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: 6yC4rX!a
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CountBean.java ku#WQL
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/* 9vCCE[9
* CountData.java RxVZn""
* j?\z5i""f
* Created on 2007年1月1日, 下午4:44 $KS!vS7
* '*<I<? z;
* To change this template, choose Tools | Options and locate the template under VDiW9]
* the Source Creation and Management node. Right-click the template and choose TK0W=&6#A
* Open. You can then make changes to the template in the Source Editor. a.a
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*/ |3`8$-
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package com.tot.count; ((=T E
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/** /-+hMYe
* Q 87'zf
* @author iV!V!0- @
*/ ?.Ip(g
public class CountBean { SF da?>
private String countType; bGxHzzU}
int countId; ZX'3qW^D
/** Creates a new instance of CountData */ I__a}|T%
public CountBean() {} M(n@ytz
public void setCountType(String countTypes){ N*)O_Ki
this.countType=countTypes; 5kojh _\
} `O`MW} c
public void setCountId(int countIds){ 5=8t<v1Bn
this.countId=countIds; yI^7sf7k
} yq[@Cw
public String getCountType(){ DVDzYR**4
return countType; JEF ;Q
} o'8nQ
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public int getCountId(){ D
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return countId; LjIkZ'HuF
} T`9nY!
} kdaq_O:s
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CountCache.java Z;njSw%:
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/* <j3|Mh_(I
* CountCache.java /U`p|M;
* amQTPNI
* Created on 2007年1月1日, 下午5:01 l=x(
* Ejnk\ 8:
* To change this template, choose Tools | Options and locate the template under C~C`K%7
* the Source Creation and Management node. Right-click the template and choose lQy-&d|=#^
* Open. You can then make changes to the template in the Source Editor. #T@k(Bz{L
*/ ^;tB,7:*V
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package com.tot.count; %jHe_8=o
import java.util.*; cDK)zD
/** Z]x6np
* [ako8
* @author [B +:)i
*/ 7p1B"%
public class CountCache { ^aQ&.q
public static LinkedList list=new LinkedList(); >0uj\5h)I]
/** Creates a new instance of CountCache */ eN\+
public CountCache() {} FZIC|uz
public static void add(CountBean cb){ [HL>Lp&A?
if(cb!=null){ z;ku*IV
list.add(cb); /Gn0|]KI
} @^o7UzS4z
} vVrM[0*c
} :,g]Om^
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CountControl.java \Hf/8!q
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/* Tu5p`p3-j
* CountThread.java ?%Ww3cU+J
* 4nGt*0Er
* Created on 2007年1月1日, 下午4:57 `S.I,<&
* 7upWM~H^
* To change this template, choose Tools | Options and locate the template under |I29m`
* the Source Creation and Management node. Right-click the template and choose gS@<sO$d>
* Open. You can then make changes to the template in the Source Editor. .wyuB;:
*/
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package com.tot.count; p\9}}t7n
import tot.db.DBUtils; &U7h9o H
import java.sql.*; yn_.
/** ]!~?j3-k Q
* E@n~ @|10
* @author [HUK
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*/ }`%ks
public class CountControl{ e-[PuJ
private static long lastExecuteTime=0;//上次更新时间 72.Msnn
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ts}OE
/** Creates a new instance of CountThread */ I|qhj*_C
public CountControl() {} (DS"*4ty
public synchronized void executeUpdate(){ VaGQre
Connection conn=null; xI~AZ:m
PreparedStatement ps=null;
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try{ 4*Gv0#dga
conn = DBUtils.getConnection(); I,`;#Q)nx
conn.setAutoCommit(false); ! K_<hNG&
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); &/ED.K
for(int i=0;i<CountCache.list.size();i++){ \7>*ULP
CountBean cb=(CountBean)CountCache.list.getFirst(); } .Z`
CountCache.list.removeFirst(); F|qMo|
ps.setInt(1, cb.getCountId()); 0a^bAEP
ps.executeUpdate();⑴ q=D8 Nz
//ps.addBatch();⑵ 1q3"qYH
} 6vR6=@(`>
//int [] counts = ps.executeBatch();⑶ Xt$P!~Lu
conn.commit(); @"1Z;.S8V
}catch(Exception e){ x[Hx.G}5+
e.printStackTrace(); 0"T/a1S7bl
} finally{ W5= j&&|!
try{ )KVr2y;RF
if(ps!=null) { }+G5i_a
ps.clearParameters(); #ojuSS3
ps.close(); ~cfXEjE6
ps=null; UZrEFpi
} hf0(!C*
}catch(SQLException e){} a$Y{ut0t(
DBUtils.closeConnection(conn); T!B\ixt6
} PREGQ0
} )h&@}#A09
public long getLast(){ PnInsf%;
return lastExecuteTime; (a8iCci:
} m"'LT0nur
public void run(){ /|i*'6*
long now = System.currentTimeMillis(); W;2J~V!c
if ((now - lastExecuteTime) > executeSep) { nKS*y*
//System.out.print("lastExecuteTime:"+lastExecuteTime); !rAH@y.l
//System.out.print(" now:"+now+"\n"); U5H%wA['m
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); LjE3|+pJ
lastExecuteTime=now; 'N+;{8C-{
executeUpdate(); !#W>x49}
} \G>C{v;
else{ 8h@L_*Kr
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); wv."
} { +w.Z,D"
} f<VK\%M
} }Oc+EV-Z
//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 dVj2x-R)
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类写好了,下面是在JSP中如下调用。 zEtsMU
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<% OZe&p
CountBean cb=new CountBean(); Xm>zT'B_tJ
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); wn! =G~nB
CountCache.add(cb); xatq
out.print(CountCache.list.size()+"<br>"); g=Xy{Vm
CountControl c=new CountControl(); %sOY:>
c.run(); L@s6u+uu
out.print(CountCache.list.size()+"<br>"); P658
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%>