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: Bp=oTCG
{8*d;[X50
CountBean.java _taHf %\4
`K@df<}%*,
/* kL2Zr
* CountData.java '!r+Tz
* Jfixm=.6
* Created on 2007年1月1日, 下午4:44 }
Khq
* \h'E5LO
* To change this template, choose Tools | Options and locate the template under +cE tm
* the Source Creation and Management node. Right-click the template and choose 67KRM(S
* Open. You can then make changes to the template in the Source Editor. 9$\;voo
*/ Gn2bZ%l
&ttv4BC^r
package com.tot.count; ^!v}
XYxm8ee"j
/** s&QBFyKtJ
* &Curvc1fm
* @author 7KSGG1ts
*/ n'&`9M['%d
public class CountBean { W2W2WyPk
private String countType; HN~v&,
int countId; 9qu24zz$P
/** Creates a new instance of CountData */ /v;)H#;
public CountBean() {} bCaPJ!ZO
public void setCountType(String countTypes){ 4HJZ^bq9|
this.countType=countTypes; +DbWMm
} kUaGok?
public void setCountId(int countIds){ mC[U)` ey
this.countId=countIds; 9Qs"X7iH
} tci%=3,)
public String getCountType(){ HC;I0&v>
return countType; 8t*%q+Z
} 5w [=
public int getCountId(){ mB|mt+
return countId; M_e$l`"G
} :(?hLH.W[
} ,Q /nS$
$bi_i|?
CountCache.java D@4&@>
,;=( )-
/* <@AsCiQF
* CountCache.java ,wb|?>Y
* fj
t_9-.
* Created on 2007年1月1日, 下午5:01 $ DZQdhv
*
1N$gE
* To change this template, choose Tools | Options and locate the template under ]Re~V{uh
* the Source Creation and Management node. Right-click the template and choose b]g&rwXYt
* Open. You can then make changes to the template in the Source Editor. t+4Y3*WeGF
*/ (HrkUkw
N5 rG.6K
package com.tot.count; mTuB*
import java.util.*; E][{RTs
/** N>nvt.`P
* >&TnTv?I
* @author 4xpWO6Q
*/ z)Q^j>%
public class CountCache { 3!oQmG_T
public static LinkedList list=new LinkedList(); ^tKOxW#
a
/** Creates a new instance of CountCache */ ?#EXG
public CountCache() {} J"2ODB5"
public static void add(CountBean cb){ I\uB"Z{9
if(cb!=null){ ?"8A^
^
list.add(cb); WO(&<(?
} q[|`&6B
} 3Llj_lf
} Zqs-I8y
L]}RSE2
CountControl.java 2bn@:71`
">vYEkZ3
/* k@";i4}A
* CountThread.java Rn~Xu)@e
* ME10dr
* Created on 2007年1月1日, 下午4:57 yDkDtO`K
* aEqI51I
* To change this template, choose Tools | Options and locate the template under n40MP5RxY
* the Source Creation and Management node. Right-click the template and choose lKhh=Pc2
* Open. You can then make changes to the template in the Source Editor. SX=0f^
*/ <sCq
x/L
!E:Vn *k;
package com.tot.count; %Rsf6rJ
import tot.db.DBUtils; =Wy`X0h
import java.sql.*; !
7*_Z=
/** J_[[BJ&}x
* ]zq_gV8k
* @author Nj-rZ%&
*/ c.{&~
public class CountControl{ h. (;GJO
private static long lastExecuteTime=0;//上次更新时间 ;7n*PBUJJ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 $t
H.np
/** Creates a new instance of CountThread */ B?ob{K@
public CountControl() {} PUZXmnB
public synchronized void executeUpdate(){ .SV3<)
Connection conn=null; pn%|;
PreparedStatement ps=null; s^?sJUj
try{ qD%&\ZT
conn = DBUtils.getConnection(); -b>O4_N
conn.setAutoCommit(false); b}L,kT
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); %FWfiFV|<
for(int i=0;i<CountCache.list.size();i++){ (F
'
CountBean cb=(CountBean)CountCache.list.getFirst(); 8~Hs3\Hp
CountCache.list.removeFirst(); )>M@hIV5>
ps.setInt(1, cb.getCountId()); '-]BSU
ps.executeUpdate();⑴ qddT9U|8~
//ps.addBatch();⑵ 8!%"/*P$
} ~W *j^+T"
//int [] counts = ps.executeBatch();⑶ &aAo:pj
conn.commit(); ,Ho.O7H
}catch(Exception e){ I.0P7eA-
e.printStackTrace(); ;$L!`"jn
} finally{ >\.[}th}
try{ jKV?!~/F
if(ps!=null) { U6'haPlOk%
ps.clearParameters(); PM<LR?PLc
ps.close(); U4L=3T+:[
ps=null; V1 #aDfiW
} ecZOX$'5
}catch(SQLException e){} Ww
tQ>'R"
DBUtils.closeConnection(conn); XhD fI
&
} MirBJL
} 8Gg/M%wq9U
public long getLast(){ ZUJOBjb`
K
return lastExecuteTime; RowiSW
} g7LW?Ewr
public void run(){ ,Ve@=<
long now = System.currentTimeMillis(); LP-Q'vb<=
if ((now - lastExecuteTime) > executeSep) { z(X6%p0
//System.out.print("lastExecuteTime:"+lastExecuteTime); j"sO<Q{6%
//System.out.print(" now:"+now+"\n"); N5Mz=UgB
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); yW(+?7U
lastExecuteTime=now; ZpctsCz]
executeUpdate(); J'c9577$
} 5"~^;O
else{ 5
^z ,'C
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); $(L7/M
} Hpg;?xAT
} 71&+dC
} gG;W:vR}l
//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 to|9)\
RZh)0S>J
类写好了,下面是在JSP中如下调用。 NP'DuzC
4"(zi5`e
<% Dj.+5f'
CountBean cb=new CountBean(); "s<lLgi
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); []3}(8yxGb
CountCache.add(cb); v!h-h&p O7
out.print(CountCache.list.size()+"<br>"); UBHQzc+,
CountControl c=new CountControl(); GFa/9Bi
c.run(); <slq1
out.print(CountCache.list.size()+"<br>"); Tn-]0hWkP
%>