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: 289teU
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CountBean.java M0g!"0?
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/* Wo&10S w
* CountData.java /Hb'3,jN
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* Created on 2007年1月1日, 下午4:44 hyv*+FV;
* X+"8yZz3?
* To change this template, choose Tools | Options and locate the template under )$V}tr!
* the Source Creation and Management node. Right-click the template and choose \
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* Open. You can then make changes to the template in the Source Editor. Ag
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*/ zbn0)JO
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package com.tot.count; <kIg>+
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/** }
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* {tn%HK">
* @author .6S]\dp7~
*/ +Z[(s!
public class CountBean { /~*U'.V
private String countType; aY7kl
int countId; xB"o
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/** Creates a new instance of CountData */ k @'85A`
public CountBean() {} Ym6zNb8
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public void setCountType(String countTypes){ L/9f"%kZ
this.countType=countTypes; yE L^Y'x?
} q5J6d+
public void setCountId(int countIds){ Qag@#!&n
this.countId=countIds; E8#r<=(m
} so_
public String getCountType(){ 7RNf)nz
return countType; i9fK`:)
} "pTyQT9P
public int getCountId(){ "Wd?U[[
return countId; C'3/B)u}l
} 4jEPh{q
} j&) "a,f
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CountCache.java d54(6N%
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/* 0kP,Zj<
* CountCache.java &qqS'G*
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* Created on 2007年1月1日, 下午5:01 Rg~ ~[6G>
* *l:5FTp
* To change this template, choose Tools | Options and locate the template under %m r
* the Source Creation and Management node. Right-click the template and choose \AV6;;}&
* Open. You can then make changes to the template in the Source Editor. k6-.XW
*/ }l{r9ti
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package com.tot.count; Z{nJ\`
import java.util.*; ~L
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/** v
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* FRpTYLA2
* @author 5at\!17TY
*/ ;i|V++$_
public class CountCache { 6Ouy%]0$I3
public static LinkedList list=new LinkedList(); TGx:#x*k
/** Creates a new instance of CountCache */ |pk1pV |
public CountCache() {} D(6d#c
public static void add(CountBean cb){ QU0K'4Yx5j
if(cb!=null){ GGHe{l
list.add(cb); KrN#>do&<
} w8i"-SE
} J8w#J
} >(+g:p
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CountControl.java V4p4m@z^u
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/* {X$8yy2zC5
* CountThread.java !X721lNP
* .z7%74p
* Created on 2007年1月1日, 下午4:57 j<w";I&Diz
* HH/bBM!
* To change this template, choose Tools | Options and locate the template under A\J|eSG'$
* the Source Creation and Management node. Right-click the template and choose !DFT}eu
* Open. You can then make changes to the template in the Source Editor. KsI[
*/ ((L=1]w
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package com.tot.count; gE8p**LT+
import tot.db.DBUtils; VE{[52
import java.sql.*; yZFm<_9>
/** [U[saR\
* dX|(n.}
* @author \5.36Se
*/ g}nlb.b]{m
public class CountControl{ LO{{3No
private static long lastExecuteTime=0;//上次更新时间 w7}m
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 "F%w{bf
/** Creates a new instance of CountThread */ ta\AiHm
public CountControl() {} _/0vmgQ&
public synchronized void executeUpdate(){ tpp. 9
Connection conn=null; =9@{U2 =l
PreparedStatement ps=null; !}fq%8"-
try{ 9fR`un)f}
conn = DBUtils.getConnection(); y\7 -!
conn.setAutoCommit(false); 3}{od$3G
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Yg@k+
for(int i=0;i<CountCache.list.size();i++){ "e<Z$"7i
CountBean cb=(CountBean)CountCache.list.getFirst(); J*s!(J |Q
CountCache.list.removeFirst(); j8kax/*[
ps.setInt(1, cb.getCountId()); MzLnD D^
ps.executeUpdate();⑴ W]cJP
//ps.addBatch();⑵ D.?Rc'yD
} B;.]<k'3
//int [] counts = ps.executeBatch();⑶ `0a=A#]1o
conn.commit(); /Zs;dam
}catch(Exception e){ ./nq*4=
e.printStackTrace();
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} finally{ WO{V,<;
try{ }nNZp
if(ps!=null) { Kp[ F@A#
ps.clearParameters(); Ul#||B .c{
ps.close(); @C7iflo6
ps=null; ht _fbh(l
} P)bS ;w\(Y
}catch(SQLException e){} !#P|2>>u
DBUtils.closeConnection(conn); 63R?=u@
} OrN>4S
} yxq+<A4,a
public long getLast(){ .9X, )^D
return lastExecuteTime; &c<0g`x
} K^0cL%dB
public void run(){ KICy!
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long now = System.currentTimeMillis(); wWV`k
if ((now - lastExecuteTime) > executeSep) { 0c*y~hUVZ
//System.out.print("lastExecuteTime:"+lastExecuteTime); RzG7Xr=t
//System.out.print(" now:"+now+"\n"); Z9rmlVU6!
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); $*EK
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lastExecuteTime=now; 5&V0(LT]C
executeUpdate(); R7YLI1ov
} (3kz(6S
else{ o'nju.'
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
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} Y]
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} NYopt?Xg
} {.=4;
//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 !Cse,6/Z
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类写好了,下面是在JSP中如下调用。 .|=~x3mPw
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<% HPM
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CountBean cb=new CountBean(); $kPC"!X\
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); >|h$d:~n
CountCache.add(cb); zq ;YE
out.print(CountCache.list.size()+"<br>"); ^~iu),gu
CountControl c=new CountControl(); .{,PC
c.run(); %-C
out.print(CountCache.list.size()+"<br>"); ('yBIb\ue
%>