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: 0M#N=%31
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CountBean.java sTKab
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/* ^H5w41
* CountData.java V.K70)]
* /{fZH,!L
* Created on 2007年1月1日, 下午4:44 F3r S6_
* 9USrgY6_
* To change this template, choose Tools | Options and locate the template under Rz.i/wg}
* the Source Creation and Management node. Right-click the template and choose YHETI~'j.
* Open. You can then make changes to the template in the Source Editor. W ;fH&r)d@
*/ qxf+#
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package com.tot.count; sTd}cP
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/** /yx=7<
* CCuxC9i7
* @author Rz`@N`U
*/ v\fzO#vj
public class CountBean { J*}VV9H
private String countType; /lf\
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int countId; "%:7j!#X|I
/** Creates a new instance of CountData */ E=;BI">.
public CountBean() {} NlA*\vco
public void setCountType(String countTypes){ Z -pyFK\
this.countType=countTypes; :6 Uk)
} !(B_EM
public void setCountId(int countIds){ !aQIh
this.countId=countIds; d>^~9X
} 5+y@ ]5&g
public String getCountType(){ *w=z~Jq^R"
return countType; F`fGz)Mk
} ,"@w>WL<9
public int getCountId(){ (3AYy0J%
return countId; rQ=xcn[A
} MPjr_yc]
} hA@zoIoe
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CountCache.java PASuf.U$"
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/* XXXljh6
* CountCache.java n)tU9@4Np
* ;JAK[o8i
* Created on 2007年1月1日, 下午5:01 i B%XBR
* dj3|f{kg{
* To change this template, choose Tools | Options and locate the template under &K06}[J
* the Source Creation and Management node. Right-click the template and choose +*n]tlk
* Open. You can then make changes to the template in the Source Editor. USE [N
*/ ah 4kA LO
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package com.tot.count; 'n>K^rA
import java.util.*; $X`bm*
/** Mg#`t$u
* U%Dit
* @author {*sGhGwr
*/ 0xN!DvCg>.
public class CountCache { (2:
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public static LinkedList list=new LinkedList(); : @s8?eg
/** Creates a new instance of CountCache */ +:}kZDl@ X
public CountCache() {}
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public static void add(CountBean cb){ ex.+'m<g
if(cb!=null){ &8Zeq3~
list.add(cb); T0g0jr{
} 1JIG+ZN md
} VxNXd?
} uH$oGY
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CountControl.java kl| g
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/* jz|VF,l
* CountThread.java Cm^Ylp
* 2>g^4(
* Created on 2007年1月1日, 下午4:57 ]Fxku<z7|
* HHZ`%
* To change this template, choose Tools | Options and locate the template under -4 8`#"xy
* the Source Creation and Management node. Right-click the template and choose KrS
* Open. You can then make changes to the template in the Source Editor. YmOldR9v(
*/ E\ tL
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package com.tot.count; [9LxhPi
import tot.db.DBUtils; 8IeI0f"l)
import java.sql.*; '[%jjUU
/** 1bd$XnU
* dQ,Q+ON>
* @author CdZnD#F2
*/ i)=m7i
public class CountControl{ X|,["Az
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private static long lastExecuteTime=0;//上次更新时间 Pv~: gP
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 )5U!>,fT
/** Creates a new instance of CountThread */ L"4]Tm>zq
public CountControl() {} \Ps5H5Qk;
public synchronized void executeUpdate(){ VDG|>#[!
Connection conn=null; &0s*PG
PreparedStatement ps=null; lbd(j{h>4
try{ F9%,MSt
conn = DBUtils.getConnection(); : g5(HH
conn.setAutoCommit(false); N=q#y@ L
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); <o2,HTWNPS
for(int i=0;i<CountCache.list.size();i++){ ti}f&w
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CountBean cb=(CountBean)CountCache.list.getFirst(); Zgy7!AF!
CountCache.list.removeFirst(); XJc
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ps.setInt(1, cb.getCountId()); C1tb`
ps.executeUpdate();⑴ UAdz-)$
//ps.addBatch();⑵ |4Qx=x>
} <Kg2$lu(_`
//int [] counts = ps.executeBatch();⑶ ><cU7 ja[^
conn.commit(); eap8*ONl
}catch(Exception e){ N0nj`
e.printStackTrace(); "$r1$mBi
} finally{ @$oZ|ZkZ
try{ 0iF -}o
if(ps!=null) { ndqckT@93
ps.clearParameters(); "sD1T3!\)Q
ps.close(); Z0aUHWms
ps=null; wE?CvL
} s"q=2i
}catch(SQLException e){} d @m\f
DBUtils.closeConnection(conn); bf1)M>g,O
} 7 I@";d8~
} qIz}$%!A
public long getLast(){ mf$Sa58
return lastExecuteTime; g
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} CG.,/]_
public void run(){ S"Kq^DN
long now = System.currentTimeMillis(); f9a$$nb3`
if ((now - lastExecuteTime) > executeSep) { >otJF3zw
//System.out.print("lastExecuteTime:"+lastExecuteTime); ?.Q3 pUT
//System.out.print(" now:"+now+"\n"); )(lJT&e
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); <1K7@Tu
lastExecuteTime=now; 3-iD.IAUm@
executeUpdate(); IytDvz*|
} sCkO0dl8
else{ V:OiW"/
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Jr]gEBX
} *!w25t
} 68p R:
} F_v-}bbcFQ
//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 T{tn.sT
7*/J4M N
类写好了,下面是在JSP中如下调用。 |g!`\@O
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<% 4vLw?_".
CountBean cb=new CountBean(); YQYX,b
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); $it@>L8
out.print(CountCache.list.size()+"<br>"); !9D1
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CountControl c=new CountControl(); {yS;NU`2
c.run(); ws[/
out.print(CountCache.list.size()+"<br>"); 7E\g
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