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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: g>m)|o'  
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  CountBean.java 3D"2yTM(  
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/* Rqi= AQ  
* CountData.java 1G0U}-6RH  
* MX@t[{Gg9  
* Created on 2007年1月1日, 下午4:44 x)Y?kVw21"  
* Wchu-]  
* To change this template, choose Tools | Options and locate the template under toq/G,N Q  
* the Source Creation and Management node. Right-click the template and choose @H{QHi  
* Open. You can then make changes to the template in the Source Editor. NUlp4i~Q  
*/ D5o[z:V7"  
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  package com.tot.count; VH.m H<  
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/** :bh#,]'  
* 'jw?XtG  
* @author uwQ~4   
*/ ^#|Sl D]  
public class CountBean { Fgx{ s%&-  
 private String countType; {|KFgQ'\  
 int countId; |WiE`&?xP  
 /** Creates a new instance of CountData */ Mnu8d:$  
 public CountBean() {} N~""Lc&  
 public void setCountType(String countTypes){ <G};`}$a  
  this.countType=countTypes; }V:B,:  
 } Nl4,c[$C  
 public void setCountId(int countIds){ }McqoZ%F  
  this.countId=countIds; 0}'xoYv f  
 } _d|CO  
 public String getCountType(){ IhIz 7.|  
  return countType; xRX2u_f$<  
 } 1zGD~[M  
 public int getCountId(){ ~.Wlv;  
  return countId; Su]@~^w  
 } og`rsl  
} :w!A_~ w2  
ww}4   
  CountCache.java L;7u0Yg  
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/* ~+A(zlYr~  
* CountCache.java 5NR@<FE  
* 8l1s]K qr  
* Created on 2007年1月1日, 下午5:01 GM~Ek] 9C%  
* w4nU86oZYl  
* To change this template, choose Tools | Options and locate the template under _VUG!?_D$5  
* the Source Creation and Management node. Right-click the template and choose ?XlPK Y  
* Open. You can then make changes to the template in the Source Editor. W\c1QY$E  
*/ -wsoJh  
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package com.tot.count; khc1<BBsT  
import java.util.*; >\7M f@c  
/** V&h{a8xa$  
* E/3i _R  
* @author VMee"'08  
*/ 2q NA\-0i>  
public class CountCache { [.(,v n?6  
 public static LinkedList list=new LinkedList(); 33=lR-N#  
 /** Creates a new instance of CountCache */ EV'i/*v}\  
 public CountCache() {} w;{=  
 public static void add(CountBean cb){ k-Z :z?M  
  if(cb!=null){ f7SMO-3a  
   list.add(cb); w+wg)$i  
  } l(y,lK=YP1  
 } 1K UM!DUD  
} V0<g$,W=  
3;O4o]`  
 CountControl.java ;e"dxAUe!^  
Tc.QzD\  
 /* 0H +!v  
 * CountThread.java :#VdFMC<  
 * >T#" Im-  
 * Created on 2007年1月1日, 下午4:57 !X[P)/?b0+  
 * ,Y4>$:#n/  
 * To change this template, choose Tools | Options and locate the template under &7 K=  
 * the Source Creation and Management node. Right-click the template and choose d=p=eUd2  
 * Open. You can then make changes to the template in the Source Editor. Nz77" kC  
 */ E !9(6G4  
)H>?K0I  
package com.tot.count; Kqz+:E8D  
import tot.db.DBUtils; @<jm+f"MP  
import java.sql.*; j"A<qI  
/** rJT YCe1*  
* GBl[s,g[|  
* @author :jf/$]p  
*/  Zsn@O2  
public class CountControl{ |ms.  
 private static long lastExecuteTime=0;//上次更新时间  lhC^Upqw  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 G J{XlH  
 /** Creates a new instance of CountThread */ I&6M{,rnM  
 public CountControl() {} B k*Rz4Oa  
 public synchronized void executeUpdate(){ VaW^;d#  
  Connection conn=null; %Z3B9  
  PreparedStatement ps=null; Sy/Z}H  
  try{ *3KSOcQ  
   conn = DBUtils.getConnection(); =fy\W=c  
   conn.setAutoCommit(false); OQIr"  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Zq~Rkx  
   for(int i=0;i<CountCache.list.size();i++){ ;Nw)zS  
    CountBean cb=(CountBean)CountCache.list.getFirst(); HUChg{[  
    CountCache.list.removeFirst(); <L('RgA@X  
    ps.setInt(1, cb.getCountId()); ' GUCXx  
    ps.executeUpdate();⑴ v5 @9  
    //ps.addBatch();⑵ BM{*5Lf  
   } >m:n6M'r  
   //int [] counts = ps.executeBatch();⑶ 8 (ot<3(D  
   conn.commit(); 6M ;lD5(>  
  }catch(Exception e){ ?t/G@  
   e.printStackTrace(); `TYC]9  
  } finally{ ~"\WV4}`v  
  try{ #~m 8zG  
   if(ps!=null) { |)C #  
    ps.clearParameters(); e"%uOuIYX  
ps.close(); oj[~H}>  
ps=null; kL F~^/  
  } lbX YWZ~7  
 }catch(SQLException e){} Lq62  
 DBUtils.closeConnection(conn); 1cc~UQ  
 } id9XwWV  
} >,QCKZH  
public long getLast(){ }H<Z`3_U%  
 return lastExecuteTime; '1rGsfp6In  
} E4'z  
public void run(){ (< >Lfn  
 long now = System.currentTimeMillis(); L]%!YP\<T  
 if ((now - lastExecuteTime) > executeSep) { ORM3o ucP  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); ~"_!O+Pj  
  //System.out.print(" now:"+now+"\n"); +\*b?x  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n");  LJ;&02w@  
  lastExecuteTime=now; _#1EbvO*l  
  executeUpdate();  gnkeJ}K  
 } /i dI-  
 else{ eso-{W,D  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ,zuS)?  
 } "TP~TjXfq  
} g!.piG|  
} C>'G?  
//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 +p`BoF9~  
q{_f"  
  类写好了,下面是在JSP中如下调用。 C4qK52'2s  
&Nh zEl1  
<% k ~Q 5Cs  
CountBean cb=new CountBean(); F3K<-JK+  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `zrg?  
CountCache.add(cb); aOw#]pB|  
out.print(CountCache.list.size()+"<br>"); rT=C/SKP  
CountControl c=new CountControl(); lo1bj*Y2  
c.run(); EP"Z58&$R  
out.print(CountCache.list.size()+"<br>"); op/_ :#&'  
%>
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