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: MTQdyTDHl
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CountBean.java vwg\qKqSM
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/* V%+KJ}S!Z
* CountData.java FD8aO?wvg
* E+_}8J .
* Created on 2007年1月1日, 下午4:44 "8N]1q:$4
* -?ip ?[Z
* To change this template, choose Tools | Options and locate the template under 5 p750`n
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. A%Ao yy4E
*/ NLj0\Pz|B
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package com.tot.count; c~cYN W:
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/** _A(J^;?
* ,ihTEw,t(
* @author a/_ `1
*/ 3Z`oI#-x
public class CountBean { .DT1Jvl
private String countType; pB )nQ5l'
int countId; |_-FQ~Hf F
/** Creates a new instance of CountData */ [scPs,5Y
public CountBean() {} 2o,%O91p
public void setCountType(String countTypes){ ^<<
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this.countType=countTypes; ^LZU><{';
} "jy'Dpy0m
public void setCountId(int countIds){ z19y>j
this.countId=countIds; +* &!u=%G
} \2T@]!n
public String getCountType(){ X(/W|RY{@
return countType; >kd2GZe^_J
} FG'1;x!
public int getCountId(){ Ek84yme#
return countId; W}KtB1J
} .n"aQ@!
} e-Eoe_k
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CountCache.java e+S%`Sg
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/* a7Z PV1k
* CountCache.java kfn5y#6NZ
* k;"=y)@o
* Created on 2007年1月1日, 下午5:01 Z_S~#[\7^]
* >RRb8=[J
* To change this template, choose Tools | Options and locate the template under Rj-<tR{
* the Source Creation and Management node. Right-click the template and choose ]NN9FM.2b/
* Open. You can then make changes to the template in the Source Editor. gXG1w>
*/ C8i}~x<
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package com.tot.count; FFPO?y$
import java.util.*; T*z >A
/** O||M
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* I#m5Tl|#
* @author "= HCP,
*/ :H6Ipa
public class CountCache { sz_|py?0
public static LinkedList list=new LinkedList(); JVU:`BH
/** Creates a new instance of CountCache */ V\Rbnvq
public CountCache() {} >0{{loqq
public static void add(CountBean cb){ T-eeYw?Yf
if(cb!=null){ Cdc6<8
list.add(cb); faThXq8B
} D guAeK
} eEXer>Rm
} Q[S""P.Z|
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CountControl.java EI]NOG 0
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/* JhIgqW2
* CountThread.java S's\M5
* 7\eN8+
* Created on 2007年1月1日, 下午4:57 -k=02?0p+
* we!}"'E;
* To change this template, choose Tools | Options and locate the template under R9~%ORI#;
* the Source Creation and Management node. Right-click the template and choose ?HttqK)
* Open. You can then make changes to the template in the Source Editor. rk{DrbRx
*/ <1>\?$)D
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package com.tot.count; RD<l<+C^~
import tot.db.DBUtils; UuW"
import java.sql.*; Ydh]EO0'
/** 36e!je
* #"=_GA^.{
* @author "^yTH/m
*/ g*TAaUs|n
public class CountControl{ 6;k#|-GU&
private static long lastExecuteTime=0;//上次更新时间 $s$z"<
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 hC=9%u{r?
/** Creates a new instance of CountThread */ V07e29w
public CountControl() {} BJwPSKL
public synchronized void executeUpdate(){ t=Tu-2,k
Connection conn=null; ]HCu tq
PreparedStatement ps=null; zaf%%
try{ S8^W)XgC;
conn = DBUtils.getConnection(); D^$Nn*i;U
conn.setAutoCommit(false); lt[{u$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); "8>*O;xk
for(int i=0;i<CountCache.list.size();i++){ Ns?y)
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CountBean cb=(CountBean)CountCache.list.getFirst(); W/OZ}ky}^
CountCache.list.removeFirst(); ](vOH#E
ps.setInt(1, cb.getCountId()); 1^TOTY
ps.executeUpdate();⑴ .|;`qUo
//ps.addBatch();⑵ weYP^>gH'
} ?>LsIPa
//int [] counts = ps.executeBatch();⑶ I#tn/\n
conn.commit(); ;"Q{dOvp
}catch(Exception e){ ;J Fy
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e.printStackTrace(); xQ=[0!p+
} finally{ ^
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try{ G$<FQDvs
if(ps!=null) { p
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ps.clearParameters(); Tj$D:xKf)
ps.close(); =rFgOdj
ps=null; 3FR'N%+
} <sE0426
{
}catch(SQLException e){} @.6l^"L
DBUtils.closeConnection(conn); c%n[v3]
} <H::{
} !7]4sXL{
public long getLast(){ 80U07tJ
return lastExecuteTime; LzEs_B=9
} >LRt,.hy6
public void run(){ :)_Ap{9J
long now = System.currentTimeMillis(); X!Xl
if ((now - lastExecuteTime) > executeSep) { ?KDI'>"-v
//System.out.print("lastExecuteTime:"+lastExecuteTime); LS}dt?78`V
//System.out.print(" now:"+now+"\n"); /:iO:g1
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
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lastExecuteTime=now; ZaBGkDX5
executeUpdate(); 3iMh)YH5b
} sg RY`U.C
else{ ZnVi.s~1V
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); pj4M|'F7
} X`YA JG
} B[w~bW|K
} zc%#7"FM
//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 &W)Lzpx8c
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类写好了,下面是在JSP中如下调用。 apPn>\O
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<% ~_OtbNj#
CountBean cb=new CountBean(); zZE
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); R/&Bze
CountCache.add(cb); ,{!~rSq-l
out.print(CountCache.list.size()+"<br>"); Z<T%:F
CountControl c=new CountControl(); Ke@zS9
c.run(); #Y6'Q8gf
out.print(CountCache.list.size()+"<br>"); #0V$KC*>
%>