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: }$-VI\96
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CountBean.java U]|q4!WE
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/*
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* CountData.java 6"7qZq
* z'lNO| nU
* Created on 2007年1月1日, 下午4:44 Ro<kp8
* aW"!bAdx`,
* To change this template, choose Tools | Options and locate the template under zjA/Z(
* the Source Creation and Management node. Right-click the template and choose c
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* Open. You can then make changes to the template in the Source Editor. *3$,f>W^
*/ HhvG#Sam!
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package com.tot.count; z (3"\ ^T
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/** MxR U6+a
* q3F5\6aN
* @author 9HX+sB
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*/ {n]sRz
public class CountBean { H#inr^Xa
private String countType; E: GJ$I
int countId; $J6.a!5IE
/** Creates a new instance of CountData */ .jp]S4~
public CountBean() {} \#aVu^`eX
public void setCountType(String countTypes){ ?^~"x.<nr
this.countType=countTypes; yUO|3ONT
} {ZXC%(u
public void setCountId(int countIds){ PoJ$%_a}
this.countId=countIds; $hSZ@w|IF
} :,m)D775S
public String getCountType(){ BuTIJb+Q\
return countType; H|UL5<:]D
} %z~U@Mka
public int getCountId(){ ^d80\PXz
return countId; :eW~nI.Vc
} =[JN'|Q+
} SbZt\a 8
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CountCache.java cA?
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/* xV#a(>-4
* CountCache.java Hc]1mM
* rf->mk{
* Created on 2007年1月1日, 下午5:01 f_ztnRw
* /y)"j#-eW
* To change this template, choose Tools | Options and locate the template under |A0$XU{
* the Source Creation and Management node. Right-click the template and choose y.p6%E_`
* Open. You can then make changes to the template in the Source Editor. 8/"|VE DOr
*/ V=&,^qZ
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package com.tot.count; -j_I_
import java.util.*; :(>9u.>l?5
/** -l H>8+
* | ",[C3Jg
* @author OZD!#YI
*/ R9h>I3F=c
public class CountCache { {~fCqP.2
public static LinkedList list=new LinkedList(); Cc)P5\jh
/** Creates a new instance of CountCache */ *O>aqu
public CountCache() {} UglG!1L
public static void add(CountBean cb){ A&c@8
if(cb!=null){ ]^9*
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list.add(cb); y?n2`l7f
} =`~Z@IbdI
} t3t0vWE<,
} i 1I>RK
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CountControl.java GWhAjL/N
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/* >}b6J7_
* CountThread.java IzdTXc
f
* tRnW%F5
* Created on 2007年1月1日, 下午4:57 {Y91vXTz7
* 6@q[tN7_^
* To change this template, choose Tools | Options and locate the template under oL'1Gm@X?
* the Source Creation and Management node. Right-click the template and choose .3<IOtD=
* Open. You can then make changes to the template in the Source Editor. Jh4&Qh|t
*/ 3;MjO*-
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package com.tot.count; EB5_;
import tot.db.DBUtils; Hpi%9SAM
import java.sql.*; `n`"g<K)Q
/** 'd#\7J>d
* 7TkxvSL X
* @author vM7v f6
*/ Y#&0x_Z
public class CountControl{ U`8|9v
private static long lastExecuteTime=0;//上次更新时间 G4Kmt98I
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 D2</^]3Su
/** Creates a new instance of CountThread */ +Y)#yGUn
public CountControl() {} i*CQor6|z
public synchronized void executeUpdate(){ F|l`YtZZd
Connection conn=null; =6L*!JP<
PreparedStatement ps=null; `{U%[$<[W
try{ y[p$/$bgC5
conn = DBUtils.getConnection();
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conn.setAutoCommit(false); #M?F^u[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Ah>gC!F^
for(int i=0;i<CountCache.list.size();i++){ o}MzqKfu
CountBean cb=(CountBean)CountCache.list.getFirst(); Sf&?3a+f
CountCache.list.removeFirst(); jD/7/G*
ps.setInt(1, cb.getCountId()); XDkS
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ps.executeUpdate();⑴ M6]0Y@@>
//ps.addBatch();⑵ 6W;?8Z_1
} bug Fl>
//int [] counts = ps.executeBatch();⑶ L;
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conn.commit(); :%#r.p"6x
}catch(Exception e){ 3XwU6M$5g
e.printStackTrace(); ^'&iYV
} finally{ =r@gJw:B
try{ vZE|Z[M+<
if(ps!=null) { 9G#8%[W
ps.clearParameters(); b>QM~mq3^I
ps.close(); tyuk{*Me:
ps=null; W&e'3gk _
} cRh\USS
}catch(SQLException e){} *:9 >W$0u
DBUtils.closeConnection(conn); H5Ux.]y
} .vN%UNu
} 2K]IlsMO&
public long getLast(){ Y:%m;b$]
return lastExecuteTime; drENkS=,
} |,;twj[?4
public void run(){ b+IOh|
long now = System.currentTimeMillis(); 3zB|!pC6s
if ((now - lastExecuteTime) > executeSep) { jQ_dw\
{0
//System.out.print("lastExecuteTime:"+lastExecuteTime); NTm<6Is`
//System.out.print(" now:"+now+"\n"); N )zPxQ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); U['JFLF
lastExecuteTime=now; |
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executeUpdate(); j?\$G.Y
} gT(th9'+z
else{ d$fvg8^
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "($Lx
} 9jO`gWxV8*
} s]y-pZ
} 4jX@m
//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 &@YFje6Lcm
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类写好了,下面是在JSP中如下调用。 AozmO
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<% \fK47oV
CountBean cb=new CountBean(); |P~O15V*Q
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); K`Bq(z?/
CountCache.add(cb); nTys4R
out.print(CountCache.list.size()+"<br>"); 3s` V)aXP
CountControl c=new CountControl(); .4Qb5I2#
c.run(); EqD^/(,L2
out.print(CountCache.list.size()+"<br>"); j?:`-\w5
%>