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: Ssa/;O2
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CountBean.java "4smW>f:%
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/* e2;=OoBK
* CountData.java l<sWM$ez
* \B/( H)Cd*
* Created on 2007年1月1日, 下午4:44 (lYC2i_b#
* l`0JL7
* To change this template, choose Tools | Options and locate the template under ao2o!-?!t
* the Source Creation and Management node. Right-click the template and choose GLV`IkU %
* Open. You can then make changes to the template in the Source Editor. G8^b9xoA+.
*/ Pj8Vl)8~NV
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package com.tot.count; Z,XivU&
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/** x5U;i
* ,(c'h:@M
* @author #&{)`+!"
*/ u6\W"LW
public class CountBean { \vj xCkg{
private String countType; =PLy^%
int countId; ;4oKF7]
/** Creates a new instance of CountData */ =*y{y)B^g
public CountBean() {} G
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public void setCountType(String countTypes){ ?f:\&+.&
this.countType=countTypes; j=>WWlZ
} e<Oz%
public void setCountId(int countIds){ Dp@m"_1`+
this.countId=countIds; CFY4PuI"!
} 'xM\txZ;
public String getCountType(){ XT==N-5,
return countType; +#'QP#
} \nV oBW(
public int getCountId(){ @(tuE
return countId; <@@@Pl!~
} U.WMu%
} ,}Ic($To
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CountCache.java n6IN I~,
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/* 4Gy3s|{
* CountCache.java LA837%)
* a>nV!b\n5
* Created on 2007年1月1日, 下午5:01 |qibO \_
* lCK:5$
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* To change this template, choose Tools | Options and locate the template under ."v&?o
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* the Source Creation and Management node. Right-click the template and choose ><;.vP
* Open. You can then make changes to the template in the Source Editor. &\r_g!Mh
*/ @Tzh3,F2
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package com.tot.count; O.*, e
import java.util.*; ]#[R^t
/** D{/GjFO
* TP oP%Yj"
* @author $3%EKi
*/ -q\1Tlc]3
public class CountCache { / '}O-h
public static LinkedList list=new LinkedList(); #2&_WM!
/** Creates a new instance of CountCache */ w.Ft-RXA W
public CountCache() {} y:Qo:Z~
public static void add(CountBean cb){ (_E<?
if(cb!=null){ 'LR5s[$j
list.add(cb); F\&R nDJ
} eEQ
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} l>S~)FNwXJ
} BfIGw
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CountControl.java Hc4]2pf
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/* N/mTG2'<
* CountThread.java m
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* $ T.c>13
* Created on 2007年1月1日, 下午4:57 3ePG=^K^
* ]7-*1kL8=~
* To change this template, choose Tools | Options and locate the template under =\?KC)F*e
* the Source Creation and Management node. Right-click the template and choose <`b)56v:+
* Open. You can then make changes to the template in the Source Editor. u-At k-2M
*/ WeE>4>^
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package com.tot.count; ;2-,Xzz8
import tot.db.DBUtils; f 6Bx>lh
import java.sql.*; SI)u@3hl&w
/** tD.md_E
* frk(2C8T
* @author ;dNKe.`Dg
*/ gEMxK2MNXj
public class CountControl{ 4}Y2
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private static long lastExecuteTime=0;//上次更新时间 a8FC#kfq
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ?A;x%8}
/** Creates a new instance of CountThread */ A$Mmnu%
public CountControl() {} M;,Q8z%
public synchronized void executeUpdate(){ >Q#_<IcI
Connection conn=null; k/?5Fs!#
PreparedStatement ps=null; tpO%)*
try{ dQQh$*IL?{
conn = DBUtils.getConnection(); B)O{+avu
conn.setAutoCommit(false); X<m#:0iD
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (\>3FwFHW|
for(int i=0;i<CountCache.list.size();i++){ 9"KEHf!
CountBean cb=(CountBean)CountCache.list.getFirst(); r*fZS$e
CountCache.list.removeFirst(); yf*^Y74
ps.setInt(1, cb.getCountId()); <<W{nSm#
ps.executeUpdate();⑴ (PE x<r1
//ps.addBatch();⑵ #!l\.:h%
} ,&rlt+wE
//int [] counts = ps.executeBatch();⑶ 9^,MC&eb
conn.commit(); 5fMVjd
}catch(Exception e){ Q\z6/1:9Z
e.printStackTrace(); h5e(Avk
} finally{ \3LP@;Phn
try{ OaY.T
if(ps!=null) { gE]6]L
ps.clearParameters(); _]@
ps.close(); V6P2W0m
ps=null; W+d=BnOa8
} /]zn8d
}catch(SQLException e){} ]1hW/!
DBUtils.closeConnection(conn); +sq'\Tbp
} S=B?bD_,c
} 3DRJl,v
public long getLast(){ Fcz7
return lastExecuteTime; Z:9xf:g*
} vVQwuV
public void run(){ Hd]o?q\
long now = System.currentTimeMillis(); 2wLnRP`*
if ((now - lastExecuteTime) > executeSep) { Wu3or"lcw*
//System.out.print("lastExecuteTime:"+lastExecuteTime); D])&>
//System.out.print(" now:"+now+"\n"); [qbZp1s|(
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ,Ta k',
lastExecuteTime=now; C+o1.#]JM
executeUpdate(); Yuo:hF\DH
} ~(i#A>
else{ 3/_rbPr
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3-x ;_
} czNi)4x
} K#Ia19au5
} E2dl}S zp
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 wW &q)WOi
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类写好了,下面是在JSP中如下调用。 )Y4;@pEU
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<% 8/W(jVO(-
CountBean cb=new CountBean(); #+CH0Z
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5j'7V1:2
CountCache.add(cb); 3.?G,%S5.$
out.print(CountCache.list.size()+"<br>"); 4eVQO%&2
CountControl c=new CountControl(); xqm-m
c.run(); ;wGoEN
out.print(CountCache.list.size()+"<br>"); 0zQ~'x
%>