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: 'u` .P:u?
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CountBean.java *~/OOH$"
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/* $\k0Nup}
* CountData.java =rR~ `
* DvM5 k
* Created on 2007年1月1日, 下午4:44 ZR\VCVH\^
* 21(p|`X
* To change this template, choose Tools | Options and locate the template under sFBneBub
* the Source Creation and Management node. Right-click the template and choose &[hLzlrg
* Open. You can then make changes to the template in the Source Editor. vp(;W,ba:|
*/ #b7$TV
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package com.tot.count; =f(cH152T
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/**
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* +<prgP`v
* @author ;us%/kOR
*/ eX_D/25 $
public class CountBean { P+)DsZ0ig
private String countType; s#uJ
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int countId; "l >Igm
/** Creates a new instance of CountData */ ujJI
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public CountBean() {} `
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public void setCountType(String countTypes){ "YB**Y
this.countType=countTypes; ?3O9eZY@
} C4}*)a
public void setCountId(int countIds){ YSaJeU>@
this.countId=countIds; (|d34DOJ
} {vo +gRYYv
public String getCountType(){ +x1eJug4
return countType; O 1oxZj
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} A_;8IlW
public int getCountId(){ j:w{;(1=W
return countId; apk4j\i?5
} ,<A$h3*
}
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CountCache.java fo4.JyBk
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/* /\)a
* CountCache.java @x/T&67k
* ;=? ~
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* Created on 2007年1月1日, 下午5:01 FW"^99mrnb
* "6a8s;
* To change this template, choose Tools | Options and locate the template under W(hMft%
* the Source Creation and Management node. Right-click the template and choose z]3 `*/B
* Open. You can then make changes to the template in the Source Editor. %_UN<a
*/ [TCP-bU
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package com.tot.count; Va$Pi19 O
import java.util.*; -LM;}<
/** hva2o`
* +`uY]Q,O
* @author ^;c 16
*/ Uje|`<X
public class CountCache { ?GTU=gpQ
public static LinkedList list=new LinkedList(); +I>p !v
/** Creates a new instance of CountCache */ 'q * Bdx
public CountCache() {} P00f6
public static void add(CountBean cb){ $v8l0JA *
if(cb!=null){ -TZ p
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list.add(cb); >]%8Zx[
} i55x`>]&sb
} [&*6_q"V
} Ix|~f1*%
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CountControl.java {m`A!qcD|
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/* @/&b;s73
* CountThread.java ESoAzo,u
* +\"-P72vjk
* Created on 2007年1月1日, 下午4:57 gDIBnH
* ?RzD Qy D
* To change this template, choose Tools | Options and locate the template under kw`WH)+F
* the Source Creation and Management node. Right-click the template and choose <ER'Ed
* Open. You can then make changes to the template in the Source Editor. k0Ek:MjJr
*/ nv<` K9d
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package com.tot.count; r ]>\~&?^F
import tot.db.DBUtils; R4Rb73o
import java.sql.*; ,p;_\\<
/** VYw%01#
* _p?s9&
* @author FecktD=
*/ +}Av-47`h
public class CountControl{ a iCn"j
private static long lastExecuteTime=0;//上次更新时间 dO7;}>F$n
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 xmGk*W)P
/** Creates a new instance of CountThread */ KS*oxZ
public CountControl() {} ]4 (?BJ
public synchronized void executeUpdate(){ [ $fJRR
Connection conn=null; Z X~
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PreparedStatement ps=null; ~L7:2weV[
try{ &:=$wc
conn = DBUtils.getConnection(); 3/JyUh?
conn.setAutoCommit(false); vs6,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I^Z8PEc+
for(int i=0;i<CountCache.list.size();i++){ 2l5KJlfj>k
CountBean cb=(CountBean)CountCache.list.getFirst(); ;W:6{9m ze
CountCache.list.removeFirst(); oVCmI"'
ps.setInt(1, cb.getCountId()); I?Q+9Rmm`J
ps.executeUpdate();⑴
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//ps.addBatch();⑵ F>gmj'-^
} V^Rkt%JY
//int [] counts = ps.executeBatch();⑶ tZ2e!<C
conn.commit(); D@X+{
}catch(Exception e){ /XS&d%y
e.printStackTrace(); amQz^^
} finally{ &W }<:WH~
try{ ^6p'YYj"5
if(ps!=null) { ~2u\
ps.clearParameters(); buk=p-oi
ps.close(); l2hG$idC
ps=null; x|eeRf|
} s~26
}catch(SQLException e){} @6o]chJo
DBUtils.closeConnection(conn); djT5X
} d77r9
} -v?hqWMp#
public long getLast(){ 7t-Lz|
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return lastExecuteTime; }%{MPqg
} {F|48P;J
public void run(){ .I$}KE)
long now = System.currentTimeMillis(); ^;F{)bmu+)
if ((now - lastExecuteTime) > executeSep) { ;HOPABWz)
//System.out.print("lastExecuteTime:"+lastExecuteTime); #ZiT-
//System.out.print(" now:"+now+"\n"); y|_Eu:
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); OY"6J@[z
lastExecuteTime=now; p2x [p
executeUpdate(); VF0dE
} 6gOe!mm
else{ 59Sw+iZj
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); NHX>2-b
} wHsB,2H
} u~Tg&0V30
} 9h(IUD{8
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 `Iy4=nVb
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类写好了,下面是在JSP中如下调用。 b~7drf
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<% 0_eQlatb
CountBean cb=new CountBean(); ?TEK=mD#u
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); -T/W:-M(
CountCache.add(cb); AH{^spD{7,
out.print(CountCache.list.size()+"<br>"); G%TL/Z40
CountControl c=new CountControl(); Ua*&_~7kJ
c.run(); _>bRv+RVR
out.print(CountCache.list.size()+"<br>"); TA}UY7v
%>