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: mSp-
zH0%;
o}
CountBean.java yM}}mypS
$3[IlQ?
/* WS/^WxRY
* CountData.java *p`0dvXG2
* /`Yy(?,
* Created on 2007年1月1日, 下午4:44 5Q#;4
* Kfa7}f_
* To change this template, choose Tools | Options and locate the template under Wb+^Ue
* the Source Creation and Management node. Right-click the template and choose #=V%S
2~
* Open. You can then make changes to the template in the Source Editor. +dX1`%RR[
*/ lM86 *g 'l
K_{f6c<
package com.tot.count; 4v_?i@,L
m2E$[g
/** F l83
Z>
* / *RDy!m
* @author %6+J]U
*/ orVsMT[A
public class CountBean { b'Pq[ )
private String countType; 4.I6%Bq$
int countId; Q&]
}`Rp=
/** Creates a new instance of CountData */ H%t/-'U?
public CountBean() {} O$k;p<?M
public void setCountType(String countTypes){ 7!+kyA\}r^
this.countType=countTypes; nd3=\.(P
} g0v},n
public void setCountId(int countIds){ rlT[tOVAY
this.countId=countIds; XSyCT0f08
} lhw]?\
public String getCountType(){ gh=s#DQsFw
return countType; Z4A
a
} %Koc^
pb)
public int getCountId(){ 4:q<<vCJv
return countId; kMWu%,s4
} bj\v0NKN4
} {_0Efc=7
#H{<nVvg^
CountCache.java JZQkr
] e!CH
<N
/* c9-$td&
* CountCache.java f{xR
s-u]
* ?v-IN
* Created on 2007年1月1日, 下午5:01 7F;"=DarOE
* bN$`&fC0
* To change this template, choose Tools | Options and locate the template under )67_yHW
* the Source Creation and Management node. Right-click the template and choose `au('
xi<
* Open. You can then make changes to the template in the Source Editor. z`qBs
*/ >^LVj[.1
L]hXAShmb
package com.tot.count;
@[u!
import java.util.*; Genk YtS
/** YLmzMD>
* A`v (hBM
* @author P*oKcq1R
*/ j}uFp|df<
public class CountCache { `2c>M\c4U
public static LinkedList list=new LinkedList(); -CfGWO#Gbx
/** Creates a new instance of CountCache */ CB<1]Z
public CountCache() {} ZKzXSI4
public static void add(CountBean cb){ :*gYzk8
if(cb!=null){ !<H[h4g
list.add(cb); !`q*{Ojx
} 4 d4le
} OSk:njyC[
} q$z#+2u
#gq4%;
CountControl.java RBIf6oxdE
2
*IF
/* AN7WMX
* CountThread.java OLJb8kO
* 'c<vj
jIg
* Created on 2007年1月1日, 下午4:57 /%C6e
)7BL
* _+g5;S5
* To change this template, choose Tools | Options and locate the template under bq[j4xH0X
* the Source Creation and Management node. Right-click the template and choose b/Y9fQn
* Open. You can then make changes to the template in the Source Editor. Yr@_X
*/ }dw`[{cm
6NH.!}"G9
package com.tot.count; Eb SH)aR
import tot.db.DBUtils; }c1Vu
import java.sql.*; nkTH#WTfR
/** -NtT@ +AE
* *T"JO|
* @author fN~kdm.
*/ Mnyg:y*=
public class CountControl{ T0s7aw[zm
private static long lastExecuteTime=0;//上次更新时间 %^[45e
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 S>OfUrt
/** Creates a new instance of CountThread */ 0Ge*\Q
public CountControl() {} 8*kZ.-T
B
public synchronized void executeUpdate(){ )QE7$|s
Connection conn=null; v39`ct= e
PreparedStatement ps=null; ?(Q" y\
try{ tt%Zwf
conn = DBUtils.getConnection(); r?Jxl<
conn.setAutoCommit(false); kCfSF%W&
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); qH!}oPeU'
for(int i=0;i<CountCache.list.size();i++){ ;ZXP*M9
CountBean cb=(CountBean)CountCache.list.getFirst(); y
,isK
CountCache.list.removeFirst(); "r @RDw
ps.setInt(1, cb.getCountId()); {k] 2h4 &h
ps.executeUpdate();⑴ NLFs)6\
//ps.addBatch();⑵ GdG1e%y]z
} $fhrGe
//int [] counts = ps.executeBatch();⑶ 8v@6 &ras@
conn.commit(); B3K!>lz
}catch(Exception e){ S>}jsP:V
e.printStackTrace(); 26JP<&%L
} finally{ 3xef>Xv=
try{ n={}='
if(ps!=null) { \kcJF'JFA0
ps.clearParameters(); z_R^n#A~r
ps.close(); JL $6Fw;
ps=null; fpf1^TZ
} LSb3w/3M
}catch(SQLException e){} {PgB~|W
DBUtils.closeConnection(conn); R 5 47
} {9U<!
} r|4jR6%<'m
public long getLast(){ BM=`zGh"
return lastExecuteTime; `?LQd2p
} ta"/R@ k*
public void run(){ SY|r'8Z%Q
long now = System.currentTimeMillis(); qJ|ByZ.N+
if ((now - lastExecuteTime) > executeSep) { [1B F8:
//System.out.print("lastExecuteTime:"+lastExecuteTime); J9S9rir&
//System.out.print(" now:"+now+"\n"); D}'g4Ag
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); mj5$ 2J
lastExecuteTime=now; Ol H{!
executeUpdate();
c+?L?s`"
} },'hhj]O
else{ 6cz%>@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =2uE\6Fl,
} (q`Jef
} 0/hX3h
} *I%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 p 7IJ3YY
FP<RoA?W
类写好了,下面是在JSP中如下调用。 "
]
0ER
l=D E|:
<% 2uFaAAT
CountBean cb=new CountBean(); ov: h4
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); b\NWDH7}
CountCache.add(cb); xb\(>7M6Y
out.print(CountCache.list.size()+"<br>"); =o;QvOS;
CountControl c=new CountControl(); -v?,{?$0
c.run(); &&$/>[0=.
out.print(CountCache.list.size()+"<br>"); zrk/}b0j
%>