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: ~c `l@:
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CountBean.java n:!_
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/* ~]2K^bh8&
* CountData.java 5rik7a)Z]
* ?e 4/p
* Created on 2007年1月1日, 下午4:44 YaqJ,"GlT
* 7kEn \
* To change this template, choose Tools | Options and locate the template under \4fQMG
* the Source Creation and Management node. Right-click the template and choose c^W)07-X5y
* Open. You can then make changes to the template in the Source Editor. rey!{3U
*/ =aW9L)8D
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package com.tot.count; Km$\:Xo
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/** Dlvz)
* s$j,9uRr
* @author |+9&rAg
*/ dy[X3jQB
public class CountBean { :V||c 5B+
private String countType; d2$IH#~9B
int countId; OneY_<*a<
/** Creates a new instance of CountData */ D&y7-/
public CountBean() {} K}Qa~_
public void setCountType(String countTypes){ vFmZ<C'
)
this.countType=countTypes; 3bI9Zt#J%&
} es7=%!0
public void setCountId(int countIds){ &oMh]Z*:
this.countId=countIds; "w<#^d_6
} R:qW;n%AF
public String getCountType(){ ZN0P:==
return countType; (E1~H0^
} |FRg\#kf%
public int getCountId(){ [nq@m c~<
return countId; v]UwJz3<
} (ToUgVW1N
} xAm6BB
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CountCache.java $F.a><1rY
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/* #RLt^$!H
* CountCache.java J{G?-+`
* C0Z=~Q%
* Created on 2007年1月1日, 下午5:01 >vsqG=x
* _+MJ%'>S
* To change this template, choose Tools | Options and locate the template under GM<9p_
B
* the Source Creation and Management node. Right-click the template and choose _Fg5A7or
* Open. You can then make changes to the template in the Source Editor. Y'X%Aw;`
*/ T)_hpt.
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package com.tot.count; |R:'\+E
import java.util.*; wMN]~|z>
/** _aeBauD
* COlaD"Y
* @author 'J|_2*
*/ MolgwVd
public class CountCache { 6Kz,{F@
public static LinkedList list=new LinkedList(); x,'!gT:j
/** Creates a new instance of CountCache */ u ^RxD^=L
public CountCache() {} LDa1X2N
public static void add(CountBean cb){ GC'O[q+
if(cb!=null){ j'K/22
list.add(cb); Ax}JLPz5'
} `Q,H|hp;k;
} X}0cCdW
} k9F=8q
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CountControl.java Eh4=ZEX
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/* d/@,@8:
* CountThread.java <OPArht
* <#HYqR',
* Created on 2007年1月1日, 下午4:57 ySI!d|_
* /qw.p#
* To change this template, choose Tools | Options and locate the template under PPsE${!
* the Source Creation and Management node. Right-click the template and choose \l3h0R
* Open. You can then make changes to the template in the Source Editor. m#p'iU*va,
*/ T51
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package com.tot.count; #X"@<l4F
import tot.db.DBUtils; kG*~|ma
import java.sql.*; fF kj+
/** |wj?ed$
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* 8dhUBJ0_
* @author v &+R^iLE
*/ i}?>g -(
public class CountControl{ QmIBaMI#
private static long lastExecuteTime=0;//上次更新时间 1BEHw?dLU
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 U/BR*Zn]*
/** Creates a new instance of CountThread */ Tm?# M&'
public CountControl() {} {(}By/_
public synchronized void executeUpdate(){ Y <qm{e
Connection conn=null; 9_s`{(0?
PreparedStatement ps=null; ?bu>r=oIO]
try{ F6dP,(
conn = DBUtils.getConnection(); :Ux_qB
conn.setAutoCommit(false); HpnWoDM
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Z%\,w(o[h
for(int i=0;i<CountCache.list.size();i++){ GPkpXVm
CountBean cb=(CountBean)CountCache.list.getFirst(); fikkY=
CountCache.list.removeFirst(); 40
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ps.setInt(1, cb.getCountId()); v.5+7,4
ps.executeUpdate();⑴ YK~%x o
//ps.addBatch();⑵ 1-QS~)+
} EJ@ ~/)<
//int [] counts = ps.executeBatch();⑶ ~PNub E
conn.commit(); W@!S%Y9
}catch(Exception e){ ;9g2?-svw
e.printStackTrace(); OZ!^ak
} finally{ 4E?Oky#}-
try{ 3f;>" P}
if(ps!=null) { S21,VpW\
ps.clearParameters(); t0?\l)
ps.close(); POR\e|hRT]
ps=null; ~e.L.,4QZ8
} #R
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}catch(SQLException e){} 7=, ; h
DBUtils.closeConnection(conn); lb1Xsgm{
} 2f_:v6
} s"?3]P
public long getLast(){ b>9>uC@J15
return lastExecuteTime; }:#P)8/v>%
} =mmWl9'mJ
public void run(){ b<u3 hln%,
long now = System.currentTimeMillis(); HUO j0T
if ((now - lastExecuteTime) > executeSep) { B?o7e<l[
//System.out.print("lastExecuteTime:"+lastExecuteTime); #cLBQJq
//System.out.print(" now:"+now+"\n"); N)>ID(}F1
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); +d-NL?c
lastExecuteTime=now; yR.Ong
executeUpdate(); 76` .Y
} L4?IHNB
else{ ei5~&
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); n?K
} YT8F#t8
} c6/=Gq{.
} sUm'
//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 W+1^4::+
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类写好了,下面是在JSP中如下调用。 FU<Jp3<%
t );/'3|
<% kz7(Z'pw
CountBean cb=new CountBean(); 0Fr?^3h
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Oz#{S:24M+
CountCache.add(cb); *k>n<p3dd
out.print(CountCache.list.size()+"<br>"); Q)z8PQl O
CountControl c=new CountControl(); BDZ?Ez\Sg
c.run(); xi;`ecqS<
out.print(CountCache.list.size()+"<br>"); RY*U"G0#w
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