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: ac%%*HN,
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CountBean.java iD+Q\l;%
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/* Cy-q9uTm
* CountData.java ~9c?g(0
* K-(k6<h
* Created on 2007年1月1日, 下午4:44 pv*u[ffi
* sJo]$/?F
* To change this template, choose Tools | Options and locate the template under l&2A]5C
* the Source Creation and Management node. Right-click the template and choose &0Yv*,4]
* Open. You can then make changes to the template in the Source Editor. v1%rlP
*/ #ak2[UOT
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package com.tot.count; G&$+8r
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/** CKwrE]h
* .^j 6
* @author E/z^~;KA
*/ g]?&qF}
public class CountBean { ]Tk3@jw+b
private String countType; YSERQo
int countId; LN}eD\
/** Creates a new instance of CountData */ *X- 6]C
public CountBean() {} pwAawm
public void setCountType(String countTypes){ K0$8t%Z.
this.countType=countTypes; O* `v1>
} 17g\XC@ Cl
public void setCountId(int countIds){ VL=. JwK
this.countId=countIds; 5q?2?j/h
} !wy
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public String getCountType(){ ~?i;~S
return countType; 5VIc
} ZYDLl8
public int getCountId(){ J%`-K"NB
return countId; ?oF+?l
} Im7<\ b@
} 1vKc>+9
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CountCache.java :L gFd
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/* iIWz\FM
* CountCache.java 8q9HQ4dsL
* L1=+x^WQ
* Created on 2007年1月1日, 下午5:01 NH&/=
* i}teY{pyc
* To change this template, choose Tools | Options and locate the template under }z{2~ 0,
* the Source Creation and Management node. Right-click the template and choose d,kh6'g2@
* Open. You can then make changes to the template in the Source Editor. _~V7m
*/ lnuf_;0
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package com.tot.count; V5w00s5?%
import java.util.*; c'M#va
/** jo 0
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* +vOlA#t%Z
* @author &)`xlIw}
*/ tPu0r],`o
public class CountCache { zAT7^q^
public static LinkedList list=new LinkedList(); IvuKpX>*
/** Creates a new instance of CountCache */ 7<{g+Q~7*
public CountCache() {} 9))E\U
public static void add(CountBean cb){ xs+pCK |
if(cb!=null){ _'pow&w~
list.add(cb); Q72}V9I9
} `4^-@}
} thG;~W
} :|cC7,S
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CountControl.java %04N"^mT'~
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/* vv='.R, D
* CountThread.java DmDsn
* &o{=
* Created on 2007年1月1日, 下午4:57 *12,MO>go
* R@*mMWW,
* To change this template, choose Tools | Options and locate the template under 5G5P#<Vv
* the Source Creation and Management node. Right-click the template and choose 1, 5"sQ$
* Open. You can then make changes to the template in the Source Editor. b4NUx)%ln
*/ Wp2b*B=-
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package com.tot.count; k?(x}IZdG
import tot.db.DBUtils; j7L uN
import java.sql.*; @9-/p^n1
/** \HR<^xY
* >q W_%
* @author X|o;*J](
*/ J<K-Yeph
public class CountControl{ 3FWl_d~uD
private static long lastExecuteTime=0;//上次更新时间 -M]NdgI
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 uu08q<B5b)
/** Creates a new instance of CountThread */ %V r vu5
public CountControl() {} 06hzCWm#
public synchronized void executeUpdate(){ hC1CISm.U
Connection conn=null; CM$q{;y
PreparedStatement ps=null; .MNi)+
try{ D@jG+k-Lm
conn = DBUtils.getConnection(); ;%-f>'KhI7
conn.setAutoCommit(false); j_=A)B?
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 6yDc4AX
for(int i=0;i<CountCache.list.size();i++){ :exgdm;N
CountBean cb=(CountBean)CountCache.list.getFirst(); #&Xr2?E@
CountCache.list.removeFirst(); &yu3nA:7D
ps.setInt(1, cb.getCountId()); SVr3OyzI
ps.executeUpdate();⑴ z^@.b
//ps.addBatch();⑵ =m<; Jx5
} 7d9kr?3(U
//int [] counts = ps.executeBatch();⑶ ~3]ZN'b\
conn.commit(); +TA'P$j
}catch(Exception e){ p]/qf\E
e.printStackTrace(); !_zp'V]?
} finally{ T{9pNf-
try{ /g|H?F0
if(ps!=null) { E;$;g#ksf
ps.clearParameters(); I+qg'mo
ps.close(); rE:"8d}z
ps=null; +Ce[OG.
} 1|]IWX|
}catch(SQLException e){} 2Fi~GY_
DBUtils.closeConnection(conn);
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} "6[a%f#Q
} ,r$k79TI
public long getLast(){ ;m/h?Y~
return lastExecuteTime; X@ zw;Se
} " Bz\<e&u
public void run(){ |rjHH<
long now = System.currentTimeMillis(); ].=~C"s,a
if ((now - lastExecuteTime) > executeSep) { =r w60B
//System.out.print("lastExecuteTime:"+lastExecuteTime); )K=%s%3h<
//System.out.print(" now:"+now+"\n"); x,U'!F
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); A*1-2
lastExecuteTime=now; tHhau.!
executeUpdate(); 'H19@b5rx
} pUGFQ."\
else{ zmA]@'j
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); xz$-_NWW
} -<g&U*/E
} S]}hh,A
} OouIV3
//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 I_/E0qSJI
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类写好了,下面是在JSP中如下调用。 kp6{QKDj&
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<% m;_gNh8 Ee
CountBean cb=new CountBean(); 0XcH
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); cEdf&*_-'I
CountCache.add(cb); l i @:
out.print(CountCache.list.size()+"<br>"); e9LP!"@EY
CountControl c=new CountControl(); <Ny DrO"C3
c.run(); [NxC7p:Lo
out.print(CountCache.list.size()+"<br>"); 6UAn#d9
%>