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: L6A6|+H%E
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CountBean.java Cm;N5i
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/* m&A/IW,.
* CountData.java a*IJ)'S
* BkqIfV%O
* Created on 2007年1月1日, 下午4:44 BS|-E6E<
* |_=jXf\TL
* To change this template, choose Tools | Options and locate the template under @xkM|N?
* the Source Creation and Management node. Right-click the template and choose 329xo03-[
* Open. You can then make changes to the template in the Source Editor. )sS<%Xf
*/ 5^d%+*l;q
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package com.tot.count; }5] s+m
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/** Om1z
* <0LB]zDWe6
* @author 7R2)Klt
*/ s{:
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public class CountBean { 4*9Dh
private String countType; 25~$qY_
int countId; B6pz1P?e}
/** Creates a new instance of CountData */ ``E;!r="v
public CountBean() {} mpF_+Mn
public void setCountType(String countTypes){ BA>0
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this.countType=countTypes; |(H|2]b4=
} %!$-N!e
public void setCountId(int countIds){ \S@A
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this.countId=countIds; bT*4Qd4W
} s,29_z7
public String getCountType(){ yR$_$N+E
return countType; FXSDN268
} aw4+1.xy
public int getCountId(){ P3
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return countId; y;>I'e
} ]`kvq0Gyb
} jbGH3 L
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CountCache.java w:LCm `d
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/* >>8w(PdTn%
* CountCache.java <EUSl|6
* }2.}fHb2
* Created on 2007年1月1日, 下午5:01 PmY:sJ{M
* 2&d&$Jg
* To change this template, choose Tools | Options and locate the template under %Uk/P
* the Source Creation and Management node. Right-click the template and choose U; xWW9
* Open. You can then make changes to the template in the Source Editor. :V2Q n-N
*/ d&u/7rm
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#
package com.tot.count; yfW^wyDd2o
import java.util.*; j)DZmGg&t
/** <`*P/V
* Os!22 O
* @author kC5,yj
*/ 614/wI8(
public class CountCache { /#=J`*m_
public static LinkedList list=new LinkedList(); 8'[wa
/** Creates a new instance of CountCache */ -YyH"f
public CountCache() {} &NQR*Tn
public static void add(CountBean cb){ l1qwT0*6>
if(cb!=null){ 9GwsQ \
list.add(cb); 15:@pq\
} =eoxT
} j1C.#-P[
} Umt ia~x=&
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CountControl.java EM/+1
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/* @<=#i
* CountThread.java Kc\'s65.]
* ;T+U&U0d|
* Created on 2007年1月1日, 下午4:57 ZcRm5Du~:
* ejY5n2V#=
* To change this template, choose Tools | Options and locate the template under $)]FCuv
* the Source Creation and Management node. Right-click the template and choose Ur(o&,
* Open. You can then make changes to the template in the Source Editor. Le
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*/ @qy*R'+
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package com.tot.count; aQ:f"0fL
import tot.db.DBUtils; -*fYR#VQQB
import java.sql.*; O9X:1>a@i
/** C(HmLEB^
* $
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* @author pNQkKDbL+
*/ #
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public class CountControl{ :_a]T-GL
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]U1,NhZu
/** Creates a new instance of CountThread */ ]"g >> N
public CountControl() {} gNN"
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public synchronized void executeUpdate(){ PZ(<eJ>
Connection conn=null; 9Pp|d"6]y
PreparedStatement ps=null; +()t8,S,
try{ *F*jA$aY
conn = DBUtils.getConnection(); |kNGpwpI
conn.setAutoCommit(false); )B$P#dP)i
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); A=C3e4.C
for(int i=0;i<CountCache.list.size();i++){ i!$^NIcJ
CountBean cb=(CountBean)CountCache.list.getFirst(); q+n1~AT
CountCache.list.removeFirst(); LZC?383'
ps.setInt(1, cb.getCountId()); za]p,bMX
ps.executeUpdate();⑴ }R&5qpl
//ps.addBatch();⑵ .!8X]trEg
} n`z+ w*
//int [] counts = ps.executeBatch();⑶ J1p75c%
conn.commit(); u1{ym_
}catch(Exception e){ U%t/wq
e.printStackTrace(); <h_P+ nz
} finally{ a950M7
try{ DGZY~(]
if(ps!=null) { /4
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ps.clearParameters(); sK%Hx`
ps.close(); }t51U0b%
ps=null; ~d%;~_n
} G(0y|Eq
}catch(SQLException e){} ]AA%J@
DBUtils.closeConnection(conn); 5nx<,-N*BP
} n1>,#|#
} 2>}\XKF).
public long getLast(){ 4iv]N 4
return lastExecuteTime; fQ36Hd?(5
} M=AvD(+ha
public void run(){ /Fo/_=FE 2
long now = System.currentTimeMillis(); .K@x4
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if ((now - lastExecuteTime) > executeSep) { ~`\9Q
//System.out.print("lastExecuteTime:"+lastExecuteTime); ^5^}MB%
//System.out.print(" now:"+now+"\n"); r[v-?W'
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 8_IOJ]:w
lastExecuteTime=now; G?ugMl}
executeUpdate(); B80odU&
} Q-`{PJ(p
else{ `B'4"=(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); $,;S\JmWP
} .'S^&M/$
} (H8C\%g:
} \+{t4Im
//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 !b7'>b'J<1
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类写好了,下面是在JSP中如下调用。 {M@@)27gW
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<% 8jjFC9Cbn0
CountBean cb=new CountBean(); |)-|2cPRur
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); w#xeua|*I#
CountCache.add(cb); B [+(r
out.print(CountCache.list.size()+"<br>"); ,!I?)hwOC
CountControl c=new CountControl(); o9ctJf=qn
c.run(); Ak6MPuBB-
out.print(CountCache.list.size()+"<br>"); ^`rpf\GX(
%>