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: Mttt]]
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CountBean.java qTc-Z5
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/* @bs
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* CountData.java s
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* 7{jB!Xj
* Created on 2007年1月1日, 下午4:44 2to~=/.
* Jr|"QRC
* To change this template, choose Tools | Options and locate the template under ~,#zdm1r@
* the Source Creation and Management node. Right-click the template and choose l0Rjq*5hJ
* Open. You can then make changes to the template in the Source Editor. \"=4)Huv
*/ dCq-&3?t
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package com.tot.count; bY`
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/** z[Sq7bbYO
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* @author l Tpn/
*/ 9*fA:*T
public class CountBean { x=-dv8N?
private String countType; W5 l)mAv
int countId; { #?$p i[
/** Creates a new instance of CountData */ >O0z+tj
public CountBean() {} <'(O0
public void setCountType(String countTypes){ ~x67v+I
this.countType=countTypes; $z1W0
} GSlvT:k
public void setCountId(int countIds){ [=3f:>ssm
this.countId=countIds; >~%!#,C(|U
} *[XVkt`H
public String getCountType(){ _#f+@)vR
return countType; `)i'1E[9
} 8ckcTNPu
public int getCountId(){ _6U=7<f
return countId; vP k\b 3E
} Pv-El+e!
} [\i0@
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CountCache.java 6f=,$:S$
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/* .kbo]P
* CountCache.java Z\1*g k
* ,[gu7z^|
* Created on 2007年1月1日, 下午5:01 %IAZU c
* k[_)5@2
* To change this template, choose Tools | Options and locate the template under vI84=n
* the Source Creation and Management node. Right-click the template and choose W~" 'a9H/
* Open. You can then make changes to the template in the Source Editor. 7E0L-E=.
*/ ajr);xd
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package com.tot.count; K;ncviGu
import java.util.*; [u?*'
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/** LUPh!)8
*
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* @author Z~X \Z.
*/ vw.rkAGY
public class CountCache { f&=WgITa
public static LinkedList list=new LinkedList(); ZnrsJ1f:
/** Creates a new instance of CountCache */ -_%8Q#"
public CountCache() {}
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public static void add(CountBean cb){ `Zdeq.R]
if(cb!=null){ 2YW|/o4
list.add(cb); s)dL^lj;
} So6ZNh9
} b\Wlpb=QZ
} v d{`*|x
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CountControl.java k4HE'WY
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/* ,Wbr;
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* CountThread.java 'R-Ly^:Qd
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* Created on 2007年1月1日, 下午4:57 N}|<P[LW
* iY~.U`b`
* To change this template, choose Tools | Options and locate the template under NA :_yA"
* the Source Creation and Management node. Right-click the template and choose /m"#uC!\
* Open. You can then make changes to the template in the Source Editor. ~]w|ULNa3|
*/ _ ^2\/@
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package com.tot.count; bU3P;a(
import tot.db.DBUtils; {4C/ZA{|l
import java.sql.*; J2_~iC&;s
/** B,xohT
* ]J '#KT{
* @author %pJRu-D
*/ W5)R{w0`GD
public class CountControl{ r
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private static long lastExecuteTime=0;//上次更新时间 B@+&?%ub:
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 /r8'stRzv
/** Creates a new instance of CountThread */ `d,v
public CountControl() {} -22]|$f
public synchronized void executeUpdate(){ eb#yCDIC
Connection conn=null; ^Rpy5/d
PreparedStatement ps=null; 4uX|2nJ2!;
try{ w=;Jj7}L
conn = DBUtils.getConnection(); %&Fsk]T%:
conn.setAutoCommit(false); }EMds3<
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); R(^2+mV?
for(int i=0;i<CountCache.list.size();i++){ 7A,lQh
CountBean cb=(CountBean)CountCache.list.getFirst(); `SfBT1#5G
CountCache.list.removeFirst(); ;h"St0
ps.setInt(1, cb.getCountId()); Hxr)`i46
ps.executeUpdate();⑴ Z[Z3x6
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//ps.addBatch();⑵ q,Nhfo(
} 0[
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//int [] counts = ps.executeBatch();⑶
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conn.commit(); Au\j6mB
}catch(Exception e){ =xs"<Q*w>
e.printStackTrace(); RE<s$B$[
} finally{ ,N1I\f
try{ _\ &