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: c=
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CountBean.java %rF?dvb;?
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/* k~/>b~.c
* CountData.java RiTa \
* }->.k/vc
* Created on 2007年1月1日, 下午4:44 A)~X,
* E%'~'[Q
* To change this template, choose Tools | Options and locate the template under K3' niGT
* the Source Creation and Management node. Right-click the template and choose p?2Y }9
* Open. You can then make changes to the template in the Source Editor. d~?X/sJ t
*/ F! X}(N?t
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package com.tot.count; fsEzpUY:{W
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/** HoLv`JA
* Sje wuIi1
* @author 3 AHY|
*/ |hO~X~P
public class CountBean { c(/VYMJZ&
private String countType; u1~9{"P*
int countId; %\kOLE2`
/** Creates a new instance of CountData */ q\q=PB6r
public CountBean() {} ErT{(t7
public void setCountType(String countTypes){ 7-~Q5Kr.
this.countType=countTypes; 7]BW[~77
} `- \/$M9s=
public void setCountId(int countIds){ Hi
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this.countId=countIds; Lj"A4i_
} ;=9
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public String getCountType(){ R.s^o]vT
return countType; eVR5Xar
} xEltwuDd?
public int getCountId(){ A+&xMM2Wj
return countId; 2TES>}
} {66fG53x
}
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CountCache.java ZZj~GQL(S
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/* Y9=(zOqv
* CountCache.java M@(^AK{mU
* K YkS9_yF
* Created on 2007年1月1日, 下午5:01 o%4Gd~
* 5I,gBT|B
* To change this template, choose Tools | Options and locate the template under z*a8sr
* the Source Creation and Management node. Right-click the template and choose $v`afd y
* Open. You can then make changes to the template in the Source Editor. O Lc}_
*/ ';G1A
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package com.tot.count; S/`%Q2za4
import java.util.*; $x#FgD(iI
/** D&ve15wL
* /oL;YIoQX
* @author /R
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*/ NJ MJ
public class CountCache { e8EfQ1 Ar
public static LinkedList list=new LinkedList(); gUAxyV
/** Creates a new instance of CountCache */ `$604+G
public CountCache() {} 8*SP~q
public static void add(CountBean cb){ 3^StIw{X
if(cb!=null){ : 5U"XY x@
list.add(cb); ;D.h65rr
} +"ueq
} cM&2SRBZ
} M('d-Q{B7L
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CountControl.java H2r8,|XL
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/* DOQc"+
* CountThread.java !>(RK"KWq]
* #u5~0,F
* Created on 2007年1月1日, 下午4:57 a1.|X i'/z
* 8CC/ BOe
* To change this template, choose Tools | Options and locate the template under ,SScf98,j
* the Source Creation and Management node. Right-click the template and choose u=&Bmn_
* Open. You can then make changes to the template in the Source Editor. -z:&*=
*/ RkuuogZ
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package com.tot.count; vU*x2fVb}
import tot.db.DBUtils; {S<>&?XB
import java.sql.*; 8yWoPm<A
/** %>WbmpIyc
* Vh<A2u3&
* @author 1P]de'-`j
*/ J.RAmU <
public class CountControl{ nd{R
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private static long lastExecuteTime=0;//上次更新时间 ;$BdP7i:
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 X jE>k!=I
/** Creates a new instance of CountThread */ %gcc
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public CountControl() {} S*"u/b;
public synchronized void executeUpdate(){ L fl-!1
Connection conn=null; ?`zgq>R}w[
PreparedStatement ps=null; 1j\aH&)GH
try{ _ jAo:K_Z
conn = DBUtils.getConnection(); *]x*B@RF
conn.setAutoCommit(false); E4D (,s
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); nN3$\gHp8i
for(int i=0;i<CountCache.list.size();i++){ [ut#:1h^
CountBean cb=(CountBean)CountCache.list.getFirst(); Ze!92g
CountCache.list.removeFirst(); ~ ~8rI[/
ps.setInt(1, cb.getCountId()); ,}C8;/V
ps.executeUpdate();⑴ ^ie^VY($
//ps.addBatch();⑵ A%vsno!
} *OdX u&5
//int [] counts = ps.executeBatch();⑶ g6sjc,`
conn.commit(); s(&;q4|
}catch(Exception e){ S*)o)34U
e.printStackTrace(); l#@&~f[
} finally{ p8, 0lo
try{ cX
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if(ps!=null) { 1Qh`6Ya f
ps.clearParameters(); Z0fJ9HW
ps.close(); 2 [!Mx&^
ps=null; P` '$
} OK`Z@X_,bW
}catch(SQLException e){} D22Lu;E
DBUtils.closeConnection(conn); q2_`v5t
} _a+ICqR
} ex?\c"
public long getLast(){ RP(/x+V
return lastExecuteTime; TRKgBK$,
} %HSl)zEo>C
public void run(){ T+RZ
long now = System.currentTimeMillis(); 3SARr>HRyI
if ((now - lastExecuteTime) > executeSep) { T 4|jz<iK]
//System.out.print("lastExecuteTime:"+lastExecuteTime); agd)ag4"[u
//System.out.print(" now:"+now+"\n"); Y5-kj,CB
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); sIm#_+Y
lastExecuteTime=now; I}v]Zm9
executeUpdate(); bj"z8 kP
}
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else{ .yVnw^gu
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (G4'(6
} $Kq<W{H3ut
} B;-2$
77
} [U_[</L7
//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 0k?Sq#7q
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类写好了,下面是在JSP中如下调用。 XKq@]=\F
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<% v_sm
CountBean cb=new CountBean(); ,w&:_n
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); K!b8= K`
CountCache.add(cb); 4^Ow^7N?
out.print(CountCache.list.size()+"<br>"); GM}C]MVD
CountControl c=new CountControl(); <4zT;:NQ
c.run();
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out.print(CountCache.list.size()+"<br>"); j;2<-{
%>