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: Cid
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CountBean.java 1aTB%F
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/* L'kmNVvYN
* CountData.java P ! _rEV
*
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* Created on 2007年1月1日, 下午4:44 =z
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* @!1x7%]G
* To change this template, choose Tools | Options and locate the template under 8#g1P4
* the Source Creation and Management node. Right-click the template and choose - RU=z!{
* Open. You can then make changes to the template in the Source Editor. ruld B,n
*/ KGFv"u{
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package com.tot.count; ~5oPpTAe
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/** gp\<p-}
* .~7FyLl$
* @author N=7pK&NHSG
*/ k-^mIJo}
public class CountBean { &*aIEa^
private String countType; 6g)GY"49
int countId; ,JQp'e
/** Creates a new instance of CountData */ V]db'qB\
public CountBean() {} VB*oGG
public void setCountType(String countTypes){ ?snp8W-WB
this.countType=countTypes; 4v{o
} Ob<{G"
public void setCountId(int countIds){ Iepsz
this.countId=countIds; jJPGrkr
} 4.5|2\[
public String getCountType(){ ~S,,w1`
return countType; Rw0qcM\>|
} |3KLk ?2
public int getCountId(){ ^0\
return countId; ?m\t|/0Q
} aq@8"b(.
} '?p<lu^^B
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CountCache.java $cU!m(SILQ
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/* 5lUF7:A>#
* CountCache.java %#xaA'?
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* Created on 2007年1月1日, 下午5:01 9~/J35
* v: OR
* To change this template, choose Tools | Options and locate the template under /^#;d
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* the Source Creation and Management node. Right-click the template and choose {C N~S*m
* Open. You can then make changes to the template in the Source Editor. '$ t
*/ I!Z_[M
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package com.tot.count; U ^5Kz-5.
import java.util.*; _ =VqrK7T
/** A"dR{8&0
* LoN< oj5
* @author hFy;ffs.
*/ DrY:9[LP
public class CountCache { ^Dn D>h@q
public static LinkedList list=new LinkedList();
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/** Creates a new instance of CountCache */ [R^iF
public CountCache() {} Ay0U=#XP
public static void add(CountBean cb){ WGZ9B^A
if(cb!=null){ jYmR
list.add(cb); %|q>pin2
} sl`s_$J
} ~ls[Sl@
} os:A]
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CountControl.java S]Mw#O|
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/*
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* CountThread.java 9Hb6nm
* 'O_3)x5
* Created on 2007年1月1日, 下午4:57 !C3MFm{B
* |es?;s'
* To change this template, choose Tools | Options and locate the template under #(N+(():
* the Source Creation and Management node. Right-click the template and choose zkuU5O
* Open. You can then make changes to the template in the Source Editor. .yqM7U_
*/ f=r<nb'H
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package com.tot.count; R\G0'?h
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import tot.db.DBUtils; pm
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import java.sql.*; YA_c
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/** g+Sbl
* <oT^ A|JFj
* @author %^4CSh
*/ aJbO((%$|u
public class CountControl{ 8m\7*l^D:
private static long lastExecuteTime=0;//上次更新时间 0uOkMuy<
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V)~.~2$
/** Creates a new instance of CountThread */ QSdHm
public CountControl() {} v4`"1Ss,K
public synchronized void executeUpdate(){ (3Two}
Connection conn=null; .*Ct bGw
PreparedStatement ps=null; $j5K8Ad
try{ :OhHb#D
conn = DBUtils.getConnection(); ^6MU
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conn.setAutoCommit(false); e478U$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >>t@}F)
for(int i=0;i<CountCache.list.size();i++){ `(ue63AZ
CountBean cb=(CountBean)CountCache.list.getFirst(); ~obqG!2m
CountCache.list.removeFirst(); "$+Jnc!!
ps.setInt(1, cb.getCountId()); 7vrl'^ 1
ps.executeUpdate();⑴ |Mup8(gCk
//ps.addBatch();⑵ =S+wCN
} ;o2$
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//int [] counts = ps.executeBatch();⑶ IEsEdw]aZE
conn.commit(); M/>7pZW
}catch(Exception e){ P2BWuhF
e.printStackTrace(); jjw`Dto&
} finally{ }@'$b<!B
try{ F;4vPbH+
if(ps!=null) { )U7t
ps.clearParameters(); a!7A_q8M
ps.close(); dJeNbVd
ps=null; ~J wb`g.
} RKHyw08
}catch(SQLException e){} (2J: #
DBUtils.closeConnection(conn); c'>/
} f_jo+z{-ik
} \E72L5nJW
public long getLast(){ PV'x+bN5
return lastExecuteTime; |:nOp(A\*
} m? J0i>H
public void run(){ 4o
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long now = System.currentTimeMillis(); LrM=*Rh,O
if ((now - lastExecuteTime) > executeSep) { DCIxRPw
//System.out.print("lastExecuteTime:"+lastExecuteTime); (C-{B[Y
//System.out.print(" now:"+now+"\n"); jnK WZ/R
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); y&q*maa[
lastExecuteTime=now; Fq~yL!#!
executeUpdate(); m ZtCL
} #%iDT6
else{ vj'wm}/
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); : UGZ+
} s C%&cRQD
} 42_`+Vt]d7
} ;f0I
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//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 D/Z6C&/I
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类写好了,下面是在JSP中如下调用。 X^}I-M%{m
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<% @r/#-?W
CountBean cb=new CountBean(); jVv0ST*z
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ieDk ;
CountCache.add(cb); m[?E
out.print(CountCache.list.size()+"<br>"); |oH,
CountControl c=new CountControl(); #%a;"w
c.run(); N..yQ-6x?
out.print(CountCache.list.size()+"<br>"); &zl|87M
%>