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: l3sF/zkH
wkM1tKhy/
CountBean.java .26mB
Xr
K f/[Edn
/* ~.aR=m\#
* CountData.java 4T31<wk
* gom!dB0J
* Created on 2007年1月1日, 下午4:44 (da`aRVDp
* =SXdO)%2
* To change this template, choose Tools | Options and locate the template under F%h3?"s
* the Source Creation and Management node. Right-click the template and choose M@R"-$Z
* Open. You can then make changes to the template in the Source Editor. G9f6'5 O
*/ eCYPd-d
Fp/{L
package com.tot.count; "iA0hA
3]l)uoNt/
/** ~ubvdQEW
* [3jJQ3O,
* @author F{0\a;U@^
*/ g}NO$?ndg
public class CountBean { %"0, o$
private String countType; "E(i<
int countId; Wd:pqhLh
/** Creates a new instance of CountData */ umIGI
public CountBean() {} bZ\R0[0
public void setCountType(String countTypes){ s0/O/G?
this.countType=countTypes; $D1ha CL
} UJL2IF-x
public void setCountId(int countIds){ 1uAjy(y
this.countId=countIds; :j]1wp+
} C(ij_>
public String getCountType(){ E`.xu>Yyj
return countType; s*k)h,\
} 2#>;cn\
public int getCountId(){ hZx&j{
return countId; z:>cQUYl
} 2aj1IBnz6/
} _~z
oMdT!
*4}_2"[
CountCache.java ~w?02FU
fzIs^(:fl
/* ; ~pgF_
* CountCache.java |-Uh3WUE6
* J#I RbO)
* Created on 2007年1月1日, 下午5:01 B&]`OO>O
* M7TLQqaF
* To change this template, choose Tools | Options and locate the template under `,qft[1
* the Source Creation and Management node. Right-click the template and choose (QDKw}O2b
* Open. You can then make changes to the template in the Source Editor. !;eE7xn &
*/ F\ B/q
=rA?,74
package com.tot.count; $*ff]>#
import java.util.*; 4j={ 9e<
/** V4[-:k
* 'z ?Hv
* @author x4WCAqi/2
*/ z`zz8hK.
public class CountCache { geme_
public static LinkedList list=new LinkedList(); eFG/!b<17
/** Creates a new instance of CountCache */ n 9B5D:.G
public CountCache() {} fpR|+`k
public static void add(CountBean cb){ PVI Oe}N
if(cb!=null){ QTy=VLk43
list.add(cb); <T}^:2G|
} |J-X3`^\H
} .9bi%=hP
} V&*IZt&
,8e'<y
CountControl.java `HX:U3/
dua F?\vv
/* %e~xO x
* CountThread.java {<42PJtPY
* d4| )=
* Created on 2007年1月1日, 下午4:57 g-eJan&]N
* 5W&L6.J}+
* To change this template, choose Tools | Options and locate the template under j%6p:wDl
* the Source Creation and Management node. Right-click the template and choose ]SQ+r*a
* Open. You can then make changes to the template in the Source Editor. fx;rMGa
*/
@ap!3o8,9
dKzG,/1W[m
package com.tot.count; @IL04' \
import tot.db.DBUtils; wlXs/\es
import java.sql.*; ]l,D,d81
/** "^#O7.oVi+
* zjmoIE
* @author P~j#8cH7
*/ B4y_{V
public class CountControl{ Fi i(dmn
private static long lastExecuteTime=0;//上次更新时间 3"h*L8No
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 p*Z<DEh#
/** Creates a new instance of CountThread */ y!b2;- Dp
public CountControl() {} I~&*^q6 |
public synchronized void executeUpdate(){ GHsDZ(d3.
Connection conn=null; s<!A<+Sh
PreparedStatement ps=null; JWNN5#=fQ
try{ WZ'<iI
conn = DBUtils.getConnection(); Jh-yIk
conn.setAutoCommit(false); E=I'$*C\D
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }>{R<[I!G
for(int i=0;i<CountCache.list.size();i++){ w){B$X
CountBean cb=(CountBean)CountCache.list.getFirst(); xrf|c
CountCache.list.removeFirst(); LeCc`x,5
ps.setInt(1, cb.getCountId()); rS [4Pey
ps.executeUpdate();⑴ Y/sav;
//ps.addBatch();⑵ 'gY?=,dF>
} "Hw%@]#
//int [] counts = ps.executeBatch();⑶ RdX+:!lD
conn.commit(); NfoHQU<n
}catch(Exception e){ MSCH6R"5
e.printStackTrace(); \l/(L5gY
} finally{ jwI2T$
try{ Q`k;E}x_-
if(ps!=null) { JN8Rh
ps.clearParameters(); aT,WXW*
ps.close(); y4kn2Mw;
ps=null; 7J);{ &x9h
} bW`nLiw}%
}catch(SQLException e){} wq?"NQ?O<
DBUtils.closeConnection(conn); k6#$Nb606
} e|tx`yA
} jkk%zu
public long getLast(){ zZMKgFR@
return lastExecuteTime; O ~5t[
} D"4*l5l
public void run(){ ?8O5%IrJ
long now = System.currentTimeMillis(); g:!U,<C^a
if ((now - lastExecuteTime) > executeSep) { (-S^L'v62v
//System.out.print("lastExecuteTime:"+lastExecuteTime); !j $cBf4
//System.out.print(" now:"+now+"\n"); a4s't%
P
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); \|>%/P
lastExecuteTime=now; lat5n&RP Y
executeUpdate(); n.l#(`($4
} /`m*PgJ
else{ ;Rv WF )
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Q&I #
} Uh0g !zzp
} }XUL\6 U
} wqG#jC!5
//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 &k'<