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: Gy"%R-j7
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CountBean.java B_^]C9C|
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/* UiQEJXwnz
* CountData.java nJZ6?
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* nFM@@oA
* Created on 2007年1月1日, 下午4:44 Ne6}oQy(S`
* DN8}glVxV
* To change this template, choose Tools | Options and locate the template under ~i0R^qfr
* the Source Creation and Management node. Right-click the template and choose / T
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* Open. You can then make changes to the template in the Source Editor. #VGjCEeU
*/ b]Z@^<_E
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package com.tot.count; @;Opx."
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/** e8P-k3a"5:
* .Zmp ,
* @author \7v)iG|#G&
*/ QM<y`cZ8
public class CountBean { .Y*f2A.v
private String countType; aP-<4uGx
int countId; S*
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/** Creates a new instance of CountData */ kH948<fk3
public CountBean() {} 9X}I>
public void setCountType(String countTypes){ G"dS+,Q
this.countType=countTypes; OJO!FH)
} SOf{Hx0C6
public void setCountId(int countIds){ GK*v{`
this.countId=countIds; y9l*m~
} O4iC]5@
public String getCountType(){ sLL7]m}
return countType; /JJw 6[N
} T7*wS#z)h
public int getCountId(){ !#yq@2QX
return countId; ~I=Y{iM
} O(Jj|Z
} tt_o$D~kg
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CountCache.java -yAQ
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/* s)J(/
* CountCache.java #qBr/+b
*
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* Created on 2007年1月1日, 下午5:01 p#P~Q/;
* v Gy8Qu>
* To change this template, choose Tools | Options and locate the template under i[jJafAcN
* the Source Creation and Management node. Right-click the template and choose XXZaKgsq
* Open. You can then make changes to the template in the Source Editor. U(>4s]O6
*/ ,:Z^$
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package com.tot.count; 3VO2,PCZ
import java.util.*; G6 0S|d
/** YwEpy(}hJm
* fxcc<h4
* @author yay<GP?
*/ YZf6|
public class CountCache { o{qr!*_3
public static LinkedList list=new LinkedList(); [Nm4sI11
/** Creates a new instance of CountCache */ Sjj>#}U
public CountCache() {} "/Pjjb:2
public static void add(CountBean cb){ =T?}Nt
if(cb!=null){ :M3oUE{
list.add(cb); -Apc$0ZsN
} }L=/A7Nk>
} {7hLsK[])
} sic"pn],U
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CountControl.java Ws U)Y&
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/*
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* CountThread.java n.MRz WJpZ
* gmKGy@]
* Created on 2007年1月1日, 下午4:57 S0,R_d')
* nQX+pkJ
* To change this template, choose Tools | Options and locate the template under Cwa^"r3P1
* the Source Creation and Management node. Right-click the template and choose (& "su3z
* Open. You can then make changes to the template in the Source Editor. hXIro
*/ HAz By\M{
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package com.tot.count; 3rW|kkn
import tot.db.DBUtils; 6 gL=u-2
import java.sql.*; Rk<@?(l!6x
/** |~`as(@Ih
* +d}E&=p_
* @author kl!wVLE
*/ O|IG_RL]
public class CountControl{ BF*kb2"GZ6
private static long lastExecuteTime=0;//上次更新时间 \uqjs+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 tsOrt3
/** Creates a new instance of CountThread */ 5@IB39
public CountControl() {} 1J=.N|(@Q
public synchronized void executeUpdate(){ w27KI]%(
Connection conn=null; }U ~6^2 .,
PreparedStatement ps=null; wcSyw2D
try{ }0#U;_;D
conn = DBUtils.getConnection(); h`
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conn.setAutoCommit(false); - O98pi
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); NL=|z=q
for(int i=0;i<CountCache.list.size();i++){ C
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CountBean cb=(CountBean)CountCache.list.getFirst(); Mv544>:
CountCache.list.removeFirst(); EC2+`HJ"
ps.setInt(1, cb.getCountId()); GcIDG`RX
ps.executeUpdate();⑴ \6n!3FLl
//ps.addBatch();⑵ ZX!r1*c
6
} 6oaazB^L
//int [] counts = ps.executeBatch();⑶ h!~3Dw>,N
conn.commit(); d<!3`qe
}catch(Exception e){ 3`d}~v{
e.printStackTrace(); ptatzp]c#
} finally{ 5Wyz=+?m|
try{ 6vuq1
if(ps!=null) { [Aj Q#;#Q
ps.clearParameters(); LZJA4?C
ps.close(); N7'OPTKt&
ps=null; Ds#/
} kIw`P[
}catch(SQLException e){} )[H{yQ
DBUtils.closeConnection(conn); OaJB=J%
} ;AR{@Fu.
} ~\ ,w {
public long getLast(){ WV3|?,y]qm
return lastExecuteTime; F|Mi{5G%
} ZUz ^!d
public void run(){ v(*C%.M)
long now = System.currentTimeMillis(); 9CA^B2u
if ((now - lastExecuteTime) > executeSep) { f.aSKQD
//System.out.print("lastExecuteTime:"+lastExecuteTime); q{s(.Uq$&
//System.out.print(" now:"+now+"\n"); I}e3zf>
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); i|w8.}0
lastExecuteTime=now; !CXt*/~
executeUpdate(); ]2#
} bfB\h*XO
else{ NaVQ9ku7VW
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); F(4?tX T
} ,fK3ZC
} "|;:>{JC
} lzw3= H
//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 ,NnhHb2\
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类写好了,下面是在JSP中如下调用。 +iRq8aS_
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<% A+y
CountBean cb=new CountBean(); JdIlWJY
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); CTWn2tpW
CountCache.add(cb); h\plQ[T
out.print(CountCache.list.size()+"<br>"); 8N:owK
CountControl c=new CountControl(); &_JD)mM5
c.run(); 4}_O`Uxh
out.print(CountCache.list.size()+"<br>"); Gl1jxxd
%>