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: 6wqq"6w
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CountBean.java =V/$&96Q
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/* O<)"kj 7
* CountData.java Z>wg
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* <6Y o%xt
* Created on 2007年1月1日, 下午4:44 ppM d
* =zK7`5
* To change this template, choose Tools | Options and locate the template under Y9'Bdm/
* the Source Creation and Management node. Right-click the template and choose H9xxId?3u
* Open. You can then make changes to the template in the Source Editor. I,_wt+O&j
*/ ?Q]&d!UCs
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package com.tot.count; Q*^zphT
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/** >(<OhS(
* B&0-~o3WP
* @author =L
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*/ |GA4fFE=
public class CountBean { gX{V>T(<
private String countType; A%"mySW
int countId; S=0zP36kH:
/** Creates a new instance of CountData */ ;k9s@e#a
public CountBean() {} V=H87^b
public void setCountType(String countTypes){ sc@v\J;k
this.countType=countTypes; s~6?p%
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} :cnH@:
public void setCountId(int countIds){ <ij;^ygYD
this.countId=countIds; INyreoMp
} L@_IGH
public String getCountType(){ q-KN{y/
return countType; w5bD
} TlYeYN5V
public int getCountId(){ Y@c!\0e$
return countId; #W @6@Mv
} erdWGUfQOe
} _WVeb}
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CountCache.java NFDi2L>Ba
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/* A%Pjg1(uX
* CountCache.java &\F`M|c
* g|9'Lk
* Created on 2007年1月1日, 下午5:01 0vqXLFf
* pfe9n[
* To change this template, choose Tools | Options and locate the template under 1,p7Sl^h
* the Source Creation and Management node. Right-click the template and choose |>gya&
* Open. You can then make changes to the template in the Source Editor. ^+Ie
*/ xx)egy_
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package com.tot.count; /(bPc12
import java.util.*; pUZbZ
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/** ssoIC
* ]uI#4t~
* @author W~$YKBW
*/ ;_@u@$=~
public class CountCache { 9*h?g+\
public static LinkedList list=new LinkedList(); 0V
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/** Creates a new instance of CountCache */ @{+c6.*}
public CountCache() {} ULIbVy7Y
public static void add(CountBean cb){ frWw-<HoI
if(cb!=null){ c_s=>z
list.add(cb); r{pTMcDS
} C&^"]-t
} s(w6Ldi
} vj]-p=
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CountControl.java *[]7l]XK.
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/* 'JsP9>)
* CountThread.java :EJ+#
* >)YaWcI
* Created on 2007年1月1日, 下午4:57 *)gbKXb
* E?l_*[G
* To change this template, choose Tools | Options and locate the template under xL3-(K6e
* the Source Creation and Management node. Right-click the template and choose ycg5S rg
* Open. You can then make changes to the template in the Source Editor. 3fgVvt-2
*/ h2#G
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package com.tot.count; h.gj4/g
import tot.db.DBUtils; `PXSQf
import java.sql.*; f}PT3
/** %>_ZUu3M
* .S>:-j'u
* @author 1@JAY!yoo_
*/ aF7" 4^ P
public class CountControl{ IGeXj%e
private static long lastExecuteTime=0;//上次更新时间 f7c%Z:C#Y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 cY
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/** Creates a new instance of CountThread */ 494"-F 6
public CountControl() {} d[;S n:B
public synchronized void executeUpdate(){ w[~O@:`]<o
Connection conn=null; J+r\EN^9
PreparedStatement ps=null; 3qR%Mf'
try{ ;HtHN
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conn = DBUtils.getConnection(); jc)[5i0
conn.setAutoCommit(false); DF|(CQs9
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); -.~Dhk
for(int i=0;i<CountCache.list.size();i++){ x9)^0Hbo
CountBean cb=(CountBean)CountCache.list.getFirst(); Lt$LXE
CountCache.list.removeFirst(); P!q!+g
ps.setInt(1, cb.getCountId()); |j($2.
ps.executeUpdate();⑴ }SIUsh'
//ps.addBatch();⑵ ~1jSz-s
} @iWql*K;m
//int [] counts = ps.executeBatch();⑶ 8Ux3,X=
conn.commit(); 'B ocMjRA
}catch(Exception e){ *Hx{ eqC
e.printStackTrace(); RoCX*3 d
} finally{ p0U4#dD6
try{ 1|_jV7`Mz
if(ps!=null) { jHBzZ!<
ps.clearParameters(); r8x<-u4
ps.close(); x?v/|
ps=null; Z+!._uA
} 6}zargu(;
}catch(SQLException e){} wiKUs0|
DBUtils.closeConnection(conn); K;Qlg{v
} {XAm3's
} oh
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public long getLast(){ 4n_f7'GZg
return lastExecuteTime; mcvd/
} 7~n<%q/6
public void run(){ VX0q!Q
long now = System.currentTimeMillis(); ^EY^.?Mg
if ((now - lastExecuteTime) > executeSep) { p2s*'dab7
//System.out.print("lastExecuteTime:"+lastExecuteTime); N]f"+
//System.out.print(" now:"+now+"\n"); N=R|s$,Oy9
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); fgcI55&jV{
lastExecuteTime=now; <pJeiMo
executeUpdate(); %2>ya>/M
} jI:5[. Y
else{ @k~'b
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); uf4C+ci
} 32j@6!
} I*8i=O@0T
} 3~v'Ev
//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 Sxo9y0K8-
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类写好了,下面是在JSP中如下调用。 =g)|g+[H
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<% #Duz|F+%
CountBean cb=new CountBean(); hZ6CiEJB
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); #;,dk(URo
CountCache.add(cb); :=9?XzCC
out.print(CountCache.list.size()+"<br>"); ^UTQcm
CountControl c=new CountControl(); 7` AQn],
c.run(); }Fy~DsQ
out.print(CountCache.list.size()+"<br>"); |]FJfMX
%>