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: MOW {g\{\
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CountBean.java [u2)kH$
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/* Nm/Fc
* CountData.java ?YbZVoD)J
* *npe]cC
* Created on 2007年1月1日, 下午4:44 A?829<
* -d6*M*{|
* To change this template, choose Tools | Options and locate the template under &g<`i{_
* the Source Creation and Management node. Right-click the template and choose Jv=G3=.
* Open. You can then make changes to the template in the Source Editor. XS/5y(W
*/ wY j~ (P"
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package com.tot.count; :WBl0`kW]4
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/** /1q] D8
* mDp|EXN
* @author Z;JZ<vEt92
*/ q<cpU'-#
public class CountBean { )ozN{&B6
private String countType; =F}e>D
int countId; *oX~z>aE
/** Creates a new instance of CountData */ )WFSUZ~
public CountBean() {} sIJ37;ZA
public void setCountType(String countTypes){ ;"/ "
this.countType=countTypes; dO[w3\~
} lC i_G3C
public void setCountId(int countIds){ Sm%MoFf
this.countId=countIds; 2tqO%8`_
} 4x:Odt5
public String getCountType(){ BO p&s>hI
return countType; LvNk:99:<
}
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public int getCountId(){ q}["Nww-
return countId; jTx,5s-
} ZWJFd(6
}
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CountCache.java f V.(v&
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/* O({-lI
* CountCache.java hD/bO
* gU}?Yy
* Created on 2007年1月1日, 下午5:01 7M1*SC
* T<0Bq"'%
* To change this template, choose Tools | Options and locate the template under :q4Mnr
* the Source Creation and Management node. Right-click the template and choose `'[ 7M
* Open. You can then make changes to the template in the Source Editor. 3:Sv8csT
*/ J)n g,i
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package com.tot.count; !2N#H~{
import java.util.*; +:d))r=n
/** Om0S^4y]x
* {hM*h(W~3
* @author 7c6-S@L
*/ }r/L 9
public class CountCache { T8FKa4ikn
public static LinkedList list=new LinkedList(); 'vTD7a^
/** Creates a new instance of CountCache */ gGU3e(!Uc
public CountCache() {} 6P;1I+5m{q
public static void add(CountBean cb){ D] 2+<;>`>
if(cb!=null){ !+H=e>Y6
list.add(cb); 3P p*ID
} E4[\lX$J
} 9=I(AYG{m
} 6#5@d^a
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CountControl.java @11voD
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/* r/L3j0
* CountThread.java DRVvW6s
* v4|kiy
* Created on 2007年1月1日, 下午4:57 N1(}3O
* );;UNO21+
* To change this template, choose Tools | Options and locate the template under Z-H Kdv!d
* the Source Creation and Management node. Right-click the template and choose u6jJf@!ws
* Open. You can then make changes to the template in the Source Editor. (s{%XB:K
*/ s:cS 9A8
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package com.tot.count; Zk}e?Grc
import tot.db.DBUtils; rsP-?oD8)
import java.sql.*; 2#1FI0,Pa*
/** $X~=M_W
* tQJ@//C\z
* @author +.\JYH=yEr
*/ '7'cKp
public class CountControl{ OG 5n9sx
private static long lastExecuteTime=0;//上次更新时间 &TWO/F+Y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 !,\9,lc
/** Creates a new instance of CountThread */ QbqLj>-AJ
public CountControl() {} 8yFD2(#
public synchronized void executeUpdate(){ Zml9ndzT
Connection conn=null; Ed*`d>
PreparedStatement ps=null; kC9A
try{
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conn = DBUtils.getConnection(); =4 JVUu~Z
conn.setAutoCommit(false); N??<3j+Iu
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2 >xV&