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: 2k5/SV
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CountBean.java :a0zT#u
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/* "G?Yrh
* CountData.java d
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* }dYBces
* Created on 2007年1月1日, 下午4:44 2+Rv{%
* L{&U V0q!
* To change this template, choose Tools | Options and locate the template under ~*.-
* the Source Creation and Management node. Right-click the template and choose '@=PGpRF
* Open. You can then make changes to the template in the Source Editor. T!|=El>
*/ #07!-)Gv
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package com.tot.count; /+|#^:@
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/** !{%&=tIZ
* ](jFwxU
* @author OW@\./nM
*/ '0Q,
public class CountBean {
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private String countType; HM9fjl[
int countId; ,"2TArC'z
/** Creates a new instance of CountData */ ~E5z"o6$
public CountBean() {} D Ml?o:l
public void setCountType(String countTypes){ >m6&bfy\q
this.countType=countTypes; @)6jE!LC
} O7G"sT1Dv
public void setCountId(int countIds){ k cuzB+
this.countId=countIds; =E*Gb[r_7
} Y.6SOu5$]
public String getCountType(){ ~AB*]Us
return countType; \jU |(DE
} O XP\R
public int getCountId(){ >3.X?
return countId; tJ0NPI56yP
} cr;`Tl~}s
} +^|iZbZKx
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CountCache.java r'7LR
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/* PoSpkJH
* CountCache.java !|Q5Zi;aX7
* >QkP7Kb
* Created on 2007年1月1日, 下午5:01 ci9R.U)
* #q\x$
* To change this template, choose Tools | Options and locate the template under K`-!uZW:B7
* the Source Creation and Management node. Right-click the template and choose F7*wQ{~
* Open. You can then make changes to the template in the Source Editor. #]Y>KX2HG
*/ mN_Z7n;^eh
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package com.tot.count; #FxPj-3(ix
import java.util.*; jM)C4ii.-$
/** yV_wDeAz
* A!i q->+
* @author LW)H"6v
*/ 9ooY?J
public class CountCache { {Qu"%h.Al
public static LinkedList list=new LinkedList(); 2}U!:bn(
/** Creates a new instance of CountCache */ jNDx,7F-
public CountCache() {} yHo[{,4itA
public static void add(CountBean cb){ GEUg]nw
if(cb!=null){ w?Ju5 5
list.add(cb); R9+jW'[K
} PJ4(}a
} @~td`Z?1y
} *Mc7f ?H
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CountControl.java c]k*}W3T
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/* {-/^QX]6
* CountThread.java "/{RhY<
* NQHz<3S[
* Created on 2007年1月1日, 下午4:57 8jlLUG:g
* Z~
* To change this template, choose Tools | Options and locate the template under 4'1m4Ugg
* the Source Creation and Management node. Right-click the template and choose /b#l^x:j
* Open. You can then make changes to the template in the Source Editor. >w6taX
*/ >o,^b\
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package com.tot.count; ),:c+~@@kT
import tot.db.DBUtils; ~Heb1tl;
import java.sql.*; rZXrT}Xh{W
/** 2S[-$9
* `_ %S
* @author HeGYu?&
*/ 6?tlU>A2s
public class CountControl{ 68fiG
private static long lastExecuteTime=0;//上次更新时间 G"5D< ]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Lo.rvt
/** Creates a new instance of CountThread */ 5Z/7kU=I
public CountControl() {} T4/fdORS
public synchronized void executeUpdate(){ SMr13%KN/
Connection conn=null; :nN1e
PreparedStatement ps=null; W*DVi_\$y
try{ CBYX]
conn = DBUtils.getConnection(); PQmq5N6
conn.setAutoCommit(false); 75T_Dx(H
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); G6P)C##ibn
for(int i=0;i<CountCache.list.size();i++){ ji1HV1S
CountBean cb=(CountBean)CountCache.list.getFirst(); {PU!=IkTS
CountCache.list.removeFirst(); 'wasZ b<^
ps.setInt(1, cb.getCountId()); UB`ToE|Ii
ps.executeUpdate();⑴ Df=dt
//ps.addBatch();⑵ YV% 5y1i
} hOv={:
//int [] counts = ps.executeBatch();⑶ PC$CYW5
conn.commit(); rHge~nY<
}catch(Exception e){ J@pb[O L,
e.printStackTrace(); (:V>Hjt
} finally{ +ECDD'^!
try{ :,12")N
if(ps!=null) { %q;jVj[
ps.clearParameters(); }kHdK vZ
ps.close(); ^)!F9h+
ps=null; ^$>XW\yCs
} eK_*2=;XRW
}catch(SQLException e){} Qp,DL@mp>8
DBUtils.closeConnection(conn); `N//A}9
} cLa]D[H
} pL=d% m.W
public long getLast(){ mMx ;yZ
return lastExecuteTime; )4U>!KrY
} w.\w1:d
public void run(){ -{XRA6
long now = System.currentTimeMillis(); O`GsS{$sS
if ((now - lastExecuteTime) > executeSep) {
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//System.out.print("lastExecuteTime:"+lastExecuteTime); s&kQlQ=
//System.out.print(" now:"+now+"\n"); kv,%(en]
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); hVT~~n`Rj
lastExecuteTime=now; bi y4d
executeUpdate(); F;ZSzWq
} ,d+fDmm3
else{ zJDSbsc$%
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); N /$`:8"
} =o}"jVE
} .MW@;
} &;,,H< p
//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(Y7mM8\
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类写好了,下面是在JSP中如下调用。 `!:q;i]}
1% F?B-k
<% r"2V
CountBean cb=new CountBean(); 7'-Lp@an
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Qp"y?S
CountCache.add(cb); 4to% `)]
out.print(CountCache.list.size()+"<br>"); ne61}F"E
CountControl c=new CountControl(); -!;l~#K=
c.run(); /){KOCBl;
out.print(CountCache.list.size()+"<br>"); ,oxcq?7#4
%>