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: e
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CountBean.java oP7)
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/* 0ZD)(ps|
* CountData.java =<(6yu_
* `v(!IBP|
* Created on 2007年1月1日, 下午4:44 :zIB3nT^
* m bhh
* To change this template, choose Tools | Options and locate the template under |w~*p
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* the Source Creation and Management node. Right-click the template and choose ,3GB9
* Open. You can then make changes to the template in the Source Editor. oKkDG|IE
*/ dJQwb
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package com.tot.count; 0"\js:-$
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/** Ug#B( }/
* ;\13x][
* @author T{3-H(-gA
*/ ] -C*d$z
public class CountBean { Ea" -n9
private String countType; 1'&HmBfcb
int countId; B&!>& Rbx
/** Creates a new instance of CountData */ #Wl9[W/4
public CountBean() {} ~r})&`5
public void setCountType(String countTypes){ y9i+EV
this.countType=countTypes; Y!c7P,cZ+3
} `}
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public void setCountId(int countIds){ FFVh~em{
this.countId=countIds; Xa'b@*o&
} LChwHkRHJI
public String getCountType(){ =`MQKh,
return countType; r<dvo%I#|
} ~}D"8[ABj
public int getCountId(){ W^,p2
return countId; Ly`.~t(~l
} _w <6o<@
} w2!5TKZ`
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CountCache.java BG-nf1K(
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/* QUXr#!rPY|
* CountCache.java ?ODBW/{[G
* M@. 2b.
* Created on 2007年1月1日, 下午5:01 ygV-Fv>PQ
* S[/D._5QD%
* To change this template, choose Tools | Options and locate the template under DoeE=X*`k
* the Source Creation and Management node. Right-click the template and choose <c(%xh46
* Open. You can then make changes to the template in the Source Editor. 1TN+pmc}@
*/ >Zm|R|{BE
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package com.tot.count; k^UrFl
import java.util.*; 2mthUq9b*
/** Hb$wawy<
* ,/p.!+
* @author >O1u![9K|w
*/ .,p@ee$q
public class CountCache { RBeQT=B8~
public static LinkedList list=new LinkedList(); D0gz
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/** Creates a new instance of CountCache */ do< N+iK
public CountCache() {} Jj1lAg0
public static void add(CountBean cb){ Io7=Mc4
if(cb!=null){ `GooSX
list.add(cb); mFC9\
} <;Td8T;
} ,UT :wpc^i
} i@YM{FycX
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CountControl.java
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/* `C*psS
* CountThread.java \xk8+= /A
* 3=lQZi<]%
* Created on 2007年1月1日, 下午4:57 cn$0^7?
* @7Nc*-SM
* To change this template, choose Tools | Options and locate the template under 'yAHB* rQR
* the Source Creation and Management node. Right-click the template and choose Ve\!:,(Y_
* Open. You can then make changes to the template in the Source Editor. v`"BXSmp{
*/ <3{>;^|e
#|cr\\2*
package com.tot.count; G'_5UP!
import tot.db.DBUtils; s(Fxi|v;
import java.sql.*; S#ud<=@!9
/** 1u~.^O}J
* {*qz<U>
* @author HqA~q
*/ BMbZ34^e
public class CountControl{ `uqsYY`V
private static long lastExecuteTime=0;//上次更新时间 HO8x:2m
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 kkV*#IZ
/** Creates a new instance of CountThread */ Z9I
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public CountControl() {} .|J-(J<>[.
public synchronized void executeUpdate(){ vau#?U".}>
Connection conn=null; 4g/Ly8
PreparedStatement ps=null; lJ4&kF=t
try{ 3)~z~p7
conn = DBUtils.getConnection(); 3%V VG~[
conn.setAutoCommit(false); j2!^iGS}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); z]Mu8
for(int i=0;i<CountCache.list.size();i++){ EDGAaN*Q
CountBean cb=(CountBean)CountCache.list.getFirst(); p~t5PU*(
CountCache.list.removeFirst(); +JBYGYN&K
ps.setInt(1, cb.getCountId()); b@N*W]
ps.executeUpdate();⑴ bdyE9t
//ps.addBatch();⑵ @1peJJ{
} [JX=<a)U
//int [] counts = ps.executeBatch();⑶ *| YR8f
conn.commit(); 'y:+w{I2o
}catch(Exception e){ @arMg2"o
e.printStackTrace(); X$$b :q
} finally{ sJ cwN.s
try{ v>p~y u+G
if(ps!=null) { x;>~;vmi
ps.clearParameters(); E{Y)=tW[
ps.close(); U3ao:2zP
ps=null; ]`n6H[6O
} ~f!iz~
}catch(SQLException e){} R`emI7|
DBUtils.closeConnection(conn); DWar3+u&0
} f5|Ew&1EP
} 1ml{oqNj
public long getLast(){ `n`aA)|<
return lastExecuteTime; ef(OhIX
} @D&}ZV=J
public void run(){ ePwoza
long now = System.currentTimeMillis(); ]bb`6 \h
if ((now - lastExecuteTime) > executeSep) { Ft$tL;
//System.out.print("lastExecuteTime:"+lastExecuteTime); ;Quk%6;[N
//System.out.print(" now:"+now+"\n"); y@Ga9bI7
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); km#Rh^
lastExecuteTime=now; oSqkAAGz\
executeUpdate(); 79Si^n1\
} tm280
else{ o;Ma)/P
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 9"mcN3x:\e
} LIDYKKDJ^
} hNJubTSE+)
} ob;$yn7ZO1
//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 6(.]TEu0
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类写好了,下面是在JSP中如下调用。 Rd{#cW~
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<% =WP`i29j9}
CountBean cb=new CountBean(); vL:tuEE3
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); h$y0>eMWs
CountCache.add(cb); 4^rO K
out.print(CountCache.list.size()+"<br>"); J$Nc9?|ZZ
CountControl c=new CountControl(); 7|eD}=jy
c.run(); 1k! xG$g0
out.print(CountCache.list.size()+"<br>"); jZvQMW
%>