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: YO`]UQ|dc
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CountBean.java cbjs9bu
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/* a"1t-x
* CountData.java #&+{mCjs
* T}Tp$.gB
* Created on 2007年1月1日, 下午4:44 3=#<X-);
* E#RDqL*J
* To change this template, choose Tools | Options and locate the template under e}voV0y\v:
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. q~Hn-5H4Q
*/ gE'sOT9v
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package com.tot.count; ,O5NLg-
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/** I@\lN&HC
* BkAm/R
* @author pp?D7S
*/ m[osg< CR_
public class CountBean { TvoyZW\?w
private String countType; >-?f0K
int countId; E,Z$pKL?
/** Creates a new instance of CountData */ 5PCqYN(:B
public CountBean() {} _~m5^Q&
public void setCountType(String countTypes){ L<c4kw
this.countType=countTypes; t|?ez4/{z
} j a[Et/r
public void setCountId(int countIds){ @/~omg}R
this.countId=countIds; [&[k^C5
} 1dY}\Sp
public String getCountType(){ PN%zIkbo
return countType; ^S<Y>Nm]
} ';Ea?ID
public int getCountId(){ UBKu/@[f@
return countId; n6=By|jRh
} Wb,KjtX
} $QF{iV@6d4
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CountCache.java Rr$-tYy6
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/* FgnTGY}
* CountCache.java 2ACCh4(/P
* R+:yVi[F]U
* Created on 2007年1月1日, 下午5:01 of~4Q{f$6
* &3>)qul
* To change this template, choose Tools | Options and locate the template under m,28u3@r
* the Source Creation and Management node. Right-click the template and choose ;]puq
* Open. You can then make changes to the template in the Source Editor. _RYxD"my
*/ 'c&Ed
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package com.tot.count; hW')Sp
import java.util.*; "9uKtQS0o
/** 3yme1Mb
* yF:1( 4
* @author 0JS?; fk
*/ bRDYGuC
public class CountCache { Rh2+=N<X
public static LinkedList list=new LinkedList(); OKZV{Gja
/** Creates a new instance of CountCache */ 234p9A@
public CountCache() {} GMx&y2. Z
public static void add(CountBean cb){ ;>hO+Wo
if(cb!=null){ `RT>}_j
list.add(cb); iXkF1r]i
} qbr$>xH
} ]#<4vl\
} ]EbM9Fo-U
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CountControl.java NX.6px17
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/* ;O5zUl-`
* CountThread.java Ty\R=y}}
* B
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* Created on 2007年1月1日, 下午4:57 + 480 l}
* , pfG
* To change this template, choose Tools | Options and locate the template under P:S .~Jq
* the Source Creation and Management node. Right-click the template and choose g/_5unI}u
* Open. You can then make changes to the template in the Source Editor. !TH)
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*/ Kn{4;Xk\
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package com.tot.count; hag$GX'2k
import tot.db.DBUtils; c]-<vkpV
import java.sql.*; Ny7 S
/** o[4}h:> dq
* "cGk)s
* @author (/YHk`v2
*/ <nf@U>wlw
public class CountControl{ ]m q|w
private static long lastExecuteTime=0;//上次更新时间 F<1fX 7c
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -IudgO]
/** Creates a new instance of CountThread */ qo~O|~
public CountControl() {} EWt[z.`T1
public synchronized void executeUpdate(){ //MUeTxR
Connection conn=null; dFc':|
PreparedStatement ps=null; h4}84}5d
try{ X`/k)N>l
conn = DBUtils.getConnection(); ]c*4J\s
conn.setAutoCommit(false); qZh/IW
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =*.~BG
for(int i=0;i<CountCache.list.size();i++){ C=xa5Y
CountBean cb=(CountBean)CountCache.list.getFirst(); P; no?
CountCache.list.removeFirst(); 2;b\9R^>A
ps.setInt(1, cb.getCountId()); 1~FOgk1;
ps.executeUpdate();⑴ rHI{aO7
//ps.addBatch();⑵ dQX6(Jj
} QL/(72K
//int [] counts = ps.executeBatch();⑶ jd"@t*ZV
conn.commit(); 4@gG<QJW
}catch(Exception e){ U>SShpmZA
e.printStackTrace(); T Z@]:e:"b
} finally{ Pm?KI<TH~
try{ (E3b\lST
if(ps!=null) { `[yKFa
I
ps.clearParameters(); #z%fx
ps.close(); est9M*Fn
ps=null; RBd7YWo\|j
}
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}catch(SQLException e){} I][*j
DBUtils.closeConnection(conn); Lb-OsKU
} Ee#q9Cx^J
} ?UR0:f:}oc
public long getLast(){ }v{LRRi
return lastExecuteTime; $wa{~'
} 7EEl+;wK
public void run(){ LOYk9m
long now = System.currentTimeMillis(); G!##X: 6'
if ((now - lastExecuteTime) > executeSep) { 6|=f$a
//System.out.print("lastExecuteTime:"+lastExecuteTime); MjRHA^b
//System.out.print(" now:"+now+"\n"); $HzBD.CF|x
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); =XQ%t
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lastExecuteTime=now; RP|`HkP-2
executeUpdate(); ?$pCsBDo
} yPp9\[+^j
else{ cVpp-Z|s8
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); IP pN@
} y.k~Y0
} !BF;
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} ^7*11%Q
//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 372rbY
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类写好了,下面是在JSP中如下调用。 ,p a {qne
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<% t?gic9
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CountBean cb=new CountBean(); T!{w~'=F
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); .{^5X)
CountCache.add(cb); kZ:ZtE
out.print(CountCache.list.size()+"<br>"); f~[7t:WD*
CountControl c=new CountControl(); t@;p
c.run(); wlvgg
out.print(CountCache.list.size()+"<br>"); Z{d^-
%>