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: \ZSTKi?
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CountBean.java RN[]Jt#6
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/* }c%
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* CountData.java +8AvTSgX%
* \D?:J3H*]
* Created on 2007年1月1日, 下午4:44 ~*}$>@f{[X
* #~k[ 6YR 0
* To change this template, choose Tools | Options and locate the template under >)Gd:636+
* the Source Creation and Management node. Right-click the template and choose +`.,| |Mq
* Open. You can then make changes to the template in the Source Editor. F;u_7OM
*/ x=]S.XI
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package com.tot.count; Hx
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/** #Fs|f3-@
* &[_ZXVva~
* @author YT=eVg53
*/ g9KTn4
public class CountBean { aMTFW_w
private String countType; AW~"yI<
int countId; c@R; /m:R
/** Creates a new instance of CountData */ UTCzHh1
public CountBean() {} ,l HLH
public void setCountType(String countTypes){ y-9+a7j
this.countType=countTypes; +xp]:h|
} y-B=W]E
public void setCountId(int countIds){ *C6 D3y
this.countId=countIds; 51 b y
} +Ok%e.\ZM
public String getCountType(){ 6|!NLwa
return countType; 3c #s|qW
} cin2>3Z$
public int getCountId(){ |g-b8+.=]
return countId; \Q&,ISO\
} %8mm Hh
} VWi2(@R^
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CountCache.java !aNh!
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/* i]o"_=C
* CountCache.java ?j{C*|yHO
* NfzF.{nh
* Created on 2007年1月1日, 下午5:01 =o^|b ih
* v`DI<Lt
* To change this template, choose Tools | Options and locate the template under sx
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* the Source Creation and Management node. Right-click the template and choose 3`F) AWzdr
* Open. You can then make changes to the template in the Source Editor. =Z,5$6%)
*/ =X(%Svnp
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package com.tot.count; n~g LPHY
import java.util.*; Vz%OV}\
/** _A+w#kiv>
* 4=[7Em?oLb
* @author ^Q.,\TL01
*/ PaO-J&<
public class CountCache { qlsQ|/'D
public static LinkedList list=new LinkedList(); Yr+23Ro
/** Creates a new instance of CountCache */ 7G93,dJ
public CountCache() {} #X`8dnQZ
public static void add(CountBean cb){ K84^Oq
if(cb!=null){ cpZc9;@IC
list.add(cb); h#qN+qt}
} OqUr9?+
} "y;bsZBd"
} UMMB0(0D
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CountControl.java 9$1)k;ChP/
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/* u0o'K9.r
* CountThread.java zsXpA0~3s
* T:iP="?{
* Created on 2007年1月1日, 下午4:57 LM)`CELsYc
* X~9j$3lUBR
* To change this template, choose Tools | Options and locate the template under </"4 zD|
* the Source Creation and Management node. Right-click the template and choose 4QHS{tj
* Open. You can then make changes to the template in the Source Editor. If-_?wZe
*/ e}yX_Z'P<
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package com.tot.count; 3=0E!e
import tot.db.DBUtils; {zLhiUH
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import java.sql.*; O9M{ ).
/** b=;nm#cAI
* ;#/@+4@a&
* @author C.Uju`3
*/ RFaSwf,5n
public class CountControl{ 1bnBji
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Me5{_n
/** Creates a new instance of CountThread */ 5z}w}zdg
public CountControl() {} lSwcL
public synchronized void executeUpdate(){ o{:xp r=(
Connection conn=null; G3i !PwW
PreparedStatement ps=null; 4u;9J*r4
try{ yay<GP?
conn = DBUtils.getConnection(); 8IQtz2
conn.setAutoCommit(false); bUwn}_7b
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); g=L]S-e
for(int i=0;i<CountCache.list.size();i++){ 56lCwXCgA
CountBean cb=(CountBean)CountCache.list.getFirst(); YY((#"o;l
CountCache.list.removeFirst(); D/y bFk
ps.setInt(1, cb.getCountId()); hwYQGtjF
ps.executeUpdate();⑴ H6*^Ga
//ps.addBatch();⑵ H`hnEOyLp
} xM >W2
//int [] counts = ps.executeBatch();⑶ ZUm?*.g\^
conn.commit(); \>. LW9
}catch(Exception e){ 1/+C5Bp*
e.printStackTrace(); }|OaL*|u
} finally{ >SF Uy\3
try{ =ac_,]z
if(ps!=null) { tC?=E#3V
ps.clearParameters(); 82{ Vc
ps.close(); 5|0,X<&
ps=null; MM_k
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} 7cP@jj
}catch(SQLException e){} <*ZJaBwWU~
DBUtils.closeConnection(conn); 4rT*tW"U
} `3H4Ajzcc
} M-L2w"
public long getLast(){ 'VyM{:8
return lastExecuteTime; Bs+(L [Z
} *K!|@h{60
public void run(){ "I?Am&>'
long now = System.currentTimeMillis(); xJ^>pg8
if ((now - lastExecuteTime) > executeSep) { {^mNJ
//System.out.print("lastExecuteTime:"+lastExecuteTime); fqX"Lus `=
//System.out.print(" now:"+now+"\n"); Y?CCD4"qn
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); OMhef,,H
lastExecuteTime=now; f0<hE2
executeUpdate(); w\54j)rb
} 0N[&3Ee8
else{ mpAR7AG6
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {2/LRPT
} 3~,d+P
} PWh^[Rd)
} #_lt~^6
//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 i|w8.}0
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类写好了,下面是在JSP中如下调用。 S)QAXjH
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<% rg0ma
CountBean cb=new CountBean(); LmlXMia
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); QK0h6CX
CountCache.add(cb); }I3gU
out.print(CountCache.list.size()+"<br>"); #-pc}Y|<
CountControl c=new CountControl(); mRB
c.run(); JnHo 9K2.
out.print(CountCache.list.size()+"<br>"); CkJCi
%>