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: 1U^KN~!
[}l 90 lP
CountBean.java E.0J94>iM
`|v/qk7
^?
/* z;/8R7L&
* CountData.java D6fd(=t1Z
* 'qG-)2
t
* Created on 2007年1月1日, 下午4:44 ox\D04:M
* R>&8%%#
* To change this template, choose Tools | Options and locate the template under \L}7.fkb8
* the Source Creation and Management node. Right-click the template and choose l,3,$
* Open. You can then make changes to the template in the Source Editor. R[*n3
wB
*/ !g)rp`?
r1}1lJ>7H
package com.tot.count; h qhX
2 J3/Eu
/** i]4n YYS
* ~J5B?@2hK
* @author H;q[$EUNb
*/ ]n"U])pJd
public class CountBean { ( *K)D$y
private String countType; b5KK0Jjk
int countId; to1r
88X
/** Creates a new instance of CountData */ l[%=S!
public CountBean() {} Lp4F1H2t-
public void setCountType(String countTypes){ lOe|]pQ.,
this.countType=countTypes; P*U^,Jh<
} IGlyx'\_
public void setCountId(int countIds){ Y" rODk1
this.countId=countIds; ZSD7%gE<D
} oQ*LP{M
public String getCountType(){ tGbx/$Y
return countType; voTP,R[}85
} [f[Wz{Q#Y
public int getCountId(){ !"-.D4*r
return countId; iTT%_-X-
} %""h:1/S
} OjG`s-91&
} *C
CountCache.java vM$hCV~N
>,_0Mem2Rr
/* 8$Zwk7 w8A
* CountCache.java m~P30)
* =w"Kkj>%oh
* Created on 2007年1月1日, 下午5:01 /;[x3}[
* Q7d@+C
* To change this template, choose Tools | Options and locate the template under 5v`lCu]
* the Source Creation and Management node. Right-click the template and choose 8K8jz9.s
* Open. You can then make changes to the template in the Source Editor. EgbH{)u
*/ _Y}cK|3
ro3%VA=V
package com.tot.count; #N~1Ye
import java.util.*; nG{o$v_|
/** 5~im.XfiVx
* 0 VG;z#{J
* @author @0NWc
c+
*/ nII#uI/!q
public class CountCache {
]w$cqUhM
public static LinkedList list=new LinkedList(); \d]Y#j<
/** Creates a new instance of CountCache */ 2m*/$GZ
public CountCache() {} x'OP0],#
public static void add(CountBean cb){ C+%eT&OO
if(cb!=null){ q"DHMZB
list.add(cb); dxH\H?NO
} x(4"!#
} V[WLS ?-)
} %W=BdGr[8z
X=lsuKREZ
CountControl.java i3d2+N`
0w< ilJ
/* sX3qrRY
* CountThread.java L$+_
* ZitmvcMk
* Created on 2007年1月1日, 下午4:57 ~ISY( &
* :xbj&
l
* To change this template, choose Tools | Options and locate the template under =YfzB!ld
* the Source Creation and Management node. Right-click the template and choose j(K)CHH
* Open. You can then make changes to the template in the Source Editor. FUJ<gqL
*/ rwio>4=
$/@
L
package com.tot.count; !y>up+cRjl
import tot.db.DBUtils; 4i}nk
T
import java.sql.*; B*Om\I
/** vW!O("\7K<
* W,H=K##6<
* @author 'Nuy/\[{\
*/ P{:Z xli0
public class CountControl{ w:iMrQeJg
private static long lastExecuteTime=0;//上次更新时间 r ?<kWR?w
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Gr)G-zE
/** Creates a new instance of CountThread */ \&ZEIAe
public CountControl() {} j8PeO&n>
public synchronized void executeUpdate(){ !>=lah$&
Connection conn=null; U /~uu
PreparedStatement ps=null; q8;MPXSG3
try{ 4`fV_H.8
conn = DBUtils.getConnection(); k'PvQl"I
conn.setAutoCommit(false); a^E>LJL
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Sl'$w4s
for(int i=0;i<CountCache.list.size();i++){ eOkiB!G.
CountBean cb=(CountBean)CountCache.list.getFirst(); nHQ*#&$
CountCache.list.removeFirst(); .XRe:\8mc
ps.setInt(1, cb.getCountId()); i_l{#*t
ps.executeUpdate();⑴ Gm9
//ps.addBatch();⑵ 9ZatlI,
} v6[VdWOx5
//int [] counts = ps.executeBatch();⑶ fo`R=|L[
conn.commit(); , /jHhKW
}catch(Exception e){ 5JK'2J&
e.printStackTrace(); %g89eaEZ
} finally{ ja/wI'J<
try{ eH!V%dX
if(ps!=null) { {D :WXvI
ps.clearParameters(); !<VP[%2L~
ps.close(); 2Ub-ufkU
ps=null; Li0+%ijM
} \/gf_R_GN
}catch(SQLException e){} bb\XZ~)F
DBUtils.closeConnection(conn); v&7<f$5
} 8 4reyA
} .3XiL=^~Qp
public long getLast(){ rnp; R
return lastExecuteTime; /0Qo(
} *O @Zn
public void run(){ !b4AeiL>w
long now = System.currentTimeMillis(); @,;h!vB*=
if ((now - lastExecuteTime) > executeSep) { m|x_++3
//System.out.print("lastExecuteTime:"+lastExecuteTime); :hW(2=%
//System.out.print(" now:"+now+"\n"); tX@y ]"
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); _T~&kwe
lastExecuteTime=now; VAUd^6Xdwx
executeUpdate(); I>vU;xV\m
} ggkz
fg &
else{ u^c/1H:6
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 2G!z/OAj
} 9HiyN>(
} ;lrO?sm
} CR2.kuM0~
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 G %\/[
B
&DHIYj1 i
类写好了,下面是在JSP中如下调用。 P2iuB|B@
P$N5j~*
<% @qjN>PH~
CountBean cb=new CountBean(); c;-NRvVb
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); *B{]
CountCache.add(cb); 0T#z"l<L
out.print(CountCache.list.size()+"<br>"); ,_w}\'?L
CountControl c=new CountControl(); *P]]7DR
c.run(); .d$Q5Qae
out.print(CountCache.list.size()+"<br>"); '@w'(}3!3R
%>