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: Mx7
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CountBean.java D<16m<b
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/* K4G43P5q`
* CountData.java kE8\\}B7
* isG8S(}IW&
* Created on 2007年1月1日, 下午4:44 Q1b<=,
* .+@;gVZx1
* To change this template, choose Tools | Options and locate the template under XtJIaD|:3
* the Source Creation and Management node. Right-click the template and choose FyF./
* Open. You can then make changes to the template in the Source Editor. yobcAV`
*/ Ug VLHwkvk
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package com.tot.count; Y-&SZI4H
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/** -E$(<Pow~\
* ty W5k(>
* @author R2e":`0I
*/ *NC9S,eSP
public class CountBean { /.1yxb#Z?,
private String countType; >!D^F]CH
int countId; SJ4+s4!l
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/** Creates a new instance of CountData */ ep$C
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public CountBean() {} <T3 v|\6~H
public void setCountType(String countTypes){ JNJ96wnX1
this.countType=countTypes; N<$dbqoT|
} V,*<E &+
public void setCountId(int countIds){ RZ6[+Ygn
this.countId=countIds; I:L}7uA[t
} '[Ue0r<jn
public String getCountType(){ mB.j?@Y%
return countType; MXsCm(
} mBrH`!
public int getCountId(){ MR?5p8S#g
return countId; 5Al1u|;HB
} e}PJN6"5
} SqF `xw
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CountCache.java |#Gug('
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/* pGsk[.
* CountCache.java k6}M7&nY
* Fad.!%[
* Created on 2007年1月1日, 下午5:01 mRNA ,*
* mr6 ~8I
* To change this template, choose Tools | Options and locate the template under EZY <k#
* the Source Creation and Management node. Right-click the template and choose P,eP>55'K
* Open. You can then make changes to the template in the Source Editor. FJ/c(K
*/ -PG81F&K
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package com.tot.count; &tJ!cTA.-
import java.util.*; \U?$ r[P
/** P4VMGP
* )Z"
* @author zUIh^hbFf
*/ [Zpx
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public class CountCache { ~0 PR>QJ
public static LinkedList list=new LinkedList(); 4ZX6=-u^
/** Creates a new instance of CountCache */ (v)/h>vS
public CountCache() {} DD?zbN0X
public static void add(CountBean cb){ -r'/PbV0
if(cb!=null){ m-v0=+~&
list.add(cb); v|7=IJ
} XaxM$
} 4pJ #fkc^
} +NT8dd
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CountControl.java _1hiNh$
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/* j1141md5
* CountThread.java :f/T$fa*
* |c)hyw?[Y
* Created on 2007年1月1日, 下午4:57 :,@\q0j"=
* TOx >Z
* To change this template, choose Tools | Options and locate the template under }<9IH%sgF
* the Source Creation and Management node. Right-click the template and choose ] oMtqkiR
* Open. You can then make changes to the template in the Source Editor. XH`W(
*/ n$u@v(I
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package com.tot.count; qj#C8Tc7
import tot.db.DBUtils; z*w.A=r
import java.sql.*; _X6@.sM/2
/** TSEv^u)3
* >* )fmfY
* @author fN!lXPgM
*/ ZYexW=@
public class CountControl{ GL^84[f-T
private static long lastExecuteTime=0;//上次更新时间 ~x-v%x6
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I"hlLP
/** Creates a new instance of CountThread */ yW)&jZb"(
public CountControl() {} 99YgQ Y]HO
public synchronized void executeUpdate(){ {2v,J]v_[
Connection conn=null; Ds<~JfVl
PreparedStatement ps=null; +I>V9%%vW_
try{ $[xS>iuD
conn = DBUtils.getConnection(); r1A<XP|1?I
conn.setAutoCommit(false); Pl\r|gS;
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); QUO'{;,
for(int i=0;i<CountCache.list.size();i++){ Yf?hl
CountBean cb=(CountBean)CountCache.list.getFirst(); 51Q m2,P1^
CountCache.list.removeFirst(); Q|7$SS6$
ps.setInt(1, cb.getCountId()); ?lPyapA]
ps.executeUpdate();⑴ 8JFvz(SK>
//ps.addBatch();⑵ TCL XO0
} Pea2ENe3
//int [] counts = ps.executeBatch();⑶ @km@\w
conn.commit(); Klj -dz
}catch(Exception e){ uf/4vz,
e.printStackTrace(); Rh :|ij>B
} finally{ "2=v:\~=
try{ #7r13$>!
if(ps!=null) { ]5',`~jkF
ps.clearParameters(); 8fSY@
ps.close(); =MjkD)l
ps=null; v 1VH&~e
} }Sr=|j
}catch(SQLException e){} ak"W/"2:
DBUtils.closeConnection(conn); U0ZPY )7k
} sJ{J@/5
} F.cKg~E|e
public long getLast(){ @QO^3%b8
return lastExecuteTime; hQ@E2 Xsv
} .gclE~h.
public void run(){ gski:C
long now = System.currentTimeMillis(); M 3&GO5<
if ((now - lastExecuteTime) > executeSep) { L6 IIk
//System.out.print("lastExecuteTime:"+lastExecuteTime); =fcM2O#$
//System.out.print(" now:"+now+"\n"); v
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Xx+eGV";`
lastExecuteTime=now; '',g}WvRwe
executeUpdate(); {X EX0|TZ
} wM1&_%N
else{ \&MJ(F>vJ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {%+UQ!]d8
} 3%(,f,
} ]R*h3U@5#K
} Y.b?.)u&
//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 jY k5]2#A
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类写好了,下面是在JSP中如下调用。 {l9g YA
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<% GCj[ySCD
CountBean cb=new CountBean(); Gq]/6igzX
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); yXT.]%)
CountCache.add(cb); +.-g`Vyz*
out.print(CountCache.list.size()+"<br>"); cb5T-'hY
CountControl c=new CountControl(); y!VL`xV
c.run(); PS3jCT
out.print(CountCache.list.size()+"<br>"); 2 -pv
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%>