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: 41WnKz9c
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CountBean.java *S_eYKSl
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/* rm NqS+t
* CountData.java !h{qO&ZH=
* 2`Xy}9N/Y
* Created on 2007年1月1日, 下午4:44 z)r)w?A
* HP2]b?C
* To change this template, choose Tools | Options and locate the template under #m6 eG&a
* the Source Creation and Management node. Right-click the template and choose #n7uw
* Open. You can then make changes to the template in the Source Editor. "EQ-`b=I4
*/ X 6/k `J
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package com.tot.count; iNgHx[*?
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/** *BT-@V.4
* =usx' #rb
* @author 2![.Kbqa%
*/ AW4N#gt8',
public class CountBean { 6e$(-ai
private String countType; wGE:U`
int countId; Aq}]{gfQ1
/** Creates a new instance of CountData */ C XZm/^
public CountBean() {} n0kBLn
public void setCountType(String countTypes){ NWSBqL5v
this.countType=countTypes; q3B#rje>h
} [ottUS@
public void setCountId(int countIds){ O2?ye 4uq
this.countId=countIds; ._"U{
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} eZ
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public String getCountType(){ ;OQ{
return countType; <SUjz}_Oa:
} l
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public int getCountId(){ 3HC aZ?Ry'
return countId; a5:Q%F<!
}
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} Zg%U4m:
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CountCache.java P}y}IR{6
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/* .xuLvNyQr
* CountCache.java M;={] w@n
* b2.
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* Created on 2007年1月1日, 下午5:01 {n=)<w
* Q2iS0#
* To change this template, choose Tools | Options and locate the template under aHe/MucK
* the Source Creation and Management node. Right-click the template and choose lqa.Nj
* Open. You can then make changes to the template in the Source Editor. a1B_w#?8
*/ 2GA6@-u\
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package com.tot.count; MOY.$M,1
import java.util.*; sXkWs2!
/** %p)6m2Sb
* 7\'vSHIL
* @author @;M( oFS9
*/ 3Ln~"HwP
public class CountCache { g= k}6"F~
public static LinkedList list=new LinkedList(); i2/:'
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/** Creates a new instance of CountCache */ Zh]d&Xeq
public CountCache() {} yv^j~
public static void add(CountBean cb){ `h/j3fmX?
if(cb!=null){ [S9T@Q
list.add(cb); qi_[@da f?
} {BKu'A
} f@T/^|`mh
} ZFNM>C^
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CountControl.java DTk)Y-eQ
*<#jr
/* 4:=']C
* CountThread.java h}i
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* >nkd U
* Created on 2007年1月1日, 下午4:57 MQY^#N
* R_:47.qq
* To change this template, choose Tools | Options and locate the template under a33}CVG-e3
* the Source Creation and Management node. Right-click the template and choose <Vm+Lt9
* Open. You can then make changes to the template in the Source Editor. 2?58=i%b
*/ tzJdUZJ
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package com.tot.count; /<vbv
import tot.db.DBUtils; 3 :X3n\z
import java.sql.*; T~7i:<E^
/** 7R[4XQ%
* PuqT&|wP l
* @author ehl){Dd^
*/ -$J\BkI
public class CountControl{ \%z#|oV#<
private static long lastExecuteTime=0;//上次更新时间 /Y:&307q
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 RrRrB"!8nR
/** Creates a new instance of CountThread */ mBSa*s)
public CountControl() {} W#E`h
public synchronized void executeUpdate(){ *P_(hG&c
Connection conn=null; u;p{&\(]
PreparedStatement ps=null; s3kHNDdC
try{ >
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conn = DBUtils.getConnection(); w d2GKq!
conn.setAutoCommit(false); 3r!6Z5P7{'
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /Pv
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for(int i=0;i<CountCache.list.size();i++){ n]?Yv E
CountBean cb=(CountBean)CountCache.list.getFirst(); AHc:6v^
CountCache.list.removeFirst(); eTemRNz
ps.setInt(1, cb.getCountId()); n~l9`4wJY
ps.executeUpdate();⑴ q%%8oaEI
//ps.addBatch();⑵ A(2_hl-
} 0]?} kY
//int [] counts = ps.executeBatch();⑶ #g*U\y
conn.commit(); 2W:R{dHE
}catch(Exception e){ 3
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e.printStackTrace(); Gf(hN|X.
} finally{ z %{Z
try{ e`zx#v
if(ps!=null) { b}< T<
ps.clearParameters(); x.CUJ^_.
ps.close(); |1wfLJ4--l
ps=null; (+q#kKR
} >=BH$4Ce
}catch(SQLException e){} ggtGecKm
DBUtils.closeConnection(conn); b<>GF-`w
} : kz*.1
} _^;+_6&[
public long getLast(){ GOuBNaU{
return lastExecuteTime; U>?q|(u
} m/RX~,T*v&
public void run(){ a~E@scD
long now = System.currentTimeMillis(); Qn'Do4Le
if ((now - lastExecuteTime) > executeSep) { )Kkw$aQI"d
//System.out.print("lastExecuteTime:"+lastExecuteTime); Z&9MtpC+N3
//System.out.print(" now:"+now+"\n"); G66sPw
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); "S)2<tV
lastExecuteTime=now; <qjNX-|
executeUpdate(); f#mBMdj
} /8(c^
else{ ~XGBE
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); $Wt0e 4YSu
} /(Mi2$@v1
} cO/%;HEV
} mW~t/$Y$
//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 5SPhdpIg@[
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类写好了,下面是在JSP中如下调用。 G<n(\85X
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<% 4j^-n_T
CountBean cb=new CountBean(); vFKX@wV S
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); DT *'r;
CountCache.add(cb); 4Gz5Ju
out.print(CountCache.list.size()+"<br>"); ?}|l )
CountControl c=new CountControl(); };;\&#
c.run(); qNb|6/DG
out.print(CountCache.list.size()+"<br>"); fd~a\5%e
%>