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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: gH55c aF<  
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  CountBean.java m_I$"ge  
vK7,O%!S  
/* ^J~4~!  
* CountData.java m$qC 8z]  
* ?JTyNg4<  
* Created on 2007年1月1日, 下午4:44 >d V@9  
* Vzm+Ew _  
* To change this template, choose Tools | Options and locate the template under h`rjDd  
* the Source Creation and Management node. Right-click the template and choose W&f Py%g  
* Open. You can then make changes to the template in the Source Editor. R:^?6f<Z}  
*/ +p<R'/  
=>%%]0  
  package com.tot.count; tsVhPo]e0  
:!!`!*!JH  
/** >:E-^t%  
* Ic!83-  
* @author 2]*~1d  
*/ ;rAW3  
public class CountBean { 2Lgvy/uN  
 private String countType; n<&R"89  
 int countId; &+^ Y>Ke  
 /** Creates a new instance of CountData */ <qY>d,+E'  
 public CountBean() {} EXzNehO~e  
 public void setCountType(String countTypes){ Qnx92   
  this.countType=countTypes; o xu9v/  
 } 6WcbJ_"mq  
 public void setCountId(int countIds){ Qs X59d  
  this.countId=countIds; ;*H~Yb0  
 } )'|W[Sh?  
 public String getCountType(){ nqJV1h  
  return countType; bXLa~r4\  
 } Ayt!a+J  
 public int getCountId(){ F <Z=%M3e  
  return countId; ',7Z1O  
 } ,)G+h#Y[*  
} q\Kdu5x{  
=8_TOvSJ4p  
  CountCache.java vqZM89 xY  
31Mc<4zI8  
/* ]3jH^7[?  
* CountCache.java TFPq(i  
* %k)I =|  
* Created on 2007年1月1日, 下午5:01 XQ;d ew+  
* pT$AdvI]  
* To change this template, choose Tools | Options and locate the template under &uW.V+3  
* the Source Creation and Management node. Right-click the template and choose # |[@Due  
* Open. You can then make changes to the template in the Source Editor. $0 zL  
*/ |T&#"q,i9%  
Lb 4!N` l  
package com.tot.count; P"@^'yR5WK  
import java.util.*; S`@*zQ  
/** a Z, Wa-k  
* N6%q%7F.:  
* @author 4 jro4B`  
*/ )E2Lf ]  
public class CountCache { &2pM3re/f  
 public static LinkedList list=new LinkedList(); /*HSAjv  
 /** Creates a new instance of CountCache */ H9!*DA<W  
 public CountCache() {} boovCW  
 public static void add(CountBean cb){ S @($c'  
  if(cb!=null){ yo6IY  
   list.add(cb); 7}.(EZ0  
  } YWFHiB7x  
 } 7z&u92dJI  
} `"Pd$jW  
"ZW*O{  
 CountControl.java )\G#[Pc7  
t]%R4ymV  
 /* vb!KuI!:p  
 * CountThread.java E#p6A5  
 * o!S_j^p[C  
 * Created on 2007年1月1日, 下午4:57 _nq n|  
 * }cmL{S  
 * To change this template, choose Tools | Options and locate the template under ,DLNI0uV  
 * the Source Creation and Management node. Right-click the template and choose ')RK(I  
 * Open. You can then make changes to the template in the Source Editor. 8;3FTF  
 */ ^o:5B%}#[  
SoIMftX  
package com.tot.count; +?tNly`  
import tot.db.DBUtils; <{kj}nxz  
import java.sql.*; J1t?Qj;f3  
/** *n5g";k|  
* `<G+ N  
* @author 2eYkWHi  
*/ ~VF,qspO  
public class CountControl{ wE2?/wb  
 private static long lastExecuteTime=0;//上次更新时间  ,fFJSY^  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 z[OEg HI  
 /** Creates a new instance of CountThread */ e(A&VIp  
 public CountControl() {} Mla,"~4D5  
 public synchronized void executeUpdate(){ H5)WxsZ R  
  Connection conn=null; PeaD]  
  PreparedStatement ps=null; ~<LI p%5(  
  try{ n1h+`nsf  
   conn = DBUtils.getConnection(); rD?o97  
   conn.setAutoCommit(false); ]A[~2]  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); C?k4<B7V  
   for(int i=0;i<CountCache.list.size();i++){ m^KkS   
    CountBean cb=(CountBean)CountCache.list.getFirst(); ?zqXHv#x  
    CountCache.list.removeFirst(); Gr?gHAT  
    ps.setInt(1, cb.getCountId()); P6rL;_~e  
    ps.executeUpdate();⑴ S)?B  I  
    //ps.addBatch();⑵ m`aUz}Y>c  
   } JG4I-\+H  
   //int [] counts = ps.executeBatch();⑶ F!8425oAw  
   conn.commit(); -xlI'gNg7  
  }catch(Exception e){ %## bg<  
   e.printStackTrace(); b-XBs7OAx  
  } finally{ FliN@RNo  
  try{ bfgLU.1I  
   if(ps!=null) { 9UX-)!  
    ps.clearParameters(); 5E}i<}sq5  
ps.close(); 5/<Y,eZ/  
ps=null; ga1RMRu+  
  } B}.ia_&DLR  
 }catch(SQLException e){} HAXx`r<  
 DBUtils.closeConnection(conn); [gDvAtTZ5  
 } wqsnyP/m  
} WJWhx4Hk  
public long getLast(){ V-57BKeDz  
 return lastExecuteTime; ( ;q$cKy  
} 4"@yGXUb  
public void run(){ IU/*YI%W  
 long now = System.currentTimeMillis(); NDi@x"];  
 if ((now - lastExecuteTime) > executeSep) { S5vJC-"  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); 89l}6p/L  
  //System.out.print(" now:"+now+"\n"); 3%k+<ho(  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); N?p $-{  
  lastExecuteTime=now; )erPp@  
  executeUpdate(); h2 y@xnn  
 } UHHe~L  
 else{ JdnZY.{S0  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); qabM@+m[  
 } $!t!=  
} =Ur/v'm  
} ~W4<M:R  
//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 q4E{?  
-z@}:N-uR  
  类写好了,下面是在JSP中如下调用。 <GC:aG  
#cA}B L!3  
<% 4Y'qo M;  
CountBean cb=new CountBean(); @: NrC76  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); aOOY_S E  
CountCache.add(cb); aG!!z>  
out.print(CountCache.list.size()+"<br>"); ^?,/_3  
CountControl c=new CountControl(); k5 8lmuU  
c.run(); Wo%&,>]<H  
out.print(CountCache.list.size()+"<br>"); 5m/r,d^H  
%>
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