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: C,ARXW1
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CountBean.java b2OQtSr a
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/* {pnS Q
* CountData.java lTV'J?8!-a
* e}
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* Created on 2007年1月1日, 下午4:44 NnDxq%l%
* iV *q2<>
* To change this template, choose Tools | Options and locate the template under 4'a=pnE$
* the Source Creation and Management node. Right-click the template and choose %'s>QF]'
* Open. You can then make changes to the template in the Source Editor. 5ft`zf
*/ CsoiyY -2
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package com.tot.count; B"TAjB&
*
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/** $m].8?
* ,y
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* @author {MCi<7j<?
*/ LWz&YF#T-
public class CountBean { -bT)]gA2
private String countType; h?BFvbAt
int countId; ^Eb.:}!D6
/** Creates a new instance of CountData */ !'&n-Q
public CountBean() {} d%RC
public void setCountType(String countTypes){ <SgM@0m
this.countType=countTypes; z$/_I0[
} mpuq 9)6
public void setCountId(int countIds){ pgI^4h
this.countId=countIds; /H(?
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} TarIPp
public String getCountType(){ r? NznNVU
return countType; {|&5_][
} K;>9ZZtl
public int getCountId(){ k.vBj~xU
return countId; h_:C+)13`x
} F+,~v-
} z(_Ss@ $
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CountCache.java fPn>v)lN{
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/* RrX[|GLSJ
* CountCache.java 1zm ulj%&
* ]>LhkA@V
* Created on 2007年1月1日, 下午5:01 wkA+j9.
* trPAYa}W
* To change this template, choose Tools | Options and locate the template under Q[vJqkgT
* the Source Creation and Management node. Right-click the template and choose )uj Ex7&c
* Open. You can then make changes to the template in the Source Editor. [F0s!,P
*/ h]+C.Eqnt#
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package com.tot.count; Ghx3EVqnx"
import java.util.*; Cjqklb/
/** y .#")IAF
* !MYSfPdS
* @author zVXC1u9B
*/
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public class CountCache { tZ=E')!\
public static LinkedList list=new LinkedList(); \m7-rV6r
/** Creates a new instance of CountCache */ D7lK30
public CountCache() {} @wpN6 /
public static void add(CountBean cb){ *BR~}1
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if(cb!=null){ o<<xY<
list.add(cb); A+::O@_s
} !>{G,\^=pT
} A'q#I>j`
} dx;Ysn0-
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CountControl.java YP.5fq:
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/* #w,Dwy
* CountThread.java o7J
* ^T ?RK"p
* Created on 2007年1月1日, 下午4:57 u.mJQDTH
* X%Z{K-
* To change this template, choose Tools | Options and locate the template under ]l1\? I
* the Source Creation and Management node. Right-click the template and choose ;i
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* Open. You can then make changes to the template in the Source Editor. jT8#C=a7
*/ OUeyklw
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package com.tot.count; q}~3C1
import tot.db.DBUtils; ln?v
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import java.sql.*; gZLP\_CL
/** ue4Vcf
* ]$Yvj!K*Q
* @author )Y2{_ bx4"
*/ :uWw8`
public class CountControl{ \^ZlG.
private static long lastExecuteTime=0;//上次更新时间 R%Q@
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 }._eIx"
/** Creates a new instance of CountThread */ i\KQ!f>A
public CountControl() {} t?}zdI(4
public synchronized void executeUpdate(){ V}dJ.I /#
Connection conn=null; in~D
PreparedStatement ps=null; 2.% .Z_k)
try{ pPc TrN'
conn = DBUtils.getConnection(); 1+9W+$=h2
conn.setAutoCommit(false); ]}U*_rM:
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 9?0^ap,T
for(int i=0;i<CountCache.list.size();i++){ 8-BflejX
CountBean cb=(CountBean)CountCache.list.getFirst(); 'yL%3h
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CountCache.list.removeFirst(); VY~yg*
ps.setInt(1, cb.getCountId()); xZ6~Ma2z
ps.executeUpdate();⑴ !q9+9 *6
//ps.addBatch();⑵ tS|(K=$
} # a<Gxj
//int [] counts = ps.executeBatch();⑶ nq6@6GRG
conn.commit(); 95YL]3V
}catch(Exception e){ W0l,cOOZJ
e.printStackTrace(); /4g1zrU
} finally{ ~C>?W[Y
try{ Cq'KoN%nQ
if(ps!=null) { ,QcF|~n
ps.clearParameters(); MhR:c7,
ps.close(); Fxm$9(Y
ps=null; (>r[-Bft
} pov)Z):}G<
}catch(SQLException e){} -F<Wd/Xse
DBUtils.closeConnection(conn); Z@3i$8
} CC L
} MOn
public long getLast(){ !"\80LP
return lastExecuteTime; tD+9kf2
} Cn "s`
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public void run(){ MBqt&_?K
long now = System.currentTimeMillis(); 3?1`D/
if ((now - lastExecuteTime) > executeSep) { y#q?A,C@n
//System.out.print("lastExecuteTime:"+lastExecuteTime); Pmh8sw
//System.out.print(" now:"+now+"\n"); jpO7'ivG
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); f'
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lastExecuteTime=now; @JyK|.b#0
executeUpdate(); a=hxJ1O
} QNpqdwu%h
else{ 4`!Z$kt
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {\c(ls{
} mg*qiScfW
} [%77bv85.G
} XpBj%e:
//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 (]Y 5eM
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类写好了,下面是在JSP中如下调用。 my4giC2a
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<% ]
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CountBean cb=new CountBean(); `Ye\p6v!+
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ~TSy<t~%-
CountCache.add(cb); @U3Vc|
out.print(CountCache.list.size()+"<br>"); E
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CountControl c=new CountControl(); (`sH3&Kl
c.run(); Z|5?7v;h5
out.print(CountCache.list.size()+"<br>"); C4~;y hz
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