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: _=EKXE)&}
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CountBean.java O_;Dk W
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/* R)5n 8
* CountData.java !GwL,)0@^
* -Z0+oU(?YE
* Created on 2007年1月1日, 下午4:44 J !HjeZ
* g(Yb^'X/
* To change this template, choose Tools | Options and locate the template under *?t%0){
* the Source Creation and Management node. Right-click the template and choose A"uULfnk
* Open. You can then make changes to the template in the Source Editor. 65TfFcQ<S
*/ &GhPvrxI?
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package com.tot.count; )Si2u5
Ps4 ZFX
/** wN=;i#
* z6*<V5<7
* @author 3jZ6kfj
*/ Y32 "N[yw
public class CountBean { $}GTG'*.
private String countType; F;q#&
int countId; M.q=p[
/** Creates a new instance of CountData */ a5jL7a?6]
public CountBean() {} -WJ?:?'
public void setCountType(String countTypes){ F$V/K&&W
this.countType=countTypes; !do?~$Og
} hK|j6xf.o
public void setCountId(int countIds){ #%lo;W~IY
this.countId=countIds; +4))/`DA
} o0bM=njok
public String getCountType(){ 5!X1G8h)uy
return countType; O|kOI?f
} 9?<{_'
public int getCountId(){ K`g7$r)U[
return countId; 3g~'5Ao
} Cbm\h/PXl
} `aC){&AP(
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CountCache.java #,d I$gY
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/* vBcq_sbo
* CountCache.java Pe;Y1Qq>>
* eE
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* Created on 2007年1月1日, 下午5:01 vy9 w$ls
* jszK7$]^
* To change this template, choose Tools | Options and locate the template under [ic 870_
* the Source Creation and Management node. Right-click the template and choose O@V%Cu
* Open. You can then make changes to the template in the Source Editor. f+_h !j
*/ Z?5V4F:f
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package com.tot.count; 457\&
import java.util.*; `Ag{)
/** n+;6=1d7ZW
* 'Ft0Ry<OL
* @author U1nw-Q+
*/ "VG+1r+]4
public class CountCache { %Dg0fL
public static LinkedList list=new LinkedList(); ^(HUGl_
/** Creates a new instance of CountCache */ }7E^ZZ]f
public CountCache() {} ~*A8+@\R
public static void add(CountBean cb){ 4)|8Eu[p7
if(cb!=null){ phnV7D(E
list.add(cb); !K
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} aFz5leD
} G s+3e8
} Eow_WW;P
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CountControl.java L|P5=/d
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/* aE;le{|!({
* CountThread.java scLn=
* fk1ASV<rN
* Created on 2007年1月1日, 下午4:57 Ez|oN,
* #txE=e"&o
* To change this template, choose Tools | Options and locate the template under /+Lfrt
* the Source Creation and Management node. Right-click the template and choose AV9m_hZt
* Open. You can then make changes to the template in the Source Editor. |KSy`lY-j>
*/ 7Mb#O_eh
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package com.tot.count; S"wR%\NIp
import tot.db.DBUtils; %LVm3e9
import java.sql.*; [W%$qZlP
/** 8V^oP]Y
* x8S7oO7
* @author -gSUjP
*/ ])xx<5Jt4
public class CountControl{ h$4Hw+Yxs]
private static long lastExecuteTime=0;//上次更新时间 h%}/Cmx[
private static long executeSep=60000;//定义更新间隔时间,单位毫秒
A);
/** Creates a new instance of CountThread */ sl]_M
public CountControl() {} R"
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public synchronized void executeUpdate(){ ; ;L[e]Z
Connection conn=null; 1
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PreparedStatement ps=null; }:X*7 n(&
try{ 3|.um_
conn = DBUtils.getConnection(); \jOA+FU[
conn.setAutoCommit(false); bFe+m1Q_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); H,Z;=N_
for(int i=0;i<CountCache.list.size();i++){ r E}%KsZ
CountBean cb=(CountBean)CountCache.list.getFirst(); Jn{OWw2
CountCache.list.removeFirst(); .C 8PitS
ps.setInt(1, cb.getCountId());
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ps.executeUpdate();⑴ =c/wplv*
//ps.addBatch();⑵ }ZYv~E'
} fQ#l3@in
//int [] counts = ps.executeBatch();⑶ +L7n<