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: |l!aB(NW
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CountBean.java D/' dTrR
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/* 4Po_-4
* CountData.java C9;kpqNG#u
* c*M}N?|6
* Created on 2007年1月1日, 下午4:44 ," ql5Q4
* "Rl}VeDY
* To change this template, choose Tools | Options and locate the template under LH6vLuf
* the Source Creation and Management node. Right-click the template and choose S]{oPc[7
* Open. You can then make changes to the template in the Source Editor. K>
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*/ ;n},"&
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package com.tot.count; 3gf1ownC
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/** M3Kfd
* b`_Q8 J
* @author j+YJbL v
*/ ,z?':TZ
public class CountBean { A2Tw<&Tw(
private String countType; ,u!sjx
int countId; aQ~s`^D
/** Creates a new instance of CountData */ -K$)DvV^(E
public CountBean() {} wA.\i
public void setCountType(String countTypes){ :@&/kyGH
this.countType=countTypes; y?#
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} dqAw5[qMJ
public void setCountId(int countIds){ h`wD
this.countId=countIds; BerwI
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} K|@G t%Y
public String getCountType(){ 2Rz
return countType; QS j]ZA
} xezcAwW
public int getCountId(){ %>s|j'{
return countId; p4)Q&k!
} wNX]7wMX
} ?%kV?eu'
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CountCache.java S[QrS7
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/* J8~haim
* CountCache.java 9>$p
* -Qe Z#w|
* Created on 2007年1月1日, 下午5:01 A\;U3Zu
* .sA.C]f
* To change this template, choose Tools | Options and locate the template under 'ig'cRD6N
* the Source Creation and Management node. Right-click the template and choose hzC>~Ub5
* Open. You can then make changes to the template in the Source Editor. r_.S>]
*/ *$*ce|V5
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package com.tot.count; a: K[ y
import java.util.*; @|)Z"m7
/** 8r!zBKq2~
* nF/OPd
* @author ~_ a-E
*/ 'H!XUtFs"
public class CountCache { FgI3
public static LinkedList list=new LinkedList(); ?hM64jI|
/** Creates a new instance of CountCache */ y3ikWnx
public CountCache() {} s(8W_4&'
public static void add(CountBean cb){ Qei"'~1a
if(cb!=null){ { "E\Jcjl\
list.add(cb); RGX=)
} "*H`HRi4T
} UZ$/Ni
} E!AE4B1bd
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CountControl.java Cls%M5MH
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/* xwty<?dRW1
* CountThread.java |)G<,FJQE_
* Xry47a
)
* Created on 2007年1月1日, 下午4:57 RFH0
* l@:0e]8|o
* To change this template, choose Tools | Options and locate the template under $mB;K]m
* the Source Creation and Management node. Right-click the template and choose .{KVMc
* Open. You can then make changes to the template in the Source Editor. Lh<).<S
*/ 6 aV_@no.C
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package com.tot.count; 3k?X-|O8AZ
import tot.db.DBUtils; {}x^ri~
import java.sql.*; -!9G0h&i|
/** Mc}^LDX
* Y4(
* @author llsfTrp
*/ w`=\5Oa .G
public class CountControl{ 'Z |mQZN
private static long lastExecuteTime=0;//上次更新时间 I2^8pTLh
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 <^uBoKB/f
/** Creates a new instance of CountThread */ 3D(0=$W
public CountControl() {} <Ok3FE.K
public synchronized void executeUpdate(){ o8vug$=Z
Connection conn=null; nNU2([
PreparedStatement ps=null; 4H<lm*!^
try{ gzg_>2Sj
conn = DBUtils.getConnection(); uM'Jp?
conn.setAutoCommit(false); rXU\
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ?R#)1{(8d~
for(int i=0;i<CountCache.list.size();i++){ Xs?o{]Fe
CountBean cb=(CountBean)CountCache.list.getFirst(); "wHFN>5B
CountCache.list.removeFirst(); ~3 bPIg7D
ps.setInt(1, cb.getCountId()); E+JqWR5
ps.executeUpdate();⑴ d^6M9lGU
//ps.addBatch();⑵ MqUH',\3
} ]g&TKm
//int [] counts = ps.executeBatch();⑶ y^%y<~f
conn.commit(); AzxXB
}catch(Exception e){ ofv)SCjd
e.printStackTrace(); tnG# IU
*
} finally{ pHJ3nHLQ
try{ E@3aI
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if(ps!=null) { Tu 7QCr5*
ps.clearParameters(); r>U@3%0&
ps.close(); JO<wU
ps=null; "w.3Q96r
} WeiFmar
}catch(SQLException e){} 3%ZOKb"D*
DBUtils.closeConnection(conn); m%e68c
} mdgi5v
} VU d\QR-
public long getLast(){ D5HZ2cz|a
return lastExecuteTime; "FKOaQ%IH
} ^v`\x5"Vp
public void run(){ W{gb:^;zb
long now = System.currentTimeMillis(); 6i~WcAs
if ((now - lastExecuteTime) > executeSep) { [zM-^
//System.out.print("lastExecuteTime:"+lastExecuteTime); Ez=Olbk
//System.out.print(" now:"+now+"\n"); #
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ZJ[
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lastExecuteTime=now; d<N:[Y\4l
executeUpdate(); aAA U{EWW
} C 6AUNRpl
else{ Z/;aT -N
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Nu7
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} iW /}#
} 9p2&)kb6
} &IB