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: 7GfgW02
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CountBean.java 66D<Up'K
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/* D/V.o}X$
* CountData.java J[YA1
* y4VCehdJ
* Created on 2007年1月1日, 下午4:44 L;nRI.
* ' F`*(\#
* To change this template, choose Tools | Options and locate the template under i0-!!
* the Source Creation and Management node. Right-click the template and choose vbqI$F[s
* Open. You can then make changes to the template in the Source Editor. x~ s>
*/ 98Srn63O
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package com.tot.count; n8[sR;r5f
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/** ?#}=!$p
* 2@08 V|
* @author H4l:L(!D
*/ FPaj
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public class CountBean { )@eBe^
private String countType; \^Y#"zXo1
int countId; ;T#t)oV
/** Creates a new instance of CountData */ -B4uK
public CountBean() {} kjNA~{
public void setCountType(String countTypes){ bIp;$ZHy`K
this.countType=countTypes; QIi*'21a+
} CSr{MF`]e
public void setCountId(int countIds){ C^nL{ZP,
this.countId=countIds; nyQFS
} yl 0?Y
public String getCountType(){ -mY90]g
return countType; Z6D4VZVF
} V]q{N-Iq
public int getCountId(){ iM8hGQ`
return countId; Ub3,x~V
} `yQHPN0/
} ~%#?;hJ
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CountCache.java l06 q1M 3
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/* 1/cb;:h>
* CountCache.java _
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* lg8~`96
* Created on 2007年1月1日, 下午5:01 5&}icS
* >F+:ej
* To change this template, choose Tools | Options and locate the template under rA1
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* the Source Creation and Management node. Right-click the template and choose HhqqJEp0
* Open. You can then make changes to the template in the Source Editor. $35Oyd3s<
*/ hJ}G5pX
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package com.tot.count; Ix(4<s
import java.util.*; M2s
/** {#[a4@B0
* 2X*epU_1h
* @author c<H4rB
*/ ItRGq
public class CountCache { #5H@/o8!s=
public static LinkedList list=new LinkedList(); VqbiZOZ@
/** Creates a new instance of CountCache */ M}nalr+#
public CountCache() {} .s!:p pwl
public static void add(CountBean cb){ mdZELRu
if(cb!=null){ plf<O5'
list.add(cb); 5=?&q 'i
} SHGO;
} yq<YGNy!
} hCDI;'ls
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CountControl.java cYp}$
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/* mi-\PD>X
* CountThread.java l,X;<&-[
* Gg!))I+
* Created on 2007年1月1日, 下午4:57 %b*%'#iK
* MO D4O4z&
* To change this template, choose Tools | Options and locate the template under [%@zH
* the Source Creation and Management node. Right-click the template and choose }UO,R~q~
* Open. You can then make changes to the template in the Source Editor. 6
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*/ $?s^HKF~
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package com.tot.count; ]u,~/Gy
import tot.db.DBUtils; C{ti>'"V
import java.sql.*; {c1qC zM4
/** {jVFlKP>
* ex=~l O
* @author OP&[5X+Y
*/ j~{2fd<>
public class CountControl{ wiGwN
private static long lastExecuteTime=0;//上次更新时间 yjr@v!o
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Ax%BnkU
/** Creates a new instance of CountThread */ K@i*Nl
public CountControl() {} 3(&.[o
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public synchronized void executeUpdate(){ _qg6(
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Connection conn=null; '
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PreparedStatement ps=null; Z`*cI
try{ nx4aGS"F:
conn = DBUtils.getConnection(); s/^k;qw
conn.setAutoCommit(false); \1!k)PZdTW
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Qx6/QaS?
for(int i=0;i<CountCache.list.size();i++){ ZFON]$Zk
CountBean cb=(CountBean)CountCache.list.getFirst(); Lm?*p>\Q
CountCache.list.removeFirst(); H6I #Xj
ps.setInt(1, cb.getCountId()); X2`>@GR/>
ps.executeUpdate();⑴ A!D:Kc3
//ps.addBatch();⑵ V9VP"kD
} m@@QT<
//int [] counts = ps.executeBatch();⑶ (2li:1j
conn.commit(); OeYLL4H
}catch(Exception e){ vo$66A
e.printStackTrace(); 2X*<Fma3C
} finally{ mc'p-orAf
try{ J$Epj
if(ps!=null) { %Let AR
ps.clearParameters(); @QG1\W'
ps.close(); =M5M;
ps=null; HWhKX:`l
} _);Kb/
}catch(SQLException e){} 0I((UA/7Zs
DBUtils.closeConnection(conn); fYy.>m+P1
} YZl%JX
} JNaW>X$K
public long getLast(){ ?6d4T
return lastExecuteTime; !j9i=YDb
} h*UUtLi%WU
public void run(){ S=p u
long now = System.currentTimeMillis(); 'I]"=O,
if ((now - lastExecuteTime) > executeSep) { 8>q%1]X
//System.out.print("lastExecuteTime:"+lastExecuteTime); kW&Z%k
//System.out.print(" now:"+now+"\n"); v{ n}%akc
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^gzNP#A<'o
lastExecuteTime=now; Fz&ilB
executeUpdate(); SAh054/St
} suFOc
else{ AJfi,rFPg
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); kA!(}wRL
} hxVM]e[
} 1:zu$|%7
} I&8SP$S>J
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 oxQID
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类写好了,下面是在JSP中如下调用。 Us,[x Q
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<% WWW#s gM%
CountBean cb=new CountBean(); /}`/i(k
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); }.UI&UZ-
CountCache.add(cb); ~e77w\Q0
out.print(CountCache.list.size()+"<br>"); arS'th:j
CountControl c=new CountControl(); k(z<Bm
c.run(); :$i:8lz
out.print(CountCache.list.size()+"<br>"); |4.o$*0Y
%>