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: 2H/{OQ$
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CountBean.java ,</Kn~b
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/* qIwsK\^p
* CountData.java l4ru0V8s7
* Sq]QRI/
* Created on 2007年1月1日, 下午4:44 r7FpR!
* `_SV1|=="8
* To change this template, choose Tools | Options and locate the template under Gn^m 541
* the Source Creation and Management node. Right-click the template and choose D2I|Z
* Open. You can then make changes to the template in the Source Editor. 0UhJ
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*/ %D3Asw/5a
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package com.tot.count; ZF@$3
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/** \. a 7F4h
* $f=6>Kn|^]
* @author ~l}\K10L*
*/ !8&EkXTw,
public class CountBean { [lGxys)J
private String countType; B+z>$6
int countId; m qwJya
/** Creates a new instance of CountData */ Aw&0R" {
public CountBean() {} LfN,aW
public void setCountType(String countTypes){ VniU:A
this.countType=countTypes; kK:U+`+
} e~geBlLar
public void setCountId(int countIds){ j/;wxKW
this.countId=countIds; ]f>0P3O5&
} pKU(4&BxX
public String getCountType(){ x@3cZd0j#
return countType; EiVVVmm!
} _&r19pY
public int getCountId(){ AdRp{^w
return countId; xnHB
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} 5\}E4y
} qRHT~ta-?
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CountCache.java QD-`jV3
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/* dDa&:L
* CountCache.java 0U8'dYf
* 2"c 5<
* Created on 2007年1月1日, 下午5:01 nl~Z,Y$
* R'8S)'l
* To change this template, choose Tools | Options and locate the template under 7CH.BY
* the Source Creation and Management node. Right-click the template and choose 3taGb>15
* Open. You can then make changes to the template in the Source Editor. ^6J*:(eM
*/ *4%%^*g.I
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package com.tot.count; Eihy|p
import java.util.*; _l2_) ~
/** p`EgMzVO,
* Bg}l$?S
* @author BkP4.XRI
*/ ;*0nPhBw0>
public class CountCache { 2.vmZaKP
public static LinkedList list=new LinkedList(); CY.4 >,
/** Creates a new instance of CountCache */ iNc!zA4
public CountCache() {} _mJhY0Oc
public static void add(CountBean cb){ iCCe8nK
if(cb!=null){ ]E)\>Jb
list.add(cb); 'bsHoO
} CDoD9Hq,
} `z$P,^g`
} UyFC\vQ
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CountControl.java u%lUi2P2E
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/* p:W{c/tV
* CountThread.java 5nTcd@lX
* !a25cm5ys
* Created on 2007年1月1日, 下午4:57 \XwC |[%P
* !2>@:CKX
* To change this template, choose Tools | Options and locate the template under B&_Z&H=
* the Source Creation and Management node. Right-click the template and choose I0qJr2[X~
* Open. You can then make changes to the template in the Source Editor. I1rB,%p
*/ ;&'r yYrex
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package com.tot.count; 4LW~
import tot.db.DBUtils; 9tb-;|
import java.sql.*; bZr,jLEf
/** ?1zGs2Qs
* ^;F5ymb3U
* @author +25=u|#4r
*/ G"tlJ7$myQ
public class CountControl{ V.6pfL
private static long lastExecuteTime=0;//上次更新时间 8I Ip,#%v
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 OCq5}%yU&i
/** Creates a new instance of CountThread */ Y]5spqG
public CountControl() {} 5W$Jxuyqj
public synchronized void executeUpdate(){ /Kq'3[d8
Connection conn=null; 'Ebjn>"
PreparedStatement ps=null; &=kb>*
try{ }"SqB{5e(
conn = DBUtils.getConnection(); wX_~H*m?
conn.setAutoCommit(false); >2=
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7WUvO
for(int i=0;i<CountCache.list.size();i++){ GgnR*DVP$
CountBean cb=(CountBean)CountCache.list.getFirst(); C| 2|OTtQ
CountCache.list.removeFirst(); &,=FPlTC=
ps.setInt(1, cb.getCountId()); e6bh,BwgQq
ps.executeUpdate();⑴ cx ("F/Jm
//ps.addBatch();⑵ Z`86YYGK
} 8Lgm50bs
//int [] counts = ps.executeBatch();⑶ y/kB`Z(Yj
conn.commit(); yimK"4!j5A
}catch(Exception e){ W/b)OlG"2
e.printStackTrace(); La3rX
} finally{ k{=dV
try{ +S[3HX7H
if(ps!=null) { Z[ &d2'
ps.clearParameters(); 0w0{@\9
ps.close(); $zU%?[J
ps=null; e$2P/6k>
} O1)\!=&
.
}catch(SQLException e){} T,jb%uPcE
DBUtils.closeConnection(conn); sHMO9{[7H
} VumM`SH
} k#u)+e.'
public long getLast(){ D6|-nl
return lastExecuteTime; 0xO*8aKT
} n\V7^N
public void run(){ /nu z_y\J
long now = System.currentTimeMillis(); <VQ)}HW;k
if ((now - lastExecuteTime) > executeSep) { 1r_V$o$
//System.out.print("lastExecuteTime:"+lastExecuteTime); ;ISe@yR;
//System.out.print(" now:"+now+"\n"); k<CbI
V
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); mF|KjX~s
lastExecuteTime=now; )7[#Ti
executeUpdate(); u"m(a:jQ
} ^Il*`&+?P
else{ `CC=?E
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); &6
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} h_+
} PB7-`uz
} j;7E+Yp
//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 D6l.x]K
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类写好了,下面是在JSP中如下调用。 Kop(+]Q&n
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<% deVnAu =
CountBean cb=new CountBean(); y+w,j]
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {j;` wN
CountCache.add(cb); |2@*?o"ll
out.print(CountCache.list.size()+"<br>"); J 7 G-qF\
CountControl c=new CountControl(); tq3Rc}
c.run(); %>_6&A{K,d
out.print(CountCache.list.size()+"<br>"); %=Z/Frd
%>