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: rZEu@63
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CountBean.java gS%J`X$
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/* ;3!TOY"j;e
* CountData.java {f)p|)
* f} apn=
* Created on 2007年1月1日, 下午4:44 h4/rw
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* 1gC=xMAT
* To change this template, choose Tools | Options and locate the template under b+3pu\w`
* the Source Creation and Management node. Right-click the template and choose .jCdJ
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* Open. You can then make changes to the template in the Source Editor. G4i&:0
*/ 4{Iz\:G:{/
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package com.tot.count; :X^B1z3X4
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/** L4!$bB~L-
* _heQ|'(
* @author nT>?}/S
*/ Oj:`r*z43
public class CountBean { Lv_>cFJ}[
private String countType; }IV7dKzl
int countId; w*+rB p,f
/** Creates a new instance of CountData */ >QyMeH
public CountBean() {} d+(~{xK:
public void setCountType(String countTypes){ B 5?(gb"
this.countType=countTypes; 4&\m!s
} @*oi1_q
public void setCountId(int countIds){ gC 4w&yL
this.countId=countIds; 4l|Am3vzX
} _]\mh,}
public String getCountType(){ ,=mn*
return countType; [\!S-:
} {E9Y)Z9
public int getCountId(){ |89`O^
return countId; Zy'bX* s|
} ~&pk</Dl
} GcKJpI\sB
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CountCache.java .Ee8s]h5W
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/* b;yhgdFx
* CountCache.java |peZ`O^~
* 3Ry?{m^
* Created on 2007年1月1日, 下午5:01 yCz?V[49
* ,Zdc
* To change this template, choose Tools | Options and locate the template under t~Uqsa>n@'
* the Source Creation and Management node. Right-click the template and choose Ei#"r\q j_
* Open. You can then make changes to the template in the Source Editor. 8Hhe&B
*/ e0 D;]
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package com.tot.count; K1Tzy=Z9j
import java.util.*; x*YJ:t
/** AIE)q]'Q
* QoqdPk#1
* @author a`T{5*@
*/ 0q/g:"|j
public class CountCache { }p#S;JZRu+
public static LinkedList list=new LinkedList(); (\Dd9a8V-
/** Creates a new instance of CountCache */ .G^.kg ,
public CountCache() {} $,
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public static void add(CountBean cb){ '?-GZ0oM
if(cb!=null){ Jzr(A^vwo
list.add(cb); 6gp3n;D
} !_]WUQvV?
} E_xpq
} mFvw s
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CountControl.java @A)gsDt9A
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/* 6Up,B=sX0
* CountThread.java w_9:gprf
* }g3)z%Xe'[
* Created on 2007年1月1日, 下午4:57 ;1BbRnCr
* 4b 4nFRnH
* To change this template, choose Tools | Options and locate the template under D3I;5m`_
* the Source Creation and Management node. Right-click the template and choose nGRF<2!
* Open. You can then make changes to the template in the Source Editor. 7OT}V}iP
*/ d/;oNC+
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package com.tot.count; 39u!j|VH
import tot.db.DBUtils; u tQ_!3u
import java.sql.*; s,0,w--=
/** QtRKmry{
* TIS}'c'C
* @author ?4xTA
*/ =6? 3c\
public class CountControl{ -tDmzuD6
private static long lastExecuteTime=0;//上次更新时间 ~_R=2t{u_
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 u%&zY97/
/** Creates a new instance of CountThread */ w;X-i.%`
public CountControl() {} WhvO-WF
public synchronized void executeUpdate(){ byd[pnI$H
Connection conn=null; GXsHc,
PreparedStatement ps=null; Ij#?r2Z%
try{ lT*Hj.
conn = DBUtils.getConnection(); '*22j ]
conn.setAutoCommit(false); rQ/S|gG
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); S9mj/GpL3
for(int i=0;i<CountCache.list.size();i++){ }4+S_b
CountBean cb=(CountBean)CountCache.list.getFirst(); 1MOQ/N2BR
CountCache.list.removeFirst(); C,K P!B{
ps.setInt(1, cb.getCountId()); Zr`:A$
ps.executeUpdate();⑴ N2C^'dFj
//ps.addBatch();⑵ W[+E5I
} oZ!rK/qoA
//int [] counts = ps.executeBatch();⑶ 4j/8Otn
conn.commit(); \p.ku%{
}catch(Exception e){ $NqT={!
e.printStackTrace(); MvObx'+
} finally{ V"
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try{ QarA.Ne~
if(ps!=null) { Al
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ps.clearParameters(); 3pm;?6i6
ps.close(); #VD[\#
ps=null; _t3n<
} 7Sr7a{
}catch(SQLException e){} Io|
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DBUtils.closeConnection(conn); "M2HiV
} 8j8FQ!M
} 3TO$J
public long getLast(){ !x|Ok'izDL
return lastExecuteTime; I lvjS^j
} <