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: Q2[prrk%j
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CountBean.java Mg a@JA"
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/* {XDY:`vZ}
* CountData.java c4ZuW_&:
* T<TcV9vM
* Created on 2007年1月1日, 下午4:44 _X,[]+ziu%
* 8z."X$
* To change this template, choose Tools | Options and locate the template under jIx8k8
* the Source Creation and Management node. Right-click the template and choose +&7[lsD*
* Open. You can then make changes to the template in the Source Editor. RVgPH<1X@e
*/ _4.]A3;}
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package com.tot.count; "'z,[v50&
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/** XSm"I[.g
* {uaZ<4N.
* @author 4GU/V\e|
*/ eq@am(#&kY
public class CountBean { W.#}qK"
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private String countType; ()QOZ+x_!
int countId; FGDGWcRw~
/** Creates a new instance of CountData */ (B_7\}v|_
public CountBean() {} "EcX_>
public void setCountType(String countTypes){ |+Hp+9J
this.countType=countTypes; ~Ho{p Oq
} %Ycx C0S[
public void setCountId(int countIds){ kf%&d}2to
this.countId=countIds; "*++55
} .N~PHyXZR
public String getCountType(){ w24{_ N
return countType; X(Y#9N"
} P"(z jG9-
public int getCountId(){ 3I9T|wQ-]
return countId; PGPISrf
} oUJj5iu}
} }}^,7npU
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CountCache.java
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/* \H Wcd|
* CountCache.java GXDC@+$14
* sU) TXL'_!
* Created on 2007年1月1日, 下午5:01 ?S (im
* h>}ax\h
* To change this template, choose Tools | Options and locate the template under ,?l~rc
* the Source Creation and Management node. Right-click the template and choose _j:UGMTi(U
* Open. You can then make changes to the template in the Source Editor. ;{<aA 5
*/ \~JNQ&_o
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package com.tot.count; 9R9__w;
import java.util.*; Y3#Nux%
/** L'zE<3O'3
* uije#cj#O
* @author y[:
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*/ a}:A, t<6
public class CountCache { v8ba~
public static LinkedList list=new LinkedList(); D
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/** Creates a new instance of CountCache */ 96(R'^kNX
public CountCache() {} QBy{|sQ`
public static void add(CountBean cb){ Tbv/wJ
if(cb!=null){ ShQ|{P9
list.add(cb); |u@+`4o
} OFc\fW#
} ojHhT\M`
} !Y (apVQ
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CountControl.java `/#f?Hk=
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/* 10p8|9rE}B
* CountThread.java yn SBVb!)
* `
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* Created on 2007年1月1日, 下午4:57 rwiw
Rh
* %BUEX
* To change this template, choose Tools | Options and locate the template under _ Yfmxn8V
* the Source Creation and Management node. Right-click the template and choose QE|`&~sme
* Open. You can then make changes to the template in the Source Editor. H&M1>JtE
*/ lC0~c=?J
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package com.tot.count; O~V1Ywfq7^
import tot.db.DBUtils; A (Bk@;
import java.sql.*; u*2fP]n
/** #~L!pKM
* ;HDZ+B
* @author "'m)VG
*/ 2
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public class CountControl{ j&5G\6:
private static long lastExecuteTime=0;//上次更新时间 >c<pDNt?
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +R!zs
/** Creates a new instance of CountThread */ ~g6"'Cya?k
public CountControl() {} 7paUpQit
public synchronized void executeUpdate(){ EIr@g
Connection conn=null; NmJ`?-Z
PreparedStatement ps=null; OTj,O77k
try{ ._?V%/
conn = DBUtils.getConnection(); ?v:ZU~i
conn.setAutoCommit(false); l3.
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); we3tx{j
for(int i=0;i<CountCache.list.size();i++){ hq=,Z1J
CountBean cb=(CountBean)CountCache.list.getFirst(); # ly@;!M
CountCache.list.removeFirst(); K UKACUL
ps.setInt(1, cb.getCountId()); N2BI_,hI1
ps.executeUpdate();⑴ ^T:gb]i'Qa
//ps.addBatch();⑵ wd[eJcQ ,
} q/NY72tj0
//int [] counts = ps.executeBatch();⑶ jNA1O68N
conn.commit(); Rf)ke("
}catch(Exception e){ /@hJpz|+
e.printStackTrace(); v?%LQKO
} finally{ 44\cI]!{
try{ MoD?2J
if(ps!=null) { pj0fM{E
ps.clearParameters(); 03k?:D+5
ps.close(); w7FoL
ps=null; |Y},V_@d
} )0k']g5
}catch(SQLException e){} y7:tr
DBUtils.closeConnection(conn); j?6X1cM q
} glE^t6)
} + H_MV=A^
public long getLast(){ \}5p0.=
return lastExecuteTime; 1D F/6y
} {^}0 G^
public void run(){ <@G8ni
long now = System.currentTimeMillis(); fuUm}N7
if ((now - lastExecuteTime) > executeSep) { 5|I55CTx
//System.out.print("lastExecuteTime:"+lastExecuteTime); maNW{"1
//System.out.print(" now:"+now+"\n"); -)jax
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); /6KIl
lastExecuteTime=now; x[Im%k
executeUpdate(); }tG3tz0%fX
} ^B/9{0n'
else{ ;
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 2;$k(x]
} a.@qGsIH
} F%d\~Vj
} w%y\dIeI'
//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|YWOy@D~
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类写好了,下面是在JSP中如下调用。 I.'b'-^
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<% yX!HZu;j
CountBean cb=new CountBean(); _oFs #kW
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (`BSVxJH
CountCache.add(cb); T ?Fcohz(
out.print(CountCache.list.size()+"<br>"); $ ((6=39s
CountControl c=new CountControl(); tK(g-u0N`(
c.run(); (X[CsaXt
out.print(CountCache.list.size()+"<br>"); Hr<o!e{Y
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