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: Ei2M~/
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CountBean.java lt'N{LFvc
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/* ]w*` }
* CountData.java a_VWgPVdDS
* @G>eCj
* Created on 2007年1月1日, 下午4:44 B)d 4]]4\\
* "Qc4v@~)
* To change this template, choose Tools | Options and locate the template under Jzp|#*~$E
* the Source Creation and Management node. Right-click the template and choose $BLd>gTzmv
* Open. You can then make changes to the template in the Source Editor. /&qE,>hd.+
*/ giIPK&
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package com.tot.count; @}r
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/** p")"t`k7
* UZ-pN_!Z:
* @author /Aw@26
*/ =yRv*C
public class CountBean { U0W2
private String countType; S6JWsi4C:,
int countId; #
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/** Creates a new instance of CountData */ Q"!GdKM
public CountBean() {} lkp$rJ#6
public void setCountType(String countTypes){ ^IvQdVB
this.countType=countTypes; 0<<ATw$aQ
} 9%Vy,
public void setCountId(int countIds){ _9=cxwi<w
this.countId=countIds; !u:;Ew
} '19?
public String getCountType(){ ([SJ6ff]&
return countType; vwAhNw2-
} 2/F8kVx{
public int getCountId(){ '"hSX=
return countId; ;i [;%
} IW}Wt{'m
} @eESKg(,
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CountCache.java t8lGC R
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/* "fN
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* CountCache.java oBnes*
*
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* Created on 2007年1月1日, 下午5:01 qx0F*EH|
* 1'\s7P
* To change this template, choose Tools | Options and locate the template under -) +B!"1
* the Source Creation and Management node. Right-click the template and choose t,A=B(W
* Open. You can then make changes to the template in the Source Editor. g^#,!e
*/ J_<6;#
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package com.tot.count; 4qd(a)NdY
import java.util.*; pFBK'NE
/** UsCaO<A
* 150x$~{/
* @author (6
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*/ A&jR-%JG
public class CountCache { e?o/H
public static LinkedList list=new LinkedList(); p&2d&;Qo0
/** Creates a new instance of CountCache */ (_N(K`4#W
public CountCache() {} U9\w)D|+eE
public static void add(CountBean cb){ DdeKZ)8
if(cb!=null){ <&((vrfa
list.add(cb); 3/c%4b.Z
} ts,V+cEA
} *k?y+}E_f
} M`*
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CountControl.java JPZH%#E(
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/* @'Pay)P
* CountThread.java tHM0]Gb}
* tu;Pm4q7
* Created on 2007年1月1日, 下午4:57 <a+@4d;
* B<G,{k
* To change this template, choose Tools | Options and locate the template under w)R5@
@C*
* the Source Creation and Management node. Right-click the template and choose Zx: h)I
* Open. You can then make changes to the template in the Source Editor. j(>xP*il
*/ [{>1wJ Pdj
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package com.tot.count; .E7"Lfs-
import tot.db.DBUtils; MlbcJo3
import java.sql.*; Z(LTHAbBk|
/** <<Z, 1{3F
* >$a;+v
* @author \lwLVe
*/ $:A80(#+
public class CountControl{ 7e#|Iq:o
private static long lastExecuteTime=0;//上次更新时间 C/9]TkX}q
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 e)XnS '
/** Creates a new instance of CountThread */ 3m &
public CountControl() {} {DUtdu[
public synchronized void executeUpdate(){ u&o$2
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Connection conn=null; [;~"ctf{
PreparedStatement ps=null; nuA
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try{ *q[;-E(fZ#
conn = DBUtils.getConnection(); eq<!
conn.setAutoCommit(false); .Ep&O#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >V\^oh)t]t
for(int i=0;i<CountCache.list.size();i++){ |GP&!]
CountBean cb=(CountBean)CountCache.list.getFirst(); 5-&"nn2*}1
CountCache.list.removeFirst(); *|@386\
ps.setInt(1, cb.getCountId()); $e uI
ps.executeUpdate();⑴ PY+4OZ$
//ps.addBatch();⑵ mGJRCK_
} "];@N!dA
//int [] counts = ps.executeBatch();⑶ z'"Y+EWN
conn.commit(); 1FT3d
}catch(Exception e){ Pl2eDv-y
e.printStackTrace(); );n/G
} finally{ *!dA/sid
try{ zXbA$c
if(ps!=null) { cHOC>|
ps.clearParameters(); *=T(ncR['
ps.close(); Nn U`u.$D
ps=null; vWa\8y f
} h 'Hnq m
}catch(SQLException e){} % w
DBUtils.closeConnection(conn); Fw}|c
} uaky2SgN
} dI!/H&`B]
public long getLast(){ 6mgLeeY
return lastExecuteTime; *{\))Zmhd
} (<e<Q~(
public void run(){ MY}K.^4^
long now = System.currentTimeMillis(); jCIY(/
if ((now - lastExecuteTime) > executeSep) { 1i)3!fH0:
//System.out.print("lastExecuteTime:"+lastExecuteTime); Jz P0D'
//System.out.print(" now:"+now+"\n"); Cbm^:
_LR
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); aEVy20wd
lastExecuteTime=now; {.y_{yWo
executeUpdate(); C46jVl
} H(y Gh
else{ Tb8r+~HK
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
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} 64>CfU(
} #5{BxX&\
} MpIiHKQ
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//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 lXzm)
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类写好了,下面是在JSP中如下调用。 _c5*9')-)
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<% Wu8^Z Z{
CountBean cb=new CountBean(); ]e+&Pxw]e
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); XGjFb4Tw7
CountCache.add(cb); QBN\wL8g
out.print(CountCache.list.size()+"<br>"); v53|)]V
CountControl c=new CountControl(); JZ&_1~Z=
c.run(); (Q8r2*L
out.print(CountCache.list.size()+"<br>"); #l3)3k*;
%>