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: 1O23"o5=
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CountBean.java &b!vWX1N
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/* Mc!2mE%47m
* CountData.java ),MU+*`
* 9n-T5WP
* Created on 2007年1月1日, 下午4:44 e"lD`*U8R
* yr%yy+(.k
* To change this template, choose Tools | Options and locate the template under JR!Q,7S2!N
* the Source Creation and Management node. Right-click the template and choose -ywX5B
* Open. You can then make changes to the template in the Source Editor. "2%y~jrDN
*/ T^d#hl.U
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package com.tot.count; ,YQ=Zk)w
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/** 0c`sb+?
* :ao^/&HZ
* @author 219R&[cb
*/ (I>HWRH
public class CountBean { prqyoCfq
private String countType; Y'2-yB
int countId; F9F" F
/** Creates a new instance of CountData */ 3>H2xh 3Y
public CountBean() {} Tw}@+-
public void setCountType(String countTypes){ j/~VP2R`
this.countType=countTypes; vNPfUEnA
} 4+-5,t7
public void setCountId(int countIds){ vwm|I7/w
this.countId=countIds; y9=t;qH@|
} 8?A@/
public String getCountType(){ o@Scz!"g
return countType; )\RzE[Cb
} ix(U:'{
public int getCountId(){ cO8`J&EK
return countId; l&\tf`~
} !NILpimi
} .mC~Ry+t
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CountCache.java ful]OLV+
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/* ?OdV1xB
* CountCache.java ~K4k'
* RA#\x.
* Created on 2007年1月1日, 下午5:01 +[>yO _}
* 9cl{hdP{
* To change this template, choose Tools | Options and locate the template under X77A; US
* the Source Creation and Management node. Right-click the template and choose ww-XMz h
* Open. You can then make changes to the template in the Source Editor. rat=)n)"t
*/ 'Na|#tPYI
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package com.tot.count; Up_>y>x
import java.util.*; <+ -V5O^
/** 7^n,Tig
* &*X3ch
* @author (PRaiE
*/ s4!|v`+$M
public class CountCache { nrxjN(9V%+
public static LinkedList list=new LinkedList(); #&;m<%
/** Creates a new instance of CountCache */ E6,`Ld;c[
public CountCache() {} OJnPP>
public static void add(CountBean cb){ -OHvK0~
if(cb!=null){ pI'8>_o
list.add(cb); ;5&k/CB1
} '=KuJ0`nE9
} Wpiv1GZ%c8
} NvXj6U*%
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CountControl.java 6 lB{Ao?|
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/* nL 1IS
* CountThread.java gn-=##fT:i
* 34"{rMbQ
* Created on 2007年1月1日, 下午4:57 ?q+8 /2
* :7HVBH
* To change this template, choose Tools | Options and locate the template under ~Da
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* the Source Creation and Management node. Right-click the template and choose '?&B5C
* Open. You can then make changes to the template in the Source Editor. 'e+-,CGdY\
*/ {LR#(q$1
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package com.tot.count; >qSO,$
import tot.db.DBUtils; z'5;f;
import java.sql.*; ^4n2
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/** .F{}~K]
* 9OrA9r
* @author FE$M[^1_
*/ 9$B)hrJo
public class CountControl{ -~QlHp&SY
private static long lastExecuteTime=0;//上次更新时间 f 3nnXE"
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 A5 &>!y
/** Creates a new instance of CountThread */ <) >gg!
public CountControl() {} |[lxV&SD.
public synchronized void executeUpdate(){ KUl
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Connection conn=null; , V0iMq
PreparedStatement ps=null; K8yWg\K
try{ GV `idFd
conn = DBUtils.getConnection(); &-EyM*:u!
conn.setAutoCommit(false); B`'}&6jr.
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); T>AI0R3
for(int i=0;i<CountCache.list.size();i++){ m)tI
CountBean cb=(CountBean)CountCache.list.getFirst(); `R4W4h'I
CountCache.list.removeFirst(); z/c'Z#w%
ps.setInt(1, cb.getCountId()); Y{x[N}h
ps.executeUpdate();⑴ *~\;&G29Y
//ps.addBatch();⑵ @LwVmR |{
} %8bFQNd
//int [] counts = ps.executeBatch();⑶ ~FK+bF?%
conn.commit(); rRF+\cP?.
}catch(Exception e){ $g}/T_26
e.printStackTrace(); LbtlcpF*~5
} finally{ 1Ud
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try{ YyX^lL_
if(ps!=null) { f_z2#,g
ps.clearParameters(); >X@.f1/5X
ps.close(); zWKrt.Dg
ps=null; fzPgX
} LN,$P
}catch(SQLException e){} Zp% ""
DBUtils.closeConnection(conn); @E&X&F%
} ;&7qw69k
} .{-iq(3
public long getLast(){ +#i,87
return lastExecuteTime; il `C,CD
} +E""8kW- Z
public void run(){ Z(Ls#hp
long now = System.currentTimeMillis(); Px^<2Q%Fs
if ((now - lastExecuteTime) > executeSep) { Yc|-sEK/
//System.out.print("lastExecuteTime:"+lastExecuteTime); A61-AwvF8-
//System.out.print(" now:"+now+"\n"); (>)+;$Dr,\
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {<Xo,U7y
lastExecuteTime=now; {kY`X[fvZ
executeUpdate(); z~A(IQO
} 1*eWvYo1
else{ JY;#]'T\;
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); X~<>K/}u5
} 6w .iEb
} 0X}w[^f
} !Cv<>_N).
//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 [8om9 Z3
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类写好了,下面是在JSP中如下调用。 .[eSKtbc)
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<% SbQ{ >
CountBean cb=new CountBean(); ni 02N3R
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); u+, jAkr
CountCache.add(cb); f R{WS:Pv
out.print(CountCache.list.size()+"<br>"); ":ws~Zep
CountControl c=new CountControl(); =^".{h'-
c.run(); ^HU=E@
out.print(CountCache.list.size()+"<br>"); m-pIFL<^N
%>