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: 9rT"_d#
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CountBean.java _.SpU`>/f
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/* )-25?B
* CountData.java `tl -] ^Y2
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* Created on 2007年1月1日, 下午4:44 qf{HGn_9~1
* mv(/M
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* To change this template, choose Tools | Options and locate the template under ^grDP*;W
* the Source Creation and Management node. Right-click the template and choose UkC'`NWF*
* Open. You can then make changes to the template in the Source Editor. *T:jR
*/ m",G;VN
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package com.tot.count; ."`||@|
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/** t;_1 /mt
* (*\y
* @author A:5P
*/ X,D ]S@
public class CountBean { w{GEWD{&
private String countType; kB=5=#s
int countId; %Lq}5zB
/** Creates a new instance of CountData */ ypx`!2Q$
public CountBean() {} olK*uD'`
public void setCountType(String countTypes){ "+hUt
this.countType=countTypes; ^1Bk*?Yx\x
} \!*F:v0g^
public void setCountId(int countIds){ |7!B k$(vA
this.countId=countIds; $)'LbOe
} ?',Wn3A
public String getCountType(){ \\35}
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return countType; XnRm9%
} ^=qV)j
public int getCountId(){ Omph(
return countId; ri4:w_/{,Y
} qJR8fQ
} m/`L3@7Tt
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CountCache.java .ZM0cwF
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/* ""h%RhcZ\
* CountCache.java FA;B:O@:'
* JvS
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* Created on 2007年1月1日, 下午5:01 KVoM\ttP
* bnV)f<
* To change this template, choose Tools | Options and locate the template under TJuS)AZ
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* the Source Creation and Management node. Right-click the template and choose /mwDVP<z /
* Open. You can then make changes to the template in the Source Editor. Bo
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*/ a~zh5==QD
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package com.tot.count; GE\({V.W
import java.util.*; %h
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/** ~eUv.I/
* ;|f]e/El
* @author |RDE/
*/ c$_}
public class CountCache { l>)+HoD
public static LinkedList list=new LinkedList(); jEK{47i v
/** Creates a new instance of CountCache */ 2
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public CountCache() {} ,/[1hhP@
public static void add(CountBean cb){ Ld=6'C8ud
if(cb!=null){ Vc+~yh.)
list.add(cb); ;}k_
} M->#WGl\B
} f|2QI~R
} ,.&D{$1W
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CountControl.java z'0
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/* 2t7=GA+j
* CountThread.java [ *
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* Created on 2007年1月1日, 下午4:57 fLV@~T|
* ][~rk?YY
* To change this template, choose Tools | Options and locate the template under y/+y |.Xg
* the Source Creation and Management node. Right-click the template and choose uNpa2{S'
* Open. You can then make changes to the template in the Source Editor. LtNspFoLb
*/ SA
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package com.tot.count; /}s#
import tot.db.DBUtils; '(8}
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import java.sql.*; ryTtGx%a
/** l{V(Y$xp3
* zF&_9VNk=c
* @author .iST!nh
*/ %@%~<U)W
public class CountControl{ ;!EEzR.
private static long lastExecuteTime=0;//上次更新时间 ppO!v?
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 p&HkR^.S
/** Creates a new instance of CountThread */ c32"$g
public CountControl() {} %}{.U
public synchronized void executeUpdate(){ U)1hC^[!
Connection conn=null; =BzBM`-o
PreparedStatement ps=null; (dym*_J
try{ ,;yaYF6|/
conn = DBUtils.getConnection(); t<cWMx5ra
conn.setAutoCommit(false); &pAmFe
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); IOl0=+p
for(int i=0;i<CountCache.list.size();i++){ f1t?<=3Ek<
CountBean cb=(CountBean)CountCache.list.getFirst(); !KHbsOT?9
CountCache.list.removeFirst(); ;\iu*1>Z,&
ps.setInt(1, cb.getCountId()); @! jpJ}
ps.executeUpdate();⑴ Y }8HJTMB
//ps.addBatch();⑵ DhG{hQ[[
} @>[3[;
//int [] counts = ps.executeBatch();⑶ UQjZhH
conn.commit(); RI]x=
}catch(Exception e){ b =:%*gq,
e.printStackTrace(); o|V=3y
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} finally{ qtp-w\#S$
try{ C(}Kfi@6N
if(ps!=null) { dkZ[~hEQG-
ps.clearParameters(); V}Pv}j:;
ps.close(); bbWW|PtWwP
ps=null; Zy6>i2f4f
} ))J#t{X/8v
}catch(SQLException e){} a1ai?},
DBUtils.closeConnection(conn); [V;Q#r&+
} I5g!c|#y
} M
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public long getLast(){
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return lastExecuteTime; N ^H
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} T7*p!0
public void run(){ wVUm!Y
long now = System.currentTimeMillis(); XMpE|M!c
if ((now - lastExecuteTime) > executeSep) { QB7^8O!<
//System.out.print("lastExecuteTime:"+lastExecuteTime); h'A
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//System.out.print(" now:"+now+"\n"); |l,0bkY@&
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); m_UzmWF
lastExecuteTime=now; &-|(q!jm
executeUpdate(); a6g+"EcH#'
} r
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else{ AaJz3oncJ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); OWmI$_L
} 0f,Ii_k bT
} <:~'s]`zf
} d'p@[1/
//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 nAyyjd3!S
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类写好了,下面是在JSP中如下调用。 E\~!E20^
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<% 6CzN[R}
CountBean cb=new CountBean(); k7bfgb{
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 3yM!BTlX
CountCache.add(cb); "C]_pWk
out.print(CountCache.list.size()+"<br>"); 0EUC8Ni
CountControl c=new CountControl(); '>UQsAvm
c.run(); RZI4N4o
out.print(CountCache.list.size()+"<br>"); (M,*R
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%>