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: *tgu@9b
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CountBean.java QXN_ ?E,g/
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/* &N._}ts
* CountData.java JWI Y0iP
* _OyQ:>M6P
* Created on 2007年1月1日, 下午4:44 0Q`v#$?":
* oLh ,F"nB
* To change this template, choose Tools | Options and locate the template under 8-B7_GoJ+B
* the Source Creation and Management node. Right-click the template and choose ;o9ixmT<-o
* Open. You can then make changes to the template in the Source Editor. \~"Ub"~I
*/ v"W*@7<`S
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package com.tot.count; T7^;!;i`X
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/** <|jh3Hlp
* t>/x-{bH\
* @author )*>wa%[-q
*/ cw{TS
public class CountBean { \yC /OLXq
private String countType; 0o"aSCq8t
int countId; #79[Qtkrhm
/** Creates a new instance of CountData */ &29jg_'W
public CountBean() {} | @$I<
public void setCountType(String countTypes){ ao"2kqa)r
this.countType=countTypes; 6Eu(C]nC(
} >ItT269G
public void setCountId(int countIds){ )38%E;T{X
this.countId=countIds; (u} /(Ux
} FV/t
public String getCountType(){ &UOxS W
return countType; .8u@/f%pV
} #Uu,yHMv:;
public int getCountId(){ W>C?a=r~
return countId; YnRO>`
} dN)8r
} T7.Iqw3p
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CountCache.java XhHgXVVGG<
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/* R`Z"ey@C
* CountCache.java }!oEjcX'
* .i
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* Created on 2007年1月1日, 下午5:01 b4i=%]v8
* hdHz", )
* To change this template, choose Tools | Options and locate the template under 1o%#kf
* the Source Creation and Management node. Right-click the template and choose 45sEhs[$
* Open. You can then make changes to the template in the Source Editor. CqlxE/|
*/ Y?NL|cW4
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package com.tot.count; =g9n =spAn
import java.util.*; WSu6chz)
/** kpIn_Ea
* ]690ey$E:j
* @author (.cA'f?h
*/ r|u[36NmA
public class CountCache { .Y;f9R
public static LinkedList list=new LinkedList(); _ZK^JS
/** Creates a new instance of CountCache */ N*}soMPV^.
public CountCache() {} JM|HnyI
public static void add(CountBean cb){ jJ$B^Y"4
if(cb!=null){ !SW0iq[7j
list.add(cb); QQ .?A(U7
} \ +%~7Bi]z
} ~p?ArZb
} XNWtX-[^@
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CountControl.java ~3?-l/ $
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/* !q\=e@j-i
* CountThread.java f?Zjd&|Ch
* p{^:b6
* Created on 2007年1月1日, 下午4:57 4 k<o
* +ig%_QED[\
* To change this template, choose Tools | Options and locate the template under Lc{arhN
* the Source Creation and Management node. Right-click the template and choose @"MYq#2c$
* Open. You can then make changes to the template in the Source Editor. r6Yd"~ n
*/ ly17FLJ].
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package com.tot.count; FT-.gi0
import tot.db.DBUtils; )bOfs*S
import java.sql.*; GHcx@||C?
/** z_$c_J
* g2|Myz)
* @author 5p[}<I{
*/ QPDh!A3T
public class CountControl{ "kyCY9)%
private static long lastExecuteTime=0;//上次更新时间 wS*r<zj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 #XDgvX >
/** Creates a new instance of CountThread */ q>2bkc GY#
public CountControl() {} Z)`)9]*
public synchronized void executeUpdate(){ Kq3c Kp4
Connection conn=null; &L+uu',M0c
PreparedStatement ps=null; = UH3.
try{ [ ulub|
conn = DBUtils.getConnection(); <b zzbR[F
conn.setAutoCommit(false); lLTqk\8g
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); e
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for(int i=0;i<CountCache.list.size();i++){ 4|`>}Nu
CountBean cb=(CountBean)CountCache.list.getFirst(); +twoUn{#
CountCache.list.removeFirst(); ?7aZU
ps.setInt(1, cb.getCountId()); U"k$qZ[
ps.executeUpdate();⑴ -+rzc&h
//ps.addBatch();⑵ E{|B&6$[}
} H`CID*Ji
//int [] counts = ps.executeBatch();⑶ V%oZT>T3
conn.commit(); 0hemXvv1
}catch(Exception e){ 90<g=B
e.printStackTrace(); {-\U)&6#v
} finally{ )R JEOl1
try{ t>\sP
if(ps!=null) { a_>|Ny6{
ps.clearParameters(); ^<CVQ8R7
ps.close(); `pfIgryns
ps=null; 7&ED>Bk
} @Dh2@2`>
}catch(SQLException e){} '>"{yi-
DBUtils.closeConnection(conn); /sA&}kX}E
} UY<