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: js$a^6
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CountBean.java Yi! >8
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/* (2a"W`
* CountData.java ]9l%
* $9u
* Created on 2007年1月1日, 下午4:44 I}CA-8
* q2o$s9}B
* To change this template, choose Tools | Options and locate the template under oKqFZ,m[
* the Source Creation and Management node. Right-click the template and choose %l$&_xV-
* Open. You can then make changes to the template in the Source Editor. P+c Fp7nC
*/ pkMON}"mj
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package com.tot.count; =;?PVAdu%#
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/** i)^ZH#Gp
* ?@ye*%w_
* @author F/,<dNJ
*/ M:q;z(
public class CountBean { SbNU X
private String countType; ,0u0 '
int countId; &JQ@(w
/** Creates a new instance of CountData */ af5`ktx
public CountBean() {} k=/|?%
public void setCountType(String countTypes){ kIZdND&
this.countType=countTypes; 2n r
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} ^cXL4*_=
public void setCountId(int countIds){ &!EYT0=>p
this.countId=countIds; uF|ix.R6
} zNTu j p
public String getCountType(){ Xv(9 YhS
return countType; sNpBTG@{l
} 3B|-xq;]I
public int getCountId(){ z7}zf@Y-qv
return countId; KO;6 1y:
} av$_hEjo|D
} r4>I?lD
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CountCache.java zi&d
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/* NjyIwo0
* CountCache.java 5K-)X9z?
* @ BW8`Ky1
* Created on 2007年1月1日, 下午5:01 g>-[-z$E3
* c\ *OId1{;
* To change this template, choose Tools | Options and locate the template under ti2_kYq
* the Source Creation and Management node. Right-click the template and choose n\p\*wb
* Open. You can then make changes to the template in the Source Editor. EQhV}9
*/ j7 3@Yi%
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package com.tot.count; */e5lRO\
import java.util.*; 25[/'7_"
/** <|G~S<y}
* m
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* @author 0>MI*fnY"
*/ zQ+t@;g1
public class CountCache { #Kr.!uD
public static LinkedList list=new LinkedList(); j7+t@DqQ
/** Creates a new instance of CountCache */ u@'zvkb@
public CountCache() {} O;sQPG,v
public static void add(CountBean cb){ .4(f0RG
if(cb!=null){ Y"%o\DS*
list.add(cb); Y/(-mcR
} 5z>\'a1U
} D.!7jA#
} ]*U')
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CountControl.java _?c.3+;s
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/* "?,6{\y,
* CountThread.java c/U6K
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* Z$XpoDbOy
* Created on 2007年1月1日, 下午4:57 mhuaXbr
* y]9UFL"
* To change this template, choose Tools | Options and locate the template under }O
* the Source Creation and Management node. Right-click the template and choose ptQ(7N
* Open. You can then make changes to the template in the Source Editor. PlUjjJU
*/ W10fjMC}^
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package com.tot.count; `aycYoD
import tot.db.DBUtils; TMsoQ82
import java.sql.*; r ngw6?`n-
/** ii9/ UtIQ
* Ti'kn{
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* @author vDvGT<d
*/ Y1\vt+`O
public class CountControl{ w%n]~w=8
private static long lastExecuteTime=0;//上次更新时间 eMzCAO
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 "M &4c:cz
/** Creates a new instance of CountThread */ :5J6rj;_
public CountControl() {} qKC*jDW
public synchronized void executeUpdate(){ ZRfa!9vl
Connection conn=null; 1}*;
PreparedStatement ps=null; Q$j48,e
try{ "|SE#k
conn = DBUtils.getConnection(); t7FQ.E,T
conn.setAutoCommit(false); ;i>E@
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); jF9CTL<
for(int i=0;i<CountCache.list.size();i++){ edx'p`%d5
CountBean cb=(CountBean)CountCache.list.getFirst(); ^mQfXfuL
CountCache.list.removeFirst(); yw!`1#3.
ps.setInt(1, cb.getCountId()); F JhVbAMd
ps.executeUpdate();⑴ GR
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//ps.addBatch();⑵ z?[DW*
} Al}PJz\
//int [] counts = ps.executeBatch();⑶ 0 +LloB
conn.commit(); G|_aU8b|t
}catch(Exception e){ kELyD(^P`
e.printStackTrace(); K~T\q_ZPZ
} finally{ ^^uD33@_
try{ &S]v+wF
if(ps!=null) { ]5/U}Um
ps.clearParameters(); /GGu` f
ps.close(); 8ZfIh
ps=null; ZQA
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} ifZNl,
}catch(SQLException e){} -74T C
DBUtils.closeConnection(conn); U:hC!t:
} |Eu~=J7@
} 8Oh3iO
public long getLast(){ ped Yf{T
return lastExecuteTime; XtdLKYET
} |LH*)GrD*t
public void run(){ %tQ{Hf~
long now = System.currentTimeMillis(); ,5*xE\9G
if ((now - lastExecuteTime) > executeSep) { _\PoZ|G4y
//System.out.print("lastExecuteTime:"+lastExecuteTime); >]8.xkQq
//System.out.print(" now:"+now+"\n"); L-{r*ccIW
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); /j@ `aG(a
lastExecuteTime=now; {`CWzk?
executeUpdate(); 2tm-:CPG
} F*:NKT d
else{ Gi4dgMVei
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); J5( D7rp#
} ODA#vAc!
} B?Sfcq-
} 2!?z%s-S
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 /,$\H
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类写好了,下面是在JSP中如下调用。 % ul{nL:
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<% qFbUM;
CountBean cb=new CountBean(); 8w?\_P7QA
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); L b;vrh;A
CountCache.add(cb); LlY*r+Cgl1
out.print(CountCache.list.size()+"<br>"); <dPxy`_
CountControl c=new CountControl(); g_c)Ts(
c.run(); -8 =u{n
out.print(CountCache.list.size()+"<br>"); 8Flf,"a
%>