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: IL>VH`D
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CountBean.java Q{[l1:
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/* 0SjB&J
* CountData.java 9%Eo<+myh
* m?O~(6k@C
* Created on 2007年1月1日, 下午4:44 a^o'KN{
* -I?8\
* To change this template, choose Tools | Options and locate the template under I+{2DY/}
* the Source Creation and Management node. Right-click the template and choose WQ+ xS!ba
* Open. You can then make changes to the template in the Source Editor.
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*/ Fy 1- >~
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package com.tot.count; Z% DJ{!Hnh
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/** <k?pnBI_
* vnN0o5
* @author }el7@Gv
*/ baoyU#X9
public class CountBean { ~^TH5n
private String countType; p'`?CJq8
int countId; riZ :#I
/** Creates a new instance of CountData */ b4qMTRnv
public CountBean() {} W3zYE3DZf
public void setCountType(String countTypes){ P$x9Z3d_
this.countType=countTypes; Vk> &
} ,!40\"A
public void setCountId(int countIds){ n:[@#xs-
this.countId=countIds; k|,Y_h0Y
} ff;~k?L
public String getCountType(){ %M3L<2
return countType; <Umr2Vw-
} k Nvb>v
public int getCountId(){ [D+,I1u2h
return countId; to'CuPkT
} d#OAM;0}5
} k;B[wEW@
"} "/d(
CountCache.java A`#?Bj
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/* H:|.e)$i
* CountCache.java .{t*v6(TP
* Xj{gyLs
* Created on 2007年1月1日, 下午5:01 A=0{}B#
* P!"{-m'
* To change this template, choose Tools | Options and locate the template under Z($i+L% .
* the Source Creation and Management node. Right-click the template and choose !Rc
%
* Open. You can then make changes to the template in the Source Editor. jEE!H/
*/ *MS$C$HOq
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package com.tot.count; @ x .`z
import java.util.*; ;Xf1BG r
/** c`/VYgcTqB
* soLW'8
* @author \WBO(,]V
*/ Y=4
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public class CountCache { Do7 7V5
public static LinkedList list=new LinkedList(); :tbgX;tCs5
/** Creates a new instance of CountCache */ Wsgp#W+
public CountCache() {} qw$9i.Z
public static void add(CountBean cb){ <S=(`D
if(cb!=null){ MhR`
list.add(cb); RcO"k3J
} $E&T6=Wn
} F3qCtx*N
} /* qx5$~
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CountControl.java z{|0W!nHJ
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/* qTK(sW
* CountThread.java %W8iC%~
* o">~ObR
* Created on 2007年1月1日, 下午4:57 M(nzJ
* I`(53LCqo
* To change this template, choose Tools | Options and locate the template under `Th~r&GvF
* the Source Creation and Management node. Right-click the template and choose (6B;
* Open. You can then make changes to the template in the Source Editor. %.hJDX\j
*/ Xy%||\P{)
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package com.tot.count; IA<>+NS
import tot.db.DBUtils; 7)]boW~Q
import java.sql.*; :'B(DzUR
/** 1I`F?MT
* cE:s\hG
* @author p5$}h,7
*/ {f\wIZ-K A
public class CountControl{ %VFoK-a
private static long lastExecuteTime=0;//上次更新时间 \c<;!vkZ04
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 =3c?W&:
/** Creates a new instance of CountThread */ 1Xo0(*O
public CountControl() {} (D%vN&F
public synchronized void executeUpdate(){ kmc_%Wm}
Connection conn=null; u3#+fn_
PreparedStatement ps=null; <!g]q1
try{ _qR?5;v
conn = DBUtils.getConnection(); YTFU#F
conn.setAutoCommit(false); 26g]_Igq
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (_|*&au J
for(int i=0;i<CountCache.list.size();i++){ haBmwq(f
CountBean cb=(CountBean)CountCache.list.getFirst(); ,|d9lK`" P
CountCache.list.removeFirst(); _Iminet
ps.setInt(1, cb.getCountId()); |YsR;=6wT
ps.executeUpdate();⑴ :P}3cl_
//ps.addBatch();⑵ :Rb\Ca
} j&,Gv@
//int [] counts = ps.executeBatch();⑶ {N>ju
conn.commit(); `@
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}catch(Exception e){ sBB[u'h!
e.printStackTrace(); #lrwKHZ+
} finally{ X+ITW#
try{ 2zqaR[C
if(ps!=null) { l>K+4
ps.clearParameters(); cN0
*<
ps.close(); 1R3,Z8j'
ps=null; 6`O,mpPu4G
} 8 7(t<3V&
}catch(SQLException e){} Sc]K-]1(H
DBUtils.closeConnection(conn); m{Vd3{H40
} nf^?X`g
} 5PO_qr=Hx
public long getLast(){ o3dqsQE%
return lastExecuteTime; &Gh0f"?
} F<