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: |TF6&$>d
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CountBean.java \JCpwNT{P
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/* V^><
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* CountData.java Hq?dqg' %~
* g:6`1C
* Created on 2007年1月1日, 下午4:44 ;RQ}OCz9}8
* sheCwhV
* To change this template, choose Tools | Options and locate the template under }D3hP|.X
* the Source Creation and Management node. Right-click the template and choose ; 3sjTqD
* Open. You can then make changes to the template in the Source Editor. FF|M7/[~
*/ [o7Qr?RN
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package com.tot.count; F[)tg#}@G
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/** tbfwgK
* 6uk}4bdvq
* @author TQ%F\@"
*/ %ZDO0P !/
public class CountBean { ~~m(CJ4S
private String countType; =8"xQ>D62
int countId; r029E-
/** Creates a new instance of CountData */ 0< }BSv
public CountBean() {} ,,Ivey!kL
public void setCountType(String countTypes){ YOA)paq+
this.countType=countTypes; ?V(+Cc
} 6!;D],,"#.
public void setCountId(int countIds){ k\g:uIsv$
this.countId=countIds; vWL|vR
} ZG~d<kM&8s
public String getCountType(){ 9ESV[
return countType; .&8a ;Q?c
} $ERiBALN:
public int getCountId(){ :oiHf:
return countId; %&s4YD/{
} {K:]dO
} &;<'AF
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CountCache.java ]*Kv[%r07c
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/* 1?Tj
* CountCache.java 8]bLp
* h2i1w^f
* Created on 2007年1月1日, 下午5:01 #)iPvV'
* {.e^1qE
* To change this template, choose Tools | Options and locate the template under hZ"Sqm]
* the Source Creation and Management node. Right-click the template and choose 0JqvV
* Open. You can then make changes to the template in the Source Editor. eF' l_*
*/ gyT0h?xDt
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package com.tot.count; Z.s0ddMs
import java.util.*; (CJx Y(1K
/** A5_r(Z-5
* o*oFCR]j
* @author .kgt?r
*/ X!@ Y,
public class CountCache { "M^mJl&*b
public static LinkedList list=new LinkedList(); ySF^^X$J
/** Creates a new instance of CountCache */ Y_~otoSoY
public CountCache() {} (Ap?ixrR_
public static void add(CountBean cb){ y'non0P.
if(cb!=null){ >Pvz5Hf/wW
list.add(cb); ;krIuk-
} upZf&4 I8
} &VG
} iqN?'8
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CountControl.java ksUF(lYk
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/* }d5~w[
* CountThread.java O]Yz7
* \l`{u)V
* Created on 2007年1月1日, 下午4:57 H?V
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* 6)>otB8)J
* To change this template, choose Tools | Options and locate the template under ofPv?_@
* the Source Creation and Management node. Right-click the template and choose y!
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* Open. You can then make changes to the template in the Source Editor. _6g(C_m'T?
*/ s=556
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package com.tot.count; iJCv+p_f
import tot.db.DBUtils; jvo^I$|2h
import java.sql.*; o8NRu7@?
/** 2^f7GP
* )CgH|z:=b
* @author imKMPO=
*/ !fjB oK+
public class CountControl{ Q{yjIy/b
private static long lastExecuteTime=0;//上次更新时间 \^jRMIM==
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 wyXQP+9G
/** Creates a new instance of CountThread */ @rF|WT
public CountControl() {} :H+8E5
public synchronized void executeUpdate(){ MIh\z7gW
Connection conn=null; 1xSG(!
PreparedStatement ps=null; #&%>kfeJ)<
try{ i?7?I
conn = DBUtils.getConnection(); "b%FkD
conn.setAutoCommit(false); kv;P2:"|
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 77ztDQDtM
for(int i=0;i<CountCache.list.size();i++){ Ds#BfP7a
CountBean cb=(CountBean)CountCache.list.getFirst(); ,J:Ro N_:
CountCache.list.removeFirst(); q>5j (,6F
ps.setInt(1, cb.getCountId()); cS
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ps.executeUpdate();⑴ Fh|{ib
//ps.addBatch();⑵ !%.=35NS@E
} i6g=fx6j*
//int [] counts = ps.executeBatch();⑶ v-/vj/4>
conn.commit(); $dA]GWW5A
}catch(Exception e){ ]b:>7_la
e.printStackTrace(); 9Hd_sNUu\
} finally{ y*p02\)
try{ E=`/}2
if(ps!=null) { c5:X$k\
ps.clearParameters(); Z[eWey_
ps.close(); 2(m#WK7>F
ps=null; sz%_9;`dpL
} mkl^2V13~
}catch(SQLException e){} 1I)oT-~
DBUtils.closeConnection(conn); C2\zbC[qm
} A~ _2"
} *N"CV={No
public long getLast(){ n=|% H'U
return lastExecuteTime; C7DwA/$D
} <XN=v!2;
public void run(){ NCl@C$W9q
long now = System.currentTimeMillis(); d`~~Ww1
if ((now - lastExecuteTime) > executeSep) { -:OJX #j
//System.out.print("lastExecuteTime:"+lastExecuteTime); FZLx.3k4
//System.out.print(" now:"+now+"\n"); ?Ygd|a5
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &~2IFp
lastExecuteTime=now; 0=K8 nxdx
executeUpdate(); MH9vg5QKp
} +_+j"BT
else{ g4952u
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =itQ@``r
} 0%4OmLBT
} %%zlqd"0
} e[0"x.gu
//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 `csZ*$7
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类写好了,下面是在JSP中如下调用。 *ZxurbX#
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<% q6<P\CSHy<
CountBean cb=new CountBean(); _uXb>V*8
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); J_.cC
CountCache.add(cb); o{^`Y
out.print(CountCache.list.size()+"<br>"); K Hgn
CountControl c=new CountControl(); d ez4g
c.run(); ]}p<P):hO
out.print(CountCache.list.size()+"<br>"); ge<D}6GQ
%>