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: PUdv1__C
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CountBean.java QiPqN$n
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/* !nmZ"n|}p
* CountData.java X|of87
* >^Nnhnr
* Created on 2007年1月1日, 下午4:44 ?%O>]s
* -)V0D,r$[
* To change this template, choose Tools | Options and locate the template under BZeEZ2"
* the Source Creation and Management node. Right-click the template and choose pzF_g-B
* Open. You can then make changes to the template in the Source Editor. T\6Qr$t
*/ X`8<;l
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package com.tot.count; 1-kuK<KR
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/** 9jal D
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* Ia2WBs=
* @author e{)giJY9
*/ z|g2Q#$-\S
public class CountBean { 4 9qa
private String countType; e@'x7Zzh
int countId; 8FsQLeOE
/** Creates a new instance of CountData */ t[|oSF#i
public CountBean() {} NLsF6BX/-
public void setCountType(String countTypes){ wT@Z|.)
this.countType=countTypes; M\1CDU+*Ns
} g\aO::
public void setCountId(int countIds){ +ai3
this.countId=countIds; N.|F8b]v
} T8 FW(Gw#
public String getCountType(){ _}{KS, f]0
return countType; (j8*F Bq
} @-q,%)?0}=
public int getCountId(){ )]>t(
return countId; ,N$Q']Td
} NEBhVh
} Qf:e;1F!
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CountCache.java 8lk/*/} =<
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/* }9OMXLbRv
* CountCache.java X@~/.H5
* pSx5ume95"
* Created on 2007年1月1日, 下午5:01 lxn/97rA
* 1hbQ30
* To change this template, choose Tools | Options and locate the template under a~2Jf @I3
* the Source Creation and Management node. Right-click the template and choose 1j2U,_-
* Open. You can then make changes to the template in the Source Editor.
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*/ rJ/HIda
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package com.tot.count; `I7s|9-=
import java.util.*; XT^=v6^H
/** ]}`t~#Irz
* -jjB2xP
* @author 8:Hh;nl
*/ 5OdsT-y
public class CountCache { HNkOPz+d&8
public static LinkedList list=new LinkedList(); r/h\>s+N
/** Creates a new instance of CountCache */ }s2CND
public CountCache() {} :(q4y-o6
public static void add(CountBean cb){ W6?=9].gc
if(cb!=null){ |gkNhxzB
list.add(cb); <:-4GJH=
} zC*FeqFL<
} 7FwtBO
} u>fs
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CountControl.java WsTIdr36x
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/* v&:[?<6-
* CountThread.java ?>7\L'n=5I
* 0A}XhX
* Created on 2007年1月1日, 下午4:57 veDv14
* zlLZ8b+
* To change this template, choose Tools | Options and locate the template under 3Ei^WDJ
* the Source Creation and Management node. Right-click the template and choose W[jg+|
* Open. You can then make changes to the template in the Source Editor. 0\i\G|5
*/ 6jpzyf=~
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package com.tot.count; @<K<"`~H
import tot.db.DBUtils;
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import java.sql.*; aG1Fj[,
/** q}i#XQU
* T4x%3-4;
* @author .XgY&5Qk
*/ ^E%R5JN
public class CountControl{ -#%M,Qb
private static long lastExecuteTime=0;//上次更新时间 w&@tP^`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [Or1
/** Creates a new instance of CountThread */ Q
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public CountControl() {} c@>ztQU*
public synchronized void executeUpdate(){ KXMf2)pa
Connection conn=null; Lginps[la
PreparedStatement ps=null; E+y_te^+b
try{ p;4FZ$
conn = DBUtils.getConnection(); |X{j^JP5
conn.setAutoCommit(false); C.4(8~Y=~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 6$#,$a O
for(int i=0;i<CountCache.list.size();i++){ Kmx4bp4
CountBean cb=(CountBean)CountCache.list.getFirst(); 5kqI
CountCache.list.removeFirst(); G5hRx@vfrL
ps.setInt(1, cb.getCountId()); km>ZhsqD
ps.executeUpdate();⑴ /Ey%aA4v
//ps.addBatch();⑵ =U84*HAv
} $`OyGeq"T
//int [] counts = ps.executeBatch();⑶ d/GSG%zB
conn.commit(); tnpEfi-
}catch(Exception e){ IV~)BW leT
e.printStackTrace(); C32*RNG?U
} finally{ f)vnm*&-
try{ xS,F
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if(ps!=null) { #Q2s3"X[
ps.clearParameters(); XK~HfA?
ps.close(); USART}Us4
ps=null; jR\pYRK
} dr#%~I
}catch(SQLException e){} T=NLBJ
DBUtils.closeConnection(conn); g)f& mQ)
} [Zdrm:=]L
} 8XV RRk
public long getLast(){ 6b*xhu\
return lastExecuteTime; `C_qqf
} i^WY/ OhL
public void run(){ i&(1<S>P
long now = System.currentTimeMillis(); L0VZ>!*o
if ((now - lastExecuteTime) > executeSep) { H8g6ZCU~
//System.out.print("lastExecuteTime:"+lastExecuteTime); h5P ]`r
//System.out.print(" now:"+now+"\n"); vo Et\H
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ;Q3[} ]su
lastExecuteTime=now; 62;xK-U
executeUpdate(); nK< v
} u ^#UsOt+
else{ %i7U+v(d
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); #n&/v'!\
} y?cN
} 0.m-}
} G9&2s%lu.e
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 I>rTqOK
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类写好了,下面是在JSP中如下调用。 [qY yr
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<% 1z|bQ,5
CountBean cb=new CountBean(); xA^E+f:W_
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); yC
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CountCache.add(cb); G>?kskm
out.print(CountCache.list.size()+"<br>");
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CountControl c=new CountControl(); C-ORI}o
c.run(); dU_;2d$
out.print(CountCache.list.size()+"<br>"); FD!8o
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