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: FZjtQ{M
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CountBean.java N<$uAns
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/* .6e5w1r63
* CountData.java R0oP##]
* AL
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* Created on 2007年1月1日, 下午4:44 )oAK)e
* NFmB ^@k
* To change this template, choose Tools | Options and locate the template under m"H9C-Y
* the Source Creation and Management node. Right-click the template and choose rb`C:#j{J
* Open. You can then make changes to the template in the Source Editor. s )~Q@ze2
*/ r4!zA-{
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package com.tot.count; R%7k<1d'`
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/** ,^AkfOY7"
* \iu2rat^
* @author M#F;eK2pf
*/ 1xT^ ,e6
public class CountBean { <aL$d7
private String countType; @-!w,$F)%d
int countId; Ji%T|KR_
/** Creates a new instance of CountData */ JK[7&C-O
public CountBean() {} (iBBdB
public void setCountType(String countTypes){ .hETqE` E
this.countType=countTypes; ZVK;m1?'
} '=%vf
public void setCountId(int countIds){ j&Z:|WniK
this.countId=countIds; Q\ro )r
} )WKe,:C
public String getCountType(){ x<9|t(
return countType; A/BL{ U}
} lt}|Y9h
public int getCountId(){ P`V#Wj4\
return countId; 4i/ TEHQ
} d:<{!}BR3
} <
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CountCache.java lyv9eM
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/* JGH9b!}-1
* CountCache.java 4y%N(^
* <<4G GO
* Created on 2007年1月1日, 下午5:01 r&Za*TD^
* NoDq4>
* To change this template, choose Tools | Options and locate the template under -pa.-@
* the Source Creation and Management node. Right-click the template and choose @36^4E>h
* Open. You can then make changes to the template in the Source Editor. NWX~@Rg
*/ d3^LalAp
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package com.tot.count; !Y`nKC(=z
import java.util.*; {l_R0
/** tEBf2|<
* RQ}x7</{
* @author !Bu<6
*/ &$vDC M4
public class CountCache { %oC]Rpdu
public static LinkedList list=new LinkedList(); 4?72TBl]
/** Creates a new instance of CountCache */ AB}Qd\
public CountCache() {} OuS{ve
public static void add(CountBean cb){ 6q6&N'We
if(cb!=null){ D
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list.add(cb); X-~Q
} V,|9$A;
} ,|xG2G6
} jVk|(
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CountControl.java >:Q:+R;3o
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/* klJDYFX=HK
* CountThread.java |w /txn8G|
* E62VuX
* Created on 2007年1月1日, 下午4:57 ,iiWVA"
* gh i!4
* To change this template, choose Tools | Options and locate the template under C2ToT \^
* the Source Creation and Management node. Right-click the template and choose 98o;_tU'
* Open. You can then make changes to the template in the Source Editor. >G/>:wwSP.
*/ )k29mqa`
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package com.tot.count; wyAqrf
import tot.db.DBUtils; [J-r*t"!
import java.sql.*; |]r# IpVf
/** b^hCm`2w*
* :M|bw{P*
* @author j(Q$frI
*/ br$!}7#=L
public class CountControl{ a,&Kvh
private static long lastExecuteTime=0;//上次更新时间 E3NYUHfZ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 fa5($jJ&
/** Creates a new instance of CountThread */ Y k~ i.p
public CountControl() {} jCKRoao
public synchronized void executeUpdate(){ T7cT4PAW
Connection conn=null; t'm]E2/
PreparedStatement ps=null; e/@udau
try{ as
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conn = DBUtils.getConnection(); iVXR=A\er
conn.setAutoCommit(false); y^M'&@F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); n (cSfT
for(int i=0;i<CountCache.list.size();i++){ C. 8>
CountBean cb=(CountBean)CountCache.list.getFirst(); 8 _`Lx_R
CountCache.list.removeFirst(); GXJ3E"_.
ps.setInt(1, cb.getCountId()); G/<{:R"
ps.executeUpdate();⑴ 4_r8ynq{z
//ps.addBatch();⑵ {fIH9+v
} s#*
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//int [] counts = ps.executeBatch();⑶ aoF>{Z4&B
conn.commit(); 0b*a2_|8k
}catch(Exception e){ F)DL/';
e.printStackTrace(); 9Cf^Q3)5o
} finally{ B*DH^";t
try{ qc*+;Wi+5
if(ps!=null) {
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ps.clearParameters(); :VLuI
ps.close(); QfwGf,0p
ps=null; >(%im:_
} \ 0<e#0-V
}catch(SQLException e){} hc0VS3 k)
DBUtils.closeConnection(conn); Hyee#fB
} (W@
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} b[RBp0]x
public long getLast(){ f<kL}B+,Og
return lastExecuteTime; Z$WT ~V
} wQ[2yq
public void run(){ LGod"8~U
long now = System.currentTimeMillis(); A9lqVMp64
if ((now - lastExecuteTime) > executeSep) { g3x192f
//System.out.print("lastExecuteTime:"+lastExecuteTime); cMK6
//System.out.print(" now:"+now+"\n"); \DGm[/P
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); c1:op@t
lastExecuteTime=now; L~ 1Lv?
executeUpdate(); %
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} ^ /g&Q
else{ eh)J'G]G
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); &V$'{
} Yq5}r?N
} xR1g
} s|{K?s
//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 ih~c(&n0
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类写好了,下面是在JSP中如下调用。 lbv, jS
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<% 8q tNK>D
CountBean cb=new CountBean(); }^LcKV
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); OpH9sBnA
CountCache.add(cb); 53(m9YLk
out.print(CountCache.list.size()+"<br>"); u)Y#&q