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: TpRI+*\
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CountBean.java Mz: "p.
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/* UTVqoCHA
* CountData.java )-^[;:B\k"
* W%@0Y m`7
* Created on 2007年1月1日, 下午4:44 -+fW/Uo
* k{J\)z
* To change this template, choose Tools | Options and locate the template under cv"Bhql
* the Source Creation and Management node. Right-click the template and choose JQDS3v=1$
* Open. You can then make changes to the template in the Source Editor. z-JYzxL9
*/ NeR1}W
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package com.tot.count; b8&z~'ieR
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/** "{x+ \Z\
* 6vf<lmN
* @author P~h0Ul
*/ mbXW$E-&R2
public class CountBean { =3|5=ZU034
private String countType; hH_\C.bL
int countId; K'oy6$B
/** Creates a new instance of CountData */ e]@
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public CountBean() {} 0?*":o30
public void setCountType(String countTypes){ .o)
this.countType=countTypes; Sz-TarTF
} D-Q54 "^3
public void setCountId(int countIds){ 7`HKa@
this.countId=countIds; .#LvvAeh
} B4{F)Zb
public String getCountType(){ VJS1{n=;k
return countType; I]Ws
} />O.U?
public int getCountId(){ 4[rX\?^e
return countId; M3s:B& /
} ,U.|+i{
} 0}9
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CountCache.java c/}-pZn<
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/* |?\2F
* CountCache.java H8h,JBg5<F
* grE'ySX0
* Created on 2007年1月1日, 下午5:01 Ygc.0VKMR
* (r/))I9^
* To change this template, choose Tools | Options and locate the template under x,Z:12H0
* the Source Creation and Management node. Right-click the template and choose KouIzWf.
* Open. You can then make changes to the template in the Source Editor. H](TSt<Q"
*/ s]Z++Lh<{
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package com.tot.count; !RwMUnp
import java.util.*; Dv}VmC""
/** l} W">
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* $d
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* @author }b+$S'`Bv
*/ 3w8v.J8q
public class CountCache { K_-S`-eH
public static LinkedList list=new LinkedList(); dG)}H_
/** Creates a new instance of CountCache */ &{S@v9~IT
public CountCache() {} b
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public static void add(CountBean cb){ EO\- J-nM
if(cb!=null){ & sgzSX
list.add(cb); H={5>;8G
} 0}-MWbG
} RY]jY | E
} LRPdA "Z
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CountControl.java oT- Y
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/* IYe ,VL
* CountThread.java K<p)-q
* 9^@#Ua
* Created on 2007年1月1日, 下午4:57 8xx2+
* p{;FO?
* To change this template, choose Tools | Options and locate the template under ; g\rY
* the Source Creation and Management node. Right-click the template and choose {i)FDdDGD
* Open. You can then make changes to the template in the Source Editor. ^t P|8k
*/ K QCF "
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package com.tot.count; +K48c,gt?
import tot.db.DBUtils; BP=<TRp.
import java.sql.*; .2SD)<}(9
/** /\m>PcPa
* nBtKSNT#Q
* @author j9|1G-CM
*/ `t2Y IwOK
public class CountControl{ "cGjHy\j`
private static long lastExecuteTime=0;//上次更新时间 e\! ic
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 vq1u!SY
/** Creates a new instance of CountThread */ D:XjJMW3r
public CountControl() {} .F@ 2C
public synchronized void executeUpdate(){ 4K$_d,4`U
Connection conn=null; 07>Iq8<mu
PreparedStatement ps=null; H'jo3d~+
try{ F+9(*|x%
conn = DBUtils.getConnection(); j5m]zh5\J=
conn.setAutoCommit(false); ye`-U?7.
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 4#ZZwa]y
for(int i=0;i<CountCache.list.size();i++){ {
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CountBean cb=(CountBean)CountCache.list.getFirst(); 6f&qtJQ<A
CountCache.list.removeFirst();
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ps.setInt(1, cb.getCountId()); ?{r -z3@ N
ps.executeUpdate();⑴ Q\aC:68
//ps.addBatch();⑵ ),I g u
} AizLzR$OG
//int [] counts = ps.executeBatch();⑶ JxlZ,FF$@
conn.commit(); qTV.DCP
}catch(Exception e){ )odz/\9n3c
e.printStackTrace(); |\N))K-2D
} finally{ du&9mOrr
try{ 6,(S}x
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if(ps!=null) { lGX8kAv?
ps.clearParameters(); K*N8Vpz(
ps.close(); [q~3$mjQ
ps=null; 3PEW0b*]Pf
} 5c1{[
}catch(SQLException e){} U)D}J_Zi(
DBUtils.closeConnection(conn); +,J!xy+~,
} vO8CT-)
} ~;I'.TW
public long getLast(){ 8xYeaK
return lastExecuteTime; E]ZIm
} 7%i6zP/a
public void run(){ 8)="Ee
long now = System.currentTimeMillis(); Cf3<;Mp<
if ((now - lastExecuteTime) > executeSep) { -o YJ&r
//System.out.print("lastExecuteTime:"+lastExecuteTime); 9O-*iK
//System.out.print(" now:"+now+"\n"); Rzxkz
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); @Wd1+Yky
lastExecuteTime=now; x%55:8{
executeUpdate(); W=2#Q2)
} I1W~;2cK
else{ goc"+K
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); NQ,2pM<*-
} 9C| -|mo
} 3j w4#GW
} yi,Xs|%.
//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 bqRO-\vO
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类写好了,下面是在JSP中如下调用。 F*=}}H/
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<%
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CountBean cb=new CountBean(); %RXFgm!{f
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 2Y%E.){
CountCache.add(cb); J pKCux
out.print(CountCache.list.size()+"<br>"); 3.@ir"vy
CountControl c=new CountControl(); j\2q2_f
c.run(); 9Nu:{_YoP
out.print(CountCache.list.size()+"<br>"); K<fB]44Y
%>