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: =h|7bYLy
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CountBean.java /iJsa&W}
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/* T'9M
* CountData.java E^m)&.+'M
* ]\]mwvLT
* Created on 2007年1月1日, 下午4:44 _@VKWU$$
* i8DYC=r
* To change this template, choose Tools | Options and locate the template under 2wgcVQ
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* the Source Creation and Management node. Right-click the template and choose *Wcq'S
* Open. You can then make changes to the template in the Source Editor. dj}P|v/;z
*/ f#hmMa
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package com.tot.count; XhN?E-WywQ
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/** - s2Yhf
* Hq>rK`
* @author 4{b/Nv:b
*/ dEo r+5}
public class CountBean { 5d}bl{
private String countType; Tb*Q4:r"
int countId; rP/W,!
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/** Creates a new instance of CountData */ <l>L8{-3
public CountBean() {} 6)FM83zk)K
public void setCountType(String countTypes){ E~8J<gE
this.countType=countTypes; }VVtv1
} k9c`[M
public void setCountId(int countIds){ EJJ&`,q
this.countId=countIds; B74]hgK
} 5RY rAzQo
public String getCountType(){
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return countType; w"A>mEex<
} pvRa
public int getCountId(){ ^Nysx ~6
return countId; En0hjXa
} 'o7V6KG
} Xj:\B] v]
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CountCache.java 0f;|0siTAm
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/* ntZHO}'
* CountCache.java 4*UKR!sr
* uFOYyrESc
* Created on 2007年1月1日, 下午5:01 "2T* w~V&y
* 5)gC<
* To change this template, choose Tools | Options and locate the template under ZZ>(o
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* the Source Creation and Management node. Right-click the template and choose 'jKCAU5/0;
* Open. You can then make changes to the template in the Source Editor. VZ2CWE)t
*/ ,@Elw>^
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package com.tot.count; B<,AI7
import java.util.*; F5\{`
/** /)r[}C0
* ZrWA,~;
* @author i"{znKz vD
*/ Q*/jQC
public class CountCache { `QT9W-0e^
public static LinkedList list=new LinkedList(); IY|>'}UU#
/** Creates a new instance of CountCache */ @EH@_EwYV
public CountCache() {} @%6"xnb`
public static void add(CountBean cb){ r<"k
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if(cb!=null){ @$?*UI6y
list.add(cb); \Pd>$Q
} CW~c<,"
} @DyMq3Gt?&
} 8ya|eJ]/L
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CountControl.java F>5)Clq
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/* (KT+7j0^
* CountThread.java {CGk9g"`
* {)-3g~
* Created on 2007年1月1日, 下午4:57 >+*lG>!z
* ,h.hgyt
* To change this template, choose Tools | Options and locate the template under 37|EG
* the Source Creation and Management node. Right-click the template and choose (}CA?/
* Open. You can then make changes to the template in the Source Editor. [<#`@Kr
*/ h ?+vH{}j
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package com.tot.count; +kOXa^K
import tot.db.DBUtils; Q_|Lv&
import java.sql.*; IHe?/oUL"b
/** v79\(BX
* ^L's45&_
* @author n*N`].r#{=
*/ Qh4Z{c@
public class CountControl{ f`p"uLNo<
private static long lastExecuteTime=0;//上次更新时间 qApf\o3[0
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 .OD{^Kq2
/** Creates a new instance of CountThread */ NKRH>2,
public CountControl() {} 2;YL+v2
public synchronized void executeUpdate(){ q]m$%>
Connection conn=null; }zHG]k,j
PreparedStatement ps=null; 3F9AnS
try{ ^1[u'DW4
conn = DBUtils.getConnection(); `qj24ehc
conn.setAutoCommit(false); ~01Fp;L/
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 93y!x}
for(int i=0;i<CountCache.list.size();i++){ O@,9a~Ghd
CountBean cb=(CountBean)CountCache.list.getFirst(); 5=P*<Dnj
CountCache.list.removeFirst(); . AX6xc6
ps.setInt(1, cb.getCountId()); UQ+!P<>w
ps.executeUpdate();⑴ !o8(9F
//ps.addBatch();⑵ GhY MO6Q4
} IVSd,AR7yY
//int [] counts = ps.executeBatch();⑶ -l q,~`v
conn.commit(); R8fB
8 )
}catch(Exception e){ wnbKUlb
e.printStackTrace(); |kkg1M#
} finally{ Cb;49;q
try{ P}mn2Hs
if(ps!=null) { psE&Rx3)
ps.clearParameters(); O4Hc"v
ps.close(); (T2\
ps=null; kV+O|9
} +[$ Q C*
}catch(SQLException e){} ^EmI;ks
DBUtils.closeConnection(conn); Y`
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} R3@$ao
} Y@[Dy
public long getLast(){ OG}m+K&<
return lastExecuteTime; e'1}5Ky
} +umVl
public void run(){ 63y&M