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: |v5
ge3-
PAtv#)h
CountBean.java 9F?-zn;2s
CQ^(/B^c
/* >goHQ30:
* CountData.java 5??}9
* ysl#Rwt/2
* Created on 2007年1月1日, 下午4:44 s S#/JLDx]
* D
.LR-Z
* To change this template, choose Tools | Options and locate the template under /!A"[Tyt
* the Source Creation and Management node. Right-click the template and choose 4[MTEBx
* Open. You can then make changes to the template in the Source Editor. b-#lKWso
*/ D6+3f#k6
4z26a
package com.tot.count; a?8)47)
BHYguS^qz
/** .XiO92d9
* %7w8M{I R3
* @author vw(ecs^C
*/ 0Q?%B6g$m[
public class CountBean { *" C9F/R
private String countType; t u{~:Z(
int countId; ?!/8~'xA6
/** Creates a new instance of CountData */ 3 H5
public CountBean() {} _)!*,\*`{
public void setCountType(String countTypes){ QjG/H0*mP
this.countType=countTypes; N- knhA
} " zD9R4\X.
public void setCountId(int countIds){ 0GeL">v,:=
this.countId=countIds; \AA9
m'BZ
} $C fp1#
public String getCountType(){ w?^[*_Y
return countType; VNIl%9:-l
} %N&W_.F6
public int getCountId(){ ?wCX:?g
return countId; <)T~_s
} _@[W[=|H
} 6
R})KIG
J5HK1
CountCache.java !6RDq`
hfyU}`]
/* !K}W.yv,
* CountCache.java `BG>%#
* vt*
* Created on 2007年1月1日, 下午5:01 ~ss6yQ$
* US"g>WLwJ
* To change this template, choose Tools | Options and locate the template under OY:rcGc`t
* the Source Creation and Management node. Right-click the template and choose BG?>)]6
* Open. You can then make changes to the template in the Source Editor. -l[$+Kw1S
*/ xS5 -m6/
]4c+{
package com.tot.count; .74C~{}$
import java.util.*; xP&7i'ag
/** 0H^*VUyW/
* Q1x&Zm1v
* @author Lw_|o[I}
*/ Wkjp:`(-$r
public class CountCache { .Wy'
public static LinkedList list=new LinkedList(); PuGs%{$(h
/** Creates a new instance of CountCache */ &Mudu/KTr
public CountCache() {} H)gc"aRe;Y
public static void add(CountBean cb){ E?P>s T3B
if(cb!=null){ "G.X=,
V
list.add(cb); 3Wv^{|^
} Cb+$|Kg/"b
} .udLMS/_
} !bYVLFp=\_
Ry]9n.y
CountControl.java QSa#}vCp*
R2-F@_
/* ckY#oRQ1
* CountThread.java {j]cL!Od
* 43M.Hj]
* Created on 2007年1月1日, 下午4:57 bo\Ah/.
* Q*PcO \Y!y
* To change this template, choose Tools | Options and locate the template under w?|qKO
* the Source Creation and Management node. Right-click the template and choose ;
YQB
* Open. You can then make changes to the template in the Source Editor. g@4~,
*/ :?g+\:`/0j
,@?9H ~\
package com.tot.count; rXD:^wUSc
import tot.db.DBUtils; ,h'Q
import java.sql.*; 9wldd*r
/** e"eIQI|N
* :}Yk0*
* @author j<0;JAL
*/ {2P18&=
public class CountControl{ qmFbq<&
private static long lastExecuteTime=0;//上次更新时间 .nrbd#i-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Z.Z;p/4F
/** Creates a new instance of CountThread */ 6LGl]jHf
public CountControl() {} |/n7(!7$[v
public synchronized void executeUpdate(){ %,02i@Fc
Connection conn=null; `:V'E>B
PreparedStatement ps=null; w->Y92q]
try{ ,
ftJw
conn = DBUtils.getConnection(); s=jYQ5nv
conn.setAutoCommit(false); {%9@{Q'T.s
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); vCJa%}
for(int i=0;i<CountCache.list.size();i++){ ny1O- `!1
CountBean cb=(CountBean)CountCache.list.getFirst();
l:UKU !
CountCache.list.removeFirst(); 0{bl^#$f
ps.setInt(1, cb.getCountId()); Er~KX3vF
ps.executeUpdate();⑴ +ynhN\S$/
//ps.addBatch();⑵ wyB]!4yy,
} * BR#^Wt
//int [] counts = ps.executeBatch();⑶ %~Rg`+
conn.commit(); Zf!Q4a"
}catch(Exception e){ ,;w~ VZ4
e.printStackTrace(); Y]0c%Fd
} finally{ sV{\IgH/x
try{ "D_:`@V(
if(ps!=null) { &Y=~j?~Xm
ps.clearParameters(); AmDOv4
ps.close();
-WqhOZ
ps=null; 'ZMh<M[
} j;_
}catch(SQLException e){} a7ZufB/
DBUtils.closeConnection(conn); JXe~
9/!
} ly*v|(S&
} l_:P|
public long getLast(){ b:Zh|-
return lastExecuteTime; c]#}#RJ`\
} bs)wxU`Q*
public void run(){ \l/}` w
long now = System.currentTimeMillis(); *|\bS "
if ((now - lastExecuteTime) > executeSep) { zM&ro,W
//System.out.print("lastExecuteTime:"+lastExecuteTime); T{+a48,;
//System.out.print(" now:"+now+"\n"); `+\$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9Q s5e
lastExecuteTime=now; Bx|W#:3e
executeUpdate(); ,Owk;MV@
} O H2IO
else{ =oL:|$Pj
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); PL$XXj>|:
} 8HBwcXYoHh
} IP#vfM
} TA*}p=?6?!
//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 ]YhQQH1>]
>_yL@^
类写好了,下面是在JSP中如下调用。 0/f|ZH ~!
,(x`zpp _
<% }>BNdm"Er
CountBean cb=new CountBean(); Bj\
x
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ~"`e9Im
CountCache.add(cb); hjg1By(
out.print(CountCache.list.size()+"<br>"); .p e3L7g
CountControl c=new CountControl(); Q34u>VkdQI
c.run(); gF)-Ci
out.print(CountCache.list.size()+"<br>"); `f~bnL
%>