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: |`;1p@w"
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CountBean.java *0@;
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/* |e;z"-3
* CountData.java >iWf7-:
* Cv(N5mA2
* Created on 2007年1月1日, 下午4:44 Ho8.-QSG
* d!z).G
* To change this template, choose Tools | Options and locate the template under H6\ x.J^,
* the Source Creation and Management node. Right-click the template and choose ihY^~
* Open. You can then make changes to the template in the Source Editor. ecI
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*/ Qnb?hvb"d
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package com.tot.count; hsVJ&-#
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/** I)%jPH:ua
* OO+#KyU
* @author v4a4*rBI"
*/ #~-&&S4a.J
public class CountBean { CJtjn
private String countType; `1}?{ud
int countId; `iayh
/** Creates a new instance of CountData */ wOkJ:k
public CountBean() {} l=?y=2+
public void setCountType(String countTypes){ =2)$|KC
this.countType=countTypes; /(pD^D
} IoHkcP[H
public void setCountId(int countIds){ }%d-U;Tt2
this.countId=countIds; tBI+uu aa2
} s=Q*|
public String getCountType(){ '\E{qlI
return countType; HYnq x>L ~
} {1U*:@j
public int getCountId(){ *k]S{]Y
return countId; a`X&;jH0ef
} =X5&au o
} &vvx"
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CountCache.java \bQ!>l\
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/* $yqq.#1
* CountCache.java 2m_M9e\
* x[~OVG0M*
* Created on 2007年1月1日, 下午5:01 ]`H.qV
* u0KZrz
* To change this template, choose Tools | Options and locate the template under =(5GU<}
* 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. +9F#~{v`4a
*/ KXfW&d(Pk
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package com.tot.count; Vg~
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import java.util.*; }w^ T9OC
/** Z=[a 8CU
* )j|y.[
* @author J9c3d~YW
*/ LtWU"42
public class CountCache { <$2zr4
public static LinkedList list=new LinkedList(); ^o\p|f>f
/** Creates a new instance of CountCache */ dq/?&X
public CountCache() {} 5@A=,
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public static void add(CountBean cb){ Q~!hr0
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if(cb!=null){ CF92AY
list.add(cb); ^&/&I9z
} .eXA.9|jm
} 'J0s%m|j
} hg=G//
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CountControl.java =usDI<3r
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/* #$B,8LFz,$
* CountThread.java yzR=:0J
* U`_vF~el~
* Created on 2007年1月1日, 下午4:57 )&!@O$RS8(
* E!l1a5qB
* To change this template, choose Tools | Options and locate the template under 5GL+j%7
* the Source Creation and Management node. Right-click the template and choose G-?9;w'@
* Open. You can then make changes to the template in the Source Editor. !:[n3.vm
*/ NRF%Qd8I/2
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package com.tot.count; ?s} E<Kr
import tot.db.DBUtils; <@!kR$Rd
import java.sql.*; `0sk2fn
/** nJH%pBc
* #R4KBXN
* @author % peb{i
*/ m1i$>9,
public class CountControl{ c} ET#2,
private static long lastExecuteTime=0;//上次更新时间 cNc_
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 )K3
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/** Creates a new instance of CountThread */ tg3JU\
public CountControl() {} IqKXFORiNI
public synchronized void executeUpdate(){ pv SFp-:_
Connection conn=null; o`! :Q!+
PreparedStatement ps=null; Fe<
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try{ JlGD.!`
conn = DBUtils.getConnection(); 7]zZha4X
conn.setAutoCommit(false); 5mVu]T`
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (gB=!1/|G
for(int i=0;i<CountCache.list.size();i++){ bxe 97]
CountBean cb=(CountBean)CountCache.list.getFirst(); K -1~K
CountCache.list.removeFirst(); \ySc uT
ps.setInt(1, cb.getCountId());
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ps.executeUpdate();⑴ >*xzSd?\
//ps.addBatch();⑵ (k.7q~:
} e-=PT1T`
//int [] counts = ps.executeBatch();⑶ 4!%LD(jB`B
conn.commit(); G{=$/&St
}catch(Exception e){ ()
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e.printStackTrace(); q#-H+7 5
} finally{ )p9n|C
try{ Gn4b\y%%
if(ps!=null) { $_5v^QL
ps.clearParameters(); 4aKy]zPoE
ps.close(); ZM`_P!G
ps=null; X&X')hzIt
} )pa|uH+N
}catch(SQLException e){} 1*b%C"C
DBUtils.closeConnection(conn); gRI|rDC)B
} nDw9
} VSFl9/5?
public long getLast(){ %y+j~]^:
return lastExecuteTime; --)[>6)I
} 8}T3Fig,q
public void run(){ bkI A:2HX
long now = System.currentTimeMillis(); /2cOZ1G;
if ((now - lastExecuteTime) > executeSep) { ) <~7<.0
//System.out.print("lastExecuteTime:"+lastExecuteTime); ?7a[|-
//System.out.print(" now:"+now+"\n"); ovFfTP<3V
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); s>I}-=.(Q
lastExecuteTime=now; =ab}.dWC
executeUpdate(); JdEb_c3S
} _'a4I;
else{ TY?io@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Ve)
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} h(sKGCG
} i.4[]f[/h
} R~-q!nC
//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 =@l5He.]&
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类写好了,下面是在JSP中如下调用。 -v@^6bQVp
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<% %*=FLtBjo
CountBean cb=new CountBean(); <qx-%6
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); C ( ;7*]
CountCache.add(cb);
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out.print(CountCache.list.size()+"<br>"); YO+d+5
CountControl c=new CountControl(); q[K)bg{HB
c.run(); m:CpDxzbf
out.print(CountCache.list.size()+"<br>"); qChPT :a
%>