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: |-.r9;-b
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CountBean.java g;t>jgX
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/* Yp8GW1@
* CountData.java -+Ab[
* Zh3hCxXa
* Created on 2007年1月1日, 下午4:44 ahx*Ti/e
* GHR,KB7 xM
* To change this template, choose Tools | Options and locate the template under D?}K|z LQ
* the Source Creation and Management node. Right-click the template and choose ~t.M!vk
* Open. You can then make changes to the template in the Source Editor. 7&{[Y^R]"
*/ D+69U[P_A
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package com.tot.count; &/tGT3)
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/** }
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* Z{spo=
* @author [{cMEV&
*/ =#sr4T
public class CountBean { Uh8c!CA8:\
private String countType; I,wgu:}P#
int countId; <-K'9ut,
/** Creates a new instance of CountData */ DW.vu%j^[
public CountBean() {} N!W2O>VS
public void setCountType(String countTypes){ 6A*k
this.countType=countTypes; = ,^eQZR:
} T{Y;-m
public void setCountId(int countIds){ 3( `NHS~h
this.countId=countIds; O'~;|-Z<
} ]Z#=w
public String getCountType(){ MNZD-[
return countType; )H`1CcT
} 6[l{@*r"
public int getCountId(){ D+xHTQNTL
return countId; `dK%I
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} R3ru<u>k&
} sqP (1|9
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CountCache.java i\z ,)xp
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/* ]Y@B= 5e/
* CountCache.java v35=4>Y
* Ht!]%
* Created on 2007年1月1日, 下午5:01 O6Jn$'os1#
* 95^A !
* To change this template, choose Tools | Options and locate the template under [
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* the Source Creation and Management node. Right-click the template and choose t/L:Y=7w
* Open. You can then make changes to the template in the Source Editor. wJKP=$6n_
*/ `UDB9Ca
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package com.tot.count; <u%&@G$F>
import java.util.*; 5
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/** _"R /k`8
* o2#_CdU
* @author ^-GzWT
*/ M5>cYVG
public class CountCache { t?<pyw $
public static LinkedList list=new LinkedList(); tj=l!
/** Creates a new instance of CountCache */ wYIlp
public CountCache() {} }*s%|!{H
public static void add(CountBean cb){ MeXGE
if(cb!=null){ ,ThN/GkSC
list.add(cb); ;u
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} G>yTv`-
} :Lze8oY(D}
} 0281"aO
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CountControl.java "[t (u/e
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/* E+xC1U
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* CountThread.java HbXYinG%
* smTPca)7s
* Created on 2007年1月1日, 下午4:57 QKt[Kte
* EvQMt0[?EW
* To change this template, choose Tools | Options and locate the template under Nn]|#lLP
* the Source Creation and Management node. Right-click the template and choose <W<>=vDzyE
* Open. You can then make changes to the template in the Source Editor. 9C2DW,?
*/ N);2 2-
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package com.tot.count; [c_o.`S_\
import tot.db.DBUtils; d"Aer
import java.sql.*; 27q=~R}
/** "Gh5
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* aS,M=uqqK
* @author uiQR RT
*/ 8Z:T.Gc
public class CountControl{ qe{:9
private static long lastExecuteTime=0;//上次更新时间 |}Wm,J
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 B(TE?[ #
/** Creates a new instance of CountThread */ #2qDn^s
public CountControl() {} oYn|>`+6:y
public synchronized void executeUpdate(){ Kk?C
Connection conn=null; ;('(Yn7~
PreparedStatement ps=null; 0V_dg |.
try{ 6mAaFDI,R
conn = DBUtils.getConnection(); +P5\N,,7R
conn.setAutoCommit(false); %SHgXd#X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); v62M8r,Y
for(int i=0;i<CountCache.list.size();i++){ dNg5#?mzT5
CountBean cb=(CountBean)CountCache.list.getFirst(); ap y#8]
CountCache.list.removeFirst(); XD=p:Ezh
ps.setInt(1, cb.getCountId()); Ns}BE H
ps.executeUpdate();⑴ 4gkaCk{]
//ps.addBatch();⑵ U.,_zEbx,
} 6<
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//int [] counts = ps.executeBatch();⑶ y/(60H,{{
conn.commit(); d=v{3*a_4,
}catch(Exception e){ / 80Q
e.printStackTrace(); 2Sg^SZFH+o
} finally{ ,/uVq G
try{ 0
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if(ps!=null) { > q!:*
ps.clearParameters(); ZP}NFh%,u
ps.close(); "f5 neW
ps=null; f0d*%
} Y"dUxv1Ap
}catch(SQLException e){} X}@'FxIF
DBUtils.closeConnection(conn); 4u.Fy<+@4M
} c> }fy
} (0W)Jd[
public long getLast(){ 9yrSCDu00
return lastExecuteTime; e"@Ag:r@a
} Un.u{$po
public void run(){ lcqpwSk
long now = System.currentTimeMillis(); _q7mYc
if ((now - lastExecuteTime) > executeSep) { dbG5Cf#K\
//System.out.print("lastExecuteTime:"+lastExecuteTime); fDU_eyt/Z'
//System.out.print(" now:"+now+"\n"); A`nw(f_/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); lCAD $Ia~
lastExecuteTime=now; ~p* \|YC
executeUpdate(); s=BJ7iU_68
} Y:-O/X
else{ ^0fe:ac;
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Y$\c_#/]
} RP1sQ6$
} [42EqVR
} $YztLcn
//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 r-aCa/4y!
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类写好了,下面是在JSP中如下调用。 xb22:
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<% OoqA`%
CountBean cb=new CountBean(); u>y/<9]q8
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 1> IA9]D7
CountCache.add(cb); z3mo2e
out.print(CountCache.list.size()+"<br>"); S+*g
CountControl c=new CountControl(); ZKp9k6
c.run(); T5gL
out.print(CountCache.list.size()+"<br>"); EjDr
%>