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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: l<S3<'&  
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  CountBean.java fwzyCbks  
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/* =F/R*5:T  
* CountData.java H>]*<2(=-  
* x N>\t& c  
* Created on 2007年1月1日, 下午4:44 n4XkhY|  
* s-x1<+E(  
* To change this template, choose Tools | Options and locate the template under -H[@]Q4w  
* the Source Creation and Management node. Right-click the template and choose 9PO5GYU  
* Open. You can then make changes to the template in the Source Editor. 4XJ']M(5;  
*/ G\k&s F  
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  package com.tot.count; Td7Q%7p:  
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/** 7T!t*sSO'  
* eW3?3l`fvt  
* @author #_3-(H5u  
*/ Vi'7m3&  
public class CountBean { uV}GUE%W  
 private String countType; eej#14 &  
 int countId; asp\4-?$o  
 /** Creates a new instance of CountData */ e(1{W P  
 public CountBean() {} ;BWWafZ  
 public void setCountType(String countTypes){ }lJ|nl`c  
  this.countType=countTypes; eDNY|}$}v  
 } HJ"sK5Q  
 public void setCountId(int countIds){ D(TfW   
  this.countId=countIds; AOL=;z9c#  
 } >nK (  
 public String getCountType(){ RASk=B  
  return countType; MOB'rPIUI  
 } }y+a )2  
 public int getCountId(){ OzRo  
  return countId; w+!V,lU"^  
 } :l Z\=2D  
} 8/,s 8u  
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  CountCache.java \fUVWXv  
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/* ga;t`5+d  
* CountCache.java F60m]NUM)c  
* 7pep\  
* Created on 2007年1月1日, 下午5:01 }PDtx:T-  
* AtAu$"ue  
* To change this template, choose Tools | Options and locate the template under 6*>vie  
* the Source Creation and Management node. Right-click the template and choose q %tq9%  
* Open. You can then make changes to the template in the Source Editor. i{Q,>Rt  
*/ juM~X5b  
?G&J_L=@Y  
package com.tot.count; Dp^=%F{t  
import java.util.*; ~:_10g]r  
/** TDg<&ND3  
* XC/M:2$  
* @author 56NDU>j$  
*/ 7s:cg  
public class CountCache { 2AxKB+c1`  
 public static LinkedList list=new LinkedList(); a~-k} G5  
 /** Creates a new instance of CountCache */ %^"i\- *|S  
 public CountCache() {} 4m~p(r  
 public static void add(CountBean cb){ kqC7^x  
  if(cb!=null){ 2U+Fa t@  
   list.add(cb); 'q8:1i9\[  
  } %/s+-j@s:  
 } 0.(7R,-  
} _R ;$tG,  
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 CountControl.java ^fS_h `B  
biQ~q $E  
 /* nvodP"iV  
 * CountThread.java iZ ;562Mo  
 * w>RwEU+w=@  
 * Created on 2007年1月1日, 下午4:57 Gh%dVP9B@P  
 * ._'.F'd  
 * To change this template, choose Tools | Options and locate the template under ~"R;p}5 "  
 * the Source Creation and Management node. Right-click the template and choose ukD:4s v  
 * Open. You can then make changes to the template in the Source Editor. 2Aa  
 */ kCoEdQ_  
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package com.tot.count; 8D^ iQBA  
import tot.db.DBUtils; |hu9)0 P  
import java.sql.*; F22]4DLHO  
/** +~lPf.  
* "#%9dWy  
* @author k>\s6  
*/ 6?0QzSpfC#  
public class CountControl{ (|y@ ftr@  
 private static long lastExecuteTime=0;//上次更新时间  `n e9&+  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 /9-kG  
 /** Creates a new instance of CountThread */ DPl&e-`  
 public CountControl() {} _]+ \ B  
 public synchronized void executeUpdate(){ }.<]A  
  Connection conn=null; s8r[U, }(  
  PreparedStatement ps=null; }\ya6Gi8  
  try{ N&Uqzt*  
   conn = DBUtils.getConnection(); 5VLC\QgK^  
   conn.setAutoCommit(false); bGp3 V. H  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7zXX& S  
   for(int i=0;i<CountCache.list.size();i++){ h~&5;  
    CountBean cb=(CountBean)CountCache.list.getFirst(); DwXSlsN3v  
    CountCache.list.removeFirst(); U4._a  
    ps.setInt(1, cb.getCountId()); DpL|aRdbK  
    ps.executeUpdate();⑴ "j}fcrlG9  
    //ps.addBatch();⑵ Bjb8#n04  
   } BUla2p  
   //int [] counts = ps.executeBatch();⑶ *{e,< DV  
   conn.commit(); :YmFQ>e?  
  }catch(Exception e){ 9NC'iFQ#  
   e.printStackTrace(); E I&)+cC  
  } finally{ l9NET  
  try{ ^JB5-EtL(  
   if(ps!=null) { @c%h fI  
    ps.clearParameters(); TaTw,K|/  
ps.close(); O-<nL B!Wf  
ps=null; lhFv2.qR  
  } ~NwX,-ri  
 }catch(SQLException e){} )TkXdA?.  
 DBUtils.closeConnection(conn); 82=>I*0Q  
 } mH4Jl1S&  
} yd`f<Hr<m  
public long getLast(){ 'c/Z W  
 return lastExecuteTime; {,o =K4CD  
} 2&:w_KJ  
public void run(){ E uk[ @1  
 long now = System.currentTimeMillis(); k'1i quc#u  
 if ((now - lastExecuteTime) > executeSep) { SA -r61  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); G:|=d0  
  //System.out.print(" now:"+now+"\n"); D{, b|4  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Z%Yq{tAt  
  lastExecuteTime=now; e?XQ,  
  executeUpdate(); Hl*/s  
 } Z<[f81hE&  
 else{ $4rMYEn08  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /m*+N9)  
 } Z E},x U%  
} Q-$EBNz  
} f`,isy[  
//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 xz vbjS W  
vA@\V)s  
  类写好了,下面是在JSP中如下调用。 EY.Z.gMZI(  
@ u2 P&|:{  
<% #,\qjY  
CountBean cb=new CountBean(); c_.4~>qw  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); w 8oIq*  
CountCache.add(cb); &^b mZj!  
out.print(CountCache.list.size()+"<br>"); <a$'tw-8  
CountControl c=new CountControl(); B pl(s+  
c.run(); (n~GKcA  
out.print(CountCache.list.size()+"<br>"); J~1 =?</  
%>
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