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: ez|)ph7
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CountBean.java `EaLGzw
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/* E 7{U|\
* CountData.java H*}y^)x
* ~A\GT$
* Created on 2007年1月1日, 下午4:44 ;0Tx-8l
* uLV#SQ=bZN
* To change this template, choose Tools | Options and locate the template under `x*Pof!Io
* the Source Creation and Management node. Right-click the template and choose +{oG|r3L
* Open. You can then make changes to the template in the Source Editor. c24dSNJg,
*/ U>Slc08N
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package com.tot.count; iUN Ib
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/** #"G]ke1l$
* ,0!}7;j_c
* @author {N+$Q'
*/ GB=X5<;
public class CountBean { #AJM6* G9
private String countType; $|@
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int countId; gDpVeBd[
/** Creates a new instance of CountData */ 1ukTA@Rj&
public CountBean() {} EFM5,gB.m
public void setCountType(String countTypes){ YpVD2.jy
this.countType=countTypes; T{-CkHf9Q
} ~UP[A'9jJ
public void setCountId(int countIds){ J cd-
this.countId=countIds; J| w>a
} VZKvaxIk6
public String getCountType(){ gi1^3R[
return countType; .[ICx
} RMdk:YvBg
public int getCountId(){ .(cw>7e3D
return countId; [_EZhq
} m+]K;}.}R
} X aMJDa|M
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CountCache.java ,s"^kFl
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/*
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* CountCache.java 0Qf,@^zL*
* P/W
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* Created on 2007年1月1日, 下午5:01 [M=7M}f;
* ig/xv
* To change this template, choose Tools | Options and locate the template under cK( C&NK
* the Source Creation and Management node. Right-click the template and choose GjvOM y
* Open. You can then make changes to the template in the Source Editor. VA#"r!1
*/ I&x=;
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package com.tot.count; p8Qk'F=h
import java.util.*; *RJG!t*t
/** qm/22:&v5
* V_ .5b&@
* @author Q+{xZ'o"Z
*/ A P?R"%
public class CountCache { D2Kp|F;
public static LinkedList list=new LinkedList(); tEvut=k'
/** Creates a new instance of CountCache */ *0Skd
public CountCache() {} vApIHI?-
public static void add(CountBean cb){ G[uK -U
if(cb!=null){ (x;@%:3j$
list.add(cb); n FHUy9q
} "R;U/+
} ;n*.W|Uph
} =O5pY9UO
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CountControl.java kTOzSiq
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/* f<d`B]$(
* CountThread.java s<<ooycBrQ
* ];[}:f
* Created on 2007年1月1日, 下午4:57 dO!
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* ^BikV
* To change this template, choose Tools | Options and locate the template under *av<E
* the Source Creation and Management node. Right-click the template and choose bN1|q|9
* Open. You can then make changes to the template in the Source Editor. f@wquG'
*/ <lPm1/8
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package com.tot.count; BYL)nCc
import tot.db.DBUtils; /T0F"e)Ci
import java.sql.*; 1Y\DJ@lh
/** ) j#`r/
* FpmM63$VN[
* @author 2*;~S44
*/ H)kwQRfu
public class CountControl{ 9<6;Hr,>G
private static long lastExecuteTime=0;//上次更新时间 P64PPbP
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _Xe>V0
/** Creates a new instance of CountThread */ un mJbY;t
public CountControl() {} O:;w3u7;u
public synchronized void executeUpdate(){ c_$=-Khk
Connection conn=null; -P$PAg5"2
PreparedStatement ps=null; %rL.|q9
try{ NX*Q F+
conn = DBUtils.getConnection(); O`IQ(,yef
conn.setAutoCommit(false); 'T*&'RQr
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); dVtG/0
for(int i=0;i<CountCache.list.size();i++){ pZ.ecZe/
CountBean cb=(CountBean)CountCache.list.getFirst(); NvceYKp:
CountCache.list.removeFirst(); S6Q
ps.setInt(1, cb.getCountId()); -">;-3,K
ps.executeUpdate();⑴ u5`u>.!
//ps.addBatch();⑵ -:+|zF@f
} 6jD=F ^jw
//int [] counts = ps.executeBatch();⑶ r=
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conn.commit(); PbJ(:`u
}catch(Exception e){ we//|fA<
e.printStackTrace(); cJ=6r
:
} finally{ $f
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try{ ]nn98y+
if(ps!=null) { %D{6[8
ps.clearParameters(); i
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ps.close(); ]g3JZF-
ps=null; BO?%'\
} zZPO&akB"
}catch(SQLException e){} nV|EQs4(
DBUtils.closeConnection(conn); mp1@|*Sn
} Uiw2oi&_
} HAdg/3Hw
public long getLast(){ ?=sDM& '
return lastExecuteTime; :%=Xm
} @Md/Q~>
public void run(){ yLvDMPj
long now = System.currentTimeMillis(); < `=j^LU
if ((now - lastExecuteTime) > executeSep) { UERLtSQ
//System.out.print("lastExecuteTime:"+lastExecuteTime); JX;<F~{.
//System.out.print(" now:"+now+"\n"); 0*3R=7_},o
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); gh]cXuph
lastExecuteTime=now; ]m3HF&
executeUpdate(); lfow1WRF
} E4jNA}3k+
else{ vH@ds
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 2*& ^v
} vm8eZG|
} ?(1y
} rH Lm\3
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 &jJL"gq"
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类写好了,下面是在JSP中如下调用。 F0TB<1
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<% ,?%Zc$\LW
CountBean cb=new CountBean(); b4 6~?*
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `Y$4 H,8L
CountCache.add(cb); *~e?TfG
out.print(CountCache.list.size()+"<br>"); eF$x 1|
CountControl c=new CountControl(); & '`g#N
c.run(); F v2-(
out.print(CountCache.list.size()+"<br>"); "%w u2%i
%>