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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: H- aSLc  
} h pTS_  
  CountBean.java Y^W.gGM  
$s-HG[lX[  
/* \+B+M 7  
* CountData.java ]@MBE1M  
* C 9:5c@G  
* Created on 2007年1月1日, 下午4:44 e^ygQ<6%  
* s9-aPcA  
* To change this template, choose Tools | Options and locate the template under ;F!wyTF>}  
* the Source Creation and Management node. Right-click the template and choose 4TW>BA  
* Open. You can then make changes to the template in the Source Editor. AmmUoS\  
*/ 2K1odqO#   
K1K3s< y+  
  package com.tot.count; OCVF+D :  
E _DSf  
/** [J.-gN$X@  
* zS##YR  
* @author m;"i4!  
*/ =9ISsI\Y6  
public class CountBean { e+5]l>3)f  
 private String countType; K6Gri>Um  
 int countId; " )87GQ(R  
 /** Creates a new instance of CountData */ \f7A j>  
 public CountBean() {} g5*Zg_G/  
 public void setCountType(String countTypes){ M4:}`p=  
  this.countType=countTypes; V=,VOw4  
 } u.s-/ g  
 public void setCountId(int countIds){ $zvqjT:>  
  this.countId=countIds; <U ?_-0  
 } ]M;aVw<!  
 public String getCountType(){ tzeS D C  
  return countType; aN5w  
 } V:w=h>z8  
 public int getCountId(){ Iv5 agh%  
  return countId; mnM!^[|z  
 } C4jq T  
} ,mE*k79L6  
P`K?k<  
  CountCache.java AW+ q#Is  
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/* D<2|&xaR  
* CountCache.java .l->O-=  
* G=lket6  
* Created on 2007年1月1日, 下午5:01 6(`Bl$M9  
* z5G$'  
* To change this template, choose Tools | Options and locate the template under G3&l|@5  
* the Source Creation and Management node. Right-click the template and choose p/a)vN+*x'  
* Open. You can then make changes to the template in the Source Editor. B>CG/]  
*/ <d\Lvo[  
Y4 Y;xK"  
package com.tot.count; :u7y k@  
import java.util.*; {T]^C  
/** t9zF WdW  
* b'N(eka  
* @author 9cu0$P`}5  
*/ 4ISZyO=  
public class CountCache { Z~VSWrw3  
 public static LinkedList list=new LinkedList(); gt1W_C\  
 /** Creates a new instance of CountCache */ + W ? / A]  
 public CountCache() {} fr1/9E;  
 public static void add(CountBean cb){ OI9V'W$  
  if(cb!=null){ dX0"h5v1  
   list.add(cb); X=<-rFW  
  } :-=,([TJ  
 } os]P6TFFX?  
} o1"MW>B,4  
i$Q$y hT{  
 CountControl.java 2U-F}Z  
{ L(Q|bB  
 /* Q_bF^4gt  
 * CountThread.java Dwq}O  
 * RQZ|:SvV  
 * Created on 2007年1月1日, 下午4:57 F;mK)Q-  
 * ?2b*F Qe  
 * To change this template, choose Tools | Options and locate the template under HY,+;tf2r  
 * the Source Creation and Management node. Right-click the template and choose Q-X<zn  
 * Open. You can then make changes to the template in the Source Editor. S1<mO-  
 */ c8cV{}7Kb  
+@Oo)#V|.  
package com.tot.count; fXPD^}?Ux4  
import tot.db.DBUtils; a_UVb'z  
import java.sql.*; k:Iz>3O3]  
/** S0_#h)  
* ==[a7|q  
* @author $ePBw~yu  
*/ I$o^F/RH  
public class CountControl{ Gu-*@C:^&  
 private static long lastExecuteTime=0;//上次更新时间  &J)q_Z8  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &VIX?UngE  
 /** Creates a new instance of CountThread */ vpy_piG|  
 public CountControl() {} ydCVG,"  
 public synchronized void executeUpdate(){ R0R Xw  
  Connection conn=null; = dyApR:'  
  PreparedStatement ps=null; tp='PG.6  
  try{ +`_I !  
   conn = DBUtils.getConnection(); wL'tGAv  
   conn.setAutoCommit(false); qYHAXc}$  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ^rI<}cfR  
   for(int i=0;i<CountCache.list.size();i++){ .:KZ8'g3}  
    CountBean cb=(CountBean)CountCache.list.getFirst(); zW`$T 88~  
    CountCache.list.removeFirst(); YEZd8Y  
    ps.setInt(1, cb.getCountId()); Zc"Vf]:  
    ps.executeUpdate();⑴ :wJ=t/ho  
    //ps.addBatch();⑵ P< +5So0  
   } KWVEAHIn  
   //int [] counts = ps.executeBatch();⑶ [Yx)`e  
   conn.commit(); fI2/v<[  
  }catch(Exception e){ 0W|}5(C  
   e.printStackTrace(); &j\<UPn  
  } finally{ =#@eDm%  
  try{ bqwQi>^Cw  
   if(ps!=null) { -S]yXZ  
    ps.clearParameters(); [b: $sR;  
ps.close(); ~RV>V*l  
ps=null; } PD]e*z{Z  
  } "p43#  
 }catch(SQLException e){} IR(6  
 DBUtils.closeConnection(conn); o0Z(BTO  
 } +?[ ,y  
} a1;P2ikuK  
public long getLast(){ qc}r.'p  
 return lastExecuteTime; x&6SjlDb$K  
} &+?JY|u  
public void run(){ @(Mg>.P  
 long now = System.currentTimeMillis(); stDrF1{  
 if ((now - lastExecuteTime) > executeSep) { fUh7PF%  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); D"WqJcDt  
  //System.out.print(" now:"+now+"\n"); VJ` c/EVIt  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); z z@;UbD"  
  lastExecuteTime=now; 1]HEwTT/1_  
  executeUpdate(); [C PgfVz  
 } H[ 6L!  
 else{ tn-_3C  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); o2 =UUD&  
 } J`U\3:b`SP  
} X|'EyZ  
} P@ewr}  
//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 @add'>)  
Ju""i4  
  类写好了,下面是在JSP中如下调用。 {Mc^[}9  
:` >|N|i  
<% V[<]BOM\v  
CountBean cb=new CountBean(); <MgR x9  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 2%YtMkC5  
CountCache.add(cb); > uS?Nz5/  
out.print(CountCache.list.size()+"<br>"); bi:m;R  
CountControl c=new CountControl(); {EKzPr/  
c.run(); cd36f26`"w  
out.print(CountCache.list.size()+"<br>"); 0h~Iua5  
%>
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