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: zgTi Az
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CountBean.java \>azY
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/* BkqW>[\5xm
* CountData.java ]a~LA7VHO
* 7u0R=q
* Created on 2007年1月1日, 下午4:44 5!p'n#_
* H5t`E^E
* To change this template, choose Tools | Options and locate the template under @x
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* the Source Creation and Management node. Right-click the template and choose zhL,BTH
* Open. You can then make changes to the template in the Source Editor. ?E@[~qq_
*/ "$YLU}S9
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package com.tot.count; RL8wSK
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/** Bq`kVfx
* <cjTn:w
* @author
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*/ /a)=B)NH
public class CountBean { Xh!Pg)|E
private String countType; 'mR+W{r
int countId; wajhFBJ
/** Creates a new instance of CountData */ 1"PE@!]
public CountBean() {} )C6 7qY[P
public void setCountType(String countTypes){ 9F!&y-
this.countType=countTypes; ~[6|VpGc:
} !qv;F?2
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public void setCountId(int countIds){ k] YGD
this.countId=countIds; W}3vY]
} c17==S
public String getCountType(){ )uWNN"
return countType; 3f8Z?[Bb@
} d69VgLg
public int getCountId(){ L@GD$F=<0
return countId; ^2@~AD`&h
} (Ad!hyE(
} o|C{ s
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CountCache.java T0jJp7O
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/* G"wQ(6J@
* CountCache.java mr.DP~O:9p
* _"`h~jB
* Created on 2007年1月1日, 下午5:01 ~Wv?p4
* 9B0"GEwrs
* To change this template, choose Tools | Options and locate the template under [hbIv
* the Source Creation and Management node. Right-click the template and choose pQ8+T|0x
* Open. You can then make changes to the template in the Source Editor. NE"fyX`
*/ OSk9Eb4ld
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package com.tot.count; 2_v>8B
import java.util.*; :"]ei@
/** $S{j}74[
* cIjsUqKa
* @author A4h/oMis
*/ g.s oNqt=
public class CountCache { \$"Xr
public static LinkedList list=new LinkedList(); CVp<SS(
/** Creates a new instance of CountCache */ HbVLL`06*
public CountCache() {} V;(LeuDH|
public static void add(CountBean cb){ #CmBgxg+M
if(cb!=null){ pT tX[CE
list.add(cb); XvY-C
} fO nvC*
} ;wrgpP3
} Jmx}r,j
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CountControl.java 3R {y68-S
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/* =oJiNM5_u
* CountThread.java X3yr6J[ ^
* gG>>ynn
* Created on 2007年1月1日, 下午4:57 AF6'JxG7
* ba13^;fm#
* To change this template, choose Tools | Options and locate the template under H=C;g)R
* the Source Creation and Management node. Right-click the template and choose P+h&tXZn8
* Open. You can then make changes to the template in the Source Editor. =@o}
*/ 63=m11Z4
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package com.tot.count; qzz'v
import tot.db.DBUtils; M5uN1*
import java.sql.*; !4:,,!T
/** oDa{HP\O]W
* TZg7BLfy
* @author _!7o
*/ ~l~g0J
public class CountControl{ ): 6d_g{2
private static long lastExecuteTime=0;//上次更新时间 .>n|#XK
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 bE~lc}%
/** Creates a new instance of CountThread */ PQ>JoRs
public CountControl() {} $'q(Z@
public synchronized void executeUpdate(){ nCU4a1rZ
Connection conn=null; L_,U*Jyo
PreparedStatement ps=null; jL SZ#H
try{ 0J~4
conn = DBUtils.getConnection(); ~@JC1+
conn.setAutoCommit(false); <h({+N
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7}k8-:a%
for(int i=0;i<CountCache.list.size();i++){ C#>C59
CountBean cb=(CountBean)CountCache.list.getFirst(); 43XuQg4
CountCache.list.removeFirst(); wG
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ps.setInt(1, cb.getCountId()); c3##:"wr
ps.executeUpdate();⑴ S J5kA`
//ps.addBatch();⑵
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} SCij5il%
//int [] counts = ps.executeBatch();⑶ 2B7&Ll\>
conn.commit(); )Yml'?V"
}catch(Exception e){ ?}[keSEh>
e.printStackTrace(); VM[8w`
} finally{ @d\F; o<
try{ "|if<hx+
if(ps!=null) { 3nO|A: t
ps.clearParameters(); n>WS@b/o
ps.close(); tF|bxXsZ
ps=null; h.*|4;
} N2>JG]G
}catch(SQLException e){} bb{+
DBUtils.closeConnection(conn); 8{C3ijR
} Tx*m
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} #82B`y<<y/
public long getLast(){ hlRE\YO&8R
return lastExecuteTime; Y{KJk'xN5W
} -MjRFa
public void run(){ AN@Vos
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long now = System.currentTimeMillis(); \"SI-`x
if ((now - lastExecuteTime) > executeSep) { w8qI7/
//System.out.print("lastExecuteTime:"+lastExecuteTime); ,v"A}g0"
//System.out.print(" now:"+now+"\n"); :Lx]`dSk
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Zu,f&smb
lastExecuteTime=now; *D,T}N
executeUpdate(); E'Bt1u
} W4<}w-AoEp
else{ *q
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 'g#GUSXfj
} {%
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} YdFC YSiS
} z2V!u\It
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 D)5wGp
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类写好了,下面是在JSP中如下调用。 "q$M\jK#V
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<% nB.p}k
CountBean cb=new CountBean(); ]arP6iN+
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); !duR7a
CountCache.add(cb); EO5Vg
out.print(CountCache.list.size()+"<br>"); gP3[=a"\
CountControl c=new CountControl(); )Ii=8etdv
c.run(); zy|hf<V
out.print(CountCache.list.size()+"<br>"); >97N
$
%>