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: Oz:J8l%
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CountBean.java s?g`ufF.t
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/* s,*kWy"jp
* CountData.java 0kp#+&)+
* Q-qM"8I
* Created on 2007年1月1日, 下午4:44 P t)Ni
* 8>KBh)q
* To change this template, choose Tools | Options and locate the template under 6S2u%-]
* the Source Creation and Management node. Right-click the template and choose y`n'>F11
* Open. You can then make changes to the template in the Source Editor. x2M'!VK>n1
*/ d;-/F b{4
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package com.tot.count; L,<5l?u
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/** a1 I"Sh
* 3S97hn{|=
* @author M]RbaXZ9
*/ p903*F^[,
public class CountBean { rpZ^R}B%*v
private String countType; vj?6,Ae
int countId; x^ J}]5{0
/** Creates a new instance of CountData */ |1@/gqa
public CountBean() {} Bn5O;I13
public void setCountType(String countTypes){ \en}8r9cy
this.countType=countTypes; dg?[gD8!4&
} I\|x0D
public void setCountId(int countIds){ n>
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this.countId=countIds; = DT7]fU
} +$b_,s
public String getCountType(){ wP <)
return countType; bc{ {a
} EC]b]'._
public int getCountId(){ .8O.
return countId; 0)?.rthk4S
} %e71BZo~^s
} YjT7_|`(]
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CountCache.java z
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/* \+STl#3*q
* CountCache.java PZDj)x_%B&
* S5W*,?
* Created on 2007年1月1日, 下午5:01 /;[Zw8K7
* rerl-T<3
* To change this template, choose Tools | Options and locate the template under (q@DBb4
* the Source Creation and Management node. Right-click the template and choose <DM
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* Open. You can then make changes to the template in the Source Editor. OjUZ-_J
*/ &f:"p*=a\
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package com.tot.count; Rqk;!N
import java.util.*; is2OJ,
/** n&51_.@Q
* yd-r7iq
* @author +a{P,fRl@
*/ O7MFKAaD
public class CountCache { l.V{H<v}
public static LinkedList list=new LinkedList(); o!";&\,Ip
/** Creates a new instance of CountCache */ p7\}X. L
public CountCache() {} W6d[v/+K+
public static void add(CountBean cb){ _9^
if(cb!=null){ K)z!e;r
list.add(cb); R`_RcHY:
} RbY=OOQ
} |@rPd=G^(/
} O!3MXmaO
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CountControl.java bw@"MF{
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/* ?3x7_=4t@
* CountThread.java (}E ] g
* }AZ0BI,TI
* Created on 2007年1月1日, 下午4:57 aMxg6\8
* ~BSIp
.
* To change this template, choose Tools | Options and locate the template under ;~2RWj=-
* the Source Creation and Management node. Right-click the template and choose w=UFj
* Open. You can then make changes to the template in the Source Editor. sn4wd:b7%
*/ d^0vaX6e}
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package com.tot.count; LFi 8@
import tot.db.DBUtils; F@76V$U.
import java.sql.*; E>bK-jG
/** bpQ5B'9
* #`1@4,iC
* @author sbxOnwP\
*/ tML[~AZh
public class CountControl{ ,<pk&54.@'
private static long lastExecuteTime=0;//上次更新时间 ]
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ~w&_l57
/** Creates a new instance of CountThread */ D9cpw0{nc
public CountControl() {} .+;;-]})
public synchronized void executeUpdate(){ .%.bIT
Connection conn=null; ?8g*"&cn
PreparedStatement ps=null; GkhaB(btk'
try{ oi@/H\7j
conn = DBUtils.getConnection(); jJ}3WJ
conn.setAutoCommit(false); yc#0c[ZQu
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); lji&]^1
for(int i=0;i<CountCache.list.size();i++){ CSUXa8u7
CountBean cb=(CountBean)CountCache.list.getFirst(); lk$@8h$vS
CountCache.list.removeFirst(); 9K9{$jN~
ps.setInt(1, cb.getCountId()); *0K@^Db-
ps.executeUpdate();⑴ ({GN.pC(
//ps.addBatch();⑵ 3X0"</G6
} G,VTFM6
//int [] counts = ps.executeBatch();⑶ J
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conn.commit(); <"93
}catch(Exception e){ \c"{V-#o\
e.printStackTrace(); %Km^_JM
} finally{ -v'|#q
try{ G(g.~|=EZ
if(ps!=null) { yX^/Oc@j
ps.clearParameters(); Rh[%UNl
ps.close(); @Kx@ 2#~b
ps=null; s/;iZiWK
} 8f\sG:$
}catch(SQLException e){} +A
4};]W|
DBUtils.closeConnection(conn); @w%{yzr%
} 6AM-^S@
} =B0#z]qu
public long getLast(){ -HE@wda
return lastExecuteTime; ^
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} d".Xp4}f
public void run(){ k>2tC<
long now = System.currentTimeMillis(); =JqKdLH
if ((now - lastExecuteTime) > executeSep) { kw%vO6"q(
//System.out.print("lastExecuteTime:"+lastExecuteTime); aBBTcN%'
//System.out.print(" now:"+now+"\n"); }mZsK>
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); `t@Rh~B
lastExecuteTime=now; Pjs
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executeUpdate(); bJ~@
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} l,I[r$TCf
else{ 8&g`Uy/b
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); lURL;h
} 6X2~30pdE
} s.9)?<[
} sQ4~oZZ
//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 )IFzal}o
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类写好了,下面是在JSP中如下调用。 C78V/{
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<% sX8?U,u
CountBean cb=new CountBean(); ai3wSUYJi
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); i9QL}d
CountCache.add(cb); 5Tl3k=o}
out.print(CountCache.list.size()+"<br>"); 2feiD?0
CountControl c=new CountControl(); 3M?vK(zG>P
c.run(); c]u^0X?&
out.print(CountCache.list.size()+"<br>"); "JH
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