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: Gv[s86AP,
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CountBean.java xi51,y+(5
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/* },n?
* CountData.java q9:g
* +GJPj(S
* Created on 2007年1月1日, 下午4:44 "1YwV~M5
* rD+mI/_J`
* To change this template, choose Tools | Options and locate the template under VV;%q3}:
* the Source Creation and Management node. Right-click the template and choose Rk,'ujc
* Open. You can then make changes to the template in the Source Editor. beaSvhPU
*/ ({ O~O5k
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package com.tot.count; {E; bT|3z
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/** }*
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* ,ZghV1z
* @author [
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*/ fat;5XL@
public class CountBean { 3eg6 CdT
private String countType; ^T:L6:
int countId; E!'6vDVC:
/** Creates a new instance of CountData */ AsD$M*It
public CountBean() {} G6QD`ED
public void setCountType(String countTypes){ o%bf7)~s
this.countType=countTypes; |1GOm=GNK
} lEgjv,
public void setCountId(int countIds){ h@E7wp1'~
this.countId=countIds; c/Fgx/hr
} -woFKAy`
public String getCountType(){ (3Q$)0t
return countType; JK`$/l|7
} s+~GQcj<T
public int getCountId(){ )=#e*1!b
return countId; Esu{c9,
} j]FK.G'
} g<@Q)p*ow
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CountCache.java eTFep^[
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/* I_5/e>9
* CountCache.java N>Ih2>8t
* W]oa7VAq
* Created on 2007年1月1日, 下午5:01 C1'y6{,@
* {,i-V57-h
* To change this template, choose Tools | Options and locate the template under l$1NI#&
* the Source Creation and Management node. Right-click the template and choose ZNne 8
* Open. You can then make changes to the template in the Source Editor. /vq$/
*/ dQ:F 5|p
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package com.tot.count; `m#-J;la
import java.util.*; Vpne-PW
/** GGnlkp& E
* 8\"Gs z
* @author Th$Z9+()
*/ @R}3f6@67
public class CountCache { 9/!1J
public static LinkedList list=new LinkedList(); <#J5.I 1
/** Creates a new instance of CountCache */ OLPY<ax
public CountCache() {} &8w#
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public static void add(CountBean cb){ PW|=IPS
if(cb!=null){ k_{?{:X;y
list.add(cb); Fsm6gE`|n
} pU9.#O
} ]Zt ]wnL+
} Q5ff&CE
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CountControl.java (BFwE@1"
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/* pmUf*u-
* CountThread.java 76"4Q!
* r<vy6
* Created on 2007年1月1日, 下午4:57 VP>*J`'H
* PxgJ7d
* To change this template, choose Tools | Options and locate the template under a_+?#m
* the Source Creation and Management node. Right-click the template and choose ]+46r!r|
* Open. You can then make changes to the template in the Source Editor. y+T[="W
*/ 9@ YKx0
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package com.tot.count; ax>j3HKi
import tot.db.DBUtils; m3BL
import java.sql.*; #GLW3}
/** ,%
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* 'UUj(1
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* @author oz>2P.7
*/ Q&N#q53
public class CountControl{ :IU7dpwDl
private static long lastExecuteTime=0;//上次更新时间 #gqh0 27
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 (5 @H
/** Creates a new instance of CountThread */ ;xe.0j0h
public CountControl() {} BO#tn{(#
public synchronized void executeUpdate(){ yw$4Hlj5
Connection conn=null; 5e$1KN`
PreparedStatement ps=null; vjS=ZinN"
try{ 4MS#`E7LrC
conn = DBUtils.getConnection(); s:7/\h
conn.setAutoCommit(false); h Fik>B#!
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Hc=QSP
for(int i=0;i<CountCache.list.size();i++){ ghWWJx9
CountBean cb=(CountBean)CountCache.list.getFirst(); %2T
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CountCache.list.removeFirst(); h#"$W;(
ps.setInt(1, cb.getCountId()); 7]xDMu'^&f
ps.executeUpdate();⑴ R?O)vLmd
//ps.addBatch();⑵ 6IG?t
} Kc?4q=7q
//int [] counts = ps.executeBatch();⑶ &G\mcstX
conn.commit(); y0sce
}catch(Exception e){ w+>+hq
e.printStackTrace(); \OA{&G.
} finally{ 4[@YF@_=M
try{ t|eH'"N%o
if(ps!=null) { EC;>-s
ps.clearParameters(); _ Lb"yug
ps.close(); gr*CN<
ps=null; ;5bd<N
} q6)fP4MQ]
}catch(SQLException e){} kFwFPK%B
DBUtils.closeConnection(conn);
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} ^APtV6g
} xy[#LX)RW
public long getLast(){ 29,ET}~
return lastExecuteTime; nq]6S$3
6
} <-!1`@l>
public void run(){ /O}<e TR
long now = System.currentTimeMillis(); s{Y4wvQyB
if ((now - lastExecuteTime) > executeSep) { '1:) q
//System.out.print("lastExecuteTime:"+lastExecuteTime); vUJ;D
//System.out.print(" now:"+now+"\n"); 8Rwk
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); u*G<?
lastExecuteTime=now; a&x:_vv
executeUpdate(); <mE`<-$
} X n$ZA-
else{ R,G*]/r`
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :R,M Y"(
} Ha `N
} nf/?7~3?[
} }I&.xzJ
//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 ZrTB%
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类写好了,下面是在JSP中如下调用。 \]V:>=ry>
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<% ^;RK-)
CountBean cb=new CountBean(); [|OII!"
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); P[WkW#
CountCache.add(cb); Gv&G2^
out.print(CountCache.list.size()+"<br>"); w!7ApEH1
CountControl c=new CountControl(); @|SeabN^-
c.run(); (c(F1=K
out.print(CountCache.list.size()+"<br>"); ZpVkgX4
%>