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: (%6fZ
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CountBean.java V'b4wO1RV
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/* ~JRq :
* CountData.java ;Qt%>Uo8
* @CM5e!
* Created on 2007年1月1日, 下午4:44 KEy8EB
* 5Y;&L!T
* To change this template, choose Tools | Options and locate the template under /\e_B6pF<
* the Source Creation and Management node. Right-click the template and choose p63fpnH
* Open. You can then make changes to the template in the Source Editor. PC5$TJnj3
*/ gR/?MJ(v
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package com.tot.count; sC"w{_D@*4
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/** otaRA
* ;~1xhpTk
* @author w.rcYywI
*/ Swf%WuDj
public class CountBean { (<.\v@7HC
private String countType; papMC"<g$
int countId; 7Tp+]"bL
/** Creates a new instance of CountData */ fNda&
public CountBean() {} C\{ KB@C\*
public void setCountType(String countTypes){ |A68+(3u
this.countType=countTypes; 3K||(
} 1Y"9<ry
public void setCountId(int countIds){ jjrE8[
this.countId=countIds; ;P'5RCqj
} {.U:Ce
public String getCountType(){ <0Y<9+g!
return countType; K:13t|
} `s69p'<;p
public int getCountId(){ k v_t6 (qd
return countId; {^Q,G x(
} M:.+^.h
} ]*MVC/R,
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CountCache.java ~p'|A}9[/
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/* 4YY!oDN:
* CountCache.java CY':'aWfa<
* s3sD7 @
* Created on 2007年1月1日, 下午5:01 b*tb$F
* Js:U1q
* To change this template, choose Tools | Options and locate the template under Ugo!
* the Source Creation and Management node. Right-click the template and choose k{{
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* Open. You can then make changes to the template in the Source Editor. `
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*/ HS*Y%*
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package com.tot.count; u)zv`m
import java.util.*; tYgHJ~1L*
/** DBGU:V,85
* o;
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* @author !ni
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*/ P
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public class CountCache { ?c8(<_I+
public static LinkedList list=new LinkedList(); ?x 0gI
/** Creates a new instance of CountCache */ $v_&jE
public CountCache() {} n2_;:=
public static void add(CountBean cb){ yIr0D6L
if(cb!=null){ /]0SF_dZ
list.add(cb); 2&pE
} M*cF'go
} FbMtor
} OVxg9
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CountControl.java 0nBDF79
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/* g9;s3qXiG
* CountThread.java MtF^}/0w!`
* =[:E
* Created on 2007年1月1日, 下午4:57 E`xpZ>$mPx
* O> _ F
* To change this template, choose Tools | Options and locate the template under qnQ".
* the Source Creation and Management node. Right-click the template and choose y8C8~ -&OK
* Open. You can then make changes to the template in the Source Editor. i`<L#6RBT
*/ *:+ZEFMq
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package com.tot.count; R'vNJDFY
import tot.db.DBUtils; !?).4yr
import java.sql.*; [+l6x1Am
/** wKpb%3
* KiFTj$w,
* @author )/[L)-~y~
*/ XM"Qs.E
public class CountControl{ j[mII5e7g
private static long lastExecuteTime=0;//上次更新时间 |c2sJy j*
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 x)Zm5&"Gg
/** Creates a new instance of CountThread */ @(*A<2;N
public CountControl() {} 3P>1-=
public synchronized void executeUpdate(){ =_j<x$,b-
Connection conn=null; Al@. KTK
PreparedStatement ps=null; 3*\Q]|SI!
try{ r|]YS6
conn = DBUtils.getConnection(); WrRY3X
conn.setAutoCommit(false); BHU$QX
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /ece}7M
for(int i=0;i<CountCache.list.size();i++){ x)N QRd
CountBean cb=(CountBean)CountCache.list.getFirst(); %CnNu
CountCache.list.removeFirst(); Qv'x+GVW]
ps.setInt(1, cb.getCountId()); }CZw'fhVWO
ps.executeUpdate();⑴
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//ps.addBatch();⑵ 4^YE*6z
} cX4]ViXSr
//int [] counts = ps.executeBatch();⑶ L<iRqayn
conn.commit(); {_L l'S
}catch(Exception e){ G9am}qr
e.printStackTrace(); oD9L5c)
} finally{ ypGt6t(;
try{ CCt\[hl
if(ps!=null) { <s\ZqL$f
ps.clearParameters(); h 6IXD N
ps.close(); fE)o-q6Z
ps=null; 6ce-92n
} hosY`"X
}catch(SQLException e){} T>b"Gj/
DBUtils.closeConnection(conn); f}*:wj
} -&]!ig5v
} l\Ww^
public long getLast(){ D:IG;Rsc
return lastExecuteTime; M=&,+#z<V
} f)a0 !U 44
public void run(){ @OFxnF`
long now = System.currentTimeMillis(); X6(s][Wn
if ((now - lastExecuteTime) > executeSep) { a]%sks
//System.out.print("lastExecuteTime:"+lastExecuteTime); /NiD#s0t
//System.out.print(" now:"+now+"\n"); -])=\n!=
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Fsx<Sa
lastExecuteTime=now; Z^'\()3t
executeUpdate(); E,K>V:P*
} gX-hYQrC
else{ 0b
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); GP %hf{
} 4$ihnb`DQN
} T2.[iD!A
} ITn PF{N
//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 L1DH9wiQi
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类写好了,下面是在JSP中如下调用。 #,6T. O
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<% Ar,n=obG
CountBean cb=new CountBean(); 4*E5@{D
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); fn5-Tnsq*
CountCache.add(cb); q TN)2G
out.print(CountCache.list.size()+"<br>"); [Y@>,B!V
CountControl c=new CountControl(); H|wP8uQC
c.run(); yf8kBT:&S
out.print(CountCache.list.size()+"<br>"); "8cI]~V
%>