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: B f.- 5
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CountBean.java dChMjaix
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/* u!t<2`:h
* CountData.java JC/nHM
* ih: XC
* Created on 2007年1月1日, 下午4:44 R\x3'([A5
* #f_.
* To change this template, choose Tools | Options and locate the template under 02YmV%
* the Source Creation and Management node. Right-click the template and choose $Xs`'>,"
* Open. You can then make changes to the template in the Source Editor. YmHu8H_Q
*/ o,/w E
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package com.tot.count; CbOCL~ "
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/** 3MDs?qx>s
* h:KEhj\d?
* @author ss`Sl$
*/ E9'
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public class CountBean { 7}pg7EF3z
private String countType; 4v9d&
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int countId; VuD{t%Jb
/** Creates a new instance of CountData */ f*Os~@K
public CountBean() {} W<$!H
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public void setCountType(String countTypes){ bas1(/|S
this.countType=countTypes; Mt@Ma ]!
} COHook(:
public void setCountId(int countIds){ B#3Q4c$
this.countId=countIds; {+EnJ"
} F?qg?1vB|
public String getCountType(){ dk 0} q6~
return countType; '1~;^rU
} >Sb3]$$
public int getCountId(){ i1*0'x
return countId; yJ;Qe_up
} l hST%3Ld
} D
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CountCache.java T1'\!6_5
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/* hE<Sm*HU
* CountCache.java N|3#pHm@
* rinTB|5
* Created on 2007年1月1日, 下午5:01 YOUB%N9+
* ce; zn\
* To change this template, choose Tools | Options and locate the template under S)/548=`
* the Source Creation and Management node. Right-click the template and choose u4bVp+
* Open. You can then make changes to the template in the Source Editor. l]gW_wUQd
*/ 2'-84
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package com.tot.count; zg$ag4%Qgg
import java.util.*; 6YV"H
/** ? % A2
* ;--D?Gs]Qr
* @author be$']}cP
*/ \L`x![$~q
public class CountCache { _dmG#_1
public static LinkedList list=new LinkedList(); Kr;=4xg=
/** Creates a new instance of CountCache */ a6O <t;&
public CountCache() {} tU *`X(;
public static void add(CountBean cb){ ia3!&rZ
if(cb!=null){ Zo
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list.add(cb); M|zTs\1I
} {m@tt{%
} H6Bw3I[
} \9uK^oS
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CountControl.java cOZBl;}
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/* .!Kqcz% A
* CountThread.java \CVHtV
* Xo&\~b#-
* Created on 2007年1月1日, 下午4:57 cbs ;
* adAdX;@e`
* To change this template, choose Tools | Options and locate the template under $RNHRA.
* the Source Creation and Management node. Right-click the template and choose +\)Y,@cw
* Open. You can then make changes to the template in the Source Editor. vU]n0)<KB
*/ @LSh=o+
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package com.tot.count; T7Y}v,+-
import tot.db.DBUtils; ]>Gi_20*.
import java.sql.*;
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/** &fl RrJ
* B2'TRXIm1U
* @author #TC}paIpj
*/ y)a)VvU":
public class CountControl{ &U7h9o H
private static long lastExecuteTime=0;//上次更新时间 MvnQUZ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 = ^Vp \
/** Creates a new instance of CountThread */ 6(uZn=
public CountControl() {} wG9aX*(n
public synchronized void executeUpdate(){ 9qgs*]J
Connection conn=null; `@v;QLD"d<
PreparedStatement ps=null; 4>a(!ht
try{ f-ceDn
conn = DBUtils.getConnection(); xSNGf@1b
conn.setAutoCommit(false); c!'\k,ma<9
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); SynRi/BRmw
for(int i=0;i<CountCache.list.size();i++){ ?u/UV,";y
CountBean cb=(CountBean)CountCache.list.getFirst(); {?2|rv)
CountCache.list.removeFirst(); 'W>y v
ps.setInt(1, cb.getCountId()); <RZqs
ps.executeUpdate();⑴ #f HnM+
//ps.addBatch();⑵ +8x_f0<
} DvB{N`COd
//int [] counts = ps.executeBatch();⑶ '$EyVu!
conn.commit(); -sZb+2tDa
}catch(Exception e){ Li"+`
e.printStackTrace(); EWgJ"WTF
} finally{ A~lc`m-
try{ E*wG5]at
if(ps!=null) { #z<#oC5
ps.clearParameters(); EtaKo}!A}
ps.close(); ! K_<hNG&
ps=null; C/#pK2xY
} !c1M{klP
}catch(SQLException e){} jD}h`(bE
DBUtils.closeConnection(conn); ?6{g7S%
} kS=nH9
} dUt4]
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public long getLast(){ F",TP,X
return lastExecuteTime; ",J&UTUh
} 6vR6=@(`>
public void run(){ p<#aXs jy
long now = System.currentTimeMillis(); .4tu{\YX
if ((now - lastExecuteTime) > executeSep) { 0t}v@-abU
//System.out.print("lastExecuteTime:"+lastExecuteTime); dJ Q K|/
//System.out.print(" now:"+now+"\n"); 19c_=$mV
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); >]ZE<.
lastExecuteTime=now; 9==4T$nM[
executeUpdate(); \w>Rmf'|
} Ui" {0%
else{ ;UM(y@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); sgGA0af
} T*PEUq
} ipg`8*My
} OFyy!r@?
//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 doHE]gC2Uz
vmrs(k "d#
类写好了,下面是在JSP中如下调用。 c s*E9
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<% <FBBR2
CountBean cb=new CountBean(); oH?:(S(
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); AWx@Z7\z"g
CountCache.add(cb); 5N%d Les
out.print(CountCache.list.size()+"<br>"); e98QT9
CountControl c=new CountControl(); jll:Rh(b
c.run(); xH{-UQ3R
out.print(CountCache.list.size()+"<br>"); `PL}8ydZ
%>