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: :gD0EqV
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CountBean.java j t`p<gI
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/* vYSetAdv
* CountData.java (C l`+ V
* (>LHj]}K
* Created on 2007年1月1日, 下午4:44 [B~zoB(
* A-7wkZ.H
* To change this template, choose Tools | Options and locate the template under ,-7/]h,l
* the Source Creation and Management node. Right-click the template and choose a4jnu:e
* Open. You can then make changes to the template in the Source Editor. L_~I~
*/ Vr-3M+l=O
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package com.tot.count; 3KG) 6)1*
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/** *)NR$9lGv
* XW~ BEa
* @author zK>'tFU
*/ XJJ[F|k~
public class CountBean { {FJX
private String countType; }r~v,KDb
int countId; /G)KkBC
/** Creates a new instance of CountData */
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public CountBean() {} X&9^&U=e
public void setCountType(String countTypes){ FU5LYXCs
this.countType=countTypes; ?K4.L?D#J
} vzyN c'
public void setCountId(int countIds){ miG;]-"^
this.countId=countIds; V<HOSB7
} v#:+n+y\z
public String getCountType(){ ~"JE![XR
return countType; qP;{3FSkAF
} ^fE\ S5P
public int getCountId(){ &N/|(<CB
return countId; . QQ?w
} =M1a 0i|d
} u+mjguIv
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CountCache.java ^J#?hHz
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/* N?a1sdR
* CountCache.java ;z.6'EYMG
* Jb3>vCIn
* Created on 2007年1月1日, 下午5:01 $ ]W[y=
* `qf\3JT\
* To change this template, choose Tools | Options and locate the template under lruF96C/Y
* the Source Creation and Management node. Right-click the template and choose tDC0-N&6S~
* Open. You can then make changes to the template in the Source Editor. BaWQ<T8p8
*/ @tr&R==([
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package com.tot.count;
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import java.util.*; 3 {NaZIk
/** 'A@qg^e:`
* t4f
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* @author }b_R5U$@@
*/ saGRP}7?
public class CountCache { aW0u8Dz
public static LinkedList list=new LinkedList(); ,]~u:Y}
/** Creates a new instance of CountCache */ o,S!RG&
public CountCache() {} +={
public static void add(CountBean cb){ XGE
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if(cb!=null){ C6K|:IK{
list.add(cb); g(-;_j!=
} o,?!"*EP
} K-2.E
} 4*0:bhhhf_
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CountControl.java $Cz1C
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/* rnnX|}J
* CountThread.java 2wB.S_4"-<
* opm?':Qst
* Created on 2007年1月1日, 下午4:57 zW%>"y
* ?!bd!:(N
* To change this template, choose Tools | Options and locate the template under +dqk6RE
* the Source Creation and Management node. Right-click the template and choose Dh
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* Open. You can then make changes to the template in the Source Editor. SQh+5
*/ N7e`6d!
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package com.tot.count; &?SX4c~?u
import tot.db.DBUtils; KKLR'w,A>
import java.sql.*; /Jh1rck
/** 7]p>XAb
* -h>Z,-DE6
* @author tlDYk
*/ y\^@p=e
public class CountControl{ 7)B&(2D&
private static long lastExecuteTime=0;//上次更新时间 |w=Ec#)t4
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9 wAA.
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/** Creates a new instance of CountThread */ mbF(tSy
public CountControl() {} *,"jF!C&[
public synchronized void executeUpdate(){ |:./hdcad
Connection conn=null; 4F}Pu<;
PreparedStatement ps=null; ETM2p1ru0
try{ 6XdWm
conn = DBUtils.getConnection(); '#O;mBPNi
conn.setAutoCommit(false); Dq?E\
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); GHv{
for(int i=0;i<CountCache.list.size();i++){ n%F-cw
CountBean cb=(CountBean)CountCache.list.getFirst(); ID)^vwn
CountCache.list.removeFirst(); `-4'/~G
ps.setInt(1, cb.getCountId()); (jMtN?&0H-
ps.executeUpdate();⑴ DH:J
//ps.addBatch();⑵ dw~[9oh
} ypH8QfxLTr
//int [] counts = ps.executeBatch();⑶ BY3bpR
conn.commit(); ovo/!YJ2
}catch(Exception e){ '0]r<O
e.printStackTrace(); <O.Kqk*
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} finally{ '0Lov]L
try{ 2R~6<W+&:>
if(ps!=null) { %Ys$@dB
ps.clearParameters(); H#+\nT2m
ps.close(); yk<VlS
ps=null; t\zbEN
} uG;?vvg>
}catch(SQLException e){} .hKhrcQp
DBUtils.closeConnection(conn); 7!pLK&_
} jO=*:{#x
} _m Xs4
public long getLast(){ Zb."*zL
return lastExecuteTime; YJd8l>mz
} S.: 7k9
public void run(){
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long now = System.currentTimeMillis(); \]I
if ((now - lastExecuteTime) > executeSep) { s
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//System.out.print("lastExecuteTime:"+lastExecuteTime); R"Kz!NTB
//System.out.print(" now:"+now+"\n"); 3E,DipHg
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); J@QdieW6
lastExecuteTime=now; fYB*6Xb,w
executeUpdate(); Cc!J1)
} 8.yCA
else{ Tr%FUi
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )\>r-g$
} JdiP>KXV
} *hF^fxLbl
} =p q:m
//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 b,Ke>.m
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类写好了,下面是在JSP中如下调用。 oSY7IIf%L
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<% n3$gx,KL
CountBean cb=new CountBean(); \,R!S /R#
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); [/cIUQ
CountCache.add(cb); T`\]!>eb
out.print(CountCache.list.size()+"<br>"); o\4CoeG
CountControl c=new CountControl(); zT7"VbP
c.run(); UW6VHA>
out.print(CountCache.list.size()+"<br>"); $3k
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%>