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: P-?ya!@"
fBptjt_
CountBean.java (P-Bmu!s
~
l'dpg
/* lkWID
* CountData.java (bIg6_U7\
* 2sJj -3J
* Created on 2007年1月1日, 下午4:44 94umk*ib
* +@Oo)#V|.
* To change this template, choose Tools | Options and locate the template under fXPD^}?Ux4
* the Source Creation and Management node. Right-click the template and choose e7<//~W7W
* Open. You can then make changes to the template in the Source Editor. 0{/P1
*/ |(E.Sb
pr2b<(Pm
package com.tot.count; p=Nord
2\xv Yf-
/** 3%<Uq%pJ
* L,&R0gxi
* @author H*DWDJxmV
*/ :RsO$@0G
public class CountBean { l@8UL</W
private String countType; F
j_r
n
int countId; H1(Zzn1
/** Creates a new instance of CountData */ XCNfogl
public CountBean() {} AZ7
public void setCountType(String countTypes){ Nj2f?',;U
this.countType=countTypes; o5(p&:1M
} 8:%=@p>$
public void setCountId(int countIds){ (GVH#}uB
this.countId=countIds; =|lKB;
} NzmVQ-4
public String getCountType(){ Fg3VD(D^U
return countType; +UxhSFU
} l:O6`2Z
public int getCountId(){ gHLBtl/
return countId; vV.TK_y
} [Yx)`e
} fI2/v<[
0W|}5(C
CountCache.java a}Db9 =
etX&o5A
/* #Y3:~dmJ-
* CountCache.java ,"PKGd]^
* 47R4gs#W
* Created on 2007年1月1日, 下午5:01 OC|9~B1
* g0m6D:f
* To change this template, choose Tools | Options and locate the template under Th&*
d;
* the Source Creation and Management node. Right-click the template and choose '/^bO# G:
* Open. You can then make changes to the template in the Source Editor. 4~Ptn / g
*/ =)Cqjp
ffuV158a&
package com.tot.count; PQ`p:=~>:i
import java.util.*; 7Vf2Qx1_
/** "T/
vE
* 289@O-
* @author jXEuK:exQ
*/ Lw
7,[?,Z
public class CountCache { &u62@ug#}
public static LinkedList list=new LinkedList(); y$VYWcFE
/** Creates a new instance of CountCache */ +~O0e-d
public CountCache() {} mC
P*v-
public static void add(CountBean cb){ $2uZdl8Rvj
if(cb!=null){
>:whNp
list.add(cb); @J~n$^ke
} o2
=UUD&
} 'iM;e K
} L lmdydC%
gU7@}P
CountControl.java ^goa$uxU
bWN%dn$$M
/* ,EyZ2`|
* CountThread.java EG<YxNX,
* j rX.e
* Created on 2007年1月1日, 下午4:57 MP|J 0=H5
* (9_~R^='y
* To change this template, choose Tools | Options and locate the template under cqzd9L6=
* the Source Creation and Management node. Right-click the template and choose GY@-}p~it
* Open. You can then make changes to the template in the Source Editor. L-}>;M$Y)
*/ \{F{yq(
_jV(Gv'
package com.tot.count; G.2ij%Zz
import tot.db.DBUtils; <}~`YU>=v
import java.sql.*; !`8WNY?K
/** #}50oWE
* K1rF;7Y6
* @author ;=IC.<Q<}
*/ $d1+ d;Mn
public class CountControl{ =VMV^[&>
private static long lastExecuteTime=0;//上次更新时间 O j<.3U[C
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8+no>%L
/** Creates a new instance of CountThread */ GE`:bC3
public CountControl() {} ,f`435R
public synchronized void executeUpdate(){ k r0PL)$
Connection conn=null; #hEN4c[Ex
PreparedStatement ps=null; W+
tI(JZ
try{ vkdU6CZO
conn = DBUtils.getConnection(); ze!S4&B
conn.setAutoCommit(false); >[ r
TUn;
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); aa8xo5tIp
for(int i=0;i<CountCache.list.size();i++){ gxEa?QH
CountBean cb=(CountBean)CountCache.list.getFirst(); -!uut7Z|
CountCache.list.removeFirst(); YNc]x>
ps.setInt(1, cb.getCountId()); ]:CU.M1
ps.executeUpdate();⑴ 8(R%?>8
//ps.addBatch();⑵ ueO&%
} {C>.fg%t
//int [] counts = ps.executeBatch();⑶ UGuEZ-r
conn.commit(); V[f-Nj Kf
}catch(Exception e){ +u%^YBr
e.printStackTrace(); 7^|oO~x6
} finally{ <3dmY=
try{ )i&z!|/2
if(ps!=null) { +I$c+WfU
ps.clearParameters(); B4^+&B#
ps.close(); WvG0hts=[
ps=null; cE}R7,y
} D}|PBR
}catch(SQLException e){} bWzv7#dd=
DBUtils.closeConnection(conn); z=TaB^-)
} }mRus<Ax
} >
Y
<in/
public long getLast(){
`ReTfz;o
return lastExecuteTime; QJc3@
} ~b+TkPU
public void run(){ Qq;` 9-&j
long now = System.currentTimeMillis(); 8'Dp3x^W>
if ((now - lastExecuteTime) > executeSep) { lWS@<j
//System.out.print("lastExecuteTime:"+lastExecuteTime); c"OBm#
//System.out.print(" now:"+now+"\n"); aC0[ OmbG
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); s`*
'JM<
lastExecuteTime=now; k9j_#\E[
executeUpdate(); `}:q@:%
} cstSLXD
else{ ,1'9l)zP
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); }Z
T{
} $:M *$r^u
} Jy)E!{#x
} wD|,G!8E2
//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 #L}YZ
uGm~ Oo
类写好了,下面是在JSP中如下调用。 ^R* _Q,o#
Bq~!_6fB
<% {UpHHH:X#
CountBean cb=new CountBean(); -<kl d+
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (4_7ICFI
CountCache.add(cb); )3<|<jwcx
out.print(CountCache.list.size()+"<br>"); EL!V\J`S_
CountControl c=new CountControl(); DA)+)PhY7K
c.run(); Q3MG+@) S
out.print(CountCache.list.size()+"<br>"); D"o}X TH
%>