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: f=:.BR{
C7"HQQ
CountBean.java ;Rnhe_A.
Jbw!:x
[
/* !$xu(D.
* CountData.java R 1zC.m
* %efGt6&
* Created on 2007年1月1日, 下午4:44 V'wi ^gq
* 9C}qVoNu
* To change this template, choose Tools | Options and locate the template under v <h;Di@
* the Source Creation and Management node. Right-click the template and choose 3VO:+mT
* Open. You can then make changes to the template in the Source Editor. AlX3Wv}
*/ L]-w;ll-
2<6j1D^jM
package com.tot.count; sBW3{uK
rG6\ynBX%
/** @EZ>f5IO+
* 4F#%f#"
* @author __\P`S_
*/ ^#SBpLw
public class CountBean { Wc4vCVw
private String countType; W<'<'z5
int countId; &YX6"S_B
/** Creates a new instance of CountData */ KTmaglgp
public CountBean() {} 19I:%$U3
public void setCountType(String countTypes){ /~hbOs/
L
this.countType=countTypes; *\q8BZ
} mK\aI
public void setCountId(int countIds){ SMO*({/
this.countId=countIds; "iek,Y}j7
} n2'|.y}Um:
public String getCountType(){ sR79
K1*j
return countType; |5ONFde"0
} {nRUH*(d9
public int getCountId(){ -Bv12ymLG
return countId; In(NF#
} Gpu_=9vzv
} \R Z3Hh
otnV-7)@
CountCache.java chLeq
\(u@F<s-
/* ~e^)q>Lb7(
* CountCache.java 3+ asP&n
* 2oB?Dn
* Created on 2007年1月1日, 下午5:01 aL)$b
* 3^ ~Zj95M
* To change this template, choose Tools | Options and locate the template under I9/KM4&
* the Source Creation and Management node. Right-click the template and choose x]'H jTqX
* Open. You can then make changes to the template in the Source Editor. ZR
mPP
*/ ?`i|"y#
XGk}e4;_
package com.tot.count; k~|ZO/X@l%
import java.util.*; BhkAQEsWTQ
/** G5umeqYC
* 88YC0!Ni
* @author m)k-uWc$C
*/ 8bGD
public class CountCache { %*p^$5L<
public static LinkedList list=new LinkedList(); kA,4$2_o
/** Creates a new instance of CountCache */ hXnw..0"
public CountCache() {} '\'7yN'
public static void add(CountBean cb){ JU2P%3
if(cb!=null){ B3.X}ys#
list.add(cb);
2%]t3\XW
} *vD/(&pQ1:
} At|ht
} f~iML5lG
APOea
CountControl.java 2D_6
2_I+mQ
/* 7_7xL(F/
* CountThread.java 9Q=>MOB-
* GJ>ypEWo
* Created on 2007年1月1日, 下午4:57 Sy:K:Z|[U
* 4a1BGNI%SW
* To change this template, choose Tools | Options and locate the template under sI4QI\*4
* the Source Creation and Management node. Right-click the template and choose 03] r*\
* Open. You can then make changes to the template in the Source Editor. ~{9x6<g!
*/ 69-$Wn43<
^Jn|*?+l
package com.tot.count; ^`/V i
import tot.db.DBUtils; L#[HnsLp_
import java.sql.*; M$#+W?m&
/** 83B\+]{hD
* @H3|u`6V
* @author ZIDFF
*/ ]y$)%J^T
public class CountControl{ 1RmBtx\<
private static long lastExecuteTime=0;//上次更新时间 ,,XS;X?
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 KqFmFcf|
/** Creates a new instance of CountThread */ Bk@bN~B4
public CountControl() {} "[Yip5
public synchronized void executeUpdate(){ h=:*7>}
Connection conn=null; `Nkx7Z~w:
PreparedStatement ps=null; |WQD=J%~(
try{ D5}DV
conn = DBUtils.getConnection(); twAw01".
conn.setAutoCommit(false); kg zwlKK
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); :m)c[q8
for(int i=0;i<CountCache.list.size();i++){ $4ka +nfU
CountBean cb=(CountBean)CountCache.list.getFirst(); _CHKh*KHML
CountCache.list.removeFirst(); w($XEv;
ps.setInt(1, cb.getCountId());
7l[t9ON
ps.executeUpdate();⑴ Ty)gPh6O
//ps.addBatch();⑵ (
?atGFgu
} rHH#@Zx
//int [] counts = ps.executeBatch();⑶ c>M_?::)0
conn.commit(); R65;oJh
}catch(Exception e){ r7zf+a]
e.printStackTrace(); Vx0MG{vG1
} finally{ 3 t~X:
try{ Fj'\v#h
if(ps!=null) { # Lu4OSM+
ps.clearParameters(); 9?EY.}~
ps.close(); fJ,8g/f8
ps=null; wCqE4i
} c`Lpqs`
}catch(SQLException e){} DK2c]i^|=
DBUtils.closeConnection(conn); :FEd:0TS
} &Z#Vw.7U
} bvt-leA=
public long getLast(){ &