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: !ZP1?l30
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CountBean.java TnET1$@qr*
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/* rN#ydw:9
* CountData.java _DfI78`(
* 5vIuH+0
* Created on 2007年1月1日, 下午4:44 1xK'T_[
* 0@a6r=`el
* To change this template, choose Tools | Options and locate the template under \phG$4(7+
* the Source Creation and Management node. Right-click the template and choose ll;#4~iA
* Open. You can then make changes to the template in the Source Editor. &8t?OpB =h
*/ o:C:obiQbu
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package com.tot.count; =DTn9}u
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/** SxXh
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* F=
* @author Q6?+# }
*/ g#FqjE|mx
public class CountBean { g-xbb&]
private String countType; ;@K,>$ur-
int countId; G[u_Uu=>
/** Creates a new instance of CountData */ /1++ 8=
public CountBean() {} X?$Eb
public void setCountType(String countTypes){ EVmQ"PKL'
this.countType=countTypes; %z!
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} K/oPfD]
public void setCountId(int countIds){ 'T[=Uuj"
this.countId=countIds; :j$K.3n
} [ANit0-~
public String getCountType(){ #V-qS/ q"
return countType; 9,5v %HZ
} ri~d Wx
public int getCountId(){ wbI(o4rXE
return countId; &:L8; m
} P,AS`=z
} 9\TvX!)h
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CountCache.java `g%]z@'+?
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/* rBs7,h
* CountCache.java D+rDgrv
* GSV,
* Created on 2007年1月1日, 下午5:01 )Y~q6D K
* y<PPO6u7
* To change this template, choose Tools | Options and locate the template under d T/*O8
* the Source Creation and Management node. Right-click the template and choose "n
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* Open. You can then make changes to the template in the Source Editor. G/(oQA
*/ fT._Os?i
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package com.tot.count; &dvJg
import java.util.*; `{I,!to
/**
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* 9}X3Q!iFb
* @author mL+}Ka
*/ Ndi'b_Sh\
public class CountCache { uW;Uq=UN
public static LinkedList list=new LinkedList(); =B1t?("
/** Creates a new instance of CountCache */ h0n0Dc{4
public CountCache() {} k_V1x0sZ
public static void add(CountBean cb){ wd*T"V3
if(cb!=null){ F-k1yZ?^
list.add(cb); MS^,h>KI
} u!g=>zEu
} /(n)I
} UE7P =B
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CountControl.java O~d!*A
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/* oD{V_/pdx
* CountThread.java A#1aO
* $';'MoS
* Created on 2007年1月1日, 下午4:57 S,AZrgh,"X
* $$ _ uQf
* To change this template, choose Tools | Options and locate the template under ^1,]?F^
* the Source Creation and Management node. Right-click the template and choose \+GXUnkj
* Open. You can then make changes to the template in the Source Editor. !dhZs?/UI
*/ 9 K$F.{cx
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package com.tot.count; pzU">)
import tot.db.DBUtils; .j88=t0
import java.sql.*; a}E8ADyC
/** HT?`PG
* ?RWd"JTGue
* @author uNXh"?
*/ +6<MK;
public class CountControl{ LDV{#5J
private static long lastExecuteTime=0;//上次更新时间 \07Vh6cj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 1b3Lan_2
/** Creates a new instance of CountThread */ +Q-~~v7,
public CountControl() {} (~Zg\(5#
public synchronized void executeUpdate(){ K1:F{*
Connection conn=null; Cy6[p
PreparedStatement ps=null; 6El%T]^
try{ AaTtYd
conn = DBUtils.getConnection(); O-T/H-J`
conn.setAutoCommit(false); n^&QOII@>
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); R~RY:[5?w
for(int i=0;i<CountCache.list.size();i++){ *kyy''r
CountBean cb=(CountBean)CountCache.list.getFirst(); (-dJ0!
CountCache.list.removeFirst(); qwFn(pK[
ps.setInt(1, cb.getCountId()); m$LZ3=v%8
ps.executeUpdate();⑴ fil6w</L
//ps.addBatch();⑵ 73}k[e7e
} /Z2*>7HM8[
//int [] counts = ps.executeBatch();⑶ w5n>hz_5
conn.commit(); nj7Ri=lyS
}catch(Exception e){ P#ru-0DD
e.printStackTrace(); L6 _Sc-sU
} finally{ #i2q}/w5`C
try{ :L`z~/6
if(ps!=null) { 2~J|x+
ps.clearParameters(); :+Dn]:\
ps.close(); KAsS= `
ps=null; 3&' STPpW
} GUN<ZOYb=
}catch(SQLException e){} *"zE,Bp"
DBUtils.closeConnection(conn); H50nR$$<*Y
} +Z;0"'K'e
} +'#d*r91@
public long getLast(){ STOE=TC>
return lastExecuteTime; Q ^ 39Wk@
} 3"L$*toRA
public void run(){ Be]o2N;J
long now = System.currentTimeMillis(); '.kbXw0}
if ((now - lastExecuteTime) > executeSep) { *;gi52tM
//System.out.print("lastExecuteTime:"+lastExecuteTime); R:ar85F
//System.out.print(" now:"+now+"\n"); 7H>dv'
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); R2J3R5S=[
lastExecuteTime=now; $(CHwG-
executeUpdate(); |g;XC^!%=o
} sJM}p5V
else{ IBF>4qm"
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); UT{Nly8u
} pwZ &2&|
} `HJw wKd
} W\KZFrV@
//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
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类写好了,下面是在JSP中如下调用。 =)I{KT:y
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<% +M.|D,wg2
CountBean cb=new CountBean(); rW6w1
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (Q&z1XK3
CountCache.add(cb); /:USpuu
out.print(CountCache.list.size()+"<br>"); [FCNW0NV
CountControl c=new CountControl(); Bf*
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c.run(); A23 Z)`
out.print(CountCache.list.size()+"<br>"); )7`~U"r
%>