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: rE WPVT
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CountBean.java "@h 5
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/* kVG]zt2
* CountData.java NEY
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* h3z=tu['
* Created on 2007年1月1日, 下午4:44 zSU06Y
* }zK/43Vx
* To change this template, choose Tools | Options and locate the template under pN]$|#%q(
* the Source Creation and Management node. Right-click the template and choose vWM'}(
* Open. You can then make changes to the template in the Source Editor. #c2InwZV
*/ P0/B!8x
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package com.tot.count; 9F*],#ng
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/** 1zz.`.R2U
* eqFOPK5q
* @author #"Wh$x%
*/ GNv5yWQ@
public class CountBean { jNO8n)a&p
private String countType; l}Fa-9_'
int countId; m4@f&6x
/** Creates a new instance of CountData */ p| #gn<z}
public CountBean() {} O8J:Tw}M*
public void setCountType(String countTypes){ +.p$Yi`
this.countType=countTypes; 6BPZ2EQ
} |B0.*te6
public void setCountId(int countIds){ guD?~-Q
this.countId=countIds; lQ}e"#<
} &dC #nw
public String getCountType(){ @3UVl^T
return countType; Q I.*6-(
} ,;_D~7L
public int getCountId(){
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return countId; -6()$cl}0
} Vu6pl
} ,Cj8{s&;
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CountCache.java fC$~3v
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/* !`VO#_TJ
* CountCache.java CwV1~@{-
* Z_^v#FJ'l
* Created on 2007年1月1日, 下午5:01 yL&_>cV
* u D.E>.B
* To change this template, choose Tools | Options and locate the template under ;-G!jWt6Zi
* the Source Creation and Management node. Right-click the template and choose qwb`8o
* Open. You can then make changes to the template in the Source Editor. 7 %P?3
*/ ]/d4o
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package com.tot.count; >%"Q]p
import java.util.*; vd5"phn
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/** 3x9O(;k
* zn4Yo
* @author t?-7Z6
*/ FC= %_y
public class CountCache { n.m6n*sf7
public static LinkedList list=new LinkedList(); G0^O7w^5
/** Creates a new instance of CountCache */ MRB>(}
public CountCache() {} +njE
public static void add(CountBean cb){ ;'Pi(TA)
if(cb!=null){ n
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list.add(cb); (VPT% l6
} Yg;g!~
} jH*+\:UP-
} %;.|?gR
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CountControl.java X-Sso9/q.
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/* zN\~v
* CountThread.java NRS!Ox
* {C%/>e2-%
* Created on 2007年1月1日, 下午4:57 N_vVEIO9
* 4*UoTE-g$
* To change this template, choose Tools | Options and locate the template under {PM)D [$i
* the Source Creation and Management node. Right-click the template and choose l|-TGjsX
* Open. You can then make changes to the template in the Source Editor. X7sWu{n
*/ tPS.r.0#^
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package com.tot.count; ,EgIH%*g
import tot.db.DBUtils; {-rK:*yP'u
import java.sql.*;
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/** Ih}I`wY-
* K/~+bq#+
* @author HrA6wn\O
*/ Xu1l6jr_
public class CountControl{ ? OBe!NDf
private static long lastExecuteTime=0;//上次更新时间 ^i{B8]2,
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 s0Ii;7fA{
/** Creates a new instance of CountThread */ &)vX7*j
public CountControl() {} xDBEs*
public synchronized void executeUpdate(){ F<?e79},`
Connection conn=null; I `44}oJ
PreparedStatement ps=null; qYFol#=%
try{ GLb}_-|
conn = DBUtils.getConnection(); ;G.m;5A
conn.setAutoCommit(false); `07u}]d8
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); fB5Bh;K
for(int i=0;i<CountCache.list.size();i++){ Vgs( feGs
CountBean cb=(CountBean)CountCache.list.getFirst(); x8T5aS
CountCache.list.removeFirst(); g 1\4Jb
ps.setInt(1, cb.getCountId()); u[U~`*i*rA
ps.executeUpdate();⑴ do{#y*B/g!
//ps.addBatch();⑵ nzDS
} G'(
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//int [] counts = ps.executeBatch();⑶ 6|#^4D)
conn.commit(); f8! PeQ?
}catch(Exception e){ \n850PS
e.printStackTrace(); {KL<Hx2M
} finally{ Sv-}w$
try{ uNnwz%w
if(ps!=null) { +asJV1a
ps.clearParameters(); vi0% jsI
ps.close(); jh]wHG
ps=null; fHf+!
} Cc]s94
}catch(SQLException e){} ~}4o=O(
DBUtils.closeConnection(conn); ^ h^2='p
} +byw*Kk
} !23W=N}82
public long getLast(){ BzA(yCu$:
return lastExecuteTime; "zw?AC6
} G=3/PYp
public void run(){ H/Goaf%
long now = System.currentTimeMillis(); t1B0M4x9
if ((now - lastExecuteTime) > executeSep) { <uL?7P
//System.out.print("lastExecuteTime:"+lastExecuteTime); 'oTcx Jx
//System.out.print(" now:"+now+"\n"); NV;5T3
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ywk;
lastExecuteTime=now; z$-/yT"M
executeUpdate(); ,I=ClmR
} $X9Ban]
else{ B>o\;) l3O
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); vD) LRO
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} v%&f00
} 1q~U3'l:$
} !j4C:L3F
//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 .,,?[TI
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类写好了,下面是在JSP中如下调用。 P,iLqat
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<% *@G4i
CountBean cb=new CountBean(); 5G){7]P+r"
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); #X"\:yN
CountCache.add(cb); [ZURs3q
out.print(CountCache.list.size()+"<br>"); l4F4o6:]n
CountControl c=new CountControl(); =Gd[Qn83.%
c.run(); ]Nt97eD)
out.print(CountCache.list.size()+"<br>"); 2{p`"xX
%>