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: ic:zsuEm
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CountBean.java s S+MqBh&I
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/* =jN.1}
* CountData.java b=C*W,Q_#
* zpn9,,~u
* Created on 2007年1月1日, 下午4:44 ,>a&"V^k
* fgTg7 m
* To change this template, choose Tools | Options and locate the template under ^e,.
* the Source Creation and Management node. Right-click the template and choose RNk\.}m
* Open. You can then make changes to the template in the Source Editor. k t#fMd$
*/ u[;\y|75
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package com.tot.count; 0D.Mke )
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/** c^xIm'eob
* I9A~Ye
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* @author P8:dU(nlW
*/ $S6`}3
public class CountBean { s[>,X#7 y
private String countType; XT%nbh&y
int countId; C^Yb\N}S
/** Creates a new instance of CountData */ -m zIT4
public CountBean() {} tU5zF.%
public void setCountType(String countTypes){ #lo6c;*m5
this.countType=countTypes; KfEx"94
} 0],r0
public void setCountId(int countIds){ NG=-NxEcN
this.countId=countIds; :`#d:.@]o@
} #P9~}JB3,
public String getCountType(){ )u&|_&g{}J
return countType; d'gfQlDny
} nF]W,@u"h
public int getCountId(){ NN{?z!
return countId; yPBZc h %-
} .NC!7+1m
} s]0{a.Cpv
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CountCache.java Dj?> <@
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/* $99n&t$Y
* CountCache.java `{h*/Q
*
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* Created on 2007年1月1日, 下午5:01 m])y.T
* iq8<ov
* To change this template, choose Tools | Options and locate the template under ;4\2.*s
* the Source Creation and Management node. Right-click the template and choose ub0.J#j@
* Open. You can then make changes to the template in the Source Editor. ?zMHP#i
*/ <NY^M!
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package com.tot.count; fplo w
import java.util.*; ys^oG$lq
/** Lg+Ac5y}`
* +) om^e@.
* @author qA7>vi%
*/ k"%~"9
public class CountCache { K7B/s9/xs
public static LinkedList list=new LinkedList(); |Zpfq63W
/** Creates a new instance of CountCache */ *;slV3
public CountCache() {} (,\+tr8r8
public static void add(CountBean cb){ `?rSlR@+[I
if(cb!=null){ U}[d_f
list.add(cb); NNR`!Pty
} qr^3R&z!}
} xt*
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} P1 8hxXE3
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CountControl.java f}ji?p
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/* M)+H{5bt
* CountThread.java /Iy]DU8
* SM#]H-3
* Created on 2007年1月1日, 下午4:57 !Pvf;rNI1T
* gfd"v
* To change this template, choose Tools | Options and locate the template under g)[V(yWu
* the Source Creation and Management node. Right-click the template and choose *%NT~C
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* Open. You can then make changes to the template in the Source Editor. /t57!&
*/ ~H_/zK6e
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package com.tot.count; =:Fc;n>c<K
import tot.db.DBUtils; Fnv;^}\z
import java.sql.*; }eU*(
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/** x /S}Q8!"}
* sf
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* @author \ a<h/4#|
*/ k,6f
public class CountControl{ jD]~ AwRJ
private static long lastExecuteTime=0;//上次更新时间 N^G
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]@c+]{
/** Creates a new instance of CountThread */ A RuA<vQ
public CountControl() {}
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public synchronized void executeUpdate(){ sqwGsO$#
Connection conn=null; jXx<`I+]
PreparedStatement ps=null; Yui3+}Ms
try{ rQs)O<jl
conn = DBUtils.getConnection(); 8 +/rlHp
conn.setAutoCommit(false); (0r3/t?DQ
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); L.2^`mZs
for(int i=0;i<CountCache.list.size();i++){ ZohCP
CountBean cb=(CountBean)CountCache.list.getFirst(); _ QI\
CountCache.list.removeFirst(); z+wA
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ps.setInt(1, cb.getCountId()); G@\1E+Ip
ps.executeUpdate();⑴ &j`} vg
//ps.addBatch();⑵ ".V$~n(
} k68T`Ub\W6
//int [] counts = ps.executeBatch();⑶ d#Y^>"|$.
conn.commit(); rSk>
}catch(Exception e){ 29"'K.r
e.printStackTrace(); W~;`WR;.
} finally{ Lc,Pom
try{ ~9]hV7y5C
if(ps!=null) { w~A{(-
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ps.clearParameters(); Dlae;5D
ps.close(); X6X
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ps=null; )gIKH{JYL
} 0B/,/KX
}catch(SQLException e){} Su7?;Oh/yI
DBUtils.closeConnection(conn); $\BE&4g
} S(I{NL}=$
} ]EBxl=C}D
public long getLast(){ .-c4wm}
return lastExecuteTime; =E4LRKn
} u#$]?($}d
public void run(){ Y|f[bw
long now = System.currentTimeMillis(); <tNBxa$gS
if ((now - lastExecuteTime) > executeSep) { Qf+\;@
//System.out.print("lastExecuteTime:"+lastExecuteTime); y/cvQY0pU
//System.out.print(" now:"+now+"\n"); c
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ?k&Vy
lastExecuteTime=now; -q1??u
executeUpdate(); @Z
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} Y0@"fU35
else{ GqvpA#
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); '&tG?gb&
} zuad~%D<I
} T{.pM4Hd
} ?m}s4a
//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 3>AMII
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类写好了,下面是在JSP中如下调用。 `l
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CountBean cb=new CountBean(); z6=Z\P+
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Oi'5ytsES
CountCache.add(cb); _[c0)2h
out.print(CountCache.list.size()+"<br>"); =JEv,ZGT3
CountControl c=new CountControl(); 6:[dj*KGmT
c.run(); VU(v3^1"
out.print(CountCache.list.size()+"<br>"); fI}to&qk
%>