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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: 2-9'zN0u  
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  CountBean.java $\xS~ w  
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/* HF9d~7R  
* CountData.java 0^VA,QkQ\  
* ^Tbw#x]2  
* Created on 2007年1月1日, 下午4:44 []D@"Bz  
* -v*wT*I1  
* To change this template, choose Tools | Options and locate the template under Y4Hi<JWo  
* the Source Creation and Management node. Right-click the template and choose )]"aa_20]  
* Open. You can then make changes to the template in the Source Editor. tl|Qw";I  
*/ /jdq7CF  
=FkU: q$  
  package com.tot.count; {c|=L@/  
] 8sVXZ  
/** P>/n!1c  
* k\UDZ)TQV  
* @author U$j*{`$4  
*/ *xxG@h|5n  
public class CountBean { <QGf9{m  
 private String countType; XOQj?Q7)U  
 int countId; u%FG% j?C  
 /** Creates a new instance of CountData */ c0v;r4Jo#j  
 public CountBean() {} FI1R7A  
 public void setCountType(String countTypes){ R=jIVw'  
  this.countType=countTypes; L Of0_g/  
 } xWX1P%`  
 public void setCountId(int countIds){ u|l]8T9L  
  this.countId=countIds; %xE\IRlR  
 } 0*S2_&Q)  
 public String getCountType(){ +@),Fk_  
  return countType; .l$'%AG:~  
 } ^J3\ U{B  
 public int getCountId(){ <^?64  
  return countId; HCHZB*r[  
 } ngM>Tzirt  
} nd(O;XBI  
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  CountCache.java V_JM@VN}Kk  
KN>U6=WN  
/* UTw f!  
* CountCache.java tmF->~|  
* juPW!u  
* Created on 2007年1月1日, 下午5:01 y>T:fu  
* b_xn80O  
* To change this template, choose Tools | Options and locate the template under {7!WtH;-  
* the Source Creation and Management node. Right-click the template and choose 1A;>@4iC0  
* Open. You can then make changes to the template in the Source Editor. ydOJ^Yty  
*/ 5/<?Y&x  
6T>e~<^  
package com.tot.count; >]?!c5=  
import java.util.*; a=*&OW  
/** F+r3~T%  
* cx?t C#t  
* @author "*O(3L.c-  
*/ JiL%1y9|  
public class CountCache { 6XPf0Gl  
 public static LinkedList list=new LinkedList(); B>, O@og  
 /** Creates a new instance of CountCache */ .JIn(  
 public CountCache() {} %lsk> V  
 public static void add(CountBean cb){ p`ai2`qC`  
  if(cb!=null){ J{"<Hgb  
   list.add(cb); ;C,D1_20Z  
  }  qOO2@c  
 } 2aiZ  
} 4 %do.D*  
l :\DC  
 CountControl.java ]i\C4*  
t>[K:[0U  
 /* z7X[$T$V  
 * CountThread.java M$j]VZ  
 * hawE2k0p(  
 * Created on 2007年1月1日, 下午4:57 (orO=gST-/  
 * cl s-x@ Kd  
 * To change this template, choose Tools | Options and locate the template under 5nL,sFd  
 * the Source Creation and Management node. Right-click the template and choose u`Kjs}F'  
 * Open. You can then make changes to the template in the Source Editor. 86(8p_&zC  
 */ n DLr17  
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package com.tot.count; }lzUl mRTe  
import tot.db.DBUtils; ts rcX  
import java.sql.*; TqURYnNd  
/** f(Jz*el S  
* 8':^tMd  
* @author :Z0m "  
*/ m}Z=m8  
public class CountControl{ 'Dl31w%:  
 private static long lastExecuteTime=0;//上次更新时间  j_2-  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Zr`pOUk!4  
 /** Creates a new instance of CountThread */ qF!oP  
 public CountControl() {} lc%2fVG-e  
 public synchronized void executeUpdate(){ @ %LrpD  
  Connection conn=null; ^VCgc>x;  
  PreparedStatement ps=null; u*/.   
  try{ (dl7+  
   conn = DBUtils.getConnection(); J)R;NYl  
   conn.setAutoCommit(false); zX+NhTTB  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");  #P8R  
   for(int i=0;i<CountCache.list.size();i++){ /DPD,bA  
    CountBean cb=(CountBean)CountCache.list.getFirst(); _G]f v'  
    CountCache.list.removeFirst(); 0zR4Kj7EE  
    ps.setInt(1, cb.getCountId()); 83io@*D  
    ps.executeUpdate();⑴ A8bDg:G1i  
    //ps.addBatch();⑵ Ra%" +=  
   } k.b->U  
   //int [] counts = ps.executeBatch();⑶ :sD/IM",},  
   conn.commit();  +z/_'DE  
  }catch(Exception e){ =<nx [J  
   e.printStackTrace(); |fYr*8rH  
  } finally{ Kts#e:k@  
  try{ dD _(MbTt  
   if(ps!=null) { G:TM k4  
    ps.clearParameters(); ,r<!30~f  
ps.close(); ZuV/!9qU  
ps=null; RL =  
  } 0"q^`@sZ  
 }catch(SQLException e){} 4RgEN!d?H  
 DBUtils.closeConnection(conn);  [o]^\a y  
 } s?h=%; T[  
} <[9{Lg*D  
public long getLast(){ rp*f)rJ  
 return lastExecuteTime; "o+E9'Dm  
} ")%)e;V3  
public void run(){ t;ZA}>/  
 long now = System.currentTimeMillis(); 2u0C ~s  
 if ((now - lastExecuteTime) > executeSep) { {<f_,Nlc  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); 7v9l+OX,6  
  //System.out.print(" now:"+now+"\n"); I7!+~uX  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); rdK=f<I]  
  lastExecuteTime=now; 0<3)K[m~H  
  executeUpdate(); :CH?,x^!@  
 } R0>GM`{  
 else{ >l|ao&z>bm  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); j*uc$hC"  
 } o[C,fh,$  
} KjK.Sv{N  
} O>P792)  
//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 i"eUacBz/-  
:_ _z?<?(  
  类写好了,下面是在JSP中如下调用。 q/I':a[1  
pwq a/Yi  
<% ,Jqi J?,4C  
CountBean cb=new CountBean(); "AH1)skB:  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]w2nVC 3  
CountCache.add(cb); TFrZ+CcWp2  
out.print(CountCache.list.size()+"<br>"); v;=F $3  
CountControl c=new CountControl(); ,{{e'S9cy  
c.run(); \UKr|[P  
out.print(CountCache.list.size()+"<br>"); /%W&zd=%#  
%>
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