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: /N")uuv
76u\#{5
CountBean.java <W^>:!?w
Z}IuR|=
/* l=a<=i
* CountData.java z)R\WFBW
* hD,xJ]zv1
* Created on 2007年1月1日, 下午4:44 -AQ
7Bd
* =`!#V/=
* To change this template, choose Tools | Options and locate the template under A>)W6|m|
* the Source Creation and Management node. Right-click the template and choose Sg(\+j=
* Open. You can then make changes to the template in the Source Editor. Smd83W&
*/ fJ%A_N}
mAe)Hy %
package com.tot.count; yATXN>]l
(%fSJCBl[P
/** ;9)=~)
* ?9~|K/ `l
* @author S@ItgG?X
*/ Pb7-pu5X
public class CountBean { dAaxbP|
private String countType; JycC\s+%E
int countId; g{hbq[>X]
/** Creates a new instance of CountData */ FX~pjM
public CountBean() {} o<g1;
public void setCountType(String countTypes){ `Tr !Gj_
this.countType=countTypes; "Fxw"I
<
} 2p*L~! iM
public void setCountId(int countIds){ NH,4>mV$!
this.countId=countIds; j^Ln\N]^
} LEAU3doK;
public String getCountType(){ C1-Jj_XQ.
return countType; f=>iiv
} q=k[]vD
public int getCountId(){ &qm:36Y7Xg
return countId; D)eRk0iC
} py\/m]
} NDG?Xs [2
hNF, sA
CountCache.java D Z=OZ.v
)2bbG4:N
/* )u307Lg
* CountCache.java .b<wNUzP
* :]`JcJ
* Created on 2007年1月1日, 下午5:01 }vW3<|z
* NOtwgZ-
* To change this template, choose Tools | Options and locate the template under Bs<LJzS{V
* the Source Creation and Management node. Right-click the template and choose @SAJ*hfb0
* Open. You can then make changes to the template in the Source Editor. deutY.7g
*/ ;{"uG>#R
.U,>Qn4/
package com.tot.count; ZIaFvm&q7Z
import java.util.*; u6/;=]0
/** 1<wolTf
* w6[$vib'
* @author SXmh@a"*\
*/ wM#q [m;
public class CountCache { 62>/0_m5
public static LinkedList list=new LinkedList(); #s-li b
/** Creates a new instance of CountCache */ `Ro>?H
public CountCache() {} 2Zi&=Zj"
public static void add(CountBean cb){ w%f51Ex
if(cb!=null){ }-paGM@'Nd
list.add(cb); s *<T5Z
} cP8@'l@!
} Jry643K>:;
} $I90KQB\_
Xd9<`gu
CountControl.java |1Ko5z
Q37zBC0
/* }/Y)^
* CountThread.java A;Uw
b
* QK`2^
* Created on 2007年1月1日, 下午4:57 OY(znVHU
* g?!;04
* To change this template, choose Tools | Options and locate the template under x:IY6 l
* the Source Creation and Management node. Right-click the template and choose \EEU G^T
* Open. You can then make changes to the template in the Source Editor. w7h=vy n?
*/ )1]LoEdm`
&bS!>_9
package com.tot.count; pXHeUBY.
import tot.db.DBUtils; & A @!g
import java.sql.*; \(xQ'AQ-
/** .@]M'S^1
* n!y}p q6
* @author QjwCY=PK!
*/ DX#F]8bWl
public class CountControl{ 'P~6_BW
private static long lastExecuteTime=0;//上次更新时间 >eaK@u-'0
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 GE.@*W
/** Creates a new instance of CountThread */ _k.gVm
public CountControl() {} Zu %oIk
public synchronized void executeUpdate(){ p=J9N-EM
Connection conn=null; b1qli5
PreparedStatement ps=null; 64qQ:D7C
try{ yj{:%Km:`
conn = DBUtils.getConnection(); _i{4 4zE
conn.setAutoCommit(false);
T89VSB~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); -2Azpeh
for(int i=0;i<CountCache.list.size();i++){ .:#6dG\0z
CountBean cb=(CountBean)CountCache.list.getFirst(); {:9P4<%H
CountCache.list.removeFirst(); XG}pp`{o
ps.setInt(1, cb.getCountId()); K1>(Fs$
ps.executeUpdate();⑴ *npe]cC
//ps.addBatch();⑵ m=2e1wc
} v;@-bED(Qs
//int [] counts = ps.executeBatch();⑶ 4\yKd8I
conn.commit(); D?"TcA
}catch(Exception e){ #`H^8/!e
e.printStackTrace(); TID0x/j"K5
} finally{ Z;JZ<vEt92
try{ o<-+y\J8K
if(ps!=null) {
wc'K=;c
ps.clearParameters(); VCvqiHn
ps.close(); ;"/ "
ps=null; 'u2Qq"d+
} -m~[z
}catch(SQLException e){} 5&r2