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: aE+E'iL
|"arVde
CountBean.java (Xx
@_
NW$Z}?I
/*
& Ef'5
* CountData.java \|kU{d0
* 0>vm&W<?)
* Created on 2007年1月1日, 下午4:44 ke0Vy(3t{h
* zK}.Bhj#
* To change this template, choose Tools | Options and locate the template under -7CkOZT
* the Source Creation and Management node. Right-click the template and choose -<.>jX
* Open. You can then make changes to the template in the Source Editor. x~
I cSt
*/ RSy1 wp4W
4&tY5m>
package com.tot.count; )<+Z,6
X@B+{IFC
/** =6>mlI>i
* *ood3M[M^
* @author vg<_U&N=-r
*/ 3oj30L.
public class CountBean { HG3jmI+u>
private String countType; >%{h_5
int countId; + IMP<
/** Creates a new instance of CountData */ ,ua]h8
public CountBean() {} :t(}h!7
public void setCountType(String countTypes){ C)`/Q( ^
this.countType=countTypes; rz4S"4
} NWFZ:h@v
public void setCountId(int countIds){
I3A](`
this.countId=countIds; >[[< 5$,T
} {Tx+m;5F
public String getCountType(){ 27)$;1MT:
return countType; l-5-Tf&j
} |(Sqd;#v
public int getCountId(){ 2e+DUZBoC
return countId; |
r2'B
} O*CKyW_$t
} qk+:p]2
`":< ]lj
CountCache.java 'kp:yI7w
v6]lH9c{,
/* V /|@
* CountCache.java gZ 9<H q
* CpA=DnZ
* Created on 2007年1月1日, 下午5:01 ~s+\Y/@A
* Hc}(+wQN%
* To change this template, choose Tools | Options and locate the template under #;+GNF}0mG
* the Source Creation and Management node. Right-click the template and choose Bdf3@sbM]
* Open. You can then make changes to the template in the Source Editor. NVP~`sxiZ
*/ 'M&`l%dIPf
?=aQG0
package com.tot.count; g=b'T-
import java.util.*; =>&d[G[m!
/** vAX %i( 4
* %ePInpb
* @author F&Q:1`y
*/ R6!t2gdKe@
public class CountCache { wqJH
public static LinkedList list=new LinkedList(); VsFRG;:\U
/** Creates a new instance of CountCache */ t~e.LxN
public CountCache() {} +YXyfTa
public static void add(CountBean cb){ *PD7H9m
if(cb!=null){ gmt`_Dpm$
list.add(cb); Tk)y*y
} pX"f "
} s %/3X\_
} 5E4np`J
IpHGit28
CountControl.java '(=krM9;
tMC<\e
/* 5s8k^n"A
* CountThread.java r-=#C1eY&
* ?bY'J6n.
* Created on 2007年1月1日, 下午4:57 zK?[6n89f
* $5(co)C
* To change this template, choose Tools | Options and locate the template under %-> X$,Q
:
* the Source Creation and Management node. Right-click the template and choose T=9+
* Open. You can then make changes to the template in the Source Editor. 6~j6M4*
*/ H&l/o
S9-FKjU
package com.tot.count; Lk4gjs,V
import tot.db.DBUtils; ~#Vrf0w/
import java.sql.*; Ea 0
j}
/** o#CNr5/
* =#^\9|?$
* @author RWK|?FD\<
*/ 9/`T]s"
public class CountControl{ W
A-\2
private static long lastExecuteTime=0;//上次更新时间 uK1DC i
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 .*i.Z
/** Creates a new instance of CountThread */ l.El3+
public CountControl() {} Sw%^&*J
public synchronized void executeUpdate(){ /GqW1tcO
Connection conn=null; +uLl3(ml
PreparedStatement ps=null; 5V]!xi
try{ sBt,y_LW
conn = DBUtils.getConnection(); -6@#Nq_iWU
conn.setAutoCommit(false); \'x.DVp
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); d=yuuS/
for(int i=0;i<CountCache.list.size();i++){ 22(7rUkI
CountBean cb=(CountBean)CountCache.list.getFirst(); =HH}E/9z
CountCache.list.removeFirst(); OjFB_
N
ps.setInt(1, cb.getCountId()); ch!/k
ps.executeUpdate();⑴ "`s{fy~mV
//ps.addBatch();⑵ f
}P6P>0T
} PVLLuv
//int [] counts = ps.executeBatch();⑶ 67?O}~jbG
conn.commit(); <>%2HRn<u
}catch(Exception e){ R0HzNk
e.printStackTrace(); )T&ZiHIJ3
} finally{ gd#+N]C_
try{ tFn_{fCc>
if(ps!=null) { 4zzJ5,S 1
ps.clearParameters(); lp+Uox
ps.close(); }fU"s"
ps=null; Lk#8G>U
} "V'<dn
}catch(SQLException e){} B
OKY
X
DBUtils.closeConnection(conn); EIug)S~
} sYE|
} :"{("!x
public long getLast(){ %OE
(?~dq
return lastExecuteTime; N3"O#C
} Vq4g#PcG
public void run(){ OiI29
long now = System.currentTimeMillis(); Ku$:.
if ((now - lastExecuteTime) > executeSep) { >{R+j4%
//System.out.print("lastExecuteTime:"+lastExecuteTime); *sz:c3{_
//System.out.print(" now:"+now+"\n"); |$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); V(wm?Cc]
lastExecuteTime=now; Z}$wvd
executeUpdate(); ~T">)Y~+xI
} (J}tCqP
else{ OXDEU.
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /3#)
} K-<<s
} #:[^T,YD0
} q|h#J}\
//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 t.X8c/,;g
+@G#Z3;l!
类写好了,下面是在JSP中如下调用。 (}*1,N!#
>W>3w
<% ~'lY Q[7
CountBean cb=new CountBean(); 8GlRO4yd
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); VRE[vM'
CountCache.add(cb); v-(dh5e`
H
out.print(CountCache.list.size()+"<br>"); PJ-g.0q
CountControl c=new CountControl(); uSQRI9/ir2
c.run(); @;;3B
out.print(CountCache.list.size()+"<br>"); Ndmki
7A
%>