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: 4 @ )|N'
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CountBean.java > -OQk"o
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/* WbB0{s
* CountData.java +Ccj@#M;
* 6"b =aPTi
* Created on 2007年1月1日, 下午4:44 @Pb!:HeJE
* A46Xei:Ow
* To change this template, choose Tools | Options and locate the template under f
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* the Source Creation and Management node. Right-click the template and choose _ 7X0
* Open. You can then make changes to the template in the Source Editor. k%Jv%m}aB
*/ Mt"j< ]EW
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package com.tot.count; F6`$5%$M;?
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/** '#L.w6<B
* \L Gj]mb1
* @author V*U{q%p(
*/ Ey4%N`H-^
public class CountBean {
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private String countType; x 8|sdZFxo
int countId; `KgIr,Q)
/** Creates a new instance of CountData */ HG{r\jh
public CountBean() {} W{B)c?G]
public void setCountType(String countTypes){ ~ (I'm[
this.countType=countTypes; 2|8e7q: +*
} nO.RB#I$F
public void setCountId(int countIds){ d2Pqi* K
this.countId=countIds; (
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} ~H`~&?
public String getCountType(){ 3Uw}!>`%
return countType; {a;my"ly
} JI##l:,7r
public int getCountId(){ R-5EztmLae
return countId; 9Kf# jZ
} {]ie|>'=C
} J=Q?_$xb}
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CountCache.java v0v%+F#>@
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/* %iMRJ}8(7
* CountCache.java tj7{[3~-[
* JO{Rth
* Created on 2007年1月1日, 下午5:01 IY jt*p5
* rXgU*3RG
* To change this template, choose Tools | Options and locate the template under w eu3c`-a
* the Source Creation and Management node. Right-click the template and choose >LS*G
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* Open. You can then make changes to the template in the Source Editor. W(.q.Sx>
*/ F-0 |&0
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package com.tot.count; ;]XK e')
import java.util.*; %+0
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/** Ky(=O1Ufu
* 4K{<R!2I
* @author 1HPYW7jk@"
*/ <e)5$Aj
public class CountCache { <?h`
public static LinkedList list=new LinkedList(); yCC.j%@
/** Creates a new instance of CountCache */ kIR?r0_<G6
public CountCache() {} *% 6NuZ
public static void add(CountBean cb){ y{{7)G
if(cb!=null){ Tp-<!^o4
list.add(cb); KPW2e2{4@
} j6@5"wx
} 0H;,~
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} fiG/"/u
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CountControl.java _\mMgZu
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/* [(Jj@HlP6T
* CountThread.java GB MCw
* SI-G7e)3;>
* Created on 2007年1月1日, 下午4:57 {6E&\
* r92C^h0
* To change this template, choose Tools | Options and locate the template under @-9u;aL
* the Source Creation and Management node. Right-click the template and choose HH`G/(a
* Open. You can then make changes to the template in the Source Editor. 6h8fzqRzc
*/ +T\c<lJ9
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package com.tot.count; t>]wWYy
import tot.db.DBUtils; T8*<
import java.sql.*; 6@N?`6Bt
/** z^xrB$8
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* mI;#Zq_j
* @author YSQB*FBz
*/ _hK83s4
public class CountControl{ (+_i^SqK
private static long lastExecuteTime=0;//上次更新时间 1lAx"VL
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 7-*QF>w<a
/** Creates a new instance of CountThread */ d`M]>EDXp
public CountControl() {} *cNqgw#\qL
public synchronized void executeUpdate(){ e~Hx+Qp.G
Connection conn=null; 7F=Xn@ _
PreparedStatement ps=null; 3)5Gzn
try{ 67916
conn = DBUtils.getConnection(); 4d\"gk
conn.setAutoCommit(false); OB-2xmZW
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); y]z^e\qc)
for(int i=0;i<CountCache.list.size();i++){ Uwd^%x*
CountBean cb=(CountBean)CountCache.list.getFirst(); 2d%j6D
CountCache.list.removeFirst(); auzrM4<tz
ps.setInt(1, cb.getCountId()); z?a<&`W
ps.executeUpdate();⑴ UD0via
//ps.addBatch();⑵ iGCA>5UE
} W`$D*X0*o
//int [] counts = ps.executeBatch();⑶ }YPW@g
conn.commit(); ;THb6Jz/+
}catch(Exception e){ B5-G.Z
e.printStackTrace(); %&D,|Yl6
} finally{ Mo4#UV
try{ st8=1}:&\
if(ps!=null) { ZjlFr(
ps.clearParameters(); NS^(5g
ps.close(); .*9+%FN
ps=null; IV"OzQONx
} '/Y
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}catch(SQLException e){} 2<