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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: j]bNOC2.L  
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  CountBean.java l"app]uVZ  
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/* Gf y9?sa  
* CountData.java h1jEulcMtq  
* m.2=,,r<Fq  
* Created on 2007年1月1日, 下午4:44 35 PIfq m  
* q_[V9  
* To change this template, choose Tools | Options and locate the template under _8'z"w F  
* the Source Creation and Management node. Right-click the template and choose ^b@&O-&s  
* Open. You can then make changes to the template in the Source Editor. wwVg'V;  
*/ "Iwd-#;$;  
2JX@#vQ4  
  package com.tot.count; UhVJ !NrT  
DfV'1s4y  
/** q"|#KT^)  
* jz"-E  
* @author 6;{E-y  
*/ [|{m/`8C  
public class CountBean { _5&LV2  
 private String countType; 9G=HG={  
 int countId; f5dctDHP  
 /** Creates a new instance of CountData */ F  uJ=]T  
 public CountBean() {} 0o &B 7N  
 public void setCountType(String countTypes){ :1,xse  
  this.countType=countTypes; Kb,#Ot  
 } ^{R.X:a  
 public void setCountId(int countIds){ Q3|I.I e  
  this.countId=countIds; ST7Xgma-  
 } MR-cOPn  
 public String getCountType(){ zPt0IB_j'  
  return countType; 0|D l/1  
 } #xTu {  
 public int getCountId(){ ?Y | *EH  
  return countId; A!.* eIV|  
 } VaLl$w  
} <Z^qBM  
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  CountCache.java 7R5!(g  
kV:C=MLI  
/* |?Bb{Es  
* CountCache.java #uillSV  
* 8jz[;.jP",  
* Created on 2007年1月1日, 下午5:01 \(a!U,]LM  
* CY i{WV(:  
* To change this template, choose Tools | Options and locate the template under ga+Z6|t  
* the Source Creation and Management node. Right-click the template and choose Qb~&a1&s#  
* Open. You can then make changes to the template in the Source Editor. h(H b+7g  
*/ +KKx\m*  
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package com.tot.count; ]`GDZw`  
import java.util.*; D>).^>|q  
/** Imm|5-qJ  
* yNk E>  
* @author z(dX<  
*/ 4C[n@ p2  
public class CountCache { "}'Sk(  
 public static LinkedList list=new LinkedList(); GYM6 `  
 /** Creates a new instance of CountCache */ 96.Vm*/7  
 public CountCache() {} AiE\PMF~{P  
 public static void add(CountBean cb){ <"rckPv_H  
  if(cb!=null){ # 5C)k5  
   list.add(cb); Qpaan  
  } P<GHX~nB  
 } V- HO_GDo  
} Vj{}cL"MR  
?B`Yq\L)  
 CountControl.java 0nOp'Ky\k  
ZUxlk+o9d  
 /* r GxX]  
 * CountThread.java </B5^}  
 * mbm|~UwD  
 * Created on 2007年1月1日, 下午4:57 jQ[M4)>_k`  
 * ezR!ngt  
 * To change this template, choose Tools | Options and locate the template under eg vgi?y  
 * the Source Creation and Management node. Right-click the template and choose B{+ Ra  
 * Open. You can then make changes to the template in the Source Editor. SXI3y  
 */ K9+C3"*I  
F6h|AF|"  
package com.tot.count; F9&ae*>,  
import tot.db.DBUtils; FTfejk!  
import java.sql.*; ,J0BG0jB^u  
/** dfoFs&CSKh  
* "p{cz(  
* @author z}[qk:  
*/ YN@ 4.&RP  
public class CountControl{ g~AO KHUP  
 private static long lastExecuteTime=0;//上次更新时间  0 w#[?.  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 w 9mi2=  
 /** Creates a new instance of CountThread */ A+Xk=k5<  
 public CountControl() {} bkgJz+u  
 public synchronized void executeUpdate(){ +Eh^j3W  
  Connection conn=null; xE4iey@\}  
  PreparedStatement ps=null; *Tt*\ O  
  try{ xX ktMlI  
   conn = DBUtils.getConnection(); 79svlq=  
   conn.setAutoCommit(false); 01nbR+e  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); bf3Njma%  
   for(int i=0;i<CountCache.list.size();i++){ 02~+$R]L  
    CountBean cb=(CountBean)CountCache.list.getFirst(); #*<*|AwoW|  
    CountCache.list.removeFirst(); ?5<Q+ G0r  
    ps.setInt(1, cb.getCountId()); =+qtk(p  
    ps.executeUpdate();⑴ u0@i3Po  
    //ps.addBatch();⑵ t TAql n|  
   } a3<.F&c+c  
   //int [] counts = ps.executeBatch();⑶ BF_R8H,<%  
   conn.commit(); Z/wK UK;  
  }catch(Exception e){ aJC,  
   e.printStackTrace(); hK,e<?N^  
  } finally{ 'xUyGj:  
  try{ SJtQK-%wK>  
   if(ps!=null) { \P;%fN  
    ps.clearParameters(); >_Dq)n;%  
ps.close(); {/C \GxH+  
ps=null; ]i-peBxw  
  } `!.)"BI/s  
 }catch(SQLException e){} Y?(kE` R  
 DBUtils.closeConnection(conn); v: Av 2y  
 } @,<@y>m7  
} f;C*J1y  
public long getLast(){ g{zvks~it  
 return lastExecuteTime; vap,)kILF  
} |=^p`CT  
public void run(){ *Op;].>E  
 long now = System.currentTimeMillis(); P,x'1 `k~  
 if ((now - lastExecuteTime) > executeSep) { nVF?.c  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); tSVN}~1\  
  //System.out.print(" now:"+now+"\n"); FYI*44E  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); cuO)cj]@e  
  lastExecuteTime=now; d;3/Vr$t=  
  executeUpdate(); IcM99'P(  
 } fb7Gy  
 else{ OSk+l  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); lLO|,  
 } phu`/1;p  
} W=fw*ro  
} ,9I %t%sb  
//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 Fb&Xy{kt1  
+*2]R~"M  
  类写好了,下面是在JSP中如下调用。 g-0?8q5T6  
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<% 4+ BWHV  
CountBean cb=new CountBean(); 9E/{HNkf  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); >hkmL](^  
CountCache.add(cb); gOpi>  
out.print(CountCache.list.size()+"<br>"); =.=4P~T&  
CountControl c=new CountControl(); 4l/hh|3@  
c.run(); ,f@$a3}'Lx  
out.print(CountCache.list.size()+"<br>"); *=Ko"v }  
%>
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