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: I%T+H[,
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CountBean.java -&/?&{Q0
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/* -#\ T
* CountData.java &;PxDlY5
* 8Km&3nCv$Q
* Created on 2007年1月1日, 下午4:44 G ek?+|m
* L%/RD2LD
* To change this template, choose Tools | Options and locate the template under L8 P0bNi
* the Source Creation and Management node. Right-click the template and choose LuS@Kf8N+
* Open. You can then make changes to the template in the Source Editor. bZowc {!\
*/ *xnZTj:
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package com.tot.count; Z-@nXt
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/** N/a4Gl(
* |Ajd$+3
* @author J;4x$BI
*/ UP](1lAf
public class CountBean { %
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private String countType; Mh%{cLM
int countId; mWviWHK
/** Creates a new instance of CountData */ *i"9D:
public CountBean() {} xm m,-u
public void setCountType(String countTypes){ o/AG9|()4
this.countType=countTypes; ~j!n`#.\
} i"Jy>'
public void setCountId(int countIds){ P\"kr?jZP
this.countId=countIds; T?3Q<[SmI
} J= A)]YE
public String getCountType(){ [S6u:;7
return countType; fUw:jExz
} "Q: Gd6?h;
public int getCountId(){ x^s,<G
return countId; f;E#CjlTL
} t{})6
}
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CountCache.java k1Y\g'1
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/* [RF,0>^b
* CountCache.java Wn<?_}sa|z
* A7 RI&g
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* Created on 2007年1月1日, 下午5:01 *HrEh;3^J
* }*x1e_m}H
* To change this template, choose Tools | Options and locate the template under QqM[W/&R
* the Source Creation and Management node. Right-click the template and choose P(T-2Ux6
* Open. You can then make changes to the template in the Source Editor. Ca-"3aQkc
*/ f2gtz{r
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package com.tot.count; KhjC'CU,
import java.util.*; `Vvi]>,cg`
/** ^G4YvS(
* TQR5V\{&%
* @author CJ<nUIy'z
*/ y|LHnNQ
public class CountCache { cAR
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public static LinkedList list=new LinkedList(); k*1Lr\1
/** Creates a new instance of CountCache */ \M`qaFan5^
public CountCache() {} +wi=IrRr
public static void add(CountBean cb){ zTng]Mvx
if(cb!=null){ lZk
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list.add(cb); CE"/&I
} .s{"NqRA
} x`6MAZ
} LOU P
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CountControl.java p4T$(]7
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/* '_v~+
* CountThread.java V%-hP~nyBx
* qda 2
* Created on 2007年1月1日, 下午4:57 ebA:Sq:w
* dIC\U
* To change this template, choose Tools | Options and locate the template under 0)&!$@HW
* the Source Creation and Management node. Right-click the template and choose x%dny]O1;
* Open. You can then make changes to the template in the Source Editor. #Y5k/NPg
*/ GvVkb=="
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package com.tot.count; J;& y?%{@5
import tot.db.DBUtils; 66val"^W
import java.sql.*; [Uup5+MCv
/** EL,k z8
* ztVTXI%Kz
* @author e!VtDJDS
*/ 9evr!=":
public class CountControl{ n>ryS/1
private static long lastExecuteTime=0;//上次更新时间 '/O:@P5qY
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 MCN>3/81
/** Creates a new instance of CountThread */ ']k<'`b|
public CountControl() {} FJvY`zqB
public synchronized void executeUpdate(){ HXq']+iC
Connection conn=null; %+*=Vr
PreparedStatement ps=null; VR(R.
try{ |4\1V=(
conn = DBUtils.getConnection(); [t4v/vQT
conn.setAutoCommit(false); sVyV|!K
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); r;Sk[Y5#
for(int i=0;i<CountCache.list.size();i++){ KZKE&bTx
CountBean cb=(CountBean)CountCache.list.getFirst(); :T-DxP/
CountCache.list.removeFirst(); +bumWOQ'
ps.setInt(1, cb.getCountId()); Odwe1q&
ps.executeUpdate();⑴ oSCaP,P
//ps.addBatch();⑵ 2yA)SGri
} W
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//int [] counts = ps.executeBatch();⑶ ~qinCIj
conn.commit(); 9c^ ,v_W@
}catch(Exception e){ ~0MpB~ {xd
e.printStackTrace(); =E9\fRGU
} finally{ YTTyMn
try{ %IsodtkDu
if(ps!=null) {
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ps.clearParameters(); D:T]$<=9
ps.close(); i{^T;uAE
ps=null; wOAR NrPx2
} ]dUG=dWO
}catch(SQLException e){} _a$qsY
DBUtils.closeConnection(conn); ^xe+(83S2?
} @!`__>K
} T;6M UmyC
public long getLast(){ 'AA9F$Dz
return lastExecuteTime; atyvo0fNd
} 4!dc/K
public void run(){ XPd mz !,b
long now = System.currentTimeMillis(); kqBZsfF
if ((now - lastExecuteTime) > executeSep) { U3_${
//System.out.print("lastExecuteTime:"+lastExecuteTime); -8l<5g7
//System.out.print(" now:"+now+"\n"); Qx)b4~F?
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); *(9Tl]w
lastExecuteTime=now; >jt2vU@t.
executeUpdate(); X%yG{\6:
} :[CV_ME.;
else{ }$_@yt<{W@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 8?Zhh.
} ]PS`"o,pF$
} 9@|52dz%
} 9nR\7!_
//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 .!3e$mhV
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类写好了,下面是在JSP中如下调用。 %7ngAIg
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<% Qu|CXUk
CountBean cb=new CountBean(); =F+v+zP7P
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); v~mVf.j1
CountCache.add(cb); z:\9t[e4
out.print(CountCache.list.size()+"<br>"); p@jw)xI
CountControl c=new CountControl(); i.mv`u Dm
c.run(); M@ U>@x;
out.print(CountCache.list.size()+"<br>"); OjGI
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%>