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: 5 :AAqMa
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CountBean.java U"ga0X5
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/* ebQYk$@
* CountData.java kiXa2Yn*(d
* [OMKk#vW
* Created on 2007年1月1日, 下午4:44 Q}1PPi,
* uT=sDWD:
* To change this template, choose Tools | Options and locate the template under *ZY{^f
* the Source Creation and Management node. Right-click the template and choose v_Jp9
* Open. You can then make changes to the template in the Source Editor. 578Dl(I#)
*/ 6v.*%E*P
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package com.tot.count; MEo+S
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/** n2TvPt\
* ^&.F!
* @author (3_2h4O
*/ 2o{Fp7l
public class CountBean { }-Zfljj
private String countType; ?SS?I
int countId; AR)&W/S)7,
/** Creates a new instance of CountData */ *X,vu2(I-=
public CountBean() {} vL-%"*>v
public void setCountType(String countTypes){ (z"Cwa@e
this.countType=countTypes; 8)sqj=
} JSO>rpO
public void setCountId(int countIds){ ~r=u1]z
this.countId=countIds; ,Kdvt@vle
} c?[A
public String getCountType(){ F!.@1Fi1
return countType; 5vY1 XZt{
} %M ~X:A;4
public int getCountId(){ xOZ?zN
return countId; RJ@d_~%U
} 6)Oe]{-
} Vrz<DB^-e
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CountCache.java =#uXO<
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/* ^2Op?J
* CountCache.java LkJ3 :3O
* ^W'\8L
* Created on 2007年1月1日, 下午5:01 UD"e:O_
* m3.d!~U\
* To change this template, choose Tools | Options and locate the template under I'J=I{p*
* the Source Creation and Management node. Right-click the template and choose TN` pai0
* Open. You can then make changes to the template in the Source Editor. p2tBF98
*/ %#"uK:(N
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package com.tot.count; |L0 s
import java.util.*; q"fK"H-j
/** Z\TH=UA
* %!x\|@C
* @author X%39cXM C
*/ 3+Xz5>"a
public class CountCache { u:fiil$
public static LinkedList list=new LinkedList(); 6ffrV
/** Creates a new instance of CountCache */ +-HaYB|p
public CountCache() {} }LQ&AIRN
public static void add(CountBean cb){ <gJ|Wee
if(cb!=null){ llQDZ}T
list.add(cb); d0IHl!X
} ;J2=6np
} qH"e:
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} nqy\xK#.^
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CountControl.java AVHn7olG
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/* v;{s@CM m
* CountThread.java ~M,nCG^4
* 4z?6[Cg<
* Created on 2007年1月1日, 下午4:57 OfY>~d
* A+:K!|w
* To change this template, choose Tools | Options and locate the template under ;nSaZ$`5
* the Source Creation and Management node. Right-click the template and choose &!Y^DR/
* Open. You can then make changes to the template in the Source Editor. Nqewtn9n
*/ SIzW3y[
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package com.tot.count; }fL8<HM\'c
import tot.db.DBUtils; F5{~2~Cw(
import java.sql.*; a+,)rY9
/** A+NLo[swwu
* sR'rY[^/|
* @author 2"JIlS;J}7
*/ M
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public class CountControl{ T?NwSxGo
private static long lastExecuteTime=0;//上次更新时间 E #8 `X
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 's!EAqCN
/** Creates a new instance of CountThread */ pOGVD
public CountControl() {} NCl$vc;,
public synchronized void executeUpdate(){ !f]F'h8
Connection conn=null; y}nM'$p
PreparedStatement ps=null; Kl\A&O*{
try{ My
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conn = DBUtils.getConnection(); ~@MIG
conn.setAutoCommit(false); 9:4P7
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); `N
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for(int i=0;i<CountCache.list.size();i++){ NTls64AS.
CountBean cb=(CountBean)CountCache.list.getFirst(); .K;*uq:0
CountCache.list.removeFirst(); rJKX4,M
ps.setInt(1, cb.getCountId()); x>p=1(L
ps.executeUpdate();⑴ .KTDQA\
//ps.addBatch();⑵ nEyPNm)
} J4xt!RW!
//int [] counts = ps.executeBatch();⑶ enK4`+.7
conn.commit(); axonqSf
}catch(Exception e){ *cq#>rN
e.printStackTrace(); sm4@ywd>
} finally{ W)$;T%u
try{ I)O%D3wfMW
if(ps!=null) { .V
9E@_(
ps.clearParameters(); x(}@se
ps.close(); U7bG(?k)
ps=null; R~[
u|EC}
} bP(V#6IJ8
}catch(SQLException e){} oI/@w
DBUtils.closeConnection(conn); ;@
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} hFs0qPVY
} %[&cy'
public long getLast(){ ^~eT#Y8
return lastExecuteTime; J+w"{ O
} -P@o>#Em
public void run(){ ZLxe$.V_
long now = System.currentTimeMillis(); ir3iW*5k
if ((now - lastExecuteTime) > executeSep) { C[_{ $j(J
//System.out.print("lastExecuteTime:"+lastExecuteTime); %U-KQI0
//System.out.print(" now:"+now+"\n"); C} Ewi-
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); f+1)Ju~
lastExecuteTime=now; 6EP5n
executeUpdate(); daY^{u3
} %ktU 51o
else{ nu4GK}xI
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); I^0bEwqZ~
} rQ@,Y"
} fb&K.6"
} 64hr|v
//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 gXc&uR0S
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类写好了,下面是在JSP中如下调用。 \[+ZKj:
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<% ,Es5PmV@$%
CountBean cb=new CountBean(); 2gg5:9
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); >=r094<
CountCache.add(cb); 71w
out.print(CountCache.list.size()+"<br>"); kc1 *@<L6
CountControl c=new CountControl(); qf(!3
c.run();
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out.print(CountCache.list.size()+"<br>"); adHHnH`,
%>