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: t2.juoI(
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CountBean.java k?-S`o%Q
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/* _85E=
* CountData.java viV-e$s`.
* P^4'|#~2T
* Created on 2007年1月1日, 下午4:44 =|JKu'
* gA+YtU{z
* To change this template, choose Tools | Options and locate the template under hht+bpHl
* the Source Creation and Management node. Right-click the template and choose X[{\3Av
* Open. You can then make changes to the template in the Source Editor. h/=-tr
*/ Xz* tbW#
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package com.tot.count; =,E'~P
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/** me$$he
* K~JC\a\0
* @author OR~G Ov|
*/ (WMLNv
public class CountBean { g&
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private String countType; 7b,AQ9
int countId; i n?T]}
/** Creates a new instance of CountData */ y`+<X{V5L
public CountBean() {} n|Ma&qs
public void setCountType(String countTypes){ gTD%4V
this.countType=countTypes; STRyW Ml
} >I:9'"`
public void setCountId(int countIds){ Esa6hU#
this.countId=countIds; [Ekgft&
} 5j1 IH,yW
public String getCountType(){ d!!3"{'
return countType; +1f{_v
} f>4+,@G
public int getCountId(){ ds')PIj
return countId; b)y<.pS\
} {4)5]62>u
} :z124Zf
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CountCache.java i*b4uHna
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/* MHn&;
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* CountCache.java bY&YSlO
* `7$Oh{67
* Created on 2007年1月1日, 下午5:01
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* I')x]edU
* To change this template, choose Tools | Options and locate the template under ^CX,nj_(
* the Source Creation and Management node. Right-click the template and choose /Sh4pu"'
* Open. You can then make changes to the template in the Source Editor. *fOIq88
*/ DW4MA<UQ
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package com.tot.count; 5I_hh?N4Z
import java.util.*; "pl[(rc+u
/** %rX\
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* =mAGD*NKu
* @author ]X4RnV55Q
*/ ":z@c,
public class CountCache { Xe> ~H4I9
public static LinkedList list=new LinkedList(); a1_o.A
/** Creates a new instance of CountCache */ AF
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public CountCache() {} Q!M sy<v
public static void add(CountBean cb){ >sB=\
if(cb!=null){ W *|OOa'
list.add(cb); Je@p5(f
} s}<)BRZi
} B##C{^5A`
} P'gT6*an,"
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CountControl.java =
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/* WMRYT"J?N]
* CountThread.java <w%Yq?^
* FC~|&
* Created on 2007年1月1日, 下午4:57 ]Oig..LJ
* EPR(i#xU
* To change this template, choose Tools | Options and locate the template under )moo?Q
* the Source Creation and Management node. Right-click the template and choose m]
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* Open. You can then make changes to the template in the Source Editor. l6yB_M
*/ /{49I,
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package com.tot.count;
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import tot.db.DBUtils; (4E.Li<O
import java.sql.*; s}z(|IrH
/** XtnIK
* tOu90gu
* @author 4Q&Xb <
*/ ^Osd/g
public class CountControl{ -zkW\O[
private static long lastExecuteTime=0;//上次更新时间 pqRO[XEp2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Z^jGT+ 2
/** Creates a new instance of CountThread */ 5EVB27k
public CountControl() {} pIM*c6
public synchronized void executeUpdate(){ k4]R]=Fh.
Connection conn=null; S]Yu6FtWiO
PreparedStatement ps=null; ])3lH%4-
try{ a @yE:HU
conn = DBUtils.getConnection(); UEx(~>
conn.setAutoCommit(false); Oi+Qy[y2
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 'd~, o[x
for(int i=0;i<CountCache.list.size();i++){ x`/m>~_
CountBean cb=(CountBean)CountCache.list.getFirst(); bw<~R2[
CountCache.list.removeFirst(); QySca(1tN
ps.setInt(1, cb.getCountId()); Q{(,/}kA-
ps.executeUpdate();⑴ s/k
//ps.addBatch();⑵ ;[;S_|vZ=)
} &km d<
//int [] counts = ps.executeBatch();⑶ 1+.y,}F6b
conn.commit(); ^ mQ;CMV
}catch(Exception e){ r!-L`GUm
e.printStackTrace();
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} finally{ 6+{ nw}e8
try{ C {H'
if(ps!=null) { f%(e,KgW=
ps.clearParameters(); @et3}-c
ps.close(); 10QNV=yK7s
ps=null; &
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} #Fb0;H9`
}catch(SQLException e){} bb0{-T)1
DBUtils.closeConnection(conn); $6]x,Ct
} yA`]%U((
} =Un 6|]
public long getLast(){ t9=|* =;9)
return lastExecuteTime; P(W\aLp
} b;t}7.V'%
public void run(){ @)!1#^(}%
long now = System.currentTimeMillis(); uDMUy"8&!
if ((now - lastExecuteTime) > executeSep) { y:(C=*^<t
//System.out.print("lastExecuteTime:"+lastExecuteTime); B@~eBU,$
//System.out.print(" now:"+now+"\n"); S+bWD7
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); El8.D3
lastExecuteTime=now; dwsy(g7
executeUpdate(); nk?xNe4
} C[/Uy
else{ D%";!7u
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (B?xq1Q
} WZy6K(18"'
} DIcyXZH<
} 2L{:H
//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 XP
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类写好了,下面是在JSP中如下调用。 ?28G6T]/?d
2%No>w}/2
<% ~d<`L[
CountBean cb=new CountBean(); )]e d;V
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); oXZ@*
CountCache.add(cb); V
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out.print(CountCache.list.size()+"<br>"); 2K7:gd8Ru
CountControl c=new CountControl(); C&#KdvN/r
c.run(); uEi.nSp)S
out.print(CountCache.list.size()+"<br>"); &>^Ympr
%>