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: ,sln0
eh5j
CountBean.java "l.1 UB&
41Htsj
/* mZ^ev;
* CountData.java WZ]f \S
* i1k#WgvZR
* Created on 2007年1月1日, 下午4:44 [mJmT->
* `am]&0g^+(
* To change this template, choose Tools | Options and locate the template under sfwlv^
* the Source Creation and Management node. Right-click the template and choose /2#1Oi)o
* Open. You can then make changes to the template in the Source Editor. Ihn+_Hu
*/ hA!kkNqV
NsY D~n
package com.tot.count; 8fX<,*#I
?OFl9%\ V
/** =vc8u&L2
* `R+I(Cb
* @author 4A@77#:J5
*/ /yn%0Wish
public class CountBean { Z<^TO1xs9B
private String countType; 67{>x[
int countId; L}x,>hbT
/** Creates a new instance of CountData */ +M/1,&
public CountBean() {} 32KL~32Y
public void setCountType(String countTypes){ r}]%(D](v
this.countType=countTypes; SB#Y^!
} ;LjTsF'
public void setCountId(int countIds){ eK=<a<tx
this.countId=countIds; *sbZ{{]e
} jJOs`'~Q\
public String getCountType(){ P/hV{@x
return countType; - IF3'VG
} {Z^ G]@
public int getCountId(){ [;n/|/m,
return countId; r(Vz(
} (yB)rBh>n
} xG|T_|?
J jp)%c#_
CountCache.java yv2N5IQ>{V
?cRGdLP'D
/* b!J%s
* CountCache.java Sl7x>=
* ZgD%*bH*B
* Created on 2007年1月1日, 下午5:01 swGp{wJ
* ~?#B(t
* To change this template, choose Tools | Options and locate the template under
+91j 1?
* the Source Creation and Management node. Right-click the template and choose VvSe`E*
* Open. You can then make changes to the template in the Source Editor. N(W;\>P
*/ `HO_t ek
<g4[p^A
package com.tot.count; yy*8Aw}
import java.util.*; o&Vti"fpC
/** Zl4X,9Wt
* uz%<K(:Ov
* @author i3[%]_eP.
*/ p6Ie ?Gg
public class CountCache { , A@uSfC(
public static LinkedList list=new LinkedList(); XHER [8l
/** Creates a new instance of CountCache */
c1x{$
public CountCache() {} a(Fx1`}
public static void add(CountBean cb){ v%2 @M
if(cb!=null){ + <4gJoI
list.add(cb); g,61'5\
} iT2{3t
} .4&pi
} *?v_AZ
%/:0x:ns
CountControl.java
}\$CU
N
BD.>aAi!
/*
Q%*987i
* CountThread.java d(X/N2~g
* HkL`-
c0
* Created on 2007年1月1日, 下午4:57 vv
FH (W
* aF!Im}
* To change this template, choose Tools | Options and locate the template under WNmG'hlA
* the Source Creation and Management node. Right-click the template and choose |@*3
nb8
* Open. You can then make changes to the template in the Source Editor. Ua2wa A
*/ wS"`~Ql_
Dm+[cA"I
package com.tot.count; :H(wW
import tot.db.DBUtils; Q dPqcw4+X
import java.sql.*; H,q-*Kk
/** ;rqW?':(i
* 9m+ejTK{U
* @author km,I75o.
*/ e\7AtlW"
public class CountControl{ y:Ne}S*ncE
private static long lastExecuteTime=0;//上次更新时间 n)t'?7
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 uK;&L?WB
/** Creates a new instance of CountThread */ -2/&i
public CountControl() {} ]H$Trf:L
public synchronized void executeUpdate(){ Svl;Ul
Connection conn=null; =73aME}
PreparedStatement ps=null; h; "pAE
try{ F+ Dke>j
conn = DBUtils.getConnection(); "PePiW(i+
conn.setAutoCommit(false); &rbkw<=j
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); F>lM[Lu#
for(int i=0;i<CountCache.list.size();i++){ :6[G;F7s
CountBean cb=(CountBean)CountCache.list.getFirst(); 9pMXjsE
CountCache.list.removeFirst(); pAtt=R,Ht
ps.setInt(1, cb.getCountId()); ]*]#I?&'Hx
ps.executeUpdate();⑴ 3n3$? oV
//ps.addBatch();⑵ ZTg[}+0e
} bHK[Z5
//int [] counts = ps.executeBatch();⑶ 9~5LKg7Ac
conn.commit(); Tf{lH9ca$
}catch(Exception e){ F"| ;
e.printStackTrace(); %u!)1oOIz
} finally{ LFX[v
try{ f!K{f[aDa
if(ps!=null) { 9cXL4
ps.clearParameters(); UpSa7F:Uw
ps.close(); 'Y22HVUX
ps=null; [R(d Cq>
} dh-?_|"
}catch(SQLException e){} S[5OTwa8L
DBUtils.closeConnection(conn); #DA ,*
} K
+l-A>Ic
} =v(&qh9Q2
public long getLast(){ CsX@u#
return lastExecuteTime; E|"QYsi.Ck
} 9 Eqv^0u
public void run(){ <El!,UBq<
long now = System.currentTimeMillis(); qE*h UzA
if ((now - lastExecuteTime) > executeSep) { Txa
2`2t7
//System.out.print("lastExecuteTime:"+lastExecuteTime); 1deK}5'
//System.out.print(" now:"+now+"\n"); UXPF"}S2
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); OIY
lastExecuteTime=now; gHox>r6.A
executeUpdate(); cXIuGvE&=
} f#&@Vl(i&
else{ ~sVbg$]\ G
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ^5q}M'
} Fgw$;W
} #:E^($v
} x }.&?m
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 Ch'e'EmI
]vjMfT%]W
类写好了,下面是在JSP中如下调用。 4&<zkAMR
*],=!
<% z0 J:"M
CountBean cb=new CountBean(); 1B`JvNtd
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^%t{:\
CountCache.add(cb); p?'
F$Wz
out.print(CountCache.list.size()+"<br>");
Exz(t'
CountControl c=new CountControl(); "P!zu(h4
c.run(); ekCt1^5Y
out.print(CountCache.list.size()+"<br>"); &\W5|*`x-
%>