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: ,beS0U]
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CountBean.java vy[C'a
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/* +>SRrIi
* CountData.java V^TbP.
* _|A+) K
* Created on 2007年1月1日, 下午4:44 {]^O:i"
* /,2rjJ#b
* To change this template, choose Tools | Options and locate the template under ;'0=T0\
* the Source Creation and Management node. Right-click the template and choose s9 @Sd
* Open. You can then make changes to the template in the Source Editor. .fp&MgiQ
*/ Xh
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package com.tot.count; XRxj W
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/** I-DXb
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* :5b0np!
* @author T7[NcZ:I
*/ WF[bO7:
public class CountBean { F'FP0t!S
private String countType; 4t*so~
int countId; 2: SO_O4C
/** Creates a new instance of CountData */ v+xB7w
public CountBean() {} 6~xBi(m`
public void setCountType(String countTypes){ Ls}7VKl'
this.countType=countTypes; qtMD CXZ^n
} Rko M~`CT
public void setCountId(int countIds){ .UQE{.?
this.countId=countIds; 2'] KTHm
} <CZgQ\Mt
public String getCountType(){ Dvc&RG
return countType; e2cP
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} 5)UQWnd5
public int getCountId(){ ;wHCj$q
return countId; > 'i
} e#S0Fk)z
} A&"%os
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CountCache.java ?6"{!s{v
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/* n}?wVfEy
* CountCache.java \)/yC74r7(
* GpI!J}~m
* Created on 2007年1月1日, 下午5:01 +?dl`!rE
* c{Ou^.yR
* To change this template, choose Tools | Options and locate the template under xfFg,9w8
* the Source Creation and Management node. Right-click the template and choose ba@ctkCW
* Open. You can then make changes to the template in the Source Editor. %IY``r)j
*/ {A:j[
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package com.tot.count; t9cl"F=
import java.util.*; ;
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/** F_H82BE+3
* S1S;F9F
* @author A/}W&bnluD
*/ bt$)Xu<R
public class CountCache { y*23$fj(
public static LinkedList list=new LinkedList(); ?LK 2g
/** Creates a new instance of CountCache */ [yS#O\$'e
public CountCache() {} 1P(&J
public static void add(CountBean cb){ U;q];e:,=}
if(cb!=null){ SF[FmN!^^
list.add(cb); t#i,1aHA
} !?!C'-ps
} )B$;Vs]@i
} nNt1C
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CountControl.java ep/Y^&$M
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/* 04U")-\O
* CountThread.java Y>+y(ck
* N!2Rl
* Created on 2007年1月1日, 下午4:57 U#&7p)4(
* cV{o?3<:B
* To change this template, choose Tools | Options and locate the template under F4L;BjnJ
* the Source Creation and Management node. Right-click the template and choose o*rQP!8,oy
* Open. You can then make changes to the template in the Source Editor. x1&W^~
*/ 2L?!tBw?1
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package com.tot.count; Bi,;lR5
import tot.db.DBUtils; GH1"xR4!
import java.sql.*; umi5Wb<
/** s?R2B)a
* h vka{LD
* @author cWyW~Ek
*/ ',^+bgs5
public class CountControl{ Uyx!E4pl(
private static long lastExecuteTime=0;//上次更新时间 -Go 7"j
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 r.ZF_^y}+
/** Creates a new instance of CountThread */ L|@y&di
public CountControl() {} qqrq11W
public synchronized void executeUpdate(){ svf|\p>]H
Connection conn=null; !V2/A1?
PreparedStatement ps=null; sZGj"_-Hzu
try{ B=8Iu5m
conn = DBUtils.getConnection(); GVHV =E
conn.setAutoCommit(false); Xce0~\_A
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >K9#3
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for(int i=0;i<CountCache.list.size();i++){ 4;`oUt'.
CountBean cb=(CountBean)CountCache.list.getFirst(); _j?e~w&0b
CountCache.list.removeFirst(); _WX tB#
ps.setInt(1, cb.getCountId()); a]
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ps.executeUpdate();⑴ jO*l3:!~ \
//ps.addBatch();⑵ %wcSM~w
} :+Om]#`Vls
//int [] counts = ps.executeBatch();⑶ ^j#rZ;uc
conn.commit(); B33$pUk
}catch(Exception e){ 4lhw3,5
e.printStackTrace(); @Z>ZiU,^
} finally{ '52~$z#m
try{ t58e(dgi
if(ps!=null) { )9l^O
ps.clearParameters(); !l]dR@e
ps.close(); Wjhvxk
ps=null; &nBa=Enf
} J]f3CU,<N
}catch(SQLException e){} +)o}c"P!
DBUtils.closeConnection(conn); tyaA\F57
} FFdBtB
} b4^`DHRu6
public long getLast(){ ;22oY>w
return lastExecuteTime; 7qTE('zt
} otggN:^Qw
public void run(){ EdZ\1'&/9
long now = System.currentTimeMillis(); gUyR_5q)8l
if ((now - lastExecuteTime) > executeSep) { !,V{zTR
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5waKI?4F
//System.out.print(" now:"+now+"\n"); ^&y$Wd]6
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); \]$IDt(s
lastExecuteTime=now; _uc
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executeUpdate(); Xd^\@
} .{y
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else{ KM^ufF2[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); y~()|L[
} ME'|saP
} _6ay-u
} RV@*c4KvO+
//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 6 G=j6gK%P
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类写好了,下面是在JSP中如下调用。 xhcK~5C
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<% 4:g R r
CountBean cb=new CountBean(); 0}_[DAd6
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); giz7{Ai
CountCache.add(cb); qucq,Yw
out.print(CountCache.list.size()+"<br>"); x c{hC4^V
CountControl c=new CountControl(); +\v?d&.f0
c.run(); Q7W>qe%4
out.print(CountCache.list.size()+"<br>"); GnvL'ESa@M
%>