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: At flf2 K
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CountBean.java qY~`8
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/* A/s>PhxV
* CountData.java 9;Itqe{8w
* ,Vh.T&X5
* Created on 2007年1月1日, 下午4:44 ZZcEt
* QFg sq{
* To change this template, choose Tools | Options and locate the template under 6fd+Q
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* the Source Creation and Management node. Right-click the template and choose a["2VY6Eq@
* Open. You can then make changes to the template in the Source Editor. ]4h92\\965
*/ 70f Klp
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package com.tot.count; .mDM[e@'
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/** p!sWYui
* Np'2}6P
* @author $-#Yl&?z9
*/ p3]_}Y
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public class CountBean { si&S%4(
private String countType; ?CC"Yij
int countId; y]J89
/** Creates a new instance of CountData */ OH5>vV'i
public CountBean() {} Jrg2/ee,*
public void setCountType(String countTypes){ 3dht!7/
this.countType=countTypes; R
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} PQK(0iCo4
public void setCountId(int countIds){ -8r
this.countId=countIds; =+-Yxh|*
} krsYog(^z
public String getCountType(){ Hir Fl
return countType; dxZu2&gi
} ({JHZ6uZ
public int getCountId(){ N@Y ljz|
return countId; = M]iIWQ@`
} YnxRg
} 'XzXZJ[uq
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CountCache.java C?i >.t
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/* X{we/'>
* CountCache.java U Z|HJ8_
* h$.:Uj8/
* Created on 2007年1月1日, 下午5:01 'ihhoW8
* L0&RvI#
* To change this template, choose Tools | Options and locate the template under AJSx%?h:6
* the Source Creation and Management node. Right-click the template and choose M/):e$S
* Open. You can then make changes to the template in the Source Editor. l5g$vh\aQ]
*/ 0pJ
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package com.tot.count; [5uRS}!
import java.util.*; 'v\L @"
/** 3,]gEE3
* Ya;9]k8,
* @author `.T}=j|
*/ yv\#8I:qh
public class CountCache { j'aHF#_
public static LinkedList list=new LinkedList(); :^Fh!br==
/** Creates a new instance of CountCache */ DK=cVpN%s
public CountCache() {} n+BJxu?
public static void add(CountBean cb){ jL^](J>
if(cb!=null){ WdZ:K,
list.add(cb); t=u
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} 0 H0-U'l
} rp6q?3=g
} 63.wL0~
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CountControl.java ,oNOC3U
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/* ZxlAk+<]
* CountThread.java ?UK|>9y}Z
* KAsS[
* Created on 2007年1月1日, 下午4:57 9_QP !,
* -AhwI
* To change this template, choose Tools | Options and locate the template under MB%Q WU
* the Source Creation and Management node. Right-click the template and choose @^;j)%F}
* Open. You can then make changes to the template in the Source Editor. f+|$&p%
*/ i~3u>CT
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package com.tot.count; ALEnI@0
import tot.db.DBUtils; M;0]u.D*=
import java.sql.*; /s-A?lw^2
/** ,^gyH
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* RN)dS>$
* @author ?-tVSRKQ
*/ ?6nF~9Z'
public class CountControl{ 5C"QE8R o
private static long lastExecuteTime=0;//上次更新时间 ]c&<zeX,
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 FSRm|
/** Creates a new instance of CountThread */ h'$QC )P
public CountControl() {} 8)kLV_+%
public synchronized void executeUpdate(){ _;4 [Q1
Connection conn=null; *=fr8
PreparedStatement ps=null; .i^7|o:
try{ gPu2G/Y
conn = DBUtils.getConnection(); |A%<Z(
conn.setAutoCommit(false); t6BHGX{o
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); DfV~!bY
for(int i=0;i<CountCache.list.size();i++){ xAu/
CountBean cb=(CountBean)CountCache.list.getFirst(); pA;-vMpMj
CountCache.list.removeFirst(); .))v0
ps.setInt(1, cb.getCountId()); BC,.^"fA6
ps.executeUpdate();⑴ AW#<i_Ybf
//ps.addBatch();⑵ [xh*"wT#g
} ,-+"^>
//int [] counts = ps.executeBatch();⑶ lCF`*DM#
conn.commit(); sz--27es
}catch(Exception e){ }<PxWZ`,\
e.printStackTrace(); '\3.isTsx
} finally{ xdSj+507
try{ lVKF^-i
if(ps!=null) { Xwn|.
ps.clearParameters(); >?Y3WPB<F
ps.close(); uc
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ps=null; 9=;g4I
} W71#NjM2Z
}catch(SQLException e){} sRI=TE]s
DBUtils.closeConnection(conn); JZ*?1S>
} Ffqn|}gb
} :y)&kJpleP
public long getLast(){ P<w>1
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return lastExecuteTime; enO=-#
} -
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public void run(){ 9hi(P*%q
long now = System.currentTimeMillis(); gbi~!S-
if ((now - lastExecuteTime) > executeSep) { 7*W$GCd8
//System.out.print("lastExecuteTime:"+lastExecuteTime); <Ucfd
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//System.out.print(" now:"+now+"\n"); oz7udY=]0
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 5nlyb,"^g
lastExecuteTime=now; &ppZRdq]
executeUpdate(); :=fHPT
} aIyY%QT
else{ 4zvU"np
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 1 jd=R7
} sjbC~Te--
} olW`.3f
} 9(\N+
//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 krT!AfeV
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类写好了,下面是在JSP中如下调用。 E8V\J
@G&xq"Fg7
<% o".O#^3H%
CountBean cb=new CountBean(); )1'_g4
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Qpu2RfP
CountCache.add(cb); :BiR6>1:
out.print(CountCache.list.size()+"<br>"); c35vjYQx0
CountControl c=new CountControl(); &^<T/PiR
c.run(); `SpS?mWA
out.print(CountCache.list.size()+"<br>"); `9NnL.w!
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