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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: [{S;%Jj*X/  
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  CountBean.java CRZi;7`*1  
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/* B>~k).M&,  
* CountData.java awj+#^  
* "n{9- VEmN  
* Created on 2007年1月1日, 下午4:44 c;c:Ea5  
* P$p@5hl  
* To change this template, choose Tools | Options and locate the template under D^66p8t  
* the Source Creation and Management node. Right-click the template and choose 8_xnWMOe  
* Open. You can then make changes to the template in the Source Editor. Sk8%(JD7  
*/ -W|*fKN`3  
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  package com.tot.count; Z |2E b*  
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/** d^KBIz8$5l  
* ^G}# jg.  
* @author >Hdjsu5{N  
*/ KqN!?anPr  
public class CountBean { =ud `6{R  
 private String countType;  M*d-z  
 int countId; wXc,FD$  
 /** Creates a new instance of CountData */ ~?FK ; (  
 public CountBean() {} )-0[ra]  
 public void setCountType(String countTypes){ eQ$N:]  
  this.countType=countTypes; :fxWz%t  
 } >$2E1HW.  
 public void setCountId(int countIds){ |'ZN!2u  
  this.countId=countIds; X3P&"}a  
 } |n+ #1_t%  
 public String getCountType(){ |.1qy,|!X  
  return countType; )r ULT$;i@  
 } $GQphXb$  
 public int getCountId(){ .W!tveX8-  
  return countId; VVs{l\$=ZV  
 } n4^*h4J7  
} N1PECLS?  
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  CountCache.java {J{1`@  
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/* Oz :D.V 3~  
* CountCache.java <\h*Zy  
* 1+R:3(AC  
* Created on 2007年1月1日, 下午5:01 Gu2_dT  
* Y;8 >=0ye  
* To change this template, choose Tools | Options and locate the template under a]`itjL^  
* the Source Creation and Management node. Right-click the template and choose /Z:N8e  
* Open. You can then make changes to the template in the Source Editor. >Cvjs  
*/ llNXQlP\B  
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package com.tot.count; /v5qyR7an  
import java.util.*; GOGt?iw*<  
/** >&BrCu[u  
* y $:yz;  
* @author zEy&4Kl{+  
*/ _Aa[?2 O  
public class CountCache { iu +3,]7Fm  
 public static LinkedList list=new LinkedList(); 3a'q`.L  
 /** Creates a new instance of CountCache */ QO@6VY@  
 public CountCache() {}  for {  
 public static void add(CountBean cb){ u2 7S %2P  
  if(cb!=null){ 5Yl6?  
   list.add(cb); QW2?n`Fa9-  
  } |Td_S|:d  
 } n<E.Em1  
} q&Q/?g>f  
^b=XV&{q  
 CountControl.java ?gLAWz  
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 /* V7P6zAJy  
 * CountThread.java oB4#J*   
 * `Z:3` 7c  
 * Created on 2007年1月1日, 下午4:57 ;J'OakeVO  
 * c )03Ms4 D  
 * To change this template, choose Tools | Options and locate the template under z4g+2f7h-X  
 * the Source Creation and Management node. Right-click the template and choose eO'xkm  
 * Open. You can then make changes to the template in the Source Editor. )`<6taKx@n  
 */ }S,-uggz  
#'C/Gya  
package com.tot.count; c -w0  
import tot.db.DBUtils; 2\5cjdy  
import java.sql.*; n? ]f@OR  
/** sW?B7o?  
* 3EmcYC  
* @author or7pJy%4"  
*/ va^0JfQ  
public class CountControl{ z`OkHX*+2|  
 private static long lastExecuteTime=0;//上次更新时间  ZY)%U*jWU  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 mY`@'  
 /** Creates a new instance of CountThread */ 3q"7K  
 public CountControl() {} SBX|Bcyk*  
 public synchronized void executeUpdate(){ Yc d3QRB  
  Connection conn=null; rhIGOk1k  
  PreparedStatement ps=null; ;,dkJ7M  
  try{ iOll WkF  
   conn = DBUtils.getConnection(); Mm.Ql  
   conn.setAutoCommit(false); %]#VdS|N  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); V/+Jc( N  
   for(int i=0;i<CountCache.list.size();i++){ Evkt_vvf  
    CountBean cb=(CountBean)CountCache.list.getFirst(); PRwu  
    CountCache.list.removeFirst(); Q3,=~}ZNK  
    ps.setInt(1, cb.getCountId()); 8[M* x3  
    ps.executeUpdate();⑴ tn{8u7  
    //ps.addBatch();⑵ }'TTtV:Q  
   } =5Wp&SM6  
   //int [] counts = ps.executeBatch();⑶ |YRY!V_w  
   conn.commit(); 2A>C+Y[7\  
  }catch(Exception e){ fe';b[q)#  
   e.printStackTrace(); 3%2jwR  
  } finally{ SF^x=[ir  
  try{ .EG* +,  
   if(ps!=null) { SW#BZ3L  
    ps.clearParameters(); E+z18Lf?  
ps.close(); H*rx{F?  
ps=null; V!xwb:J  
  } k}zd' /b  
 }catch(SQLException e){} lbS?/f  
 DBUtils.closeConnection(conn); e />:K' {  
 } @zrNN>  
} GmbIFOT~  
public long getLast(){ # kEOKmO  
 return lastExecuteTime; [sj VRW-  
} G'9{a'  
public void run(){ /l6\^Xf{  
 long now = System.currentTimeMillis(); H|`R4hAk  
 if ((now - lastExecuteTime) > executeSep) { &bLC(e ]  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); ?q!FG(  
  //System.out.print(" now:"+now+"\n"); ~.6|dw\p!  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 7]s%r ya  
  lastExecuteTime=now; FsY(02  
  executeUpdate(); qg4fR' i  
 } V&[eSVY?  
 else{  U(~U!O}  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 4V$fGjJ3  
 } -`Q}tg>cT  
} AK*N  
} @KA1"Wb_  
//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 O:^'x*}  
l E^*t`+  
  类写好了,下面是在JSP中如下调用。 c#QFG1  
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<% JKy#j g:#  
CountBean cb=new CountBean(); ue6d~8&  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); $KX[Zu%  
CountCache.add(cb); EZib1g&:R/  
out.print(CountCache.list.size()+"<br>");  so fu  
CountControl c=new CountControl(); kaQ2A  
c.run(); 9tk" :ld  
out.print(CountCache.list.size()+"<br>"); 9!}q{2j  
%>
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