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: \"5 \hX~dS
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CountBean.java k&Sg`'LG8
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/* _PuMZjGL
* CountData.java 2 `#|;x^<
* J%nJO3,
* Created on 2007年1月1日, 下午4:44 X/@Gx 4
* pgI@[zp7
* To change this template, choose Tools | Options and locate the template under ;m\E9ple
* the Source Creation and Management node. Right-click the template and choose NY_Oo!)3
* Open. You can then make changes to the template in the Source Editor. <4Ak$E%"
*/ !a0HF p$9
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package com.tot.count; M+Dkn3bx
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/** $XJe)
* 9AS,-5;XQ
* @author ,7eN m>$
*/ j@9A!5<CCk
public class CountBean { }!2|*Y
private String countType; L,R9jMx?_
int countId; bO-8<IjC_3
/** Creates a new instance of CountData */ ==$Ox6.
public CountBean() {} FC(m)S2
public void setCountType(String countTypes){ l9n8v\8,o
this.countType=countTypes; &4]%&mX)-
} fz:F*zT1
public void setCountId(int countIds){ w=OT^d 9n
this.countId=countIds; wTOB'
} \"n&|_SZ\
public String getCountType(){ 2(UT;PSI
return countType; 0\.y0
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} WC`<N4g|
public int getCountId(){ n] &fod
return countId; :^l`m9
} 0^hz 1\g
} 1y>P<[
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CountCache.java 7^S &g.A
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/* y1P ?A]v
* CountCache.java wjY3:S~
* X\M0Q%8
* Created on 2007年1月1日, 下午5:01 N!hp^V<7
* zVp|%&
* To change this template, choose Tools | Options and locate the template under X^"95Ic
* the Source Creation and Management node. Right-click the template and choose eGZIdv1
* Open. You can then make changes to the template in the Source Editor. n}a# b%e
*/ (xq25;|Y
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package com.tot.count; N-lXC"{)
import java.util.*; 8^+Qn/b_%
/** t:W`=^
* c D7q;|+
* @author $lUZm\R|k
*/ lxV>
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public class CountCache { qxk1Rzm?x
public static LinkedList list=new LinkedList(); $vicxE~-E
/** Creates a new instance of CountCache */ O(CUwk
public CountCache() {} 1#XMUbFc
public static void add(CountBean cb){ VYvHpsI
if(cb!=null){ *S*;rLH9c
list.add(cb); %]d^B|
}
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} 0YW<>Y`6
} .{~ygHQ`f
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CountControl.java Hz28L$
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/* Ktg6 *L/
* CountThread.java )J5(M`
* J/=b1{d"n
* Created on 2007年1月1日, 下午4:57 E}yl@8g:#
* r*y4Vx7
* To change this template, choose Tools | Options and locate the template under 'Ko
T8g\b
* the Source Creation and Management node. Right-click the template and choose 2#ypM 9
* Open. You can then make changes to the template in the Source Editor. aZ- )w
*/ zPZy#7/A
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package com.tot.count; J/WPffqD
import tot.db.DBUtils; vA"yy"B+ V
import java.sql.*; dfO84Z}
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/** iw<+rh*C
* J$@3,=L6V
* @author -&%#R_RV
*/ L/#^&*'B
public class CountControl{ A03,X;S+
private static long lastExecuteTime=0;//上次更新时间 n`;=^^ B
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 HP"5*C5D
/** Creates a new instance of CountThread */ *b~$|H-\
public CountControl() {} p e |k}{
public synchronized void executeUpdate(){ rWAJL9M
Connection conn=null; OlQ7Yi>
PreparedStatement ps=null; =l?5!f9
try{ @/yef3
conn = DBUtils.getConnection(); [iB`- dE,
conn.setAutoCommit(false); 67%o83\
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); m'@NF--#Oq
for(int i=0;i<CountCache.list.size();i++){
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CountBean cb=(CountBean)CountCache.list.getFirst(); #|xK>;
CountCache.list.removeFirst(); nu|;(ly
ps.setInt(1, cb.getCountId()); %Gh!h4Pv
ps.executeUpdate();⑴ @'jC>BS8`
//ps.addBatch();⑵ !Zlvz%X
} ney6N@
//int [] counts = ps.executeBatch();⑶ ){ArZjG>
conn.commit(); [$
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}catch(Exception e){ ESL(Mf'
e.printStackTrace();
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} finally{ I~gU3(
try{ ="JLUq*]s
if(ps!=null) { !*'uPw:l2
ps.clearParameters(); Sc`W'q^X
ps.close(); =T|Z[/fto
ps=null; Tz:mj
} rq:R6e
}catch(SQLException e){} /2tgxm$}
DBUtils.closeConnection(conn); Xq` '^)
} cEhwv0f!qS
} uR"(0_
public long getLast(){ UW88JA0
return lastExecuteTime; $
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} VMe~aUd
public void run(){ IJhJfr0)Oo
long now = System.currentTimeMillis(); E}00y%@*J
if ((now - lastExecuteTime) > executeSep) { $&