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: 5yy:JTAH5
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CountBean.java DmiBM6t3N
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/* 0CrsZt X
* CountData.java p~qe/
* Z'JS@dV
* Created on 2007年1月1日, 下午4:44 k"(]V
* 0M_oFx
* To change this template, choose Tools | Options and locate the template under x<NPp&GE
* the Source Creation and Management node. Right-click the template and choose BX@Iq
* Open. You can then make changes to the template in the Source Editor. Tu#< {'1$
*/ <\aeC2~M
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package com.tot.count; XIHN6aQ{X
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/** -Aj)<KNx[
* (\9`$
* @author V#t_gS
*/ X
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public class CountBean { "ZuuSi
private String countType; &XP(D5lf`B
int countId; Bh>L"'.2
/** Creates a new instance of CountData */ %@/^UE:
public CountBean() {} J-F".6i5
public void setCountType(String countTypes){ jVj5 ; }
this.countType=countTypes; XIeLu"TSL
} ~Iu! B
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public void setCountId(int countIds){ ^:eZpQ [,
this.countId=countIds; ;;Q^/rkC
} )O]T}eI
public String getCountType(){ WSkGVQu
return countType; =l,P'E
} 0B
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public int getCountId(){ xt{'Be&Ya+
return countId; H",B[
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} _'u]{X\k{J
} tZrc4$D-
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CountCache.java Lsmcj{1d
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/* J3K=z
* CountCache.java RgE`H r
* "/#JC}]
* Created on 2007年1月1日, 下午5:01 tT$OnZu&
* l\HdB"nT
* To change this template, choose Tools | Options and locate the template under aER|5!7(2\
* the Source Creation and Management node. Right-click the template and choose 9(CvGzco<
* Open. You can then make changes to the template in the Source Editor. |y\Km
*/ (!os&/",
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package com.tot.count; 5Wt){rG0Z
import java.util.*; pm&THd
/** Ac7^JXh%
* kX 1}/l
* @author IUcL*
*/ NWBYpGZx
public class CountCache { GXNf@&
public static LinkedList list=new LinkedList(); [|u^:&az
/** Creates a new instance of CountCache */ 8sG3<$Z^
public CountCache() {} $Gn.G_"v
public static void add(CountBean cb){ n\#YGL<n
if(cb!=null){ 29R-Up!SVN
list.add(cb); WL$^B@gXQ
} INZVe(z
} yqK4 "F&
} qfkHGW?1/j
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CountControl.java Pf?kNJ*Tv)
*dzZOe>,
/* E*_^+ %
* CountThread.java ));#oQol9
* 5sD,gZ7
* Created on 2007年1月1日, 下午4:57 =lXj%V^8N
* ?0tg}0|
* To change this template, choose Tools | Options and locate the template under da{]B5p\
* 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. s:`i~hjq
*/ 85{m+1O~
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package com.tot.count; G4&s_M$
import tot.db.DBUtils; DA=U=F
import java.sql.*; W+nu=iQ!
/** r );R/)&
* /Y Kd [RQ
* @author 9N]Xa
*/ 7*'/E#M
public class CountControl{ MfTLa)Rz
private static long lastExecuteTime=0;//上次更新时间 #c!:&9oU
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Nz{dnV{&x;
/** Creates a new instance of CountThread */ rCyb3,W
public CountControl() {} aD/Rr3v>
public synchronized void executeUpdate(){ E$d3+``
Connection conn=null; FoefBo?g65
PreparedStatement ps=null; HDyf]2N*N
try{ -DDA b(2*
conn = DBUtils.getConnection(); xVvUx,t
conn.setAutoCommit(false); 0oe<=L]F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); .{Y;6]9[
for(int i=0;i<CountCache.list.size();i++){ ]wQ!ZG?)
CountBean cb=(CountBean)CountCache.list.getFirst(); v1h(_NLI!
CountCache.list.removeFirst(); sE9FT#iE
ps.setInt(1, cb.getCountId()); ~m%[d.
}e
ps.executeUpdate();⑴ F c[KIG3@
//ps.addBatch();⑵ IS C.~q2
} B.<SC
//int [] counts = ps.executeBatch();⑶ ~PQ.l\C
conn.commit(); NGra/s,9|
}catch(Exception e){ ~{c ?-qb
e.printStackTrace(); ]5W$EvZ9)
} finally{ lwnO
try{ ;#B(L=/
if(ps!=null) { I8*VM3
ps.clearParameters(); myx/ |-V"F
ps.close(); !Jg;%%E3:i
ps=null; _iwG'a[`
} ]{-.?W*$
}catch(SQLException e){} aCQtE,.
DBUtils.closeConnection(conn); NgNGq\!
} _8K+iqMZG
} z,HhSW?&^
public long getLast(){ a|ft l&uk
return lastExecuteTime; KaIKb=4L|
} e~h>b.~
public void run(){ F[qXIL)
long now = System.currentTimeMillis(); t2&kGf"
if ((now - lastExecuteTime) > executeSep) { :WhJDx`j
//System.out.print("lastExecuteTime:"+lastExecuteTime); }v1wpv/b(
//System.out.print(" now:"+now+"\n"); >DL
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pjl%Jm
lastExecuteTime=now; FU|brSt
executeUpdate(); npP C;KD
} !U`&a=k
else{ PSrx!
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); &\zYbGU
} F<4rn
} ,"qCz[aDN1
} "EW8ll7r
//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 M,Gy.ivz
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类写好了,下面是在JSP中如下调用。 [hJ1]RW8
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<% 01bCP
CountBean cb=new CountBean(); $Dg-;I
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); n}p G&&;q
CountCache.add(cb); NW|B|kc
out.print(CountCache.list.size()+"<br>"); e8a^"Z`a
CountControl c=new CountControl(); 6(|mdk`i
c.run(); ?2<QoS
out.print(CountCache.list.size()+"<br>"); ",r
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