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: x7=5 ;gf/X
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CountBean.java W`KRaL0^
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/* 8pfQAzl
* CountData.java ZS@Cd9*
* MXbt`]`_
* Created on 2007年1月1日, 下午4:44
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* !`yg bI.
* To change this template, choose Tools | Options and locate the template under 3rEBG0cf]
* the Source Creation and Management node. Right-click the template and choose :6 ?&L
* Open. You can then make changes to the template in the Source Editor. u~,@Zg87
*/ fCL5Et
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package com.tot.count; i6p0(OS&D
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/** FL+^r6DQ
*
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* @author fD#VI
*/ piE9qXn
public class CountBean { W[]N.d7G
private String countType; gu[3L
int countId; 0i2ZgOJ
/** Creates a new instance of CountData */ DbdxHuKa>
public CountBean() {} cCd2f>EHw
public void setCountType(String countTypes){ \Ze"Hv
this.countType=countTypes; 8kz7*AO
} d`U{-?N>
public void setCountId(int countIds){ xA DjQ%B
this.countId=countIds; y5L%_
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} ?3wEO>u
public String getCountType(){ V/Q~NXN
return countType; \lVxlc0{?
} H1H+TTZr
public int getCountId(){ *_puW
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return countId; &}P{w
} %,-oxeM1u
} ^w eU\
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CountCache.java iEG`+h'
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/* )6# i>c-
* CountCache.java 8'Eu6H&$G
* -v *wT*I1
* Created on 2007年1月1日, 下午5:01 &<Bx1\ ~V
* 0Bx.jx0?
* To change this template, choose Tools | Options and locate the template under ^1rw\Zp
* the Source Creation and Management node. Right-click the template and choose ,
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* Open. You can then make changes to the template in the Source Editor. 6vrMR&#a
*/ Dz4fP;n
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package com.tot.count;
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import java.util.*; zT[[WY4
/** :^+ aJ]
* K8{U b
* @author tkBp?Wl
*/ LHjGlBy
public class CountCache { \vVGfG?6
public static LinkedList list=new LinkedList(); v:c_q]z#B
/** Creates a new instance of CountCache */ hm=E~wv'L
public CountCache() {} x
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public static void add(CountBean cb){ _@[M0t}g_
if(cb!=null){ PSX-b)wb
list.add(cb); t&+f:)n
} +~Ni7Dp]
} ^lCys
} ?Xscc mN
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CountControl.java c0v;r4Jo#j
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/* J>(I"K%
* CountThread.java <S'5`-&
* L0?-W%$>
* Created on 2007年1月1日, 下午4:57 eqK6`gHa6
* Fv \yhR
* To change this template, choose Tools | Options and locate the template under w)o^?9T
* the Source Creation and Management node. Right-click the template and choose )BR6?C3
* Open. You can then make changes to the template in the Source Editor. RI_:~^nO{r
*/ |EuWzhNAO
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package com.tot.count; ]2kgG*^n"
import tot.db.DBUtils; =vxiqRm
import java.sql.*; [ay~l%x
/** ?ic 7M
* ^J3\
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* @author (,~gY=E+
*/ N5u.V\F!z\
public class CountControl{ f)x^s$H
private static long lastExecuteTime=0;//上次更新时间 ;h>s=D,r
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 W)I)QinOH
/** Creates a new instance of CountThread */ x/Pi#X m
public CountControl() {} 1df}gG
public synchronized void executeUpdate(){ nlaJ
Connection conn=null; E5.3wOE
PreparedStatement ps=null; /an$4?":~
try{ 2fp\s5%J}
conn = DBUtils.getConnection(); GQXN1R
conn.setAutoCommit(false); f.ku v"
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); o:u *E
for(int i=0;i<CountCache.list.size();i++){ :Hdn&a
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CountBean cb=(CountBean)CountCache.list.getFirst(); X(F2 5
CountCache.list.removeFirst(); W]p)}#FR
ps.setInt(1, cb.getCountId()); -g'[1
ps.executeUpdate();⑴ pj. }VF!d
//ps.addBatch();⑵
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} 1A;>@4iC0
//int [] counts = ps.executeBatch();⑶ ;C=C`$Q
conn.commit(); |,c\R"8xS
}catch(Exception e){ :d7Ju.*J
e.printStackTrace(); Ie(vTP1Cj
} finally{ VmM?KlC
try{ w 8M,35b
if(ps!=null) { F;l*@y Tq
ps.clearParameters(); xh[De}@
ps.close(); 5 3=zHYQ
ps=null; {e4`D1B
} :4]^PB@dl
}catch(SQLException e){} '1]Iu@?
DBUtils.closeConnection(conn); fI@4 v\
} &UtsI@Mu
} {f;]
public long getLast(){ J8[N!qDCj
return lastExecuteTime; )0Av:eF-+
} 2Uf]qQ1
public void run(){ ,TY&N-
long now = System.currentTimeMillis(); B.nq3;Y
if ((now - lastExecuteTime) > executeSep) { rJ)O(
//System.out.print("lastExecuteTime:"+lastExecuteTime); )N!-g47o%#
//System.out.print(" now:"+now+"\n"); ]Z?$ 5Ks
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); z>$AZ>t%J$
lastExecuteTime=now; K@u\^6419
executeUpdate(); Yoy}Zdu}h
} S^;D\6(r
else{ A;E7~qOG
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Y@'ug N|[C
} l
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} Q%6Lc.i
} Ht.0ug
//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 >q0c!,Ay
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类写好了,下面是在JSP中如下调用。 [ix45xu7
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<% |7XV!D!\g
CountBean cb=new CountBean(); hawE2k0p(
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); S~auwY ,<
CountCache.add(cb); w@U`@})r.
out.print(CountCache.list.size()+"<br>"); };%l <Ui;
CountControl c=new CountControl(); FFGG6r
c.run(); _U<sz{6
out.print(CountCache.list.size()+"<br>"); NsYeg&>`
%>