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: oQ\&}@(V
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CountBean.java lL0M^Nv
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/* `eR 7H>I
* CountData.java Gq1)1
* 64umul
* Created on 2007年1月1日, 下午4:44 ^_W40/c3
* i%F<AY\O)
* To change this template, choose Tools | Options and locate the template under Z!_n_Fk
* the Source Creation and Management node. Right-click the template and choose nQ-mmY>#
* Open. You can then make changes to the template in the Source Editor. R,,Qt
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*/ (` c
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package com.tot.count; <#*.}w~
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/** wd+K`I/v7h
* I 8zG~L%"
* @author 0` 5e
*/ u-:Ic.ZV
public class CountBean { 'SV7$,mK@
private String countType; 2 hq\n<
int countId; cP rwW6
/** Creates a new instance of CountData */ vFhz!P~
public CountBean() {} t,<UohL|z
public void setCountType(String countTypes){ (>7>3
this.countType=countTypes; >bIF>9T
} :FHA]oec1
public void setCountId(int countIds){ Ej"u1F14J
this.countId=countIds; !YE zFU`L
} ue\t ,*KYd
public String getCountType(){ |`0n"x7
return countType; pW|u P8#
} fzPZ|
public int getCountId(){ |]sx+NlNc
return countId; JvL{| KtyU
} Cy@ cLdV
} L'E^c,-x~
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CountCache.java >cgpaj x*
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/* U(,.D}PG
* CountCache.java 6gU{(H
* uM S*(L_
* Created on 2007年1月1日, 下午5:01 sn{tra
* Mu&x_&|
* To change this template, choose Tools | Options and locate the template under y{=>$C[
* the Source Creation and Management node. Right-click the template and choose ZA820A>2!
* Open. You can then make changes to the template in the Source Editor. |5MbAqjzC
*/ t'(1I|7
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package com.tot.count; /+[63=fl
import java.util.*; 1@qgF
/** +B"0{>n}F
* ;rR/5d1!
* @author %!|O.xxRR
*/ Mvcfk$pA
public class CountCache { ar^i|`D
public static LinkedList list=new LinkedList(); Or+p%K}-7
/** Creates a new instance of CountCache */ :YO@_
public CountCache() {} sWqM?2g
public static void add(CountBean cb){ -d=WV:G%e
if(cb!=null){ >*1}1~uU`'
list.add(cb); ~ ?^/u8
} | C+o;
} caq} &A]C
} tef^ShF]
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CountControl.java )^x K
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/* |yY`s6Uq
* CountThread.java NNkP\oh\
* 8@\7&C(g17
* Created on 2007年1月1日, 下午4:57 "![L#)"s
* qoX@@xr1
* To change this template, choose Tools | Options and locate the template under ]A+o>#n}x
* the Source Creation and Management node. Right-click the template and choose Es4qPB`g.
* Open. You can then make changes to the template in the Source Editor. ',=g;
*/ 5V5w:U>_z
~
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package com.tot.count; C9~~O~7x
import tot.db.DBUtils; #Dy?GB08
import java.sql.*; h~}.G{"
/** l#qv 5f
* jvwwJ<K
* @author i$^ZTb^
*/ v"O5u%P
public class CountControl{ '7)"
private static long lastExecuteTime=0;//上次更新时间 ,kM)7!]N
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 :d,^I@]
/** Creates a new instance of CountThread */ zfI}Q}p
public CountControl() {} Acm<-de
public synchronized void executeUpdate(){ }
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Connection conn=null; ~Y!kB:D5;~
PreparedStatement ps=null; EbQa?
try{ LIpEQ7;
conn = DBUtils.getConnection(); X[3}?,aqL
conn.setAutoCommit(false); Ip
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); U5r}6D!)
for(int i=0;i<CountCache.list.size();i++){ cj$6
CountBean cb=(CountBean)CountCache.list.getFirst(); ~mp0B9L%
CountCache.list.removeFirst(); 1KE:[YQ1
ps.setInt(1, cb.getCountId()); kxB.,'
ps.executeUpdate();⑴ g P}+wbk
//ps.addBatch();⑵ rZ03x\2
} -ysn&d\rV
//int [] counts = ps.executeBatch();⑶ 7jG(<!,
conn.commit(); ROb\Rxm
}catch(Exception e){ 19U]2D/z
e.printStackTrace(); kLP0{A
} finally{ UQ?%|y*Kc
try{ X$n(-65
if(ps!=null) { zu\`1W^
ps.clearParameters(); 7/IlL
ps.close(); 3iNkoBCg
ps=null; @%ECj)u`O
} f'Mop= .
}catch(SQLException e){} ,_
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DBUtils.closeConnection(conn); K\?]$dK5
} DBH#)4do@
} {dWObh
public long getLast(){ uE5X~
return lastExecuteTime; e":G*2a
} vGd1w%J-
public void run(){ PAF8Wlg
long now = System.currentTimeMillis(); 9$*s8}|
if ((now - lastExecuteTime) > executeSep) { 7<\C?`q"
//System.out.print("lastExecuteTime:"+lastExecuteTime); zw@'vncc
//System.out.print(" now:"+now+"\n"); 8?FueAM'
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 5"KlRuv%
lastExecuteTime=now; 2umv|]n+l|
executeUpdate(); #1nJ(-D+
} KLWDo%%u
else{ 0Q9T3X
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )xU-;z0"~
} 6;b9swmh
} fxQN+6;
} $iw%(H
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 6dqsFns}e
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类写好了,下面是在JSP中如下调用。 Hf gz02Z$
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<% s][24)99
CountBean cb=new CountBean(); X@A1#z+s0]
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); %eWqQ3{P]
CountCache.add(cb); }Fb!?['G5
out.print(CountCache.list.size()+"<br>"); kL*0M<0 (
CountControl c=new CountControl(); qdD)e$XW,
c.run(); N@T.T=r
out.print(CountCache.list.size()+"<br>"); ed!>)Cb
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