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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: E]68IuP@'  
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  CountBean.java "2 Kh2[K  
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/* n04Zji(F@  
* CountData.java 7y:J@fh<  
* 5[0n'uH  
* Created on 2007年1月1日, 下午4:44 wL:3RZB  
* 8^O|Aa$IF:  
* To change this template, choose Tools | Options and locate the template under 4Y Kb~1qkk  
* the Source Creation and Management node. Right-click the template and choose YYhRdU/g  
* Open. You can then make changes to the template in the Source Editor. IkD\YPL;  
*/ .7oz  
Mq$e5&/  
  package com.tot.count; BsxQW`>^y  
f;QWlh"9  
/** f@Db._ E  
* Nl1&na)K}  
* @author */6PkNq  
*/ 0%v p'v  
public class CountBean { CYz]tv}g:  
 private String countType; hEDj"`Px  
 int countId; Pj^6.f+  
 /** Creates a new instance of CountData */ cd\0  
 public CountBean() {} ucyxvhH^-  
 public void setCountType(String countTypes){ n:HF&j4C,  
  this.countType=countTypes; 0nBAO  
 } euQ d  
 public void setCountId(int countIds){ H$Q_K<V  
  this.countId=countIds; i: 1V\q%  
 } f.Jz]WXw,  
 public String getCountType(){ ^lf)9 `^U  
  return countType; \!`*F :7]-  
 } i,,UD  
 public int getCountId(){ ^ *RmT  
  return countId; 6:@tHUm  
 } p,U.5bX  
} #VtlXr>G  
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  CountCache.java F8.Fp[_tM  
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/* a>6!?:Rj  
* CountCache.java V 9][a  
* @32JMS<  
* Created on 2007年1月1日, 下午5:01 Sky!ZN'I  
* v:eVK!O  
* To change this template, choose Tools | Options and locate the template under [ q22?kT  
* the Source Creation and Management node. Right-click the template and choose (eFHMRMv~  
* Open. You can then make changes to the template in the Source Editor. Mvu!  
*/ ^I@43Jy/  
)FYz*:f>&  
package com.tot.count; g#W)EXUR  
import java.util.*; ohOze\T)=  
/** y.HE3tH  
* ZF>zzi+@  
* @author b1R%JY7/S  
*/ 6l<q  
public class CountCache { X*/j na"*  
 public static LinkedList list=new LinkedList(); ZU5hHah.t  
 /** Creates a new instance of CountCache */ 7jvf:#\LtL  
 public CountCache() {} }]'Z~5T  
 public static void add(CountBean cb){ Quqts(Q)+  
  if(cb!=null){ C5$1K'X@  
   list.add(cb); i.C+{QH  
  } "o+< \B~  
 } ^/U-(4O05*  
} UzWf_r  
r1}YN<+,s  
 CountControl.java  W^Wr  
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 /* g kT`C  
 * CountThread.java c R*D)'/tl  
 * ~K5eO-  
 * Created on 2007年1月1日, 下午4:57 X3 P~z8_  
 * 1.6yi];6  
 * To change this template, choose Tools | Options and locate the template under r8A   
 * the Source Creation and Management node. Right-click the template and choose Mpzt9*7R  
 * Open. You can then make changes to the template in the Source Editor. BRLrD/8Le  
 */ !uLz%~F  
x* ?-KS|  
package com.tot.count; |@`F !bnLr  
import tot.db.DBUtils; p Wa'Fd  
import java.sql.*; )v !GiZ" 7  
/** omevF>b;  
* {N42z0c  
* @author B4Ko,=pg  
*/ ]%>7OH'  
public class CountControl{ ry)g<OA  
 private static long lastExecuteTime=0;//上次更新时间  Uus%1hC%a  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Up*1j:_O  
 /** Creates a new instance of CountThread */ hLK5s1#K  
 public CountControl() {} !W4A 9Th  
 public synchronized void executeUpdate(){ +i HZ*  
  Connection conn=null; jeXP|;#Una  
  PreparedStatement ps=null; T#KF@8'-  
  try{ k<(G)7'gm  
   conn = DBUtils.getConnection(); -5B>2K F  
   conn.setAutoCommit(false); 5#|D1A  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Hz~?"ts@;  
   for(int i=0;i<CountCache.list.size();i++){ <cS"oBh&u0  
    CountBean cb=(CountBean)CountCache.list.getFirst(); B?n 6o|8  
    CountCache.list.removeFirst(); {,xI|u2R  
    ps.setInt(1, cb.getCountId()); Ck.LsL-  
    ps.executeUpdate();⑴ s2F<H#  
    //ps.addBatch();⑵ T-,T)R`R  
   } R<(kiD\?]  
   //int [] counts = ps.executeBatch();⑶ w(Jf;[o  
   conn.commit(); X?'ShXI  
  }catch(Exception e){ A.-j 5C4  
   e.printStackTrace(); u*}[fQ`aF  
  } finally{ 8k~$_AT>u  
  try{ 5>CmWMQ  
   if(ps!=null) { W3Gg<!*Uo  
    ps.clearParameters(); fL$U%I3  
ps.close(); nUb0R~wr$G  
ps=null; vX?MB  
  } n0)0"S|y1  
 }catch(SQLException e){} S:5vC {  
 DBUtils.closeConnection(conn); vtx3a^  
 } AUk-[i  
} ~V34j:  
public long getLast(){ _L8|Z V./  
 return lastExecuteTime; "2'4b  
} IhR;YM[K  
public void run(){ pzr\<U`  
 long now = System.currentTimeMillis(); '0b!lVe  
 if ((now - lastExecuteTime) > executeSep) { n<,:;0{  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); <DeC^[-P  
  //System.out.print(" now:"+now+"\n"); 3bK.8  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); |NMf'$  
  lastExecuteTime=now; x)}.@\&%  
  executeUpdate(); &JUHm_wd&S  
 } fI<|]c}P&J  
 else{ <b.O^_zQF  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ~?6M4!u   
 } ~W/|RP7S  
} IN^dJ^1+  
} S"=y >.#  
//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 WNnB s  
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  类写好了,下面是在JSP中如下调用。 ]#NJ[IZb  
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<% 4 * n4P  
CountBean cb=new CountBean(); ]&b>P ;j:  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {)`tN&\  
CountCache.add(cb); 9M12|X\]8  
out.print(CountCache.list.size()+"<br>"); y|b&Rup  
CountControl c=new CountControl(); /}\Uw  
c.run(); ztEM>xsk  
out.print(CountCache.list.size()+"<br>"); eo [eN.  
%>
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