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: Jpg_$~k
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CountBean.java 1 6;l,@
* 2[&26D
/* mXlXB#N
* CountData.java AbUU#C7
* 8OH<ppi
* Created on 2007年1月1日, 下午4:44 ASY
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* /k<*!H]KSg
* To change this template, choose Tools | Options and locate the template under eHK}U+"\
* the Source Creation and Management node. Right-click the template and choose \<|a>{`7]i
* Open. You can then make changes to the template in the Source Editor. =bs4*[zq
*/ F3jrJ+nJ
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package com.tot.count; &=fBqod
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/** PN/2EmwtC
* F`8A!|cIy
* @author RyD2LAf)J
*/ DamLkkoA
public class CountBean { &=|W95
private String countType; w3Aq[1U0
int countId; 9pE)S^P
/** Creates a new instance of CountData */ %8`zaa
public CountBean() {} 95(c{
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public void setCountType(String countTypes){ GiHJr1
this.countType=countTypes; ^i&Qr+v
} )ZzwD]
public void setCountId(int countIds){ Z]$yuM
this.countId=countIds; Cih}
} N;A1e@bP
public String getCountType(){ rsBF\(3b~
return countType; e;x`C
} G,{L=xOh
public int getCountId(){ FU!U{qDI
return countId; V)R-w`
} GK/a^[f+'l
} o]n5pZ\\W<
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CountCache.java R8EDJ2u#
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/* GEA@AD=^f
* CountCache.java %xxe U
* Bp^>R`,
* Created on 2007年1月1日, 下午5:01 d(,-13
* ;knSn$
* To change this template, choose Tools | Options and locate the template under ,!kyrk6
* the Source Creation and Management node. Right-click the template and choose [rTV)JsTb
* Open. You can then make changes to the template in the Source Editor. i3: sV 5
*/ r!Eo8C
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package com.tot.count; {ZbeF#*"
import java.util.*; ~FZLA}
/** \_@u"+,$W
* w|Zq5|[
* @author aEXV^5;,pJ
*/ $f1L<euH
public class CountCache { DetBZ.
public static LinkedList list=new LinkedList(); a&L8W4
/** Creates a new instance of CountCache */ ""Drf=]
public CountCache() {} 1>a^Q
public static void add(CountBean cb){ ;}f%b E
if(cb!=null){ ^!{oyw
list.add(cb); 9<7Q {
} $0LlaN@e
} a9QaF s"
} @pytHN8( $
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CountControl.java -#<,i'
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/* ]*i>KR@G
* CountThread.java VmBLNM?
* HxZ4t
* Created on 2007年1月1日, 下午4:57 1b6gTfU
* 2: pq|eiF
* To change this template, choose Tools | Options and locate the template under lBQ|=
* the Source Creation and Management node. Right-click the template and choose EXa6"D
* Open. You can then make changes to the template in the Source Editor. D:n0dfPU
*/ wk9tJ#}
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package com.tot.count; %Pa-fee
import tot.db.DBUtils; /6gRoQ%j
import java.sql.*; 5R"b1
/** 9D<^)ShY
* i;|%hDNWA
* @author sE/9~L
*/ Y%=A>~s*c:
public class CountControl{ }=f}@JlFB
private static long lastExecuteTime=0;//上次更新时间 =PZs'K
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 /E]4N=T
/** Creates a new instance of CountThread */ RtqW!ZZ:H
public CountControl() {} zLxWyPM0;
public synchronized void executeUpdate(){ )@K|Co
Connection conn=null; ;quGy3
PreparedStatement ps=null; x,7axx6
try{ Zfb:>J@h6
conn = DBUtils.getConnection(); ]/$tt@h
conn.setAutoCommit(false); aY {.
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); zG@!(
for(int i=0;i<CountCache.list.size();i++){ Fa/i./V2
CountBean cb=(CountBean)CountCache.list.getFirst(); YF:NRY[i
CountCache.list.removeFirst(); zkd#vAY(A
ps.setInt(1, cb.getCountId()); 10[~ki-1;
ps.executeUpdate();⑴ OOk53~2id
//ps.addBatch();⑵ kW,yZ.?f
} 6=')*_~/
//int [] counts = ps.executeBatch();⑶ iww h,(
conn.commit(); RK'( {1
}catch(Exception e){ 2l!"OiB.P
e.printStackTrace(); v5 9>
} finally{ F~DG:x~
try{ r+lY9l
if(ps!=null) { u8W*_;%:
ps.clearParameters(); +s S*EvF
ps.close(); `r]Cd
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ps=null; w}(xs)`num
} /=3g-$o{`
}catch(SQLException e){} rmhCuY?f
DBUtils.closeConnection(conn); 6Nl$&jL
} #|CG %w
} cX=` Tl
public long getLast(){ sO
return lastExecuteTime; wR4P0[
} .xk<7^ZD
public void run(){ Y"lxh/l$}
long now = System.currentTimeMillis(); vc!S{4bN
if ((now - lastExecuteTime) > executeSep) { TY#1Z )%
//System.out.print("lastExecuteTime:"+lastExecuteTime); MkYem6
//System.out.print(" now:"+now+"\n"); siG?Sd_2
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); B{K'"uC
lastExecuteTime=now; JDhA{VN6
executeUpdate(); lZua"Ju
} M"FAUqz`
else{ sXydMk`J
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); JZv]tJWq
} .*f;v4!
} Sx ~_p3_5U
} =L=#PJAPj
//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
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wYxizNv,
类写好了,下面是在JSP中如下调用。 2$Ji4`p}S
[@y=%\%R
<% HcVPJuD
CountBean cb=new CountBean(); ft*0?2N~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); A,og9<+j-
CountCache.add(cb); ,mX|TI<*
out.print(CountCache.list.size()+"<br>"); eHJ7L8#
CountControl c=new CountControl(); N1Z8I:
c.run(); j(BS;J$i
out.print(CountCache.list.size()+"<br>"); 5]Ra?rF
%>