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: sR1_L/.
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CountBean.java UgAp9$=z
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/* OU UV8K
* CountData.java :W, S
* ]Z5m_-I
* Created on 2007年1月1日, 下午4:44 y/\b0&
* }qM^J;uy
* To change this template, choose Tools | Options and locate the template under A9b(P[!]T:
* the Source Creation and Management node. Right-click the template and choose |&8XmexLb
* Open. You can then make changes to the template in the Source Editor. K1hkOj;S
*/ 4+q,[m-$(
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package com.tot.count; #4mRMsW5"
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/** n5kGHL2
* 73rme,
* @author r{v3XD/
*/ lo>9 \ Po
public class CountBean { 4&cQW)
private String countType; ? Vd~
int countId; ;Va(l$zD
/** Creates a new instance of CountData */ BS fmS(.
public CountBean() {} :
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public void setCountType(String countTypes){ ,Suk_aX>
this.countType=countTypes; Axsezr/
} 1<'z)r4
public void setCountId(int countIds){ D/Ki^E
this.countId=countIds; /al56n
} ]]K?Q
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public String getCountType(){ x9>$197
return countType; |K1S(m<F
} a6n@
public int getCountId(){ >
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return countId; nrKAK^
} 1"Oe*@`pV
} V8 8u-
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CountCache.java n#x_da-m]
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/* pYQSn.`V~
* CountCache.java x
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* @/kI;8
* Created on 2007年1月1日, 下午5:01 ]:Ep1DIMl
* >`UqS`YQK
* To change this template, choose Tools | Options and locate the template under dP_QkO
* the Source Creation and Management node. Right-click the template and choose Ag9GYm
* Open. You can then make changes to the template in the Source Editor. 1ARtFR2C{b
*/ 6d]4
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package com.tot.count; ;SU<T^a
import java.util.*; ?h4[yp=w
/** %cn1d>M+I
* 8_!qoW@B
* @author Y^Buz<OiG
*/ ?I^$35
public class CountCache { h@R n)D
public static LinkedList list=new LinkedList(); 0]7jb_n1
/** Creates a new instance of CountCache */ 6Sd:5eTEQ
public CountCache() {} M,JwoKyg
public static void add(CountBean cb){ :G 5p`;hGo
if(cb!=null){ K*j
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list.add(cb); ^5]9B<i[Y
} #6\mTL4vg
} c;]\$#2
} \;Q(o$5<
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CountControl.java P
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/* gS<p~LPf
* CountThread.java t RU/[?!
* !O"2)RU1
* Created on 2007年1月1日, 下午4:57 []@@
* \@Cz 32wg
* To change this template, choose Tools | Options and locate the template under 0J'^<GTL
* the Source Creation and Management node. Right-click the template and choose WDghlC6g!l
* Open. You can then make changes to the template in the Source Editor. L-E &m* %
*/ F}l3\uC]
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package com.tot.count; DL V ny]
import tot.db.DBUtils; ThX3@o
import java.sql.*; 9ad)=3A&L
/** Se!w(Y&
* J'WzEgCnU
* @author Jf2JGTcm
*/ D,.`mX
public class CountControl{ ub8d]GZJ
private static long lastExecuteTime=0;//上次更新时间 R-zS7Jyox
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 #9(+)~irz`
/** Creates a new instance of CountThread */ {D8opepO)
public CountControl() {} +ZjDTTk
public synchronized void executeUpdate(){ ]vf_4QW=
Connection conn=null; OSO MFt
PreparedStatement ps=null; bJMsB|r
try{ VE]TT><
conn = DBUtils.getConnection(); c=tbl|Cq
conn.setAutoCommit(false); eMdP4<u
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); vX>{1`e{S
for(int i=0;i<CountCache.list.size();i++){ <UO[*_,\
CountBean cb=(CountBean)CountCache.list.getFirst(); ^E/6vG
CountCache.list.removeFirst(); OH>Gc-V
ps.setInt(1, cb.getCountId()); &