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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: pYQSn.`V~  
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  CountBean.java +@?Q"B5u}  
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/* dP_Q kO  
* CountData.java >hNSEWMY`  
* 1ARtFR2C{b  
* Created on 2007年1月1日, 下午4:44 }{N#JTmjB#  
* 'O)v@p "  
* To change this template, choose Tools | Options and locate the template under <@(\z   
* the Source Creation and Management node. Right-click the template and choose >u> E !5O  
* Open. You can then make changes to the template in the Source Editor. xF!IT"5D  
*/ wA$7SWC  
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  package com.tot.count; ]Ik~TW&  
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/** %U{sn\V  
* P_3IFHe  
* @author VYb,Hmm>kC  
*/ N9M}H#  
public class CountBean { TNqL ')f  
 private String countType; 4j3_OUwWZx  
 int countId; 5go)D+6s  
 /** Creates a new instance of CountData */ I[&x-}w  
 public CountBean() {} 8(4!x$,Z5  
 public void setCountType(String countTypes){ .5; JnJI  
  this.countType=countTypes; Pr} l y  
 } =? !FO'zt"  
 public void setCountId(int countIds){ (E0WZ $f}  
  this.countId=countIds; )q_,V"  
 } $V 3If  
 public String getCountType(){ L?nhm=D  
  return countType; esTL3 l{[  
 } t#P7'9Se8  
 public int getCountId(){ C '[4jz0xF  
  return countId; {2q"9Ox"  
 } [!%5(Ro_  
} &'12,'8  
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  CountCache.java Zuzwc[Z1  
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/* (nLzWvN  
* CountCache.java xMk>r1Ud  
* c\ZI 5&4jT  
* Created on 2007年1月1日, 下午5:01 [,Rc&7p~R  
* 1sg:8AA  
* To change this template, choose Tools | Options and locate the template under wp}Q4I  
* the Source Creation and Management node. Right-click the template and choose ys[xR=nbD  
* Open. You can then make changes to the template in the Source Editor. ]mtiIu[  
*/ QaO9-:]eN  
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package com.tot.count; u|wl;+.  
import java.util.*; $Mg O)bH  
/** MRz f#o<H  
* I@m(}  
* @author G_=i#Tu[  
*/ AAfU]4u0S  
public class CountCache { |e#W;q$v  
 public static LinkedList list=new LinkedList(); vX>{1`e{S  
 /** Creates a new instance of CountCache */ EFDmNud`Q  
 public CountCache() {} [@qjy*5p  
 public static void add(CountBean cb){ @:w^j0+h  
  if(cb!=null){ -`5]%.E&8  
   list.add(cb); xT&/xZLT  
  } [gUD +  
 } rOLZiET  
} vW.f`J,\D'  
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 CountControl.java 4PD5i  
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 /* w|G7h=  
 * CountThread.java fPTLPcPP  
 * ih)\P0wed  
 * Created on 2007年1月1日, 下午4:57 >{Ayzz>v  
 * XS2/U<s d  
 * To change this template, choose Tools | Options and locate the template under }0<2n~3P  
 * the Source Creation and Management node. Right-click the template and choose =C$"e4%Be  
 * Open. You can then make changes to the template in the Source Editor. pvsY 0a@4  
 */ =4+2y '  
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package com.tot.count; +(x(Ybl#  
import tot.db.DBUtils; \h[*oeh  
import java.sql.*; i;~.kgtq4  
/** :-59~8&  
* W"s/ 8;  
* @author 5+{oQs_  
*/ 5xKod0bA  
public class CountControl{ pFMJG<W9,  
 private static long lastExecuteTime=0;//上次更新时间  Il\{m?Y  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 |a])o  
 /** Creates a new instance of CountThread */ O=}  
 public CountControl() {} yT<"?S>D  
 public synchronized void executeUpdate(){ n'vdA !R  
  Connection conn=null; GBZu<t/  
  PreparedStatement ps=null; m==DBh  
  try{ z+oy#p6+F.  
   conn = DBUtils.getConnection(); 7~"eT9W V  
   conn.setAutoCommit(false); *lZ V3F  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); rgXX,+cO  
   for(int i=0;i<CountCache.list.size();i++){ q}jh>`d  
    CountBean cb=(CountBean)CountCache.list.getFirst(); V&j]*)  
    CountCache.list.removeFirst(); VXk[p  
    ps.setInt(1, cb.getCountId()); lrkgsv6  
    ps.executeUpdate();⑴ ]srL>29_b  
    //ps.addBatch();⑵ 0ie)$fi  
   } Vq#0MY)2gS  
   //int [] counts = ps.executeBatch();⑶ a"4X7 D+  
   conn.commit(); g'km*EV  
  }catch(Exception e){ jp_)NC/~g  
   e.printStackTrace(); bRFZ:hu l  
  } finally{ ~~WY?I-  
  try{ |Z>}#R!,P  
   if(ps!=null) { 1:7 fV@jw  
    ps.clearParameters(); PY4">~6\i  
ps.close(); lhE]KdE3  
ps=null; "}0QxogYE  
  } l(QntP  
 }catch(SQLException e){} (i{ZxWW&  
 DBUtils.closeConnection(conn); WUYU\J&q3  
 } PU\xFt  
} 3r^||(_u  
public long getLast(){ ' "%hX&]5  
 return lastExecuteTime; +#>nOn(B  
} 6Yva4Lv  
public void run(){ $5ea[n c  
 long now = System.currentTimeMillis(); jN= !Q&^i[  
 if ((now - lastExecuteTime) > executeSep) { {LKW%G7  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); GRj [2I7:  
  //System.out.print(" now:"+now+"\n"); ]n1#8T&<*z  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 3&[d.,/  
  lastExecuteTime=now; _W Hi<,-  
  executeUpdate(); +Y+fM  
 } 0%rE*h9+  
 else{ 9. FXbNYg  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Mf5*Wjz.Mc  
 } 4Af7x6a;  
} 7/]Ra  
} }`0=\cKqn  
//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 k;Qm%B  
b:O_PS5h  
  类写好了,下面是在JSP中如下调用。 \qW^AD(it<  
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<% 5 <KBMCn  
CountBean cb=new CountBean(); b H5lLcdf  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); B|^=2 >8s  
CountCache.add(cb); Sd I>  
out.print(CountCache.list.size()+"<br>"); {O=_c|u{N  
CountControl c=new CountControl(); hE\gXb  
c.run(); (3x2^M8  
out.print(CountCache.list.size()+"<br>"); Cvt/ot-J?  
%>
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