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: NO2(vE
Lc|{aN
CountBean.java P6.!3%y
T cJ$[
/* &qKigkLd
* CountData.java P\AqpQv
* t+O e)Ns
* Created on 2007年1月1日, 下午4:44 ,:UX<6l
R
* q_sEw~~@!
* To change this template, choose Tools | Options and locate the template under i $C-)d]
* the Source Creation and Management node. Right-click the template and choose lI6W$V\,
* Open. You can then make changes to the template in the Source Editor. &n>7Ir
*/ L=]p_2+
rEM#D]k
package com.tot.count; at|
\FOKj
H:Y&OZ
/** [1SMg$@<
* |cgui
* @author oQ\&}@(V
*/ G>K@AW#
public class CountBean { )c+k_;t'+
private String countType; DW>ES/B8$(
int countId; Z7z]2v3}c
/** Creates a new instance of CountData */ 8I.VJ3Q
public CountBean() {} ,F9nDF@)
public void setCountType(String countTypes){ wXbsS)#/
this.countType=countTypes; ugLlI2 nJ
} Xb,T{.3@
public void setCountId(int countIds){
)M:)y
this.countId=countIds; "}zt`3
}
q=4Bny0
public String getCountType(){ Q|c|2byb
return countType; i%F<AY\O)
} Z!_n_Fk
public int getCountId(){ VD[pZ2;4
return countId; "VTF}#Uo
}
z)w-N
} :G=FiC
t7*#[x)a
CountCache.java cU8x Upq
<cj{Qk
/* ~=cmM
* CountCache.java S&wzB)#'
* S-c ^eLzQ
* Created on 2007年1月1日, 下午5:01 }`_(<H
* j_GBH8`
* To change this template, choose Tools | Options and locate the template under >;9NtoE
* the Source Creation and Management node. Right-click the template and choose IZrk1fh
* Open. You can then make changes to the template in the Source Editor. T$P-<s
*/ 5JSrrpGr
y
vI<4F
package com.tot.count; "@yyXS
r
import java.util.*; X{Zm9T
/** J'Sm0
* :mZYS4L~
* @author Bm /YgQi
*/ r,;\/^ u*
public class CountCache { ^B]@Lr E^
public static LinkedList list=new LinkedList(); i=rH7k
/** Creates a new instance of CountCache */ .<YcSG
public CountCache() {} 8@eOTzm
public static void add(CountBean cb){ +>tUz D
if(cb!=null){ Fr [7
list.add(cb); ?fK1
} BC7 7<R!E)
} qZ+H5AG2
} !Zjq9{t\"
GBQn_(b9I
CountControl.java Gu;OVLR|
;;#`#v
/* -6C +LbV
* CountThread.java {HrZ4xQnpV
* Apfnx7Fv
* Created on 2007年1月1日, 下午4:57 LW:1/w&pv
* #/70!+J_UF
* To change this template, choose Tools | Options and locate the template under (kw5>c7
* the Source Creation and Management node. Right-click the template and choose #g9ZX16}
* Open. You can then make changes to the template in the Source Editor. |He=LQ}0
*/ "rNL
`P7
]?K.
S6
package com.tot.count; Z^ar.boc
import tot.db.DBUtils; |.U)ll(c
import java.sql.*; Adx`8}N8
/** $/Ov2z
* VW<0Lt3
* @author \#Up|u:
*/ DL8x":;
public class CountControl{ 8Vn4.R[vE
private static long lastExecuteTime=0;//上次更新时间 7o]HQ[ xO
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 )jDJMi_[
/** Creates a new instance of CountThread */ 'jfRt-_-
public CountControl() {} j-b* C2l
public synchronized void executeUpdate(){ &c%Y<1e`%
Connection conn=null; K7(MD1tk
PreparedStatement ps=null; r>t1 _b+nu
try{ ,wj"! o#
conn = DBUtils.getConnection(); C+N k"l9
conn.setAutoCommit(false); Qa4MZj;$K
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Q8nId<\(
for(int i=0;i<CountCache.list.size();i++){ j6YiE~
CountBean cb=(CountBean)CountCache.list.getFirst(); ]?LB?:6
CountCache.list.removeFirst(); |i7a@'0)
ps.setInt(1, cb.getCountId()); iiC!|`k"
ps.executeUpdate();⑴ ))T>jh
//ps.addBatch();⑵ WAPhv-6
} S#l5y%&
//int [] counts = ps.executeBatch();⑶ \'v(Xp6
conn.commit(); Z-X?JA\&
}catch(Exception e){ {?8B,G2r
e.printStackTrace(); {eT.SO
} finally{ I 3$dVls}
try{ MaY682}|y
if(ps!=null) { v"O5u%P
ps.clearParameters(); '7)"
ps.close(); mUP. rb6
ps=null; `V!>J1x
} s8mr''
}catch(SQLException e){} ajH"Jy3A
DBUtils.closeConnection(conn); N#z~
} }
cNW^4F
} ~Y!kB:D5;~
public long getLast(){ +OHGn;C
return lastExecuteTime; U1R4x!ym4
} LIpEQ7;
public void run(){ TnH\O$
long now = System.currentTimeMillis(); Ip
*g'
if ((now - lastExecuteTime) > executeSep) { wdas1
//System.out.print("lastExecuteTime:"+lastExecuteTime); cj$6
//System.out.print(" now:"+now+"\n"); }}{Yw
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 1KE:[YQ1
lastExecuteTime=now; H)(jh
executeUpdate(); Ey`h1Y
} IDFFc&
else{ pPro }@@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); [2c{k
} XNH4vG
|
} kLP0{A
} UQ?%|y*Kc
//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 nv/[I,nw
7/IlL
类写好了,下面是在JSP中如下调用。 3iNkoBCg
$lwz-^1t.
<% f'Mop= .
CountBean cb=new CountBean(); ,_
2x{0w:>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); K\?]$dK5
CountCache.add(cb); DBH#)4do@
out.print(CountCache.list.size()+"<br>"); k;^
:
CountControl c=new CountControl(); uE5X~
c.run(); e":G*2a
out.print(CountCache.list.size()+"<br>"); hpbf&S4
%>