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: qy3@>
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CountBean.java G*@!M%/
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/* VWE>w|'
* CountData.java ;[Mvk6^'R
* 9KXL6#h
* Created on 2007年1月1日, 下午4:44 :h{uZ,#Gi
* z~ C8JY:
* To change this template, choose Tools | Options and locate the template under VX$WL"A
* the Source Creation and Management node. Right-click the template and choose u##th8h4U
* Open. You can then make changes to the template in the Source Editor. T^1
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*/ 8#7qHT;cx
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package com.tot.count; Tf86CH=)5
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/** CP~ZIIip"
* \x}\)m_7M<
* @author cg MF?;V
*/ sF{aG6u
public class CountBean { m$W>~
private String countType; E&P2E3P
int countId; g|>LT_
/** Creates a new instance of CountData */ sCFxn
public CountBean() {} i3,IEN
public void setCountType(String countTypes){ (aa2uctTn
this.countType=countTypes; gYB!KM *v
} W[\6h Zv
public void setCountId(int countIds){ G@k]rwub
this.countId=countIds; Dw%'u'HG
} 43PLURay
public String getCountType(){ !ajBZ>Q
return countType; >[fu&r1
} <(xqw<)
public int getCountId(){ C!VhVOy>d
return countId; Q\N*)&Sd<M
} K& #il
} q!ZM Wg
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CountCache.java B.q/}\
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/* s<s}6|Z
* CountCache.java )L:zr#
* r/j:A#6M]o
* Created on 2007年1月1日, 下午5:01 "b} mVrFh
* 8s1nE_3
* To change this template, choose Tools | Options and locate the template under +OE!Uqnt
* the Source Creation and Management node. Right-click the template and choose !D#"+&&G8
* Open. You can then make changes to the template in the Source Editor. h_%q`y ,
*/ .^Sglo
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package com.tot.count; 7IX8ck[D
import java.util.*; v>8C}d^
/** OETo?Wg1Z
* 3p0v
* @author >h\y1IrAaG
*/ 7n7Xyb
public class CountCache { K^u,B3
public static LinkedList list=new LinkedList(); {R}F4k
/** Creates a new instance of CountCache */ ^_WR) F'K
public CountCache() {} !dLu($P
public static void add(CountBean cb){ :@(('X(".
if(cb!=null){ uJw?5kEbv<
list.add(cb); mZ+!8$1X
} +A|
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} ;c!> =
} v e&d"8+]
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CountControl.java e\%,\uV}
}"D;?$R!
/* yw^Pok5.
* CountThread.java #Rw!a#CX.
* QAs)zl0
* Created on 2007年1月1日, 下午4:57 a(gXvgrf[
* n'~==2
* To change this template, choose Tools | Options and locate the template under ?doI6N0T
* the Source Creation and Management node. Right-click the template and choose YX$(Sc3.6
* Open. You can then make changes to the template in the Source Editor. f3K-X1`]'U
*/ 8 A>OQR
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package com.tot.count; `YNzcn0x
import tot.db.DBUtils; D=e*rrL7a
import java.sql.*; 4V@%Y,:ee
/** Q:A#4Z
* nLN0zfhE#
* @author HpnF,4A>
*/ )w7vE\n3
public class CountControl{ 3~>-A=
private static long lastExecuteTime=0;//上次更新时间 @j!,8JQEd
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 n7[nl43
/** Creates a new instance of CountThread */ b>ai"!
public CountControl() {} 4agW<c#
public synchronized void executeUpdate(){ dY8 H2;
Connection conn=null; I,-n[k\J
PreparedStatement ps=null; [l}H:%O,
try{ Hjm> I'9
conn = DBUtils.getConnection(); c]6b|mHT
conn.setAutoCommit(false); 6S`_L
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 'RjEdLrI
for(int i=0;i<CountCache.list.size();i++){ 1&w%TRC2x
CountBean cb=(CountBean)CountCache.list.getFirst(); 7^eyO&4z
CountCache.list.removeFirst(); JipNI8\r
ps.setInt(1, cb.getCountId()); %3z[;&*3O
ps.executeUpdate();⑴ Rl?1|$%
//ps.addBatch();⑵ .9J^\%JD
} -CvmZ:n
//int [] counts = ps.executeBatch();⑶ <V ?2;Gy
conn.commit(); _2fW/U54_
}catch(Exception e){ ..N6]u
e.printStackTrace(); p6DI7<C<H
} finally{ };Q}C0E
try{ cMT7Bd
if(ps!=null) { cYSn
ps.clearParameters(); =H{<}>W'
ps.close(); 7`|'Om?'
ps=null; R@c] )\^]
} > Pw5!i\
}catch(SQLException e){} \e86'&
DBUtils.closeConnection(conn); (0{Dn5MH
} XGa8tI[:X
} q5f QTV
public long getLast(){ ]#o;`5'
return lastExecuteTime; hek+zloB+
} iOiFkka
public void run(){ 6n9/`D!
long now = System.currentTimeMillis(); yYz{*hq
if ((now - lastExecuteTime) > executeSep) { "f91YX_)
//System.out.print("lastExecuteTime:"+lastExecuteTime); MJ}{Q1|*
//System.out.print(" now:"+now+"\n"); FLmD?nw
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); q{w|`vIb
lastExecuteTime=now; <*5S7)]BP
executeUpdate(); wB)y@w4k
} ;[y( 14g
else{ um9&f~M
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ]it.
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} 7y
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} hz/mNDE]
} U$y9f
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 G&oD;NY@/
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类写好了,下面是在JSP中如下调用。 z^9oaoTl
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<% 7$*E0
CountBean cb=new CountBean(); Tvv>9gS
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); r_+Vb*|Y
CountCache.add(cb); =%U&$d|@G
out.print(CountCache.list.size()+"<br>"); 6wp1jN
CountControl c=new CountControl(); 3zsp6k V
c.run(); .gO|=E"
out.print(CountCache.list.size()+"<br>"); gSFZ>v*6
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