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: pOpie5)7X
jja9:$#
CountBean.java FG1$_zN |
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/* {}{|trr-E
* CountData.java oF)+f4
* / IAK'/
* Created on 2007年1月1日, 下午4:44 { ~FYiX
* GS4!c8>
* To change this template, choose Tools | Options and locate the template under \KDOI 7
* the Source Creation and Management node. Right-click the template and choose ,B h[jb`y
* Open. You can then make changes to the template in the Source Editor. &3'II:x(
*/ D 0\
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package com.tot.count; VO/"
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/** kce+aiv|u
* Dm"GCV
* @author >/eQjp?:
*/ @ 4j#X
public class CountBean { {pm>F}Cwy
private String countType; ]7fqVOiOu
int countId; J'.U+XU
/** Creates a new instance of CountData */ > & \QLo[5
public CountBean() {} G}AfCd4
public void setCountType(String countTypes){ ^+Ec}+ Q
this.countType=countTypes; LKFL2|af
} x$ ?{)EY
public void setCountId(int countIds){ J$v0
this.countId=countIds; *GTCVxu
} v.c2(w/P
public String getCountType(){ }| (KI
return countType; KPs5? X
} jx+%X\zokA
public int getCountId(){ A#f@0W:
return countId; Tr-gdX ;
} )1Z*kY?f!
} Z~9\7QJn
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CountCache.java %, XyhS5[o
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/* ^kzw/.I{
* CountCache.java Cn[`]
* U8\[8~Xftn
* Created on 2007年1月1日, 下午5:01 ,ZC ^,Vq
* l{E+j%
* To change this template, choose Tools | Options and locate the template under 5kofO
* the Source Creation and Management node. Right-click the template and choose oost}%WxN
* Open. You can then make changes to the template in the Source Editor. Sz.jv#Y
*/ { P&l`
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package com.tot.count; .UU BAyjm
import java.util.*; oZA?}#DRl
/** '/Hx0]V
* mflH &Bx9
* @author !/BXMj,=
*/ ezY
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public class CountCache { "'~'xaU!=a
public static LinkedList list=new LinkedList(); JD^(L~ n]
/** Creates a new instance of CountCache */ '@3hU|jO!
public CountCache() {} Q!(C$&f
public static void add(CountBean cb){ R]0awV1b
if(cb!=null){ e3yBB*@
list.add(cb); w<lHY=z E
} 3BDAvdJ4.
} {r#2X1
} hp@giu7
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CountControl.java H B_si
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/* >c|u|^3zt
* CountThread.java %J!+f-:=
* f.!)O@HzH
* Created on 2007年1月1日, 下午4:57 Rq%g5lK
* ?PO~$dUc]
* To change this template, choose Tools | Options and locate the template under +FP*RNM
* the Source Creation and Management node. Right-click the template and choose YYzj:'
* Open. You can then make changes to the template in the Source Editor. Q
*![u5#
*/ h1^q};3!W\
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package com.tot.count; kQxY"HD
import tot.db.DBUtils; }:5AB93(
import java.sql.*; sZ/~pk
/** eva-?+n\q
* s +gZnne
* @author )Fe-C
*/ F0t!k>
public class CountControl{ !?`5r)K
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 cE
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/** Creates a new instance of CountThread */ R%Gh4y\nF
public CountControl() {} RX P 0
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public synchronized void executeUpdate(){ (Eq0 |"cj
Connection conn=null; \Azl6`Em
PreparedStatement ps=null;
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try{ %=xR$<D
conn = DBUtils.getConnection(); o$FqMRep
conn.setAutoCommit(false); )q&=x2`
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); s?@{
for(int i=0;i<CountCache.list.size();i++){ HF"
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CountBean cb=(CountBean)CountCache.list.getFirst(); a;|C51GH
CountCache.list.removeFirst(); 7SE\(K=<%
ps.setInt(1, cb.getCountId()); I83ZN]
ps.executeUpdate();⑴ .iNPLz1
//ps.addBatch();⑵ 8zP{Cmm
} vz</|s
//int [] counts = ps.executeBatch();⑶ O4ciD1
conn.commit(); B @H.O!
}catch(Exception e){ , |CT|2D>
e.printStackTrace(); O,>1GKw"\
} finally{ ja3wXz$2
try{ {}H5%W
if(ps!=null) { In#V1[io
ps.clearParameters(); W'hE,
ps.close(); Yv\.QrxPm
ps=null; awQf$
} =W"BfG
}catch(SQLException e){} v|C)Q %v
DBUtils.closeConnection(conn); *
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} 3<LG~HWST
} uvz}qH@j/Q
public long getLast(){ V'sp6:3*\
return lastExecuteTime; b*S:wfw
} ,'?%z>RZm
public void run(){ ER~m
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long now = System.currentTimeMillis(); 4J
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if ((now - lastExecuteTime) > executeSep) {
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//System.out.print("lastExecuteTime:"+lastExecuteTime); PdcF
//System.out.print(" now:"+now+"\n"); [8l;X:
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); n|dLK.Q
lastExecuteTime=now; W|_
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executeUpdate(); Gnop
} !:PF |dZ
else{ O'{UAb+-
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =G2D4>q
} |q"WJQ
} c+c3C8s*8
} <GC<uB |p
//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 Wu(6FQ`H
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类写好了,下面是在JSP中如下调用。 w-*$gk]
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<% R}IMX9M=
CountBean cb=new CountBean(); Wly-z$\
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); mO;X>~K
CountCache.add(cb); %wn|H>
out.print(CountCache.list.size()+"<br>"); %p6"Sg*
CountControl c=new CountControl(); TkXD#%nFY
c.run(); Aq@_^mq1A
out.print(CountCache.list.size()+"<br>"); q[`)A?Ae
%>