社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 8737阅读
  • 0回复

JSP高访问量下的计数程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
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: aB<~T[H%h  
{U(-cdU{e`  
  CountBean.java )0`;leli  
6NJ"ty9Bp  
/* !>b>"\b  
* CountData.java q a#Fa)g*  
* 6PT ,m  
* Created on 2007年1月1日, 下午4:44 K"Vv=  
* c#nFm&}dm  
* To change this template, choose Tools | Options and locate the template under `;WiTE)&)  
* the Source Creation and Management node. Right-click the template and choose >i~W$; t  
* Open. You can then make changes to the template in the Source Editor. /S1EQ%_  
*/ *#e%3N05_  
Da1BxbDeI  
  package com.tot.count; o%X_V!B{V  
@/H1}pM~  
/** Xtbuy/8"1  
* qc~6F'?R  
* @author r&)/3^S '  
*/ \c>9f"jS_  
public class CountBean { zkn K2e,$  
 private String countType; s4P8PDhz  
 int countId; _1hc^j  
 /** Creates a new instance of CountData */ F6h3M~uR  
 public CountBean() {} .Br2^F  
 public void setCountType(String countTypes){ ~1wAk0G`n  
  this.countType=countTypes; ,0NVb7F;k  
 } 2H;&E1:  
 public void setCountId(int countIds){ dsX{  5  
  this.countId=countIds; [VIdw 92  
 } meu\jg  
 public String getCountType(){ -"u}lCz>  
  return countType; *XS@Ku  
 } -(~Tu>KaH  
 public int getCountId(){ VYTdK"%  
  return countId; LW?] ~|  
 } W=}l=o!G.  
} znhe]&Fw  
>T;"bc b  
  CountCache.java H`]nY`HYg  
^i_mGeu  
/* j]rE0Og  
* CountCache.java }Xyu" P  
* |TF,Aj   
* Created on 2007年1月1日, 下午5:01 )`F? {Sg  
* r!V#@Md  
* To change this template, choose Tools | Options and locate the template under l@Ma{*s6=5  
* the Source Creation and Management node. Right-click the template and choose ,,mkB6;  
* Open. You can then make changes to the template in the Source Editor. 'cy35M  
*/ nf+8OH7  
suj? e6  
package com.tot.count; 3ag*dBbs  
import java.util.*; ps"crV-W  
/** ,& =(DJ  
* 5fv eQI~!  
* @author l -_voOP  
*/ VF!?B>  
public class CountCache { \hQ[5>  
 public static LinkedList list=new LinkedList(); E}c(4RY  
 /** Creates a new instance of CountCache */ <i^Bq=E<rJ  
 public CountCache() {} XD{U5.z>y  
 public static void add(CountBean cb){ K8Gc5#OF  
  if(cb!=null){ |4YDvDEJi  
   list.add(cb); /u!I2DF  
  } '[I_Iu#,  
 } P[n` X  
} LT!B]y  
tS#EqMf&o  
 CountControl.java `j(\9j ok  
t9&)9,my  
 /* !EF~I8d\]  
 * CountThread.java + htTrHjt  
 * *6e`km  
 * Created on 2007年1月1日, 下午4:57 oaHg6PT!  
 * jU)r~QhN  
 * To change this template, choose Tools | Options and locate the template under TU$/3fp*  
 * the Source Creation and Management node. Right-click the template and choose &zlwV"W  
 * Open. You can then make changes to the template in the Source Editor. tq}sXt  
 */ !Y!Cv %  
z!)_'A  
package com.tot.count; !e&ZhtTuC  
import tot.db.DBUtils; 'I($IM  
import java.sql.*; 3^q,'!PfB  
/**  "@Bc eD  
* ?}m/Q"!1  
* @author (WR&Vt4Rh  
*/ *I`Sc|A  
public class CountControl{ ;E(gl$c:  
 private static long lastExecuteTime=0;//上次更新时间  (u@[}!  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Z8(1QU,~2  
 /** Creates a new instance of CountThread */ 8;P8CKe  
 public CountControl() {} S9 <J \`FG  
 public synchronized void executeUpdate(){ x6* {@J&5*  
  Connection conn=null; <>A:Oi3^  
  PreparedStatement ps=null; 1}tZ,w>  
  try{ :7D&=n)  
   conn = DBUtils.getConnection(); 9b@L^]Kg  
   conn.setAutoCommit(false); /YR*KxIx  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [^A.$,  
   for(int i=0;i<CountCache.list.size();i++){ {0q;:7Bt  
    CountBean cb=(CountBean)CountCache.list.getFirst(); ElZ'/l*\  
    CountCache.list.removeFirst(); F}DdErd!f  
    ps.setInt(1, cb.getCountId()); R s_@L}U..  
    ps.executeUpdate();⑴ X |.'_6l.  
    //ps.addBatch();⑵ 1HskY| X  
   } (;$ J5  
   //int [] counts = ps.executeBatch();⑶ }.3F|H  
   conn.commit(); -i V&-oP  
  }catch(Exception e){ G`ZpFg0Y  
   e.printStackTrace(); @%IZKYf c~  
  } finally{ oylY1~~}0K  
  try{ +&jWM-T"-  
   if(ps!=null) { _K )B  
    ps.clearParameters(); <P3r+ 1|R  
ps.close(); <t,uj.9_  
ps=null; H4 Ca+;  
  } FviLlly6  
 }catch(SQLException e){} ik+qx~+`Qv  
 DBUtils.closeConnection(conn); {W3%n*q  
 } i@6MO'y  
} gAhCNOp  
public long getLast(){ lJ3/^Htn  
 return lastExecuteTime; TgSU}Mf)a  
} b3wE8Co  
public void run(){ 5`{+y]  
 long now = System.currentTimeMillis(); [z]@ <99/  
 if ((now - lastExecuteTime) > executeSep) { $yIcut7  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); }Y(Q7l  
  //System.out.print(" now:"+now+"\n"); |A8Ar7)  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &32qv` V_  
  lastExecuteTime=now; YPDc /  
  executeUpdate(); f_Y[I :  
 } D%LqLLD  
 else{ fGcAkEstT!  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (zWzF_v  
 } q]0a8[]3  
} x +! <_p  
} brb8C%j}9  
//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 QUaz;kNC7  
U`,&Q ]  
  类写好了,下面是在JSP中如下调用。 KunK.m  
*;7&  
<% u'd+:uH  
CountBean cb=new CountBean(); RsIEY5Q  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ?Mp~^sgp'  
CountCache.add(cb); VBF3N5 ;W  
out.print(CountCache.list.size()+"<br>"); (s %T1 8  
CountControl c=new CountControl(); V,<,;d fR  
c.run(); `=^29LC#  
out.print(CountCache.list.size()+"<br>"); HPCzh  
%>
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
10+5=?,请输入中文答案:十五