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: (U _wp's
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CountBean.java `2,a(Sk#
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/* 5=Suj*s{D#
* CountData.java `On3/gU|
* zWb-pF|
* Created on 2007年1月1日, 下午4:44 UP]1(S?
* nGns}\!7'
* To change this template, choose Tools | Options and locate the template under Hv8H.^D>
* the Source Creation and Management node. Right-click the template and choose :6zC4Sr^
* Open. You can then make changes to the template in the Source Editor. mbGcDG[HQ
*/ 8<{;=m8cQ
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package com.tot.count; 2uEhOi0I
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/** Ch7Egzl7?
* vlu$!4I
* @author DRp&IP<
*/ jWSb5#Pw
public class CountBean { MUB37
private String countType; JN|VPvjE
int countId; NHAH#7]M&1
/** Creates a new instance of CountData */ S~> 5INud
public CountBean() {} #52NsVaT@
public void setCountType(String countTypes){ IkU|W3Vo
this.countType=countTypes; vf N#NY6
} Wy.";/C
public void setCountId(int countIds){ [Y$V\h=V
this.countId=countIds; ^SAq^3^P!
} -%H%m`wD
public String getCountType(){ !*_K.1'
return countType; wFb@1ae\
} 5 < GDW=
public int getCountId(){ RG&6FRoq
return countId; ;NP[_2|-,
} :!']p2B
} &XtRLtgS
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CountCache.java g|4w8ry
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/* 5VKcV&D
* CountCache.java 9~~UM<66W
* )88nMH-
* Created on 2007年1月1日, 下午5:01 ul=7>";=|
* u7#z^r
* To change this template, choose Tools | Options and locate the template under OXCQfT@\
* the Source Creation and Management node. Right-click the template and choose G0/>8_Q>Nr
* Open. You can then make changes to the template in the Source Editor. 'hF@><sqk
*/ ${>DhfF
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package com.tot.count; qtY
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import java.util.*; 0+j}};
/** K}K)`bifw
* V7@
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* @author > 0T
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*/ Onw24&
public class CountCache { Q6x%
public static LinkedList list=new LinkedList(); ,E9d\+j
/** Creates a new instance of CountCache */ t!~S9c
public CountCache() {} o|rzN\WJn
public static void add(CountBean cb){ :1MMa6
if(cb!=null){ %E.S[cf%8&
list.add(cb); gl
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} HTR1)b
} xqv[?
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} |7c`(.
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CountControl.java j3 P$@<
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/* m8AAp1=
* CountThread.java L;yEz[#xaT
* }N]!0Ka
* Created on 2007年1月1日, 下午4:57 s#P:6]Ar
* 8W,*eke?
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose |^iA6)Q
* Open. You can then make changes to the template in the Source Editor. iC*U $+JG
*/ )E-E0Hl>7
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package com.tot.count; n_P(k-^U*
import tot.db.DBUtils; zt?H~0$LB
import java.sql.*; yoU2AMH2D^
/** [pR)@$"k'
* t:T?7-XIE
* @author o(Kcs-W2
*/ 4By]vd<;=
public class CountControl{ GX5W^//}
private static long lastExecuteTime=0;//上次更新时间 >BJ}U_ck
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 tW(+xu36
/** Creates a new instance of CountThread */ m^A]+G#/
public CountControl() {} 85hQk+Bu4
public synchronized void executeUpdate(){ jsdBd2Gdc
Connection conn=null; :o$@F-$k
PreparedStatement ps=null; -l JYr/MSL
try{
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conn = DBUtils.getConnection(); c'rd $
conn.setAutoCommit(false); B1+ZFQo
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); b0YNac.l
for(int i=0;i<CountCache.list.size();i++){ Yrsp%<qj
CountBean cb=(CountBean)CountCache.list.getFirst(); $?$9y^\
CountCache.list.removeFirst(); 4=s9A
ps.setInt(1, cb.getCountId()); Ut_mrb+W
ps.executeUpdate();⑴ S.hC$0vrj
//ps.addBatch();⑵ 9GPb$gtx
} n;qz^HXEJ
//int [] counts = ps.executeBatch();⑶ Pw
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conn.commit(); |[ocyUsxX
}catch(Exception e){ {XHk6w
*-
e.printStackTrace(); A$<>JVv
} finally{ ~bGnq,
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try{ {_7Hz,2U
if(ps!=null) { 6l[G1KkV
ps.clearParameters(); +f|6AeE
ps.close(); k(v"B@0
ps=null; %A2`&:ip
} eJ:Yj
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}catch(SQLException e){} y;:]F|%<
DBUtils.closeConnection(conn); E*^9|Y[
} m#MlH=-
} sX5sL
public long getLast(){ o\60n
return lastExecuteTime; ]738Z/)^
} !
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public void run(){ /n8psj
long now = System.currentTimeMillis(); gLx/w\l6
if ((now - lastExecuteTime) > executeSep) { _NT[
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//System.out.print("lastExecuteTime:"+lastExecuteTime); K%PxA#P}
//System.out.print(" now:"+now+"\n"); Uz
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); EZ{/]gCK
lastExecuteTime=now; \n;g2/VjO
executeUpdate(); 0T0/fg(o
} &SrGh$:X
else{ FT4l$g7"
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); R=Ymo.zs6
} 8sWr\&!
} wibwyzo
} e2bLkb3c
//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 [9HYO
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类写好了,下面是在JSP中如下调用。 &D)2KD"N
-nGwuEngP
<% k#?|yP:
CountBean cb=new CountBean(); #Z!#;%S
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); %Gu][_.L
CountCache.add(cb); jiq2 x\\!
out.print(CountCache.list.size()+"<br>"); }+_9"YQ:
CountControl c=new CountControl(); %i3{TL
c.run(); ]<q'U> N
out.print(CountCache.list.size()+"<br>"); o~k;D{Snr
%>