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: 6G],t)<A'-
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CountBean.java sMK/l @7
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/* Mv3Ch'X[
* CountData.java @@ QU"8q
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* Created on 2007年1月1日, 下午4:44 I\_ R&
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* ;z#9>99rH
* To change this template, choose Tools | Options and locate the template under {JJ`|*H$_
* the Source Creation and Management node. Right-click the template and choose ~S9nLb:O{
* Open. You can then make changes to the template in the Source Editor. C
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*/ |%} ?*|-
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package com.tot.count; NINiX(
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/** gFH_^~7i8p
* N>_7Ltw/
* @author ia[wVxd
*/ Hw
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public class CountBean { Gmb57z&:
private String countType; t
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int countId; -uZ^UG!K
/** Creates a new instance of CountData */ ~+F: QrXcI
public CountBean() {} {mDaK&]Oh
public void setCountType(String countTypes){ 5V0=-K
this.countType=countTypes; ;&!l2 UB%
} =@'"\
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public void setCountId(int countIds){ /zWWUl`:
this.countId=countIds; +-"#GL~cC
} =
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public String getCountType(){ zV]0S o
return countType; pP#?|
} g6farLBF
public int getCountId(){
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return countId; q%"nk
} b#M<b.R)
} *QVE>{
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CountCache.java T]xGE
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/* bu.36\78
* CountCache.java ;"3Mm$
* 4 R]|
* Created on 2007年1月1日, 下午5:01 {:Q2Itsy
* |Yx8Ez
* To change this template, choose Tools | Options and locate the template under :1iw_GhJf
* the Source Creation and Management node. Right-click the template and choose O]>Or3oO
* Open. You can then make changes to the template in the Source Editor. A28w/=e7
*/ 3O.-'U1K
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package com.tot.count; sM-*[Q=_
import java.util.*; MG6Tk(3S
/** \yqiv"'
* |lv4X}H
* @author >@X=E3
*/ 1;h>^NOq
public class CountCache { {MS&t09Wh
public static LinkedList list=new LinkedList(); P+/L,u
/** Creates a new instance of CountCache */ gSC@uf
public CountCache() {} P/_XDP./U
public static void add(CountBean cb){ kU /?#s
if(cb!=null){ xqr`T0!&
list.add(cb); UaBR;v-.B3
} kBTuM"
} \S9z.!7v$
} #O~Y[''C5X
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CountControl.java JsC0^A;fM
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/* 0\mzGfd
* CountThread.java Q -+jG7vT
* ;(sb^O
* Created on 2007年1月1日, 下午4:57 X:Zqgf
* [H&m@*UO
* To change this template, choose Tools | Options and locate the template under kK(633s
* the Source Creation and Management node. Right-click the template and choose )sQbDA|p
* Open. You can then make changes to the template in the Source Editor. Ub"\LUu
*/ " n\!y~:
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package com.tot.count; n5b
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import tot.db.DBUtils; H\S,^)drJ?
import java.sql.*; 29GiNy+ob
/** fVkl-<?x
* BK +JHT
* @author h3:,Gbyap
*/ 4
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public class CountControl{ ]u:NE'0Xy
private static long lastExecuteTime=0;//上次更新时间 5u&jNU5m_
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 mB\5bSFY`
/** Creates a new instance of CountThread */ }N[sydL
public CountControl() {} )*uI/E
public synchronized void executeUpdate(){ r'8e"pTi
Connection conn=null; 3S,pd0;
PreparedStatement ps=null; ex['{|a{
try{ qUo(hbp
conn = DBUtils.getConnection(); @f$P*_G
conn.setAutoCommit(false); A;g[G >J
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); pSAXp#g
for(int i=0;i<CountCache.list.size();i++){ B<)(7GTv7"
CountBean cb=(CountBean)CountCache.list.getFirst(); 8dpVB#]pp,
CountCache.list.removeFirst(); -&&mkK
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ps.setInt(1, cb.getCountId()); P)H%dJ^l
ps.executeUpdate();⑴ emHi=[!i
//ps.addBatch();⑵ WlY%f}ln
} `SVR_
//int [] counts = ps.executeBatch();⑶ Pk,^q8;
conn.commit(); 5!Guf?i
}catch(Exception e){ s)C.e# xl
e.printStackTrace(); =m40{
} finally{ HqbTJ!a
try{ LP87X-qkjW
if(ps!=null) { 9=/8d`r
ps.clearParameters(); WgIVhj
ps.close(); V=c&QPP
ps=null; <sTaXaq?
} ;9^B# aTM
}catch(SQLException e){} 0e:aeLh
DBUtils.closeConnection(conn); &8 (2U-
} N5s_o0K4TU
} f ZISwr
public long getLast(){ _E~uuFMn*R
return lastExecuteTime; OS!47Z /q
} &@RU}DnvM&
public void run(){ # WxH
long now = System.currentTimeMillis(); c(~M<nL0
if ((now - lastExecuteTime) > executeSep) { 5E%W;$3Pb
//System.out.print("lastExecuteTime:"+lastExecuteTime); ^^[,aBu
//System.out.print(" now:"+now+"\n"); l/`Z+];
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 5p~Z-kU&
lastExecuteTime=now; vb%\q sf
executeUpdate(); tpVtbh1)u
} ]6nF>C-C
else{ }vL[N~5\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =?}'\
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} _WkK%RYV
} 4Qw!YI#40$
} Jn&(v"_
//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 |k^X!C 0
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类写好了,下面是在JSP中如下调用。 Ug9o/I@}C
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<% Lt*H|9
CountBean cb=new CountBean(); Ah"RxA
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); !ine|NM
CountCache.add(cb); f(3#5288
out.print(CountCache.list.size()+"<br>"); &38Fj'l
CountControl c=new CountControl(); lmod8B
c.run(); 3:C *'@
out.print(CountCache.list.size()+"<br>"); J/mLB7^R
%>