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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: ^4NRmlb  
\GQRpJ#h1  
  CountBean.java pU'${Z~b  
)Ly ~\*  
/* D+BiclJ  
* CountData.java hnH<m7  
* dm]g:KWg  
* Created on 2007年1月1日, 下午4:44 mln4Vl(l2M  
* TspX7<6r  
* To change this template, choose Tools | Options and locate the template under v_Df+  
* the Source Creation and Management node. Right-click the template and choose 7VG*Wu  
* Open. You can then make changes to the template in the Source Editor. M$Bb,s  
*/ -#mN/  
j}d):3!  
  package com.tot.count; ^/$dSXKF  
t- TUP>_  
/** cvo+{u$s  
* tQRbNY#}Z  
* @author Z,/^lg c,  
*/ ,X1M!'  
public class CountBean { Lq ;~6  
 private String countType; jSM`bE+"  
 int countId; q,<l3rIn  
 /** Creates a new instance of CountData */ oV;sd5'LG  
 public CountBean() {} he/rt#  
 public void setCountType(String countTypes){ ,9}JPv4Z  
  this.countType=countTypes; $]Ix(7@W  
 } 0Ze&GK'Hf  
 public void setCountId(int countIds){ AZE%fOG<i  
  this.countId=countIds; 7w" !"W#  
 } H ?9Bo!  
 public String getCountType(){ !/tV}.*  
  return countType; ("PZ!z1m1  
 } aMGh$\Pg  
 public int getCountId(){ ULu@"  
  return countId; rp dv{CUp7  
 } SmD#hE[  
} =OtW!vx#R.  
p7Zeudmj  
  CountCache.java F):kF_ho  
%'h:G Bkd  
/* ,mvFeo;@f  
* CountCache.java B Tj1C  
* ?lgE9I]  
* Created on 2007年1月1日, 下午5:01 OmZZTeGg1s  
* x 9\{a  
* To change this template, choose Tools | Options and locate the template under Q?LzL(OioN  
* the Source Creation and Management node. Right-click the template and choose aM1WC 'c&)  
* Open. You can then make changes to the template in the Source Editor. >T*BEikC  
*/ eN|zD?ba&  
#K@!jh)y^  
package com.tot.count; ujE~#b}X  
import java.util.*; /O$~)2^h  
/** 2-qWR<E  
* +h/OQ]`/m  
* @author ".Q]FE@>  
*/ ;nbEV2Y<  
public class CountCache { G7,v:dlK   
 public static LinkedList list=new LinkedList(); I]5){Q" S  
 /** Creates a new instance of CountCache */  PBW_9&d  
 public CountCache() {} 9 ;vES^  
 public static void add(CountBean cb){ *L>usLh  
  if(cb!=null){ @ YWuWF  
   list.add(cb); )v+&l9D  
  } rfQs 7S;G  
 } RT'5i$q[  
} g(s}R ?  
"30=!k  
 CountControl.java 2uY:p=DxG9  
W^ask[46R  
 /* S\sy^Kt~4:  
 * CountThread.java xDekC~ Zq  
 * #z.\pd  
 * Created on 2007年1月1日, 下午4:57 rk ,64(  
 * +JD^5J,-NJ  
 * To change this template, choose Tools | Options and locate the template under {i3x\|  
 * the Source Creation and Management node. Right-click the template and choose v [x 5@$  
 * Open. You can then make changes to the template in the Source Editor. "FGgem%9  
 */ wT;;B=u}G  
=8p[ (<F=  
package com.tot.count; 1uA-!T*e>  
import tot.db.DBUtils; T}XJFV  
import java.sql.*; n Zx^ej\  
/** "4smW>f:%  
* PiR`4Tu  
* @author ci(BPnQ  
*/ jl]p e7-  
public class CountControl{ V)`Q0}  
 private static long lastExecuteTime=0;//上次更新时间  hdM?Uoo(4a  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 QiRx2Z*\  
 /** Creates a new instance of CountThread */ JL:B4 f%}B  
 public CountControl() {} Ai)Q(]  
 public synchronized void executeUpdate(){ ,<OS: ]  
  Connection conn=null; #&{)`+!"  
  PreparedStatement ps=null; #LwDs,J:  
  try{ !a'{gw  
   conn = DBUtils.getConnection(); hE2{m{^A  
   conn.setAutoCommit(false); T z+Y_  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =`gFwH<   
   for(int i=0;i<CountCache.list.size();i++){ V+*1?5w  
    CountBean cb=(CountBean)CountCache.list.getFirst(); 3i}$ ~rz]U  
    CountCache.list.removeFirst(); /h&>tYVio  
    ps.setInt(1, cb.getCountId()); uA%F0oM  
    ps.executeUpdate();⑴ tE=$#  
    //ps.addBatch();⑵ FW<YN;  
   } )[t3-'  
   //int [] counts = ps.executeBatch();⑶ ooYs0/,{  
   conn.commit(); `5~<)  
  }catch(Exception e){ R ta_\Aj!  
   e.printStackTrace(); VN@ZYSs  
  } finally{ U:IeMf-;  
  try{ xoE,3Sn  
   if(ps!=null) { =OA7$z[  
    ps.clearParameters(); cC,gd\}M  
ps.close(); _NbhWv  
ps=null; GlXzH1wZ  
  } YjG:ECj}  
 }catch(SQLException e){} sWLH"'Z  
 DBUtils.closeConnection(conn); Z:MU5(Te  
 } Yg`z4 U'6~  
} KH1/B_.\V  
public long getLast(){ _P]k6z+  
 return lastExecuteTime; GwlAEhP  
} h"Q&E'0d  
public void run(){ ds QGj&  
 long now = System.currentTimeMillis(); kI$X~s$r  
 if ((now - lastExecuteTime) > executeSep) { |<7nf75c}  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); \hZ9in`YlR  
  //System.out.print(" now:"+now+"\n"); Yr+ghl/ V  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); d4-cZw}+  
  lastExecuteTime=now; (KG>lTdN  
  executeUpdate(); 8,(5Q  
 } gMZ?MG  
 else{ ~7=w,+  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); qUp DmH  
 } v~HfA)#JK  
} P!2[#TL0  
} *,__\/U98  
//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 )kNyl@m  
l. i&.;f  
  类写好了,下面是在JSP中如下调用。 *YY:JLe  
#9Dixsl*Q  
<% F%QVn .  
CountBean cb=new CountBean(); X'>]z'0W  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); f_Q_qckB%x  
CountCache.add(cb); <:BhV82l  
out.print(CountCache.list.size()+"<br>"); G@QZmuj&KH  
CountControl c=new CountControl(); N;\by<snN  
c.run(); r@(hRl1k'  
out.print(CountCache.list.size()+"<br>"); "n@=.x  
%>
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