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: *0<)PJ T
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CountBean.java 6wZ)GLW[
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/* `^h:}V
* CountData.java /+m2|Ij(
* 0:B%,nUM
* Created on 2007年1月1日, 下午4:44 Sar1NkD#
* .=9d3uWJ/
* To change this template, choose Tools | Options and locate the template under 4`")aM
* the Source Creation and Management node. Right-click the template and choose S,vdd7Y
* Open. You can then make changes to the template in the Source Editor. rCb#E}
*/ (D{J|
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package com.tot.count; 0!tuUn
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/** ACpecG
* QuC_sFP10
* @author _7dp(R
*/ ,,lR\!>8
public class CountBean { "CZv5)
private String countType; M;YJpi
int countId; 32`Z3-
/** Creates a new instance of CountData */ flOXV
public CountBean() {} R]0`-_T
public void setCountType(String countTypes){ Zx7aae_{
this.countType=countTypes; (;-_j/
} v 7%}ey[
public void setCountId(int countIds){ J|<C;[du>
this.countId=countIds; zMd><UQP{
} 8]rObT9>
public String getCountType(){ RF~G{wz
return countType; "/ Gw`^t
} c:<a"$
public int getCountId(){ DhD##5a
return countId; <5}j(jxz}
} : t/0
} 4&v&XLkb
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CountCache.java *p9k> )'J
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/* 0|8cSE<
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* CountCache.java D|^N9lDaQ
* G2-0r.f
* Created on 2007年1月1日, 下午5:01 m!=5Q S3Z
* 0Gu?;]GSv
* To change this template, choose Tools | Options and locate the template under k"%sdYkb!
* the Source Creation and Management node. Right-click the template and choose >qmNT/
* Open. You can then make changes to the template in the Source Editor. G\^<MR|
*/ O- LwX
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package com.tot.count; '`f+QP=`
import java.util.*; C
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/** fzvyR2 I
* OXn-!J90P
* @author #rNc+
*/ UT[{NltH
public class CountCache { (]PH2<3t
public static LinkedList list=new LinkedList(); ;'
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/** Creates a new instance of CountCache */ s)KlKh
public CountCache() {} 4t3>`x
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public static void add(CountBean cb){ ^YB2E*
if(cb!=null){ }Z<Sca7
list.add(cb); @AK&R~<
} @]p{%" $
} ~$hR:I1
} .?LRt
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CountControl.java ?e,:x ]\L
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/* W1Ye+vg/s
* CountThread.java yO,Jgn
* 1}+b4"7]
* Created on 2007年1月1日, 下午4:57 AlkHf]oB
* N">#fYix
* To change this template, choose Tools | Options and locate the template under oK$Krrs0&
* the Source Creation and Management node. Right-click the template and choose ]'w5s dP
* Open. You can then make changes to the template in the Source Editor. V`HnFAW
*/ kk4+>mk
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package com.tot.count; 5(E&jKn&
import tot.db.DBUtils; 4jZB%tH
import java.sql.*; 4^ U%` 1
/** c]bG5
* ]lqZ9rO
* @author OhlK;hvdB*
*/ gsl_aW!
public class CountControl{ ;%^{Zybh
private static long lastExecuteTime=0;//上次更新时间 jzBW'8
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _*b`;{3
/** Creates a new instance of CountThread */ leI ]zDk=
public CountControl() {} %~8f0B|im
public synchronized void executeUpdate(){ E> $_
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Connection conn=null; pZ3sp!
PreparedStatement ps=null; He}?\C
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try{ [-\U)>MY(p
conn = DBUtils.getConnection(); ^ meU&
conn.setAutoCommit(false); 96J]g*o(uU
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Lo5pn
for(int i=0;i<CountCache.list.size();i++){ USHQwn)%
CountBean cb=(CountBean)CountCache.list.getFirst(); d2^/
CountCache.list.removeFirst(); K_-m:P
ps.setInt(1, cb.getCountId());
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ps.executeUpdate();⑴ H)EL0
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//ps.addBatch();⑵ GIn%yB'
} *X ;ch55\
//int [] counts = ps.executeBatch();⑶ u0G
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conn.commit(); &m
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}catch(Exception e){ x'..j5
e.printStackTrace(); %Lb
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} finally{ \NEk B&^n
try{ )+=Kh$VbS
if(ps!=null) { 7Z<GlNv
ps.clearParameters(); MNb9 ~kM
ps.close(); $5&~gHc,
ps=null; $ #2<f 6
} FQ`1c[M@
}catch(SQLException e){} "Z;({a$v
DBUtils.closeConnection(conn); mH4u@aQ}
} HavlN}h
} q-uzu !
public long getLast(){ "@/pQoLy
return lastExecuteTime; `~"'\Hw
} v ?}0h5
public void run(){ $xq04ejJ
long now = System.currentTimeMillis(); OLm@-I*
if ((now - lastExecuteTime) > executeSep) { n;$u%2 t2
//System.out.print("lastExecuteTime:"+lastExecuteTime); yWE\)]9
//System.out.print(" now:"+now+"\n"); D
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); /!A"[Tyt
lastExecuteTime=now; MPy><J
executeUpdate(); `Syfl^9B
} 4z26a
else{ ~J>;l
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); BHYguS^qz
} }Nwp{["}]L
} vw(ecs^C
} + G[zE
//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 ZH8 w^}
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类写好了,下面是在JSP中如下调用。 ^FBu|eAkE
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<% ksuePMIK
CountBean cb=new CountBean(); tcsb]/my
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); gsM^Pu09ud
CountCache.add(cb); |G$-5
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out.print(CountCache.list.size()+"<br>"); 6w{_+=T
CountControl c=new CountControl(); fjl9*
c.run(); ->.9[|lIg
out.print(CountCache.list.size()+"<br>"); ",Vx.LV
%>