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: d{fd5jv;
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CountBean.java +hRy{Ps/
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/* tA(oD4H9
* CountData.java 8"h;+;
* fG\"p
* Created on 2007年1月1日, 下午4:44 E@ea?Sx
* ZqclmCi
* To change this template, choose Tools | Options and locate the template under SeHrj&5U
* the Source Creation and Management node. Right-click the template and choose S{^x]h|?
* Open. You can then make changes to the template in the Source Editor. 72l:[5ccR
*/ }a" =K%b<\
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package com.tot.count; aO{@.
j@xIa-{*
/** bxa>:71
* r_+Vb*|Y
* @author =%U&$d|@G
*/ )Jt. Z^J<
public class CountBean { mm>l:M TF
private String countType; GCl
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int countId; WJ8i=MO67
/** Creates a new instance of CountData */ $%EX~$=m]-
public CountBean() {} h0F=5| B
public void setCountType(String countTypes){ @Ou
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this.countType=countTypes; Cu@q*:'
} , Q0Y} )
public void setCountId(int countIds){ ]!ai?z%cK#
this.countId=countIds; .@{v{
} {V7mpVTX.
public String getCountType(){ S)hDsf.I
return countType; aen%
} `:&RB4Z
public int getCountId(){ N82 6xvA
return countId; <zXG}JuL@T
} ?NA$<0
} P%R!\i
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CountCache.java !Q\*a-C
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/* !/G}vu
* CountCache.java P5my]4|x
* "G%S
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* Created on 2007年1月1日, 下午5:01 ,$`}Rf<
* t?9J'.p
* To change this template, choose Tools | Options and locate the template under %U{6 `m
* the Source Creation and Management node. Right-click the template and choose +2MF#{ tS
* Open. You can then make changes to the template in the Source Editor. EMnz;/dMt
*/ )M;~j
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package com.tot.count; p@pb[Bx~[
import java.util.*; +pYgh8w@
/** w10~IP
* |47t+[b
* @author ^p(aZj3k
*/ QtfL'su:
public class CountCache { [pU(z'caS
public static LinkedList list=new LinkedList(); -W!M:8
/** Creates a new instance of CountCache */
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public CountCache() {} L9) gN.#
public static void add(CountBean cb){ y],opG6
if(cb!=null){ "6C
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list.add(cb); q:kGJxfaW
} 5&%M L
} d5-Q}D,P
} PxYK)n9&
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CountControl.java G^{~'TZv%
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/* 0d2RB^"i
* CountThread.java *
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* >V8!OaY5n
* Created on 2007年1月1日, 下午4:57 -aBhN~
* mh4 VQ9
* To change this template, choose Tools | Options and locate the template under <yl@!-'J7
* the Source Creation and Management node. Right-click the template and choose OGcdv{,P
* Open. You can then make changes to the template in the Source Editor. qGq]E`O
*/ 25Ee+&&%
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package com.tot.count; !{*yWpZ:
import tot.db.DBUtils; qt.4dTd:_
import java.sql.*; cEf"m?w
/** ;G`]`=s#Lq
* <k[_AlCmsg
* @author u$tst_y-
*/ gZ&4b'XS,
public class CountControl{ 4U\>TFO
private static long lastExecuteTime=0;//上次更新时间 W'"hjQ_
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 uPl7u1c
/** Creates a new instance of CountThread */ m>+
public CountControl() {} R@grY:h
public synchronized void executeUpdate(){ z~f;}`0
Connection conn=null; G\tN(%.f
PreparedStatement ps=null; Pz*BuL<
try{ >!Gq[i0
conn = DBUtils.getConnection(); gGE{r}$
conn.setAutoCommit(false); W/A@q o"
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); sT =|"H?
for(int i=0;i<CountCache.list.size();i++){ X"3p/!W.4
CountBean cb=(CountBean)CountCache.list.getFirst(); Q}Ah{H0C
CountCache.list.removeFirst(); n7i~^nf>
ps.setInt(1, cb.getCountId()); tX%
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ps.executeUpdate();⑴ ,eTdQI;
//ps.addBatch();⑵ _3W .:
} EwcFxLa!F
//int [] counts = ps.executeBatch();⑶ _S[@?]=`b
conn.commit(); NI"Zocp
}catch(Exception e){ o~Hq&C"^}
e.printStackTrace(); Zbl*U(KU?
} finally{ ThP~k9-
try{ 8Y%
if(ps!=null) { 2FdwX,O.
ps.clearParameters(); lq-F*r\/~+
ps.close(); o[wiQ9Tl
ps=null; SeZ+&d
} el<Gd.p.d
}catch(SQLException e){} 1\Bh-tzB
DBUtils.closeConnection(conn); }^H(EHE
} 5Bq;Vb
} %@(+`CCA
public long getLast(){ _!|$ i
return lastExecuteTime; t{UWb~"
} |H=5Am
public void run(){ n[y=DdiKGS
long now = System.currentTimeMillis(); ?lqqu#;8
if ((now - lastExecuteTime) > executeSep) { Q,9KLi3
//System.out.print("lastExecuteTime:"+lastExecuteTime); T-n>+G{
//System.out.print(" now:"+now+"\n"); ~{g/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %;]/Z%!
lastExecuteTime=now; z1tD2jL _
executeUpdate(); pqv l,G5
} (=rDt93J
else{ i:N-Q)<Q*)
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); \8*j"@ !H
} us5Zi# }
} K
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} %iPIgma
//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 sMAH;'`!Eu
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类写好了,下面是在JSP中如下调用。 T__@hfT
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<% Y:CqQ
CountBean cb=new CountBean(); o ;9H~E
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); dC4`xUv
CountCache.add(cb); UCmJQJc
out.print(CountCache.list.size()+"<br>"); B4*,]lS?
CountControl c=new CountControl(); h+dk2|a
c.run(); )y!gApNs"
out.print(CountCache.list.size()+"<br>"); 3bLOT#t
%>