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: .(2Zoa
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CountBean.java 71)DLGL
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/* c5vi Y|C^
* CountData.java m+3U[KKvG
* A9:dHOmT^U
* Created on 2007年1月1日, 下午4:44 d z-
* e#R'_}\yj
* To change this template, choose Tools | Options and locate the template under -~PiPYX
* the Source Creation and Management node. Right-click the template and choose .YYLMI
* Open. You can then make changes to the template in the Source Editor. OVy ZyZ#
*/ ke~S[bL%-
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package com.tot.count; A7eF.V&
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/** |_ChK6Q?v
* 2%i3[N*
* @author
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*/ nKR=/5a4Y
public class CountBean { v"Z`#Bi
private String countType; <aScA`\B#
int countId; I7[F,xci
/** Creates a new instance of CountData */ H0 %;t
public CountBean() {} &IZthJqV
public void setCountType(String countTypes){ "3\C;B6I
this.countType=countTypes; +DpiX&^h
} @ xBw'
public void setCountId(int countIds){ KeIk9T13O
this.countId=countIds; fc,^H&
} 2u=Nb0
public String getCountType(){ .5ItH^
return countType; n#.~XNbxv
} r6x"D3
public int getCountId(){ O=A(x m#
return countId; uyfH;9L5$
} kr=&x)Wy!
} FlqE!6[[
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CountCache.java @ff83Bg
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/* CnvM>]
* CountCache.java \i}:Vb(^
* i#RT4}l"a
* Created on 2007年1月1日, 下午5:01 "=/YPw^0
* ar!`8"
* To change this template, choose Tools | Options and locate the template under LYV\|a{Y
* the Source Creation and Management node. Right-click the template and choose Z~WUILx,
* Open. You can then make changes to the template in the Source Editor. ~Wox"h}(
*/ *fIb|r
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package com.tot.count; KK|AXoBf
import java.util.*; FVw4BUOmi
/** <,Z6=M`
* u]!ZW&
* @author VEtdp*ot
*/ RqenPMk
public class CountCache { {)c2#h
public static LinkedList list=new LinkedList(); EU0b>2n4
/** Creates a new instance of CountCache */ c8"9Lv
public CountCache() {} i!U,qV1
public static void add(CountBean cb){ 4,yS7l
if(cb!=null){ Oosr`e@S
list.add(cb); ._$tNGI4
} C'a%piX
} UmC_C[/n?
} XLeQxp=
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CountControl.java js~?y|e8k
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/* h\@\*Xz<v
* CountThread.java FU~xKNr
* H fg2]N
* Created on 2007年1月1日, 下午4:57 qVpV ZH!
* X`n)]~
* To change this template, choose Tools | Options and locate the template under uq~Z
* the Source Creation and Management node. Right-click the template and choose .>.B
* Open. You can then make changes to the template in the Source Editor. :zWI"
*/ ("+J*u*kq_
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package com.tot.count; ST*\ Q
import tot.db.DBUtils; 04u^Q
import java.sql.*; .h0@Vs
/** ^V1iOf:
* -F+
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* @author _3_kvs
*/ \@3B%RW0
public class CountControl{ XlPi)3m4/S
private static long lastExecuteTime=0;//上次更新时间 zP
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [lmghI!
/** Creates a new instance of CountThread */ f
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public CountControl() {} m7|}PH"7
public synchronized void executeUpdate(){ WaaF;|,(
Connection conn=null; .d4L@{V
PreparedStatement ps=null; fs:%L
try{ 9Ez>srH(
conn = DBUtils.getConnection(); m#^ua^JV
conn.setAutoCommit(false); mw[T[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); S1!X;PP/
for(int i=0;i<CountCache.list.size();i++){ ~o+:M0)}
CountBean cb=(CountBean)CountCache.list.getFirst(); L355uaj
CountCache.list.removeFirst(); uVQH,NA,
ps.setInt(1, cb.getCountId()); n[mVwQ(%
ps.executeUpdate();⑴ 4=Wtv/
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//ps.addBatch();⑵ .:`+4n
} aR2Vvo
//int [] counts = ps.executeBatch();⑶ d"P\ =`+
conn.commit(); f4h|Nn%;
}catch(Exception e){ @lYm2l^
e.printStackTrace(); S~ff<A>f
} finally{ ;`{PA
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try{ ? 0}M'L
if(ps!=null) { /|)VO?*D
ps.clearParameters(); ~)ecQ
ps.close(); XVlZ:kz
ps=null; m$bX;F}T
}
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}catch(SQLException e){} ek^=Z`
DBUtils.closeConnection(conn); 5
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} w[WyT`6h!
}
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public long getLast(){ e13{G@
return lastExecuteTime; 9L"Z
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} ~=!d>f~U
public void run(){
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long now = System.currentTimeMillis(); /YyimG7
if ((now - lastExecuteTime) > executeSep) { d-W@/J
//System.out.print("lastExecuteTime:"+lastExecuteTime); "5 /i
//System.out.print(" now:"+now+"\n"); WRq:xDRn0
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); |>Q]q
lastExecuteTime=now;
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executeUpdate(); WT-BHB1
} ir72fSe
else{ ')bas#=uP
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); \A{ [2
} (O$PJLI
} )@IDmz>
} ,C=Lu9
//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 pd3=^Zi
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类写好了,下面是在JSP中如下调用。 ke+3J\;>
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<% _RT JEG
CountBean cb=new CountBean(); 9*thqs3J#d
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); x)wlp{rLf
CountCache.add(cb); k3pY3TA@w+
out.print(CountCache.list.size()+"<br>"); 1\[En/6
CountControl c=new CountControl(); Gr&)5hm$
c.run(); [SJ)4e|)
out.print(CountCache.list.size()+"<br>"); q&:UP
%>