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: ,jTPg/r
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CountBean.java s6/cL|Ex
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/* F3 Y<ZbxT
* CountData.java @.1Qs`pt
* m#;.yR
* Created on 2007年1月1日, 下午4:44 )tvc/)&A}
* b*`fLrqV.
* To change this template, choose Tools | Options and locate the template under 8yvJ`eL-
* the Source Creation and Management node. Right-click the template and choose ?uig04@3
* Open. You can then make changes to the template in the Source Editor. H>Ks6V)RL4
*/ =EWD
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package com.tot.count; K#@K"N=
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/** RPY6Wh|4
* tI'e ctn
* @author H(?e&Qkg
*/ aoK4Du{
public class CountBean { Xj(>.E{~H
private String countType; ],Ab cTX
int countId; [?|5oaK
/** Creates a new instance of CountData */ g4Bg6<;
public CountBean() {} gkLr]zv
public void setCountType(String countTypes){ tpE3|5dZF
this.countType=countTypes; =@%MV(
} `!_? uT
public void setCountId(int countIds){ %![4d;Z%x
this.countId=countIds; /CbkqNV
} 5uzpTNAMM1
public String getCountType(){ pIL`WE1'
return countType; oR7 7`
} H&9wSG`
public int getCountId(){ aK-N}T
return countId; (KZUvsS k
} )|Jr|8
} >[hrJn[
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CountCache.java %bN"bxv^
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/* :3:)E
* CountCache.java \#HL`R"
* Xp.|.)Od
* Created on 2007年1月1日, 下午5:01 oA[2)BU
* h@EJTAi
* To change this template, choose Tools | Options and locate the template under :LG}yq^
* the Source Creation and Management node. Right-click the template and choose g}^4^88=a
* Open. You can then make changes to the template in the Source Editor. !P+~c0DF
*/ /]P%b K6B
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package com.tot.count; 'w: tq
import java.util.*; nsy!p5o
/** aIY$5^x
* dV'6m@C
* @author zjzqKdy}F
*/ 1i ?gvzrq
public class CountCache { }6F_2S3c
public static LinkedList list=new LinkedList(); G;87in ,}
/** Creates a new instance of CountCache */ jp"XS
public CountCache() {} &?&'"c{;m
public static void add(CountBean cb){ QJb7U5:B+
if(cb!=null){ mOABZ#+Fk
list.add(cb); /2=_B4E2
} jqV)V> M.
} "0p +SZ~D
} KBp!zSl
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CountControl.java y=y/d>=w
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/* PTfN+
* CountThread.java 30wYc &H
* /r #b
* Created on 2007年1月1日, 下午4:57 OLhWkN,qA
* 5M/%%Ox
* To change this template, choose Tools | Options and locate the template under zzDNWPzsA
* the Source Creation and Management node. Right-click the template and choose :..E:HdYO
* Open. You can then make changes to the template in the Source Editor. TW;|G'}$
*/ AIIBd
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package com.tot.count; )eIz{Mdp=
import tot.db.DBUtils; R]V~IDs
import java.sql.*; ^H@!)+
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/** ;@h'Mb
* P"[ifsp
* @author 7N-CtQnv
*/ t6! p\Y}}
public class CountControl{ js%4;
private static long lastExecuteTime=0;//上次更新时间 i75?*ld
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 83p$!8]u
/** Creates a new instance of CountThread */ Rz])wBv e
public CountControl() {} S]#=ES'^/
public synchronized void executeUpdate(){ =B,_d0Id
Connection conn=null; wd2P/y42;;
PreparedStatement ps=null; 4q@9
try{ kOlI?wc
conn = DBUtils.getConnection(); N'Z_6A*-
conn.setAutoCommit(false); w2M
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); |{}d5Z"5;}
for(int i=0;i<CountCache.list.size();i++){ OmoplJ+
CountBean cb=(CountBean)CountCache.list.getFirst(); { 8|Z}?I
CountCache.list.removeFirst(); s`$_
ps.setInt(1, cb.getCountId()); s\3Z?zm8
ps.executeUpdate();⑴ 7!` C TE
//ps.addBatch();⑵ Cx1Sh#9
} XyKKD&j
//int [] counts = ps.executeBatch();⑶ qNuv?.7
conn.commit(); }X W#?l
}catch(Exception e){ 3ec==.
e.printStackTrace(); ^0BF2&Zx
} finally{ iA{chQBr
try{ <|>:UGAR
if(ps!=null) { r)Mx.`d!
ps.clearParameters(); 8t^;O!
ps.close(); B2Awdw3=g
ps=null; gC,0+Y~
} xVwi
}jtG|
}catch(SQLException e){} &&QDEDszp
DBUtils.closeConnection(conn); 5jCEy*%P@
} bju,p"J1-E
} 80l3.z,:
public long getLast(){ ;wYwiSVd
return lastExecuteTime; #D*J5k>2
} xr7<(:d
public void run(){ fU){]YP
long now = System.currentTimeMillis(); 9Av- ;!]
if ((now - lastExecuteTime) > executeSep) { %onAlf<$:^
//System.out.print("lastExecuteTime:"+lastExecuteTime); `X]2iz
//System.out.print(" now:"+now+"\n"); iTBhLg,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Ul~}@^m]4}
lastExecuteTime=now; !?>p]0*<
executeUpdate(); {TN@KB
} =jd=Qs IL
else{ V~^6 TS(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); bU +eJU_%
} HI`A;G]
} #L*@~M^]
} PFn[[~5V
//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 AZ Lt'9UD
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类写好了,下面是在JSP中如下调用。 <?va)
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<% h,jAtL!
CountBean cb=new CountBean(); $4~}_phi
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); kviSQM2
CountCache.add(cb); y.]]V"'2
out.print(CountCache.list.size()+"<br>"); v}*u[GWl]
CountControl c=new CountControl(); g1!L.
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c.run(); kp>Z /kt
out.print(CountCache.list.size()+"<br>"); kx#L<
%>