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: hT6:7_UD
k*|dX.C:
CountBean.java gd<8RVA
oTZ?x}Z1
/* "?,3O2t
* CountData.java FD(zj ^*
* RAKQ+Y"nl
* Created on 2007年1月1日, 下午4:44 ANSv ZqKh
* 9[DQ[bL
* To change this template, choose Tools | Options and locate the template under FtN1ZZ"<*
* the Source Creation and Management node. Right-click the template and choose []Cvma1\
* Open. You can then make changes to the template in the Source Editor. 6h>8^l
*/ \Ekez~k{`
UCYhaD@sP
package com.tot.count; z.16%@R
H%7V)"
/** `XYT:'
* RBx`<iBe
* @author R#~}ZUk2
*/ G B!3`
A%&
public class CountBean { Gb61X6
private String countType; &Pxt6M\d
int countId; 'R*gSqx~
/** Creates a new instance of CountData */ /Nq!^=
public CountBean() {} T(+F6d=1
public void setCountType(String countTypes){ V5rnI\:7
this.countType=countTypes; ^7q=E@[e
} $gDp-7
public void setCountId(int countIds){ n ! qm
this.countId=countIds; $N;!. 5lX3
} &n<jpMB
public String getCountType(){ |Ix6D
return countType; N&NOh|YS
} V2es.I
public int getCountId(){ :{4G=UbAI
return countId; G_5sF|(mq
} OxElvbM#
} vVyO}Q`
q" wi.&|
CountCache.java [2w3c4K
y- k?_$M
/* el!Bi>b9c!
* CountCache.java w|WZEu:0|
* ^a; V-US
* Created on 2007年1月1日, 下午5:01 V$
38
* *wt yyP@
* To change this template, choose Tools | Options and locate the template under /iif@5lw{
* the Source Creation and Management node. Right-click the template and choose +Smv<^bW
* Open. You can then make changes to the template in the Source Editor. |}Mkn4
*/ > 0 !J]gK
UEo,:zeN[
package com.tot.count; }SitT\%
import java.util.*; dQM# -t4*
/** js`zQx'
* 'G(N,vu[@
* @author oE#HI2X
*/ #BS]wj2#
public class CountCache { z+" :,#
public static LinkedList list=new LinkedList(); SUD]Wl7G`r
/** Creates a new instance of CountCache */ =)M 8>>l
public CountCache() {} -Kg@Sj/U}R
public static void add(CountBean cb){ %W"\
if(cb!=null){ PkDL\Nqe
list.add(cb); gZM{]GQ
} L:Wy- Z
} ! qrF=a
} 4NR,"l)
dMGu9k~u
CountControl.java 3\=8tg p
ZfT%EPoZ:
/* -Qnnzp$]
* CountThread.java vlIdi@V
* ^'EEry
* Created on 2007年1月1日, 下午4:57 QN_5q5
* 8g>jz
8
* To change this template, choose Tools | Options and locate the template under 0O-p(L=
* the Source Creation and Management node. Right-click the template and choose 9Z*` {
* Open. You can then make changes to the template in the Source Editor. WY 2b
*/ 6./&l9{h+
w** .8]A"N
package com.tot.count; >qtB27jV
import tot.db.DBUtils; FGwz5@|E
import java.sql.*; DP^{T/G
/** )\mklM9Z
* 5mSXf"R^
* @author wT*N{).
*/ mf}?z21vD
public class CountControl{ 3 tXtt@Yy
private static long lastExecuteTime=0;//上次更新时间 O.rk!&N
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 v@>hjie
/** Creates a new instance of CountThread */ +Yi=Wo/
public CountControl() {} oeIB1DaI
public synchronized void executeUpdate(){ vJ"@#$.
Connection conn=null; 9q* sR1
PreparedStatement ps=null; asQ" |]m
try{ w-/bLg[L?$
conn = DBUtils.getConnection(); S\0"G*
conn.setAutoCommit(false); :\80*[=;Z
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); #S<>+,Lk
for(int i=0;i<CountCache.list.size();i++){ }GkEv}~t
CountBean cb=(CountBean)CountCache.list.getFirst(); nWXI*%m5
CountCache.list.removeFirst(); BOwkC;Q[
ps.setInt(1, cb.getCountId()); ~Ag!wj
ps.executeUpdate();⑴ ,?&hqM\
//ps.addBatch();⑵ (3]7[h7
} CKh-+8j
//int [] counts = ps.executeBatch();⑶ 7%7_i%6wP
conn.commit(); $6y1';A
}catch(Exception e){ G Q8I |E
e.printStackTrace(); <R3S{ty
} finally{ EXJ>Z
try{ o{-PT'
if(ps!=null) { Nq*\{rb
ps.clearParameters(); 0w+hf3K+:
ps.close(); bO2$0!=I
ps=null; k9^P#l@p
} [j93Mp
}catch(SQLException e){} 0A 4(RLGg
DBUtils.closeConnection(conn); U +mx@C_
} ' J-(v
} _|A)ueY
public long getLast(){ Z]SCIU @+
return lastExecuteTime; Nm,vE7M
} mnil1*-c0
public void run(){ W;KHLHp-
long now = System.currentTimeMillis(); $wN'mY
if ((now - lastExecuteTime) > executeSep) { d+&V^qLJ
//System.out.print("lastExecuteTime:"+lastExecuteTime); m k -"
U7;
//System.out.print(" now:"+now+"\n"); "sg$[)I3n
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); i}wu+<Mk
lastExecuteTime=now; hJd#Gc~*M
executeUpdate(); :nwcO3~`
} PI{sO |
else{ }1_gemlf
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); JpuW
!I
} >Y2Rr9
} <CA
lJ
} PKjA@+
//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 iicrRGp3
ie$=3nZJ}
类写好了,下面是在JSP中如下调用。 ~!:F'}bj
ahV_4;yF
<% (b{
{B$O
CountBean cb=new CountBean(); {.!:T+'Xi\
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); bM-Y4[
CountCache.add(cb); }*R"yp
out.print(CountCache.list.size()+"<br>"); >Mvt;'c
CountControl c=new CountControl(); ^2mXXAQf7^
c.run(); }>Os@]*'^(
out.print(CountCache.list.size()+"<br>"); w:umr#
%>