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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: X#Hl<d2  
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  CountBean.java /YHnt-}v,  
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/* BHt9$$Z|  
* CountData.java @#"6_{!j_X  
* BMb0Pu 8  
* Created on 2007年1月1日, 下午4:44 g}$B4_sY  
* *g"X hk  
* To change this template, choose Tools | Options and locate the template under oZ>2Tt%  
* the Source Creation and Management node. Right-click the template and choose Rw^X5ByJE  
* Open. You can then make changes to the template in the Source Editor. O% 8>siU  
*/ Lum5Va%0  
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  package com.tot.count; WHcw5_3#  
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/** W1ql[DqE{  
* 10CRgrZ  
* @author F#a'N c9  
*/ S|]\q-qA&  
public class CountBean { S3^(L   
 private String countType; |LirjC4  
 int countId; <=%=,Yk  
 /** Creates a new instance of CountData */  ?%*p!m  
 public CountBean() {} vF9fXY=  
 public void setCountType(String countTypes){ V^< Zs//7  
  this.countType=countTypes; \?vn0;R4  
 } !d&SVS^mo  
 public void setCountId(int countIds){ y>0Gmr  
  this.countId=countIds; GYtp%<<9;  
 } ?u>A2Vc!  
 public String getCountType(){ %*OQH?pyx}  
  return countType; 0zE(:K  
 } Iz8gZ:rd0  
 public int getCountId(){ ]v l?J  
  return countId; e17]{6y  
 }  NmTo/5s  
} ''}2JJU{  
vG~JK[  
  CountCache.java WNSEc%  
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/* o\X|\nUk  
* CountCache.java x{S2   
* ,zh_-2^X  
* Created on 2007年1月1日, 下午5:01 ;0-R"c)-  
* hbm #H7Y  
* To change this template, choose Tools | Options and locate the template under $pauPEe  
* the Source Creation and Management node. Right-click the template and choose (};/,t1#$  
* Open. You can then make changes to the template in the Source Editor. Qp+M5_  
*/ u<EPK*O*  
W4=A.2[q  
package com.tot.count; JhvT+"~  
import java.util.*; bycnh  
/** Zou;o9Ww  
* P>'29$1'  
* @author lQpl8>  
*/ 4xgfm.9I^  
public class CountCache { vw :&c.zd  
 public static LinkedList list=new LinkedList(); =l>=]O~h  
 /** Creates a new instance of CountCache */ VyWzb  
 public CountCache() {} #!t6'*  
 public static void add(CountBean cb){ {/i&o  
  if(cb!=null){ Y?:" nhN  
   list.add(cb); <MJ-w1A  
  } :A5h<=[  
 } .@psW0T%  
} lS?#(}a1)  
`:W}yo<F  
 CountControl.java 8Fv4\dr  
0a:@DOzT  
 /* ]>[ 0DX]j  
 * CountThread.java j+Q+.39s-~  
 * mp8Zb&Ggb  
 * Created on 2007年1月1日, 下午4:57 ~R~eQ=8  
 * ]3uj~la  
 * To change this template, choose Tools | Options and locate the template under $`<-;kI  
 * the Source Creation and Management node. Right-click the template and choose !*o{xq   
 * Open. You can then make changes to the template in the Source Editor. { }P~nP  
 */ uCc5)  
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package com.tot.count; YcW) D  
import tot.db.DBUtils; Z61L;E  
import java.sql.*; XV1XzG#C  
/** `Dp4Z>| K  
* .>p.k*vU  
* @author R#!Urhh  
*/ Xt!wO W  
public class CountControl{ `o21f{1]X&  
 private static long lastExecuteTime=0;//上次更新时间  )1f.=QZN^;  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 T-Yb|@4  
 /** Creates a new instance of CountThread */ ]j]<CqG  
 public CountControl() {} y 7z)lBy\  
 public synchronized void executeUpdate(){ %`lLX/4~  
  Connection conn=null; 2yVQqwQ m  
  PreparedStatement ps=null; (V0KmNCW`  
  try{ 9[h8Dy  
   conn = DBUtils.getConnection(); 6uxF<  
   conn.setAutoCommit(false); Zi<(>@z2  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); DuIgFp  
   for(int i=0;i<CountCache.list.size();i++){ ~|{_Go{ Q  
    CountBean cb=(CountBean)CountCache.list.getFirst(); py6O\` \  
    CountCache.list.removeFirst(); gps.  
    ps.setInt(1, cb.getCountId()); # ELYPp]6  
    ps.executeUpdate();⑴ l7 U<]i GL  
    //ps.addBatch();⑵ ps33&  
   } x^McUfdr|  
   //int [] counts = ps.executeBatch();⑶ ol}}c6  
   conn.commit(); zm#%]p80f  
  }catch(Exception e){ =KHX_ib  
   e.printStackTrace(); {Rn*)D9  
  } finally{ S$/SFB$)~W  
  try{ 60l!3o"p!  
   if(ps!=null) { {dlG3P='`f  
    ps.clearParameters(); q><wzCnRu~  
ps.close(); ;A0ZcgF  
ps=null; ={50>WXE  
  } P>Ru  
 }catch(SQLException e){} [d=BN ,?  
 DBUtils.closeConnection(conn); |}@teN^J*U  
 } qNUd "%S  
} VH] <o0  
public long getLast(){ 3?TUt{3g  
 return lastExecuteTime; JY%l1:}G3  
} t-Ble  
public void run(){ B/B`=%~5_^  
 long now = System.currentTimeMillis(); H %ScrJ#V  
 if ((now - lastExecuteTime) > executeSep) { Nx!7sE*b$1  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); ,My'_"S?  
  //System.out.print(" now:"+now+"\n"); CKX3t:HP0  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); d"S\j@  
  lastExecuteTime=now; _p<wATv?7t  
  executeUpdate(); SVPksr  
 } 7wHd*{^9N  
 else{ h~ q5GhY!9  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (]-RL A>  
 } ES)_X:\X?V  
} eWXR #g!%>  
} uCgJ F@  
//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 be [E^%  
>AWWwq -  
  类写好了,下面是在JSP中如下调用。 @*WrHoa2N  
<2wC)l3j*  
<% DIgur}q)@  
CountBean cb=new CountBean(); A(z m  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); QiaBZAol  
CountCache.add(cb); sHQO*[[  
out.print(CountCache.list.size()+"<br>"); 9TEAM<b;  
CountControl c=new CountControl(); J\Tu=f)  
c.run(); >^g\s]c[  
out.print(CountCache.list.size()+"<br>"); .-1'#Z1T  
%>
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