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: 12
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CountBean.java WZz8VF
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/* a!UQ]prT
* CountData.java )8`7i{F
* y|r+<
* Created on 2007年1月1日, 下午4:44 R*Jnl\?>@
* j\W"P_ dpd
* To change this template, choose Tools | Options and locate the template under e/+_tC$@p@
* the Source Creation and Management node. Right-click the template and choose 8 xfn$
* Open. You can then make changes to the template in the Source Editor. Y0nnn
*/ pq8XCOllXx
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package com.tot.count; k'O^HMAn!
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/** Swugt"`nN
* f
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* @author )`,||sQ
*/ f3,qDbQyJ
public class CountBean { >Z0F n
private String countType; xJCMxt2Y
int countId; X[' VZz7
/** Creates a new instance of CountData */ E
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public CountBean() {} 71euRIW'5
public void setCountType(String countTypes){ Be~__pd
this.countType=countTypes; nV/8u_
} zK Rt\;PW
public void setCountId(int countIds){ 2~`lvx
this.countId=countIds; @bPR"j5D
} ;/ wl.'GA
public String getCountType(){ X<:B"rPuK
return countType; N, `q1B
} @zu IR0Gr)
public int getCountId(){ TcW-pY<N
return countId; 91I6-7# Xt
} Vq8 G( <77
} U.XvS''E
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CountCache.java k2bjBAT
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/* KGM9
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* CountCache.java VT>TmfN(I
* +0,'B5 (E
* Created on 2007年1月1日, 下午5:01 &%@e6..Ex
* rV{:'"=y-
* To change this template, choose Tools | Options and locate the template under l=|>9,La
* the Source Creation and Management node. Right-click the template and choose }%8 :8_Ke
* Open. You can then make changes to the template in the Source Editor. @=
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*/ E[$"~|7|$
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package com.tot.count; g`7C1&U*T
import java.util.*; ,W8EU
/** %@L[=\
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* ko-3`hX`
* @author KU]co4]8^s
*/ Za[?CA
public class CountCache { e0s*
public static LinkedList list=new LinkedList(); ;2#9q9(
/** Creates a new instance of CountCache */ C8{bqmlm@
public CountCache() {} BE0Ov{'
public static void add(CountBean cb){ t`M4@1S"'
if(cb!=null){ Cs:?9G
list.add(cb); 8
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} }Z="}Dg|T
} <bSG|VqnH
} )2z<5 `
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CountControl.java wDQ@$T^vh
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/* Q,ezAE
* CountThread.java ^`~s#L7
* $&25hvK,
* Created on 2007年1月1日, 下午4:57 rCK
* %>p[;>jW
* To change this template, choose Tools | Options and locate the template under G_m $?0\
* the Source Creation and Management node. Right-click the template and choose ]!c59%f=
* Open. You can then make changes to the template in the Source Editor. r5RUgt
*/ J#>)+
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package com.tot.count; x5w5xw
import tot.db.DBUtils; &nV/XLpG
import java.sql.*; lQS(\}N
/** ^cUmLzM
* "h@=O
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* @author #r|qitL3
*/ R\a6#u3
public class CountControl{ FmtgH1u:=
private static long lastExecuteTime=0;//上次更新时间 I`~Giz7@
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ^ABtg#
/** Creates a new instance of CountThread */ >^=;b5I2K
public CountControl() {} 1+F0$<e}
public synchronized void executeUpdate(){ G?M<B~}
Connection conn=null; 12i<b
PreparedStatement ps=null; %nS(>X<B
try{ eS`ZC!W
conn = DBUtils.getConnection(); elqm/u
conn.setAutoCommit(false); JRw<v4pZ
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Ao )\/AR'
for(int i=0;i<CountCache.list.size();i++){ ybC0Ee@
CountBean cb=(CountBean)CountCache.list.getFirst(); Aaw]=8 OI
CountCache.list.removeFirst(); ~hZr1hT6L
ps.setInt(1, cb.getCountId()); exZgk2[0
ps.executeUpdate();⑴ 2jVvK"C
//ps.addBatch();⑵ '^n,)oA/G
} .Ei#mG-=}&
//int [] counts = ps.executeBatch();⑶ }WA=
conn.commit(); !.G knDT
}catch(Exception e){ cMfJq}C<
e.printStackTrace(); I!?)}d
} finally{ q90
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try{ G$^u2wz.
if(ps!=null) { <(!~s><.
ps.clearParameters(); \N%L-%^
ps.close(); :hBLi99
o
ps=null; s/l>P~3=
} 1gA^Qv~?
}catch(SQLException e){} DL*&e|:q
DBUtils.closeConnection(conn); [;C|WTYSL
} Zv0'OX~8i
} {'-^CoR
public long getLast(){ %{|67h
return lastExecuteTime; zH13~\
} 6Y%{ YQ}s|
public void run(){ 2@6Qifxd@
long now = System.currentTimeMillis(); Ueu~803~
if ((now - lastExecuteTime) > executeSep) { Lp7h'|]u
//System.out.print("lastExecuteTime:"+lastExecuteTime); 0iAQ;<*xi
//System.out.print(" now:"+now+"\n"); w)Xn MyD(P
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); OcE,E6LD
lastExecuteTime=now; ZBkbr
executeUpdate(); aI\:7
} hAV@/oQ
else{ dw-o71(1d
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); BMo2t'L
} :anR/
} $qR<_6j
} k|^YYi=xF
//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 KY%LqcC
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类写好了,下面是在JSP中如下调用。 3s0I<cL
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<% V"|`Z}XW
CountBean cb=new CountBean(); @iU(4eX
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^H!45ph?Jc
CountCache.add(cb); qoP/`Y6
out.print(CountCache.list.size()+"<br>"); ]i/Bq!d l
CountControl c=new CountControl(); M+VAol}1
c.run(); :'4",
out.print(CountCache.list.size()+"<br>"); >qU5 (M_&L
%>