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: fDf[:A,8
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CountBean.java ur\6~'l4
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/* hc[ K
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* CountData.java 5tQz!M
* ;_e9v,
* Created on 2007年1月1日, 下午4:44 Td|u@l4B
* GQn:lu3j:
* To change this template, choose Tools | Options and locate the template under %7)TiT4V
* the Source Creation and Management node. Right-click the template and choose 3X`9&0:j%
* Open. You can then make changes to the template in the Source Editor. v}6iI}r
*/ >ep<W<b
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package com.tot.count; \X:e9~
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/** () _RLA
* B/1j4/MS
* @author uLS]=:BT
*/ *y?HaU
public class CountBean { wW@e#:
private String countType; )N&SrzqTK
int countId; LJGpa )(
/** Creates a new instance of CountData */ FN-/~Su~J
public CountBean() {} $u!(F]^
public void setCountType(String countTypes){ 1+;bd'Ie
this.countType=countTypes; U`ttT5;
} !H\oQv-I
public void setCountId(int countIds){ P_1WJ
this.countId=countIds; hpF_@n
} FfJp::|ddr
public String getCountType(){ j8`
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return countType; "/aZ*mkjfJ
} PN
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public int getCountId(){ j2MA['{
return countId; O8@65URKx
} cERIj0~
} -[7+g
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CountCache.java h9H z6
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/* DWt|lO
* CountCache.java S{+t>en
* x|0C0a\"A
* Created on 2007年1月1日, 下午5:01 l/'GbuECm
* f=F:Af!
* To change this template, choose Tools | Options and locate the template under \%a0Lp{ I
* the Source Creation and Management node. Right-click the template and choose 89FAh6u E
* Open. You can then make changes to the template in the Source Editor. |q*yuK/
*/ L1SKOM$
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package com.tot.count; 4^L;]v,|7
import java.util.*; [Km{6L&
/** F?Lt-a+
* c| ^I}
* @author SsZC g#i
*/ '@t$3
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public class CountCache { T7,]^
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public static LinkedList list=new LinkedList(); `MOw\Z)..
/** Creates a new instance of CountCache */ ;'n%\*+fHH
public CountCache() {} =GX5T(P8k
public static void add(CountBean cb){ 6!m#;8 4
if(cb!=null){ j 2ag
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list.add(cb); &j F'2D^_
} *-nO,K>y`
} Te+(7
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} el9P@r0
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CountControl.java u5oM;#{@-
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/* PEf yHf7`
* CountThread.java }HoCfiE=X
* Fc5.?X-
* Created on 2007年1月1日, 下午4:57 X,k^p[Rcu
* O+}py{ st
* To change this template, choose Tools | Options and locate the template under N#T'}>t y
* the Source Creation and Management node. Right-click the template and choose V+E8{|dYL
* Open. You can then make changes to the template in the Source Editor. 8Sr'
*/ ,UY1.tR(
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package com.tot.count; ks#3
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import tot.db.DBUtils; z{rV|vQ
import java.sql.*; -#|;qFD]
/** <1|[=$w
* Tx;a2:6\[
* @author =NF0E8O
*/ ..)J6L5l
public class CountControl{ dR S:S_
private static long lastExecuteTime=0;//上次更新时间 V"YeF:I
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 A(FnU:
/** Creates a new instance of CountThread */ FCEy1^u
public CountControl() {} [CJ<$R !
public synchronized void executeUpdate(){ ^K?-+
Connection conn=null; d?fS#Ryb
PreparedStatement ps=null; iW` tr
try{ Lnh=y2
conn = DBUtils.getConnection(); >C|pY6
conn.setAutoCommit(false); ojd0um6I{
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ~1uQyt
for(int i=0;i<CountCache.list.size();i++){ >yC=@Uq+
CountBean cb=(CountBean)CountCache.list.getFirst(); U,=f};
CountCache.list.removeFirst(); X4V>qHV72
ps.setInt(1, cb.getCountId()); ;4rhhh&