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: S(aZ4{a@
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CountBean.java `]Bxn)b(
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/* Z`3ufXPNlO
* CountData.java 1{_A:<VBl
* \Ep0J $ #o
* Created on 2007年1月1日, 下午4:44 #}^-C&~
* 6mH/ m&
* To change this template, choose Tools | Options and locate the template under 4x%(9_8{-
* the Source Creation and Management node. Right-click the template and choose [#YE^[*qK
* Open. You can then make changes to the template in the Source Editor. H&b3{yOa
*/ )rLMIk
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package com.tot.count; G#Ou[*O'
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/** LflFe@2
* <\zCpkZ'B
* @author D}3XFuZs_
*/ y$hp@m'@C
public class CountBean { midsnG+jnf
private String countType; TO,rxf
int countId; `IINq{Zk
/** Creates a new instance of CountData */ >s3gqSDR
public CountBean() {} fQ+VT|jzx
public void setCountType(String countTypes){ [~D|peM3
this.countType=countTypes; :`)~-`_
} *=Z26
public void setCountId(int countIds){
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this.countId=countIds; ~tB;@e
} g/=K.
public String getCountType(){ t0:AScZY
return countType; 7 1W5.!
} Fyyg`J
public int getCountId(){ HmK*b Z
return countId; %=j3jj[
} C}IbxKl
} n3MWs);5
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CountCache.java mYB`)M*Y
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/* H(0q6~|
* CountCache.java UkCnqNvx
* /\mKY%kyh
* Created on 2007年1月1日, 下午5:01 zT~B6
* o
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* To change this template, choose Tools | Options and locate the template under g=}v>[k E
* the Source Creation and Management node. Right-click the template and choose J` {6l
* Open. You can then make changes to the template in the Source Editor. [=*E+Oc
*/ #n\C
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package com.tot.count; wxLXh6|6%_
import java.util.*; 6`\]derSon
/** y%]8'q$
* a=GM[{og
* @author "%8A:^1
*/ A{o 'z_zC
public class CountCache { uQLlA&I"
public static LinkedList list=new LinkedList(); $N$ FtpB
/** Creates a new instance of CountCache */ 1-I
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public CountCache() {} *5%*|>
public static void add(CountBean cb){ D}Ilyk_uUw
if(cb!=null){ F="z]C;u
list.add(cb); V%HS\<$h
} 'k&?DZ!
} 7dh1W@\
} f<y&\'3
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CountControl.java SN+S6
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/* %>Xr5<$:&
* CountThread.java -U2mfW
* sPNfbCOz
* Created on 2007年1月1日, 下午4:57 (g :p5Rl
* E(<LvMiCa
* To change this template, choose Tools | Options and locate the template under +V v+K(lh$
* the Source Creation and Management node. Right-click the template and choose z*~YLT&
* Open. You can then make changes to the template in the Source Editor. t0PQ~|H<KV
*/ HW=xvA+
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package com.tot.count; D1,O:+[;.
import tot.db.DBUtils; Kn+=lCk
import java.sql.*; ;i#LIHJ
/** \9)[#Ld
* Mj0Cat=
* @author p}]q d4j
*/ >', y
public class CountControl{ ;kaHN;4?
private static long lastExecuteTime=0;//上次更新时间 {7Cx#Ewd
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 >e5zrgV
/** Creates a new instance of CountThread */ o}8{Bh^
public CountControl() {} t\j!K2
public synchronized void executeUpdate(){ d+z[\i
Connection conn=null; urY`^lX~
PreparedStatement ps=null; o%(bQV-T
try{ FN"rZWM
conn = DBUtils.getConnection(); +?-qfp,:0
conn.setAutoCommit(false); w`yx=i#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 6X+}>qy
for(int i=0;i<CountCache.list.size();i++){ 67<CbQZoN3
CountBean cb=(CountBean)CountCache.list.getFirst(); J;~|ph
CountCache.list.removeFirst(); (b/d0HCND
ps.setInt(1, cb.getCountId()); /rF8@l
ps.executeUpdate();⑴ &jts:^N>
//ps.addBatch();⑵ #dJ 2Q_2
} _=`x])mM
//int [] counts = ps.executeBatch();⑶ o0;7b>Tv
conn.commit(); eFQQW`J
}catch(Exception e){ 3_qdJ<,
e.printStackTrace(); 9n}A ^
} finally{ }(i(Ar-
try{ ;?6>mh(`
if(ps!=null) { G_oX5:J*
ps.clearParameters(); :B#EqeI
ps.close(); jOv"<
ps=null; *M!kA65'
} 9\51Z:>
}catch(SQLException e){} ,zgNE*{Y"4
DBUtils.closeConnection(conn); jW5iqU"{*
} `!c,y~r[
} x72G^`Wv
public long getLast(){ 'XfgBJF=
return lastExecuteTime; rnvQ<671W
} S!j^|!
public void run(){ Jirct,k
long now = System.currentTimeMillis(); r=csi
if ((now - lastExecuteTime) > executeSep) { huAyjo
//System.out.print("lastExecuteTime:"+lastExecuteTime); 8$ DwpJ
//System.out.print(" now:"+now+"\n"); \REc8nsLy
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); }K8Lm-.=
lastExecuteTime=now; )1_(>|@oi
executeUpdate(); D9^7m
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} >~&(P_<b
else{ Xu]h$%W
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ="lI i$>O
} [_%,6e+
} G]lvHD
} v' 0!= r
//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 a;&}zcc*
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类写好了,下面是在JSP中如下调用。 px
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<% n#>5?W
CountBean cb=new CountBean(); V Cf|`V~ G
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {&`VGXG
CountCache.add(cb); h2&y<Eg >
out.print(CountCache.list.size()+"<br>"); .Cfp'u%\;
CountControl c=new CountControl(); b]K>vhQV
c.run(); WY.5K
=}
out.print(CountCache.list.size()+"<br>"); thV Tdz
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