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: 7ec0Xh1
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CountBean.java /MqXwUbO
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/* uR:=V9O
* CountData.java Yi&-m}
* m
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* Created on 2007年1月1日, 下午4:44 ^{*f3m/
* 2Za,4'
* To change this template, choose Tools | Options and locate the template under w;c#drY7S
* the Source Creation and Management node. Right-click the template and choose )nNCB=YF!
* Open. You can then make changes to the template in the Source Editor. 'ZC}9=_g
*/ B3dA%\'
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package com.tot.count; 0SMQDs5j
w3=)S\
/** nx-1*
* O~h94 B`
* @author (D>y6r>r
*/ XpgV09.EE
public class CountBean { k%]DT.cE
private String countType; dv'E:R(a
int countId; =@JS88+
/** Creates a new instance of CountData */ h41$|lonU%
public CountBean() {} Z>x7|Q3CX
public void setCountType(String countTypes){ m0|Ae@g~3
this.countType=countTypes; 7Ai o`&^
} @)vy'qP d
public void setCountId(int countIds){ t{Hh&HX
this.countId=countIds; 9^PRX
}
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public String getCountType(){ 4`8IFK
return countType; lI4J=8O0
} Q+b.-iWR
public int getCountId(){ >+:r '
return countId; mQJ4;BJw
} 2y+70(E1
} _{e&@d
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CountCache.java 4ZI!,lv*
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/* ,u}<Ws8N
* CountCache.java OL=ET)Y
* 8: HSPDU.
* Created on 2007年1月1日, 下午5:01 9Hh~ nR?
* X`yNR; >
* To change this template, choose Tools | Options and locate the template under .!JMPf"QEI
* the Source Creation and Management node. Right-click the template and choose 3(!/["@7
* Open. You can then make changes to the template in the Source Editor. IXZ(]&we
*/ Z|ZBKcmg
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package com.tot.count; .3{[_iTM
import java.util.*; / R_ u\?k(
/** ;TL(w7vK
* (Sth:{;
* @author uxa=KM1H
*/ J>=1dCK
public class CountCache { k42b:W5%
public static LinkedList list=new LinkedList(); 908ayfVI
/** Creates a new instance of CountCache */ e'1 ^+*bU
public CountCache() {} Y*@|My`
public static void add(CountBean cb){ 5v|H<wPp
if(cb!=null){ })20Zld}a
list.add(cb);
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} iV?` i
} J` w]}GlH
} T3PX gL)o
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CountControl.java WP0 #i~3*
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/* ku{XW8
* CountThread.java cz2,",+~
* 6Z~Ya\~.g.
* Created on 2007年1月1日, 下午4:57 .zvlRt.zl
* &/s~? Iq
* To change this template, choose Tools | Options and locate the template under LthGZ|>
* the Source Creation and Management node. Right-click the template and choose Dd| "iA
* Open. You can then make changes to the template in the Source Editor. +0]'| t F>
*/ g<fDY6jt
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package com.tot.count; aZ`<PdA
import tot.db.DBUtils; 8+"10q-
import java.sql.*; /61by$E
/** 4|nQ=bIau
* "hWJ3pi{o{
* @author yeh8z:5Z O
*/ RcgRaQ2^
public class CountControl{ !\CG,E k
private static long lastExecuteTime=0;//上次更新时间 n`% 2Mj c
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 su&t7rJ
/** Creates a new instance of CountThread */ ZB828T3
public CountControl() {} .i$,}wtw
public synchronized void executeUpdate(){ 5 U%MoH
Connection conn=null; "H>.':c"+3
PreparedStatement ps=null; uie~' K\y
try{ [UM Lx
conn = DBUtils.getConnection(); ?VB#GJ0M9
conn.setAutoCommit(false); bA}Z0a
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); rO0ZtC{K
for(int i=0;i<CountCache.list.size();i++){ %c]nWR+/
CountBean cb=(CountBean)CountCache.list.getFirst(); ;a|`s
CountCache.list.removeFirst(); t)9]<pN%
ps.setInt(1, cb.getCountId()); [s~JceUyX
ps.executeUpdate();⑴ *4t-e0]j@w
//ps.addBatch();⑵ wW-A b
} *=Doe2(!C
//int [] counts = ps.executeBatch();⑶ :$=|7v
conn.commit(); - %|P
}catch(Exception e){ }sv!=^}BY3
e.printStackTrace(); h40'@u^W
} finally{ a mqOxb
try{ CWs: l3_yn
if(ps!=null) { aqF+zPKs6
ps.clearParameters(); 5C/2b.-[
ps.close(); LfEvc2
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ps=null; R:"+ #Sq
} Z!=L
}catch(SQLException e){} ;)?( 2
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DBUtils.closeConnection(conn); EZ<80G
} 5G#$c'A{4
} 6mCq/$
public long getLast(){ YZ+>\ x
return lastExecuteTime; 6B#('gxO
} \eQla8s
public void run(){ vQ 4}WtvA
long now = System.currentTimeMillis(); |zq4* 5
if ((now - lastExecuteTime) > executeSep) { Bz+.Qa+
//System.out.print("lastExecuteTime:"+lastExecuteTime); 0#QKVZq2>
//System.out.print(" now:"+now+"\n"); p%F8'2)}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !tU'J"Zy
lastExecuteTime=now; R:~(Z?
executeUpdate(); Q"%S~'
} qe$33f*
else{ RvyuGU
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); O~ 27/
} QdDObqVdy
} MTb,Kmw<(
} 1AF%-<`?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 >SoO4i8
/v|Onq1Y4
类写好了,下面是在JSP中如下调用。 D+sQP ymI
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<% &~ *.CQa
CountBean cb=new CountBean(); k#C
f})
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); GAw(mH*
CountCache.add(cb); 2ev*CX6.
out.print(CountCache.list.size()+"<br>"); @4drjT
CountControl c=new CountControl(); Z\Z,,g+WL
c.run(); *YtB )6j
out.print(CountCache.list.size()+"<br>"); }_}KVI
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