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: Fhllqh)
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CountBean.java Hmm0H6&u
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/* !%}n9vr!}\
* CountData.java o:cTc:l)
* @,= pG
* Created on 2007年1月1日, 下午4:44 ,J+L_S+B~
* 9XQE5^
* To change this template, choose Tools | Options and locate the template under bJ
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* the Source Creation and Management node. Right-click the template and choose 6&'kN2
* Open. You can then make changes to the template in the Source Editor. P-[})Z=
*/ !pRu?5
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package com.tot.count; NTX0vQG
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/** iex%$> "
* h*y+qk-!\g
* @author "3]}V=L<5
*/
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public class CountBean { #r"|%nOfY
private String countType; u/|@iWK:
int countId; !hfpa_5
/** Creates a new instance of CountData */ NBasf
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public CountBean() {} /'.gZo
public void setCountType(String countTypes){ '?m2|9~
this.countType=countTypes; ipMSMk7gx
} ^1c7\"{
public void setCountId(int countIds){ RFS}!_t+|
this.countId=countIds; aqk$4IG
} 6~ y'
public String getCountType(){ KC; o
return countType; Wk3-J&QbS
} 2brY\c
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public int getCountId(){ r{d@74
return countId; h*JN0O<b
} W3Ee3
} S9$,.aq
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CountCache.java j+-`P5
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/* Y~I>mc]
* CountCache.java 1Zp/EYWa{
* E <j=5|0t
* Created on 2007年1月1日, 下午5:01 6J JA"] `
* :ln|n6X
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose 2uT6M%OC
* Open. You can then make changes to the template in the Source Editor. ]smu~t0\
*/ ;xw9#.d#D
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package com.tot.count; (ot56`,k
import java.util.*; (t&`m[>K
/** gn/]1NNfR
* O^./)#!#
* @author SfPQ;s'
*/ , vvfk=-
public class CountCache { !wd
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public static LinkedList list=new LinkedList(); wDoCc:
/** Creates a new instance of CountCache */ (t5y$bc
public CountCache() {} }yrs6pQ
public static void add(CountBean cb){ zb[kRo&a0W
if(cb!=null){ g%]<sRl:-
list.add(cb); LzLJ6A>;R
} ]Z\ W%'q+
} l}-k>fug
} ,MJddbcg
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CountControl.java #
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/* .WN&]yr,
* CountThread.java |zfFB7}v
* y_W?7S
* Created on 2007年1月1日, 下午4:57 @VOegf+N
* NRG~ya >
* To change this template, choose Tools | Options and locate the template under ?xMTO
* the Source Creation and Management node. Right-click the template and choose 6ZI7V!k
* Open. You can then make changes to the template in the Source Editor. gU&+^e >
*/ 2<n18-|OQ
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package com.tot.count; &Q"vXs6Gt
import tot.db.DBUtils; Brs}
import java.sql.*; bvZD@F`2
/** Zp_j\B
* "#0P*3-c
* @author RWM~7^JA
*/ p}!)4EI=
public class CountControl{ 5 z3WRg
private static long lastExecuteTime=0;//上次更新时间 3HP
{
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _a"|
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/** Creates a new instance of CountThread */ 6K8v:yYPa
public CountControl() {} 6?US<<MQ
public synchronized void executeUpdate(){ Fq+Cr?-
Connection conn=null; $(0<T<\
PreparedStatement ps=null; n;xzjq-
try{ )q4nyT>M
conn = DBUtils.getConnection(); >a2[P"
conn.setAutoCommit(false); ,*lns.|n
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); U{lf$
for(int i=0;i<CountCache.list.size();i++){ `aX+Gz?
CountBean cb=(CountBean)CountCache.list.getFirst(); RYC%;h
CountCache.list.removeFirst(); Ym]g0a
ps.setInt(1, cb.getCountId()); &e).l<B
ps.executeUpdate();⑴ buzpmRoN)
//ps.addBatch();⑵ 'CqAjlj
} RB""(<
//int [] counts = ps.executeBatch();⑶ r/ATZAgHP
conn.commit(); <)O#Y76s
}catch(Exception e){ q\!"FDOl4
e.printStackTrace(); tQ'R(H`
} finally{ KdHkX+-R
try{ }>y~P~`S:
if(ps!=null) { !(Y|Vm'
ps.clearParameters(); (?XIhpd
ps.close(); !7#*Wdt+P
ps=null; ]CS
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} u}R|q
}catch(SQLException e){} qa~ju\jm.
DBUtils.closeConnection(conn); /#_[{lSr?
} l1 08.ao
} r
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public long getLast(){ x?0(K=h,
return lastExecuteTime; p.4Sgeh#
} ^HP$r*
public void run(){ MGwXZ7?E
long now = System.currentTimeMillis(); t*BCpC}
if ((now - lastExecuteTime) > executeSep) { 30Q77,Nsny
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5$Kv%U
//System.out.print(" now:"+now+"\n"); .|L9}<
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 60>g{1]
lastExecuteTime=now; # vy[v22
executeUpdate(); ^5 "yY2}-
} ;Cx`RF
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else{ ~^Ga?Q_
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); n.5M6i/~a
} HH(2
} ],R\oMYy|P
} -2U|G
//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 )Rk(gd
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类写好了,下面是在JSP中如下调用。 Td^62D;
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<% "Gqas bX
CountBean cb=new CountBean(); *E|3Vy{4
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); l!j=em@
CountCache.add(cb); 7X$pgNRx/a
out.print(CountCache.list.size()+"<br>"); DBvozTsF~
CountControl c=new CountControl(); E){ODyk
c.run(); (]fbCH:
out.print(CountCache.list.size()+"<br>"); MbTmdRf
%>