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: Nl*i5 io
\##`pa(8
CountBean.java HXks_ix )
R]QpMj%o
/* C5n?0I9
* CountData.java 5I,$EGG
* Ze
?
g
* Created on 2007年1月1日, 下午4:44 0ar=cuDm
* |F!F{d^p
* To change this template, choose Tools | Options and locate the template under E
_iO@
* the Source Creation and Management node. Right-click the template and choose mU G
%LM
* Open. You can then make changes to the template in the Source Editor. 8QF`,oXQO
*/ gb 4pN
uD)-V;}P@;
package com.tot.count; a$}mWPp+f
bPd-D-R
/** -7`-wu
* Sz0+<F#5
* @author #WufZ18#
*/ '6zd;l9Z
public class CountBean { 2u:4$x8
private String countType; -<W2PY<
int countId; m0( E kK
/** Creates a new instance of CountData */ #Lka+l;L7
public CountBean() {} i'tp1CI
public void setCountType(String countTypes){ SRz&Nb
this.countType=countTypes; TzM=LvA
} 2QayM?k8
public void setCountId(int countIds){ e.;M.8N#SQ
this.countId=countIds; )U(u>SV(\
} ^7u#30,}3~
public String getCountType(){ (5`T+pAsV
return countType; N z~"vi(t
} AcC8)xRpk4
public int getCountId(){ O&$0&dhc
return countId; #`/QOTnm2c
} `Q%NSU?
} |E|6=%^
SS8ocGX
CountCache.java 3"rkko?A
Lk.h.ST
/* 7BFN|S_l
* CountCache.java agsISu(
* cZ<
\
* Created on 2007年1月1日, 下午5:01 B\_[R'Pf&
* FH\CK
* To change this template, choose Tools | Options and locate the template under cY{Nos
* the Source Creation and Management node. Right-click the template and choose DO^y;y>
* Open. You can then make changes to the template in the Source Editor. >q(6,Mmb
*/ xm^95}80yh
h%1Y6$
package com.tot.count;
+ld;k/
import java.util.*; Hed$ytMaGz
/** *not.2+
* V}9;eJRvw
* @author s4t0f_vj`
*/ E`AYee%l
public class CountCache { 3N<&u
public static LinkedList list=new LinkedList(); }kPVtSQ
/** Creates a new instance of CountCache */ ;CmOsA,1
public CountCache() {} !N~*EI$
public static void add(CountBean cb){ nem@sB;v#
if(cb!=null){ L[C*@
uK
list.add(cb); gq 4 . d
} DuNcX$%%
} r95zP]T
} )Au&kd-W@(
Z .Pi0c+
CountControl.java }gCHQ;U7`
POGw`:)A
/* M#M?1(O/NE
* CountThread.java |I1+"Mp
* 6tdI6
* Created on 2007年1月1日, 下午4:57 $Jf9;.
* r/AHJU3&eY
* To change this template, choose Tools | Options and locate the template under }ND'0*#
* the Source Creation and Management node. Right-click the template and choose ")M;+<c"l
* Open. You can then make changes to the template in the Source Editor. ;[Tyt[
*/ \ X$)vK
-P#nT 2
package com.tot.count; ;.s:X
import tot.db.DBUtils; t)I0lnbs
import java.sql.*; "DjU:*'
/** =Ahw%`/&}]
* v*r9j8
* @author grbTcLSF
*/ B>|5xpZM12
public class CountControl{ <]Y[XI(kr
private static long lastExecuteTime=0;//上次更新时间 z5EVG
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [hU=mS8=^
/** Creates a new instance of CountThread */ k18$JyaG
public CountControl() {} 3*WS"bt
public synchronized void executeUpdate(){ F]5\YYXO
Connection conn=null; I:t^S.,
PreparedStatement ps=null; D[~}uZ4\
try{ ;$;rD0i|
conn = DBUtils.getConnection(); @HEPc95
conn.setAutoCommit(false); ou6j*eSN
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [g|Hj)(
for(int i=0;i<CountCache.list.size();i++){ v@_in(dk
CountBean cb=(CountBean)CountCache.list.getFirst(); h7?.2Q&S
CountCache.list.removeFirst(); H8i+'5x,?
ps.setInt(1, cb.getCountId()); AZwa4n}"
ps.executeUpdate();⑴ oT->^4WY
//ps.addBatch();⑵ Wc;+2Hl[@
} Cef7+fa
//int [] counts = ps.executeBatch();⑶ $l"MXxx5I
conn.commit(); vlQ0gsXK
}catch(Exception e){ ^<;w+%[MT
e.printStackTrace(); Wk[)+\WQ?
} finally{ P<L&c_u
try{ k7Oy5$##
if(ps!=null) { Jpx'W
ps.clearParameters(); f)^t')
ps.close(); "Ot{^_e
ps=null; MPvWCPB
} fuyl/bx}
}catch(SQLException e){} T.@sq
DBUtils.closeConnection(conn); qLRE}$P
} |nm2Uy/0
} $ !5f"<FCB
public long getLast(){ K:w]>a
return lastExecuteTime; (1 yGg==W.
} %#9P?COs&W
public void run(){ .,mM%w,^O
long now = System.currentTimeMillis(); ^zeL+(@ r/
if ((now - lastExecuteTime) > executeSep) { 4Hd Si
//System.out.print("lastExecuteTime:"+lastExecuteTime); ][t6VA
//System.out.print(" now:"+now+"\n"); owMmCR
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); oD,C<[(p
lastExecuteTime=now;
UTX](:TC
executeUpdate(); wlVvxX3%
} BWEv1' v
else{ sVoR?peQ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :;TYL[
} ]xrD<
} CB({Rn
} %uuH^ A
//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 ?9S+Cj`
`[@VxGy_
类写好了,下面是在JSP中如下调用。 yFO)<GLk
+2y&B,L_Wh
<% [<Jp#&u6sb
CountBean cb=new CountBean(); Nt,~b^9
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {F!v+W>
CountCache.add(cb); J)huy\>,
out.print(CountCache.list.size()+"<br>"); qUg9$oh{LI
CountControl c=new CountControl(); v= 8VvT8
c.run(); 6ZEdihBei
out.print(CountCache.list.size()+"<br>"); 8m7;x/0ld
%>