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: 3bjCa\ "
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CountBean.java [McqwU/Q
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/* G"kX#k0S
* CountData.java _@gg,2
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* TXS`ey
* Created on 2007年1月1日, 下午4:44 D%c^j9' 1
* Wa.!eAe}
* To change this template, choose Tools | Options and locate the template under +aPe)U<t
* the Source Creation and Management node. Right-click the template and choose 5MZv!N
* Open. You can then make changes to the template in the Source Editor. pF8:?p['z
*/ dLwP7#r
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package com.tot.count; 5 wN)N~JE
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/** Yl?s^]SFU
* @~N"MsF3
* @author A )CsF
*/ hNgT/y8
public class CountBean { v)nv"o[
private String countType; 1&7?f
int countId; fb^R3wd$ff
/** Creates a new instance of CountData */ 3webAaO
public CountBean() {} QR8]d1+GV
public void setCountType(String countTypes){ @Gw]cm
this.countType=countTypes; $vYy19z
} hb/Z{T'
public void setCountId(int countIds){ ]VtP7Y
this.countId=countIds; -49I3&
} I3T;|;P7
public String getCountType(){ 6cbV[!BL
return countType; ]gv3|W
} e7&RZ+s#wZ
public int getCountId(){ f4NN?"W)
return countId; @KLX,1K
} b'R]DS{8
} ,pf\g[tz
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CountCache.java r;H#cMj
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/* w-v8P`V
* CountCache.java p<l+js(5|
* S==0/
* Created on 2007年1月1日, 下午5:01 2_?VR~mA#
* 6Rq +=X
* To change this template, choose Tools | Options and locate the template under *UN*&DmF
* the Source Creation and Management node. Right-click the template and choose AOTtAV_e
* Open. You can then make changes to the template in the Source Editor. 'CG% PjCO
*/ mFd|JbW
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package com.tot.count; z>
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import java.util.*; YelF)Na
/** 6G_{N.{(
* ,1vFX$
* @author <0jM07\<
*/ s)sT\crP@
public class CountCache { .n?i'8
public static LinkedList list=new LinkedList(); IiX2O(*ZE
/** Creates a new instance of CountCache */ 8CvNcO;H0
public CountCache() {} nwDGzC~y<
public static void add(CountBean cb){ sc rss
if(cb!=null){ 'BVI ^H4
list.add(cb); 9'ky2
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} Q}g"pl
} 'loko#6
} 4v#s!W
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CountControl.java T@n};,SQ
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/* /-=h|A#Kh
* CountThread.java Kzwe36O;?
* }5B\:*yW
* Created on 2007年1月1日, 下午4:57 OY!WEP$F-C
* EKmn@S-&P
* To change this template, choose Tools | Options and locate the template under RE08\gNIt
* the Source Creation and Management node. Right-click the template and choose !;Pp)SRzKG
* Open. You can then make changes to the template in the Source Editor. s$^2Qp
*/ #jPn7
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package com.tot.count; ^RYq !l$
import tot.db.DBUtils; qtFHA+bO
import java.sql.*; 4"\%/kG
/** :kd]n$]
* 8wn{W_5a
* @author ;f}
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*/ |ZOdfr4uW
public class CountControl{ c Ze59
private static long lastExecuteTime=0;//上次更新时间 mo&9=TaG
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Ms-)S7tMz
/** Creates a new instance of CountThread */ pv"s!q&
public CountControl() {} Af`Tr6)
public synchronized void executeUpdate(){ er3`ITp:dp
Connection conn=null; @R (Op|9
PreparedStatement ps=null; NnaO!QW%
try{ xT!<x({
conn = DBUtils.getConnection(); QuC_sFP10
conn.setAutoCommit(false); be?Bf^O>
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); eDvh3Y<D
for(int i=0;i<CountCache.list.size();i++){ Z_[L5B]Gwd
CountBean cb=(CountBean)CountCache.list.getFirst(); (/X]9
CountCache.list.removeFirst(); h67{qY[J[
ps.setInt(1, cb.getCountId()); iU(B#ohW"
ps.executeUpdate();⑴ p8Z;QH*
//ps.addBatch();⑵ q4,/RZhzh
} F_4Et
//int [] counts = ps.executeBatch();⑶ U\M9sTqo
conn.commit(); t]?{"O1rC
}catch(Exception e){ }{Ra5-PY
e.printStackTrace(); 4t>"-/
} finally{ `7[!bCl
try{ mc{W\H
if(ps!=null) { ,LDL%<7t
ps.clearParameters(); "<^n@=g'q
ps.close(); JVr8O`>T
ps=null; Mc$rsqDz
} L!,@_
}catch(SQLException e){} }>V=J aG
DBUtils.closeConnection(conn); Ex
skd}
} 9<3fH J?vq
} hMUUnr"8;i
public long getLast(){ ]q4(%Q
return lastExecuteTime; +;M 5Sp
} =K}T; c
public void run(){ afzx?ekdF
long now = System.currentTimeMillis(); Ge7B%p8
if ((now - lastExecuteTime) > executeSep) { _x^rHADp
//System.out.print("lastExecuteTime:"+lastExecuteTime); uh \Tf5
//System.out.print(" now:"+now+"\n"); oJ`=ob4WDo
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); :{B']~Xf
lastExecuteTime=now; H4j1yD(d
executeUpdate(); TQ0ZBhd
} S.q0L
else{ ,KU%"{6
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); UBk:B
} {J,4g:4G
} a'.7)f[g}
} ]yL+lv
//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 =1'WZp}D5
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类写好了,下面是在JSP中如下调用。 Fw
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<% hZ!kh3@:`
CountBean cb=new CountBean(); GIn%yB'
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); p
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CountCache.add(cb); 5h0Hk<N
out.print(CountCache.list.size()+"<br>"); Ei\>gXTH1-
CountControl c=new CountControl(); iA[o;D#
c.run(); 7YK6e
out.print(CountCache.list.size()+"<br>"); uXLZ!LJo
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