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: Sw8]EH6
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CountBean.java RXpw!
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/* n.`($yR_
* CountData.java &0OG*}gi
* 'KS,'%
* Created on 2007年1月1日, 下午4:44 z0p*Z&
* "3)C'WlEy/
* To change this template, choose Tools | Options and locate the template under B:;pvW]
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. ~q@|l3?$
*/ MSQEO4ge
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package com.tot.count; fo*2:?K&
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/** J{p1|+h%
* TluW-S
* @author *v
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*/ N
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public class CountBean { xjuN-
private String countType; p*R;hU
int countId; N_kMK
/** Creates a new instance of CountData */ $Uq|w[LA
public CountBean() {} {3>$[bT
public void setCountType(String countTypes){ F 5bj=mI
this.countType=countTypes; VuhGx:Xl
} 7Utn\l
public void setCountId(int countIds){ 8O5s`qKMYT
this.countId=countIds; sQUM~HD\a
} MnsJEvn/
public String getCountType(){ 9|^2",V
return countType; AP n| \
} aD<A.Lhy
public int getCountId(){ e8>})
return countId; f
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} O@T9x$
} X[-xowE-
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CountCache.java (+w*[qHe
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/* JK7G/]j+Ez
* CountCache.java x77*c._3v
* yJ[0WY8<kC
* Created on 2007年1月1日, 下午5:01 G*?8MTP8![
* a
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* To change this template, choose Tools | Options and locate the template under n2"a{Ofhlf
* the Source Creation and Management node. Right-click the template and choose 3H'sHuK"X
* Open. You can then make changes to the template in the Source Editor. _>o:R$ %}
*/ YU'k#\gi*
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package com.tot.count; gT6z9
import java.util.*; lne|5{h
/** vOH4#
* Ij7p'a
* @author :p1u(hflS
*/ m;$b'pT
public class CountCache { ^Y?k0z
public static LinkedList list=new LinkedList(); F;Spi
/** Creates a new instance of CountCache */ ^L,K& Jd
public CountCache() {} cRC6 s8
public static void add(CountBean cb){ .o6Or:L
if(cb!=null){ IY1//9
list.add(cb); {Ea
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} ,=uD^n:
} =?5]()'*n
} 1;* cq
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CountControl.java #]-SJWf3
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/* ImA @}:
* CountThread.java ^23~ZHu
* RV1coC.g4x
* Created on 2007年1月1日, 下午4:57 s$IDLs,WM
* "mo?*
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* To change this template, choose Tools | Options and locate the template under _OYasJUMG
* the Source Creation and Management node. Right-click the template and choose ?C]vS_jAh
* Open. You can then make changes to the template in the Source Editor. oE6tauQn
*/ mb1FWy=3
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package com.tot.count; L]7=?vN=8
import tot.db.DBUtils; +tB=OwU%0
import java.sql.*; pR<`H'
/** cUk7i`M;6
* vN}#Kc\
* @author -au^;CM
*/ VCYwzB
public class CountControl{ WH%g(6w1j
private static long lastExecuteTime=0;//上次更新时间 LPXi+zj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 qyb?49I
/** Creates a new instance of CountThread */ 'JtBZFq
public CountControl() {} `K"L /I9
public synchronized void executeUpdate(){ `6;?9NI
Connection conn=null; qfF~D0}
PreparedStatement ps=null; SZ7:u895E
try{ BX/8O<s0
conn = DBUtils.getConnection(); ?Rb9|`6
conn.setAutoCommit(false); wKh4|Ka
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); |o"?gB}Dh
for(int i=0;i<CountCache.list.size();i++){ m~BAyk^jo3
CountBean cb=(CountBean)CountCache.list.getFirst(); s3N'02G
CountCache.list.removeFirst(); z9f-.72"X
ps.setInt(1, cb.getCountId()); thh.A
ps.executeUpdate();⑴ B^=-Z8
//ps.addBatch();⑵ 6{K,c@VFd
} 4(n-_BS
//int [] counts = ps.executeBatch();⑶ E,Z$pKL?
conn.commit(); D_ 2:k'4
}catch(Exception e){ >IafUy
e.printStackTrace(); *][`@@->
} finally{ [&[k^C5
try{ Cl.x'v
if(ps!=null) { -:^U_FL8un
ps.clearParameters(); r+!YIk
ps.close(); D>r&}6<
ps=null; f^ZRT@`O
} Oxnp0 s
}catch(SQLException e){} a~`eQ_ND
DBUtils.closeConnection(conn); ;<Sd~M4f
} 2>9C-VL2
} ;]puq
public long getLast(){ X56q-|
return lastExecuteTime; l9~e".
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} B4/>H|
public void run(){ 0JS?; fk
long now = System.currentTimeMillis(); P{`C^W$J^
if ((now - lastExecuteTime) > executeSep) { v~+(GqR=+
//System.out.print("lastExecuteTime:"+lastExecuteTime); ~D+bh~
//System.out.print(" now:"+now+"\n"); G_tCmu\
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 8Zdn, }Z
lastExecuteTime=now; #'}*dy/
executeUpdate(); {!`6zBsP
} q@&6#B
else{ KP"+e:a%
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); S:Hl/:iV
} Si7*& dw=
} H[gWGbPq7
} AdmC&!nH
//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 JVJMgim)0
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类写好了,下面是在JSP中如下调用。 I*&8^r:A
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<% N;d] 14|
CountBean cb=new CountBean(); -} +[
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5\v3;;A[
CountCache.add(cb); *#2h/Q.
out.print(CountCache.list.size()+"<br>"); %C0Dw\A*:
CountControl c=new CountControl(); @c#(.=
c.run(); q| 7(
out.print(CountCache.list.size()+"<br>"); ,I9bNO,%JK
%>