new instance of CountData */ tZ2e!<C  
 public CountBean() {} [0[M'![8M  
 public void setCountType(String countTypes){  BGzI  
  this.countType=countTypes; @ \2#Dpr  
 } hnWo|! ,O$  
 public void setCountId(int countIds){ #=}$OFg  
  this.countId=countIds; R.s|j=  
 } 2i|B=D(  
 public String getCountType(){ %]p6Kn/>  
  return countType; =8=!Yc(>  
 } >5T_g2pkv  
 public int getCountId(){ 9j*0D("  
  return countId; ) uP\>vRy  
 } A>.2OC+  
} p4VSm a_(  
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  CountCache.java VhEMk\  
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/* GD-&_6a  
* CountCache.java }%{MPqg  
* {F|48P;J  
* Created on 2007年1月1日, 下午5:01 .I$}KE)  
* H;WY!X$x  
* To change this template, choose Tools | Options and locate the template under 8Z85D  
* the Source Creation and Management node. Right-click the template and choose =neL}Fav56  
* Open. You can then make changes to the template in the Source Editor. 3]JZu9#  
*/ (P6vOo  
6g>)6ux>aV  
package com.tot.count; vuz4qCQ  
import java.util.*; U\+&cob.  
/** /vE]2Io  
* +pqM ^3t|y  
* @author em2_pq9q  
*/ t^E hE  
public class CountCache { d`Q7"}uZ  
 public static LinkedList list=new LinkedList(); 6Gn4asoA  
 /** Creates a new instance of CountCache */ ELa ja87  
 public CountCache() {} A[UP"P~u/  
 public static void add(CountBean cb){ u@%|k c`  
  if(cb!=null){ e,A)U5X  
   list.add(cb); Ul Mi.;/^  
  } gdj^df+2F  
 } |)_-Bi;MW`  
} &S74mV  
AH{^spD{7,  
 CountControl.java G%TL/Z40  
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 /* h[XGC =%  
 * CountThread.java ;_<)JqUh  
 * J7-^F)lu-  
 * Created on 2007年1月1日, 下午4:57 o4=Yu7L  
 * Gk~l,wV>  
 * To change this template, choose Tools | Options and locate the template under cQpnEO&SL  
 * the Source Creation and Management node. Right-click the template and choose MmU%%2QG  
 * Open. You can then make changes to the template in the Source Editor. 6!EYrX}rI[  
 */ G5]1s  
9 -jO,l  
package com.tot.count; {,O`rW_eS  
import tot.db.DBUtils; k3@HI|  
import java.sql.*; $R{8z-,Q  
/** g8pm2o@S  
* B94 &elu  
* @author UCqs}U8  
*/ aW5~Be$ _  
public class CountControl{ qJ[@:&:  
 private static long lastExecuteTime=0;//上次更新时间  hhR aJ  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 't>r sp+#  
 /** Creates a new instance of CountThread */ CdhSp$>  
 public CountControl() {} @Hr+/52B  
 public synchronized void executeUpdate(){ ?p8k{N(1  
  Connection conn=null; r!/0 j)  
  PreparedStatement ps=null; nx4P^P C  
  try{ tGqCt9;<  
   conn = DBUtils.getConnection(); 7$b?m6fmK  
   conn.setAutoCommit(false); m=&j@  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); zsTbdF  
   for(int i=0;i<CountCache.list.size();i++){ `"y{;PCt_  
    CountBean cb=(CountBean)CountCache.list.getFirst(); ?9U:g(v  
    CountCache.list.removeFirst(); ged,>  
    ps.setInt(1, cb.getCountId()); gAE!a Ky  
    ps.executeUpdate();⑴ CD?&<NV  
    //ps.addBatch();⑵ (M% ;~y\  
   } RLKj u;u  
   //int [] counts = ps.executeBatch();⑶ ,@Z_{,b  
   conn.commit(); Rlc$; Z9K  
  }catch(Exception e){ _dmL}t-  
   e.printStackTrace(); s j9D  
  } finally{ Ob&W_D^=N  
  try{ r*cjOrvI  
   if(ps!=null) { WL~`u  
    ps.clearParameters(); ?ei%RWo  
ps.close(); kHU"AD}.  
ps=null; 8&a_A:h  
  } !7` [i  
 }catch(SQLException e){} M9V-$ _)  
 DBUtils.closeConnection(conn); ch,|1}bi  
 } .S vyj  
} }V^e7d  
public long getLast(){ WV_`1hZX  
 return lastExecuteTime; F RH&B5w  
} |>s v8/!  
public void run(){ 44C+h    
 long now = System.currentTimeMillis(); Fd !iQ  
 if ((now - lastExecuteTime) > executeSep) { :Ee?K  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); ],?pe  
  //System.out.print(" now:"+now+"\n"); IrO +5w  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); M]ap:  
  lastExecuteTime=now; 9.Ap~Ay.  
  executeUpdate(); Kx]> fHK  
 } A +!sD5d  
 else{ +sn2Lw!^  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); <:cpz* G4  
 } Iu6W=A  
} +L6" vkz  
} rdI]\UH  
//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 ^-L{/'[8M  
rsSue_Q  
  类写好了,下面是在JSP中如下调用。 6:RMU  
|e"/Mf[  
<% OWV/kz5'H  
CountBean cb=new CountBean(); +v1-.z  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); @W [{2d  
CountCache.add(cb); i_YW;x  
out.print(CountCache.list.size()+"<br>"); }vsO^4Sjc  
CountControl c=new CountControl(); /W9 &Ke  
c.run(); 4I.1D2 1jA  
out.print(CountCache.list.size()+"<br>");  oWrE2U;  
%>
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