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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: mhVoz0%1X  
t~a$|( 9  
  CountBean.java .y0]( h  
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/* fgp 7 |;Y  
* CountData.java qA~D*=  
* I+CQ,Zuf  
* Created on 2007年1月1日, 下午4:44 XeB>V.<y  
* A5`7o9  
* To change this template, choose Tools | Options and locate the template under <eh(~  
* the Source Creation and Management node. Right-click the template and choose xXx`a\i  
* Open. You can then make changes to the template in the Source Editor. 8;!Eqyt  
*/ jo(Q`oxm!>  
!}P FiT^  
  package com.tot.count; GY",AL8f  
( Lu.^  
/** >C-_Zv<!T\  
* c==Oio("  
* @author jF3!}*7,  
*/ 8x9kF]=  
public class CountBean { "{B ek<  
 private String countType; o5D"<-=>  
 int countId; H4m6H)KOG  
 /** Creates a new instance of CountData */ 23f[i<4e  
 public CountBean() {} PPqTmx5S  
 public void setCountType(String countTypes){ X<m%EXvV  
  this.countType=countTypes; xk*3,J6BK  
 } <?zTnue  
 public void setCountId(int countIds){ h/fCCfO,  
  this.countId=countIds; kr*c?^b  
 } #w*pWD^  
 public String getCountType(){ lQsQRp  
  return countType; {.lF~cOu  
 } E&>,B81  
 public int getCountId(){ ommKf[h%i  
  return countId; !U#++Zig%  
 } x7@WWFF>  
} YEQW:r_h.S  
&CL|q+-  
  CountCache.java osd^SnL1/5  
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/* _M&.kha  
* CountCache.java ob] lCX)  
* ii;WmE&  
* Created on 2007年1月1日, 下午5:01 g& "(- :  
* |x6mkSf]ke  
* To change this template, choose Tools | Options and locate the template under ]v{fFmL  
* the Source Creation and Management node. Right-click the template and choose NVj J/  
* Open. You can then make changes to the template in the Source Editor. }m9LyT=~$  
*/ ;/V@N |$n  
~^^ey17   
package com.tot.count; N-rm k  
import java.util.*; )RYnRC#O  
/** Z0=m:h  
* L, {rMLM%  
* @author Y/S3)o  
*/ 2*citB{  
public class CountCache { $CmX &%L=  
 public static LinkedList list=new LinkedList(); vaj66nV  
 /** Creates a new instance of CountCache */ IPO[J^#Me  
 public CountCache() {}  4 Z}bw#  
 public static void add(CountBean cb){ VDTY<= Q  
  if(cb!=null){ hf<$vRti>  
   list.add(cb); 8`G{1lr4o  
  } &Bn; Vi  
 } MA+-2pMc|7  
} ^-IsK#r.k  
^2r}_ AX  
 CountControl.java kppRQ Q*[  
+?iM$}8!U  
 /* <s-@!8*(  
 * CountThread.java ?*'$(}r3  
 * ,8I AhQa  
 * Created on 2007年1月1日, 下午4:57 w`}9/s;$  
 * ~RXpz-Ye  
 * To change this template, choose Tools | Options and locate the template under 'Y[A'.*}4  
 * the Source Creation and Management node. Right-click the template and choose p? ?/r  
 * Open. You can then make changes to the template in the Source Editor. O|Ic[XfLx  
 */ C|f7L>qe  
"rGOw'!q>  
package com.tot.count; y<`?@(0$  
import tot.db.DBUtils; q.MVF]  
import java.sql.*; xD  
/** nuQ6X5>.=  
* $G_Q`w=jM  
* @author ,Us2UEWNv  
*/ >J}n@MZ  
public class CountControl{ -(w~LT$ "  
 private static long lastExecuteTime=0;//上次更新时间  A~nf#(!^]  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I &*_,d  
 /** Creates a new instance of CountThread */ YJxw 'U >P  
 public CountControl() {} :T3/yd62N  
 public synchronized void executeUpdate(){ #[MJ|^\i  
  Connection conn=null; dMx4ykrR  
  PreparedStatement ps=null; 4;`Bj:.  
  try{ j\RpO'+}  
   conn = DBUtils.getConnection(); Pag63njg?  
   conn.setAutoCommit(false); a'\By?V]  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ')S;[=v  
   for(int i=0;i<CountCache.list.size();i++){ R6 XuA(5  
    CountBean cb=(CountBean)CountCache.list.getFirst(); =rPrPb  
    CountCache.list.removeFirst(); Kt>X3m,  
    ps.setInt(1, cb.getCountId()); @&1Wy p  
    ps.executeUpdate();⑴ 9@ $,oM=  
    //ps.addBatch();⑵ N^VD=<#T  
   } zT~B 6  
   //int [] counts = ps.executeBatch();⑶ (wRBd  
   conn.commit(); =\)IaZ  
  }catch(Exception e){ /W#O +  
   e.printStackTrace(); 3>z[PPw  
  } finally{ ;evCW$G=  
  try{ 0e["]Tlnm  
   if(ps!=null) { l6[lJ0Y  
    ps.clearParameters(); ! 0/z>#b  
ps.close(); !~<siy  
ps=null; H]<]^Zmjy  
  } (UNtRz'=;  
 }catch(SQLException e){} B6Ej{q^k,  
 DBUtils.closeConnection(conn); ~fz[x9\  
 } $N$ FtpB  
} 1-I Swd'u  
public long getLast(){ *5%*|>  
 return lastExecuteTime; D}Ilyk_uUw  
} F="z]C;u  
public void run(){ V%HS\<$h  
 long now = System.currentTimeMillis();  'k&?DZ!  
 if ((now - lastExecuteTime) > executeSep) { gM;}#>6  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); x2|6   
  //System.out.print(" now:"+now+"\n"); P4 ul[zZ  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ,gnQa  
  lastExecuteTime=now; LE?u`i,e=+  
  executeUpdate(); !a1i Un9  
 } VS?@y/\In  
 else{ `29TY&p+"  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); '!v c/Hw  
 } LU!1s@  
} -'rj&x{Q)U  
} t0PQ~|H<KV  
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 fm1X1T.  
dw@E)  
  类写好了,下面是在JSP中如下调用。 ]8U ~Iy  
]0c Pml  
<% IKvBf'%-  
CountBean cb=new CountBean(); ^c9ThV.v  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); J."{<&  
CountCache.add(cb); fUag1d  
out.print(CountCache.list.size()+"<br>"); rlok%Rt4Z  
CountControl c=new CountControl(); }\v^+scD  
c.run(); 5IMSNGS  
out.print(CountCache.list.size()+"<br>"); VmQh$&h  
%>
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