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: gf/<sH2}
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CountBean.java A
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/* (!Fu5m=<8
* CountData.java ~P*{%= a
* Ve40H6Ox
* Created on 2007年1月1日, 下午4:44 H*",'`|-
* W4nhPH(
* To change this template, choose Tools | Options and locate the template under j& L@L.d
* the Source Creation and Management node. Right-click the template and choose ~O3VX75f
* Open. You can then make changes to the template in the Source Editor. SkU9iW(k
*/ h+9~^<oFl
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package com.tot.count; Nlu]f-i':
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/** R~RE21kAc
* >h(GmR*xM
* @author * C*aH6*
*/ D28>e
public class CountBean { q$}gQ9'z'
private String countType; *nV"X0&
int countId; OM@z5UP
/** Creates a new instance of CountData */ $ao7pvU6
public CountBean() {} NezE]'}
public void setCountType(String countTypes){ MK!Aq^Jz
this.countType=countTypes; L#!m|_Mz
} TA~ZN^xI
public void setCountId(int countIds){ t&_X{!1X"w
this.countId=countIds; a!;#u8f
} gMU%.%p2
public String getCountType(){ goJ'z|))
return countType; f{P?|8u
} ]oC"gWDYu
public int getCountId(){ !w;/ J^
return countId; fm
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} NB-%Tp*d
} R{Cbp=3J
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CountCache.java `Io#440;
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/* #G=AD/z
* CountCache.java Fe.90)
* [ B*r{
* Created on 2007年1月1日, 下午5:01 > iYdr/^a
* PM'2zP[*W
* To change this template, choose Tools | Options and locate the template under 32`Z3-
* the Source Creation and Management node. Right-click the template and choose ?F*I2rt#
* Open. You can then make changes to the template in the Source Editor. %al
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*/ 0;hn;(V]"
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package com.tot.count; ,RP 9v*
import java.util.*; d$Y_vX<
/** (;-_j/
* v 7%}ey[
* @author J|<C;[du>
*/ Np/vPaAk
public class CountCache { ;WhRDmT
public static LinkedList list=new LinkedList(); 8]rObT9>
/** Creates a new instance of CountCache */ RF~G{wz
public CountCache() {} 0?O_]SD
public static void add(CountBean cb){ 2IGU{&s
if(cb!=null){ m7i(0jd
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list.add(cb); Hx!eCTO:*
} 5hTScnL%
} vG\
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} @jrxbo;5
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CountControl.java *vq75k$7
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/* RL fQT_V
* CountThread.java / vu]ch
* 7xYz9r)w`
* Created on 2007年1月1日, 下午4:57 )g}G{9M^
* h0I5zQZm
* To change this template, choose Tools | Options and locate the template under tD4-Llj6
* the Source Creation and Management node. Right-click the template and choose I&<'A[vHl
* Open. You can then make changes to the template in the Source Editor. 1aUg({
*/
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package com.tot.count; ]'$:Y
import tot.db.DBUtils; .L]5,#2([
import java.sql.*; [(&aVHUj
/** #zBqj;p
* u7j,Vc'~
* @author ]q4(%Q
*/ 5fYWuc9}z
public class CountControl{ r3KNRr@
private static long lastExecuteTime=0;//上次更新时间 1GB]Yi[>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 q03+FLEfC
/** Creates a new instance of CountThread */ # s7e/GdKb
public CountControl() {} xvomn`X1
public synchronized void executeUpdate(){ 1kR. .p<"
Connection conn=null; B]Ec
PreparedStatement ps=null; #^R@EZ
try{ ;zV<63tW
conn = DBUtils.getConnection(); oK$Krrs0&
conn.setAutoCommit(false); VT=gb/W6)a
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); WNKg>$M
for(int i=0;i<CountCache.list.size();i++){ B<n[yiJ}
CountBean cb=(CountBean)CountCache.list.getFirst(); o[i*i<jv-
CountCache.list.removeFirst(); TQ0ZBhd
ps.setInt(1, cb.getCountId()); O f-xGoYZ
ps.executeUpdate();⑴ S.q0L
//ps.addBatch();⑵ bOp%
} D5f[:
//int [] counts = ps.executeBatch();⑶ (hg6<`
conn.commit(); 8Op^6rX4
}catch(Exception e){ lNl.lI\t)y
e.printStackTrace(); %r*,m3d
} finally{ MUGoW;}v)
try{ RDjw|V
if(ps!=null) { EuImj#Zl
ps.clearParameters(); nwC*w`4
ps.close(); c_?^:xs:d
ps=null; 67Qu<9}<-
} 78~/1-
}catch(SQLException e){} m g@Ol"2
DBUtils.closeConnection(conn); "*N#-=MJF
} b{{ H@LTW
} 56.JBBZZ
public long getLast(){ P1B=fgT
return lastExecuteTime; >VQLC&u(
} q-uzu !
public void run(){ PAtv#)h
long now = System.currentTimeMillis(); 9F?-zn;2s
if ((now - lastExecuteTime) > executeSep) { CQ^(/B^c
//System.out.print("lastExecuteTime:"+lastExecuteTime); <t*<SdAq>`
//System.out.print(" now:"+now+"\n"); f?ibyoXL
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ysl#Rwt/2
lastExecuteTime=now; ,J-|.ER->
executeUpdate(); p]/[ji
} r|jM;
else{ ~K99DK.
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); AI#.+PrC{/
} m%>}T75C^
} ^cSfkBh
} }#%Ye CA?
//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 -!O8V
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类写好了,下面是在JSP中如下调用。 @:#J^CsM+'
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<% +`>E_+Mp
CountBean cb=new CountBean(); (C"q-0?n
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Xw<;)m
CountCache.add(cb); &=$f\O1Ty
out.print(CountCache.list.size()+"<br>"); )b>misb/
CountControl c=new CountControl(); F4WX$;1
c.run(); m)"(S
out.print(CountCache.list.size()+"<br>"); @G=7A;-pv0
%>