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: L"e8S%UqX
bVO{,P2o
CountBean.java
qp;eBa
G
|033(j
/* Y)lYEhF
* CountData.java DPqk~ KCM
* RzgA;ZC'
* Created on 2007年1月1日, 下午4:44 W:VRLT>w>
* 3g
ep_aC
* To change this template, choose Tools | Options and locate the template under 41dB4Td5t
* the Source Creation and Management node. Right-click the template and choose :QGgtTEV""
* Open. You can then make changes to the template in the Source Editor. vVBu/)
*/ R+}7]tva6C
aGSix}b1P
package com.tot.count; 8=\}#F
J'4Pp<
/** \k&2nYVHf
* kn9ul3c
* @author )jc`_{PQg
*/ - >_rSjnM{
public class CountBean { *ETSx{)8
private String countType; ))ArM-02
int countId; ]l/ PyX
/** Creates a new instance of CountData */ t`%Xxxu
public CountBean() {} 3}hJ`xQ
public void setCountType(String countTypes){ Fp=O:]
this.countType=countTypes; !79eF)
} -9)H[}.
public void setCountId(int countIds){ ;D'6sd"
this.countId=countIds; >x'R7z23
} N5K\h}'%
public String getCountType(){ Z8 eB5!$
return countType; IPHZ~'M
} (+aU ,EQ
public int getCountId(){ P]cC2L@Vbi
return countId; ?5VPV9EX
} '/O >#1
} ^W#161&
yVZLZLm
CountCache.java `|=hl~
w&F.LiX^
/* I)]"`2w2w
* CountCache.java sQ";
t=yC
* Q7#Yw"#G!
* Created on 2007年1月1日, 下午5:01 mZ_643|
* R^*%yjy9
* To change this template, choose Tools | Options and locate the template under g$S|CqRG
* the Source Creation and Management node. Right-click the template and choose sH_B*cr3
* Open. You can then make changes to the template in the Source Editor. z}.Q~4 f0D
*/ .s-V:k5
W!jg
package com.tot.count; lf2Q
import java.util.*; <ddXvUCX
/** ~S\y)l\wZ
* y).dw(
* @author ag02=}Q'r
*/ M1HGXdN* B
public class CountCache { #EG$HX]
public static LinkedList list=new LinkedList(); a*2JLK
/** Creates a new instance of CountCache */ ka=EOiX.
public CountCache() {} 9@3cz_[J
public static void add(CountBean cb){ to,\sc
if(cb!=null){ 0^('hS&
list.add(cb); 9Ib#A
} `En>o~ L;
} y?Cq{(
} 2r^G;,{
v{r,Wy3
CountControl.java [ikW3 '99,
yt+d
f0l
/* 3q-Xj:FP
* CountThread.java BG/Q7s-?K
* SPu+t3
* Created on 2007年1月1日, 下午4:57 )i/x%^ca$
* P1G;JK
* To change this template, choose Tools | Options and locate the template under W!Fu7a
* the Source Creation and Management node. Right-click the template and choose 2H,n"-9+
* Open. You can then make changes to the template in the Source Editor. !-AK@`i.
*/ *e,GXU@
Gr&YzbSX
package com.tot.count; bDtb"V8e
import tot.db.DBUtils; %LjhK,'h
import java.sql.*; .dPy<6E
/** XlJA}^e
* @V =HY
* @author 5c
($~EFr
*/ X+KQ%Efo
public class CountControl{ K#;EjR4H
private static long lastExecuteTime=0;//上次更新时间 AGGNJ4m
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Xn6'*u>+;[
/** Creates a new instance of CountThread */ PN"SBsc*j-
public CountControl() {} zBjbH=
public synchronized void executeUpdate(){ |V-)3#c
Connection conn=null; H: rrY
PreparedStatement ps=null; ;&9wG`
try{ bIy:~z5
conn = DBUtils.getConnection(); _z6 " C8W
conn.setAutoCommit(false); *f-8egt-
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); k#"}oI{<
6
for(int i=0;i<CountCache.list.size();i++){ :{=2ih-}
CountBean cb=(CountBean)CountCache.list.getFirst(); W [B;;"ro
CountCache.list.removeFirst(); R>B4v+b
ps.setInt(1, cb.getCountId()); K<E|29t^k
ps.executeUpdate();⑴ *pSD[E>SU
//ps.addBatch();⑵ AQgagE^
} z8JdA%YBM
//int [] counts = ps.executeBatch();⑶ Nhrh>x[wJ
conn.commit(); hZtJ LY
}catch(Exception e){ 1X-fiQJe
e.printStackTrace(); G[lNgVbU@
} finally{ C^ 1;r9
try{ dQ-:]T (
if(ps!=null) { |Ye%HpTTv
ps.clearParameters(); ,M0#?j>
ps.close(); x.%x|6G*
ps=null; +Z/aB*aVa^
} iM_Zn!|@\
}catch(SQLException e){} :O9i:Xq[QW
DBUtils.closeConnection(conn); mvXIh";
} ' Ivr =-
} Yq0j w&v
public long getLast(){ $.KDnl^
return lastExecuteTime; 4fL/,j/^
} n-x%<j(Xf
public void run(){ 7-j=he/
long now = System.currentTimeMillis(); O m5+j:YM
if ((now - lastExecuteTime) > executeSep) { #,;X2% c
//System.out.print("lastExecuteTime:"+lastExecuteTime); z;1qYW[-A
//System.out.print(" now:"+now+"\n"); 8)V6yKGO
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); d)'J:
lastExecuteTime=now; `KHP?lX
executeUpdate(); &XZS}n
} EF8'ycJk+
else{ f0ME$:2
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); VQ/Jz5^
} `kM:5f+>W
} zrE Dld9
} LgJUMR8vUO
//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 %y[
t+)!E
^nN@@\-5
类写好了,下面是在JSP中如下调用。 56!/E5qgW
'eg;)e:`b+
<% w;]~2$
CountBean cb=new CountBean(); 2>'/!/+R
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); p -wEPC0
CountCache.add(cb); BkJNu_{m?
out.print(CountCache.list.size()+"<br>"); 0Q5fX}
CountControl c=new CountControl(); SwdUElEp
c.run(); Av,E|C
out.print(CountCache.list.size()+"<br>"); XHYVcwmDz-
%>