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: Qvny$sr2
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CountBean.java BvlY\^
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/* ICo Z<;p
* CountData.java -GgV&%'a
* Rpcnpo
* Created on 2007年1月1日, 下午4:44 ?fs#K;w
* \l6mXIn=>
* To change this template, choose Tools | Options and locate the template under :\#]uDT2=
* the Source Creation and Management node. Right-click the template and choose (I`<;
* Open. You can then make changes to the template in the Source Editor. \@2sI
*/ Fo"'[`
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package com.tot.count; /?j^Qu
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/** 8/34{2048
* B7ys`eiB5C
* @author gvZLW!={
*/ ,/L_9wV-\
public class CountBean { .>zkS*oX4z
private String countType; 4ri)%dl1
int countId; 9]8M {L
/** Creates a new instance of CountData */ WY~}sE
public CountBean() {} yC=vTzzp
public void setCountType(String countTypes){ 7L:R&W6
this.countType=countTypes; = &aD!nTx
} 8<^6<c
public void setCountId(int countIds){ 5Q72.4HH
this.countId=countIds; =TI|uD6T
} eWx6$_|
public String getCountType(){ VA'<
return countType; 13{"sY:PT#
} o9HDxS$~^
public int getCountId(){ Ll&5#q
return countId; DPtyCgH
} b_Ky@kp
} eEe8T=mD
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CountCache.java ?t.?f`(|
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/* L{CHAVkV
* CountCache.java l 0b=;^6
* >|I3h5\M
* Created on 2007年1月1日, 下午5:01 N<Q}4%^c
* 4_I,wG@
* To change this template, choose Tools | Options and locate the template under VF==F_l
* the Source Creation and Management node. Right-click the template and choose LRd,7P
* Open. You can then make changes to the template in the Source Editor. XWy
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*/ s_h<
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package com.tot.count; ;1OTK6
import java.util.*; O,1u\Zy/
/** VZlvmN
* "AVj]jR
* @author yxQAO_C
*/ \&qVr1|
public class CountCache { ?R{?Qv
public static LinkedList list=new LinkedList(); 0_y%Qj^e
/** Creates a new instance of CountCache */ a
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public CountCache() {} ;09J;sf
public static void add(CountBean cb){ |]\bgh
if(cb!=null){ +[}]a3)
list.add(cb); /~tfP
} zB]T5]
} ;<X3AhF
} x?<5=,
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CountControl.java 80]TKf>
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/* QBn>@jq
* CountThread.java o%9>elOju
* H62*8y8
* Created on 2007年1月1日, 下午4:57
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* A>g$[
* To change this template, choose Tools | Options and locate the template under eB@i)w?@o
* the Source Creation and Management node. Right-click the template and choose =K>Z{%i
* Open. You can then make changes to the template in the Source Editor. I2DmM"-|
*/ aQmL=9
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package com.tot.count; *nW9)T
import tot.db.DBUtils; 8k`zMT
import java.sql.*; d,+n,;6Cf
/** jb![ Lp
* dS&8R1\>1
* @author jRkq^}
*/ K]Cvk%
public class CountControl{ v(7A=/W_
private static long lastExecuteTime=0;//上次更新时间 E 6@;e-]j
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 {n{}Y.
/** Creates a new instance of CountThread */ .XB] X
public CountControl() {} rlIEch^wZ
public synchronized void executeUpdate(){ t3>rf3v
Connection conn=null; 7h0'R k
PreparedStatement ps=null; BD0-v`
try{ fDqXM;a"
conn = DBUtils.getConnection(); =GVhAzD3
conn.setAutoCommit(false); $B?7u@>,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); D5m\u$~V
for(int i=0;i<CountCache.list.size();i++){ VfcQibm
CountBean cb=(CountBean)CountCache.list.getFirst(); lmcDA,7
CountCache.list.removeFirst(); `k|nf9_
ps.setInt(1, cb.getCountId()); `s_TY%&_}g
ps.executeUpdate();⑴ QMxz@HGa|
//ps.addBatch();⑵ a*[\edcHU
} |)-:w?
//int [] counts = ps.executeBatch();⑶ Yc V~S#b
conn.commit(); 7 f*_
}catch(Exception e){ .am*d|&+G
e.printStackTrace(); ,6S8s
} finally{ Fb'wC
try{ u"gp">
if(ps!=null) { dR+$7N$
ps.clearParameters(); kZ9pgdI
ps.close(); "\[>@_p h
ps=null; pzr-}>xrZ
} `x VA]GR4c
}catch(SQLException e){} Wd5t,8*8
DBUtils.closeConnection(conn); y#DQOY+@^#
} dZgfls
} NLGr=*dq
public long getLast(){ ^e,RM_.
return lastExecuteTime; i?/?{p$#a-
} $bosGG
public void run(){ 9p4U\hx
long now = System.currentTimeMillis(); ex+AT;o
if ((now - lastExecuteTime) > executeSep) { vrv*k
//System.out.print("lastExecuteTime:"+lastExecuteTime); swFOh5z
//System.out.print(" now:"+now+"\n"); ~`E4E
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); B^?XE(.
lastExecuteTime=now; i=oa"^c4
executeUpdate(); WCu%@hh=h
} ,GnU]f
else{ z0[ZO1Fo(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); >2
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} RWo B7{G
} B-|Zo_7
} UYOn
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 vB*oI~<
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类写好了,下面是在JSP中如下调用。 hob$eWgr
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<% ?|GxVOl
CountBean cb=new CountBean(); Dg+d=I?
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); V^+:U>$w
CountCache.add(cb); 'e64%t
out.print(CountCache.list.size()+"<br>"); ~(/HgFLLu
CountControl c=new CountControl(); Ds_
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c.run(); Z|%2495\
out.print(CountCache.list.size()+"<br>"); ?\M6P?tpo&
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