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:
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CountBean.java *3+-W
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/* 9lzQ\}
* CountData.java SNY (*
* xvm5
* Created on 2007年1月1日, 下午4:44 !iu5OX7K|
* B!S 167Op
* To change this template, choose Tools | Options and locate the template under \~DM
* the Source Creation and Management node. Right-click the template and choose Le#spvV3J|
* Open. You can then make changes to the template in the Source Editor. F4C!CUI
*/ tw K^I6@
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package com.tot.count; UT]?;o"
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/** "&o,yd%
* E3l*8F%<3
* @author uh3)0.nR
*/ b>=_*nw9
public class CountBean { !]koSw}
private String countType; |%7cdMC
int countId; cDkV;$
/** Creates a new instance of CountData */ smy}3k
public CountBean() {} w4};q%OBj
public void setCountType(String countTypes){ -j2 (R?a
this.countType=countTypes; &1^%Nxu1
} 4YROB912
public void setCountId(int countIds){ ^Z,q$Gp~P
this.countId=countIds; 2KJ1V+g@a6
} 5er@)p_
public String getCountType(){ ]N)DS+V/
return countType; z~oDWANP
} kdrod [S
public int getCountId(){ p.K*UP
return countId; -*ELLY[
} ^))RM_ic
} iz^qR={bW
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CountCache.java '-PC7"o
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/* #2p#VQh
* CountCache.java n D6G
* :7.Me;RA
* Created on 2007年1月1日, 下午5:01 S;\R!%t_
* {3\R|tZh,`
* To change this template, choose Tools | Options and locate the template under 3{7T4p.G
* the Source Creation and Management node. Right-click the template and choose :QQlI
* Open. You can then make changes to the template in the Source Editor. 5]Da{Wmgs
*/ Ub$n |xn
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package com.tot.count; `#s#it'y
import java.util.*; FiAY\4
/** Ve 3 ;
* S -&)p@4
* @author ixfdO\nU
*/ P
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public class CountCache { l&(l$@t
public static LinkedList list=new LinkedList(); [a1jCo
/** Creates a new instance of CountCache */ s4LO&STh{
public CountCache() {} #CUzuk&
public static void add(CountBean cb){ pHE}ytcT
if(cb!=null){ PO-"M)M
list.add(cb); Gs0H@
} U]6&b
} wFS2P+e;X
} P7 y q^|
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CountControl.java XFwLz
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}
/* aEVsU|
* CountThread.java lTRl"`@S
* PH3 >9/H
* Created on 2007年1月1日, 下午4:57 TV59(bG.2
* @J'YV{]
* To change this template, choose Tools | Options and locate the template under Vzlh+R>c
* the Source Creation and Management node. Right-click the template and choose .giz=*q+
* Open. You can then make changes to the template in the Source Editor. P1>AOH2yG
*/ ?}p:J{
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package com.tot.count; m"2d$vro"
import tot.db.DBUtils; |9K<-yD
import java.sql.*; 1`bl&}6l|E
/** ,yMU@Vg
* i&Fiq&V)[
* @author _Q(g(p&
*/ N!&:rK
public class CountControl{ b-5y9 K
private static long lastExecuteTime=0;//上次更新时间 TX8<J>x
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 l{c]p-
/** Creates a new instance of CountThread */ &K+0xnUH
public CountControl() {} csZc|kDI
public synchronized void executeUpdate(){ A
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Connection conn=null; &}6KPA;
PreparedStatement ps=null; z;\d L
try{ DPn=n9n2
conn = DBUtils.getConnection(); 6=hk=2]f
conn.setAutoCommit(false); ,FzeOSy'p
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); K*-@Q0"KM{
for(int i=0;i<CountCache.list.size();i++){ d(`AXyw
CountBean cb=(CountBean)CountCache.list.getFirst(); (oz$B0HO:
CountCache.list.removeFirst(); F/c$v
ps.setInt(1, cb.getCountId()); Mj=$y?d ]
ps.executeUpdate();⑴ E; $+f
//ps.addBatch();⑵ cE'L% Z
} u"xJjS
//int [] counts = ps.executeBatch();⑶ B@YyQ'
conn.commit(); {XurC}#\
}catch(Exception e){ 58xnB!h\}
e.printStackTrace(); =WZqQq{
} finally{ 7%?jL9Vw
try{ sZgRt
if(ps!=null) { Ck =;1sGh
ps.clearParameters(); qml2XJ>
ps.close(); ,Tagj`@bHc
ps=null; `?(Bt|<>
} :G w~7v_
}catch(SQLException e){} ]q5`YB%_
DBUtils.closeConnection(conn); 4\ c,)U}
} MTGiAFE
} 6(|d|Si *c
public long getLast(){
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return lastExecuteTime; M@1r:4CoKH
} n(nBRCG)o
public void run(){ ixm&aW6<
long now = System.currentTimeMillis(); 3ss6_xd+
if ((now - lastExecuteTime) > executeSep) { p}b/XnV$~
//System.out.print("lastExecuteTime:"+lastExecuteTime); c)md
//System.out.print(" now:"+now+"\n"); |tzg:T;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ;{[>&4
lastExecuteTime=now; 6pOx'u>h+
executeUpdate(); y;?ie]3G
} Q^K "8 ;
else{ dUznxZB
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); `cQo0{xK
} w6dFb6~R
} d1@%W;qX!
} C${S^v
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 8n BL\{'B[
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类写好了,下面是在JSP中如下调用。 Zc
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<% <!$:8ls
CountBean cb=new CountBean(); $GQ`clj<
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); lDC$F N
CountCache.add(cb); yL^UE=#C_
out.print(CountCache.list.size()+"<br>"); BG^C9*ZuP
CountControl c=new CountControl(); f=!PllxL:
c.run(); UX<Qcjm$e
out.print(CountCache.list.size()+"<br>"); m\>a,oZH
%>