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: ^w ]1qjGw
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CountBean.java Y~}QJ+`?
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/* S So~.)J
* CountData.java xBt4~q;#sE
* xg4T` ])
* Created on 2007年1月1日, 下午4:44 }$&);7(w
* )OS>9
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* To change this template, choose Tools | Options and locate the template under .Lp Nm'=R
* the Source Creation and Management node. Right-click the template and choose d"Ml^rAn
* Open. You can then make changes to the template in the Source Editor. )62q|c9F
*/ eF*TLI<[^I
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package com.tot.count; }b<87#Nb9R
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/** yg.\^C
* K7y!s :rg!
* @author qb
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*/ yDDghW'\WU
public class CountBean { dW:w<{a!R
private String countType; T;xHIg4
int countId; f45;fT>
/** Creates a new instance of CountData */ &8o :
public CountBean() {} |q9,,i}!
public void setCountType(String countTypes){ b"*mi
this.countType=countTypes; o
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} -(|7`U
public void setCountId(int countIds){ Qj{$dqmDN
this.countId=countIds; `mh-pBVD1
} Q;d+]xj
public String getCountType(){ H,01o5J
return countType; j
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} ]wJ}-#Kx
public int getCountId(){ ZJ)3GF}4
return countId; wCTcGsw W
} )<m=YI
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} ~t1O]aO(
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CountCache.java V7Vbl?*n
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/* &zaW"uy3T
* CountCache.java
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* ~pDRF(
* Created on 2007年1月1日, 下午5:01 m1M;'tT@
* u-]vK
* To change this template, choose Tools | Options and locate the template under g!~-^_F
* the Source Creation and Management node. Right-click the template and choose .eZPp~[lAN
* Open. You can then make changes to the template in the Source Editor. d"QM;9
*/ 2D\x-!l/
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package com.tot.count; JMl, N
import java.util.*; S&gKgQD"Q
/** wliGds
* EIy]qAE:f
* @author 35-DnTv
*/ H-nFsJ(R!c
public class CountCache { ^!-E`<jW8
public static LinkedList list=new LinkedList(); tU-#pB>H
/** Creates a new instance of CountCache */ %N?W]vbra
public CountCache() {} 'b?#4rq}
public static void add(CountBean cb){ %Q>~7P
if(cb!=null){ Q>06dO~z8
list.add(cb); JI{OGr
} E.En$'BvB
}
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} ySPlyhGF
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CountControl.java 24.7S LXO
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/* UpE1PLZlB
* CountThread.java P22y5z~
* '? !7 Be
* Created on 2007年1月1日, 下午4:57 +S:u[x
* dvrvpDoE.
* To change this template, choose Tools | Options and locate the template under 5Xq.=/eX
* the Source Creation and Management node. Right-click the template and choose 8k*
* Open. You can then make changes to the template in the Source Editor. hSLwiX~
*/ 9~Y)wz
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package com.tot.count; ` maN5)
import tot.db.DBUtils; Y3sNr)qss
import java.sql.*; etQx>U
/** )f:!#v(K
* CguU+8]
* @author
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*/ OoU '86)
public class CountControl{ OLd$oxKR
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 h!X'SGK
/** Creates a new instance of CountThread */ ->RF`SQu
public CountControl() {} nEZ-h7lzl(
public synchronized void executeUpdate(){ q:D0$YY0
Connection conn=null; o q'J*6r
PreparedStatement ps=null; 5Qm.ECXV
try{ y:^>(l #;
conn = DBUtils.getConnection(); GakmROZ@9
conn.setAutoCommit(false); qQ?,|4)y
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); *BP\6"X
for(int i=0;i<CountCache.list.size();i++){ 1z$}*`
CountBean cb=(CountBean)CountCache.list.getFirst(); u\Erta`
CountCache.list.removeFirst(); 2+r )VF:
ps.setInt(1, cb.getCountId()); EnsNO_"e|
ps.executeUpdate();⑴ @poMK:
//ps.addBatch();⑵ 4BUK5)B
} iJynR [7
//int [] counts = ps.executeBatch();⑶ ,&pF:qlF
conn.commit(); Pvb+
}catch(Exception e){ 2)j#O
e.printStackTrace(); ^r?sgJ
} finally{ ]Pg?(lr6)
try{ ,~=z_G`R
if(ps!=null) { 9<0$mE^:
ps.clearParameters(); V+"*A
ps.close(); GQ8Dj!8
ps=null; Sv^'CpQ
} Pc\4QvQ8
}catch(SQLException e){} _UVX
DBUtils.closeConnection(conn); |
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} C\hZ;Z1
} k0Vo
public long getLast(){ LBiv]3
return lastExecuteTime; zLIa! -C
} MWd_6XM
public void run(){ TckR_0LNV
long now = System.currentTimeMillis(); >TJKH^7n
if ((now - lastExecuteTime) > executeSep) { QWQ6j#`
//System.out.print("lastExecuteTime:"+lastExecuteTime); .of:#~
//System.out.print(" now:"+now+"\n"); { P\8g8
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Wp~4[f`,
lastExecuteTime=now; #t9=qR~"
executeUpdate(); LZAj4|~,m
} 4Xb}I;rM
else{ uD*s^
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); S5[RSAbf*t
} 1 0Tg> H
} Z?j='/u>@
} Ok{:QA~#
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 JV6U0$g_S
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类写好了,下面是在JSP中如下调用。 JgjL$n;F
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<% (R|FQdH
CountBean cb=new CountBean(); f8_UIdM7
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); .)pRB7O3
CountCache.add(cb); uJ5%JB("E
out.print(CountCache.list.size()+"<br>"); `/j|Rb|eow
CountControl c=new CountControl(); GWE0 UO}
c.run();
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out.print(CountCache.list.size()+"<br>"); [ BC%$Sj
%>