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: okfhd{9
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CountBean.java 0]5QX/I
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/* r_Xk:
* CountData.java %"{SGp
* HhIa=,VY
* Created on 2007年1月1日, 下午4:44 ]V}";cm;2
* T}U`?s`)
* To change this template, choose Tools | Options and locate the template under UF0PWpuO
* the Source Creation and Management node. Right-click the template and choose 6&h,eQ!
* Open. You can then make changes to the template in the Source Editor. W${0#qq
*/ KZ&8aulP
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package com.tot.count; 6J-tcL*4"%
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/** 3M/kfy
* \vpUl
* @author $1/yc#w
u
*/ 5Vf#(r f
public class CountBean { {QJJw}!#
private String countType; 'BtvT[KM
int countId; `Y8F}%i[
/** Creates a new instance of CountData */ [N.4i"
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public CountBean() {} UG 9uNgzQ/
public void setCountType(String countTypes){ U H
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this.countType=countTypes; w8$8P
} X`#vH8
public void setCountId(int countIds){ {0QNqjue
this.countId=countIds; ioz4kG!
} j%Usui<DL
public String getCountType(){ J?LetyDNr]
return countType; t#=W'HyW8
} &r doMc;
public int getCountId(){ /*i[MB
return countId; 6 -N 442
} 0EKi?vP@y7
} J>TNyVaoQ
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CountCache.java mA@FJK_
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/* Z8%?ej`8
* CountCache.java B/0Xqyu
* ,` 6O{Z~
* Created on 2007年1月1日, 下午5:01 m%]1~b}"
* <Z5-?wgf9
* To change this template, choose Tools | Options and locate the template under UQc!"D
* the Source Creation and Management node. Right-click the template and choose %68'+qz
* Open. You can then make changes to the template in the Source Editor. jmPnUn
*/ 2RG6m=Y8y
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package com.tot.count; vJ9I z
import java.util.*; dhv?36uE
/** ~@ =(#tO.
* q=(%
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* @author G!dx)v
*/ cD6S;PSg
public class CountCache { Pm&h v*D
public static LinkedList list=new LinkedList(); =gNPS0H
/** Creates a new instance of CountCache */ %|j`z?i|
public CountCache() {} s|IY
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public static void add(CountBean cb){ ;`Nh@*_
if(cb!=null){ `>)[UG!:|
list.add(cb); cX7 O*5C
} MH=7(15R
} (qglD
} dq,j?~ _}
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CountControl.java &^2SdF
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/* v5>A1\
* CountThread.java L4,b ThSG
* J2<kOXXJ9
* Created on 2007年1月1日, 下午4:57 vd?Bk_d9k,
* @}=(4%
* To change this template, choose Tools | Options and locate the template under B (Ps/
* the Source Creation and Management node. Right-click the template and choose m _cRK}>
* Open. You can then make changes to the template in the Source Editor. U0gZf5;*
*/ $=iw<B r
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package com.tot.count; fIl;qGz85
import tot.db.DBUtils; 84vd~Cf9
import java.sql.*; |lt]9>|
/** W1 k]P.
* c/Xg ARCO
* @author dgL>7X=7
*/ LH)XD[
public class CountControl{ *,mI=1
private static long lastExecuteTime=0;//上次更新时间 f(Y_<%
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 !$A/.;0$
/** Creates a new instance of CountThread */ 2]1u0-M5L
public CountControl() {} y~fKLIoz"
public synchronized void executeUpdate(){ Dn6U8s&
Connection conn=null; "$XX4w
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PreparedStatement ps=null; lDTHK2f
try{ T]\c2U
conn = DBUtils.getConnection(); 3w</B-|nQ
conn.setAutoCommit(false); wqhktgG
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); oQ 2$z8
for(int i=0;i<CountCache.list.size();i++){ odCt6Du
CountBean cb=(CountBean)CountCache.list.getFirst(); nq)F$@
CountCache.list.removeFirst(); T9C_=0(hn
ps.setInt(1, cb.getCountId()); $P=C7;
ps.executeUpdate();⑴ &)Xc'RQ.C
//ps.addBatch();⑵ 7~ PL8
} HR}O:2'
//int [] counts = ps.executeBatch();⑶ B1V{3
conn.commit(); >>
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}catch(Exception e){ ]1|P|Jp
e.printStackTrace(); 8.i4QaU
} finally{ !R=@Nr>
try{ ;f=m+QXU
if(ps!=null) { Snx!^4+MF
ps.clearParameters(); );$99t
ps.close(); WwDM^}e
ps=null; wT4@X[5$
} "2l`XH
}catch(SQLException e){} qI+2,6
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DBUtils.closeConnection(conn); Y()"2CCV
} 0f^{Rp6
} xG9Sk
public long getLast(){ `POzwYh
return lastExecuteTime; /ad9Q~nJ
} *yu}e)(0
public void run(){ 5% 2A[B
long now = System.currentTimeMillis(); v1.3gzR
if ((now - lastExecuteTime) > executeSep) { ieFl4hh[G
//System.out.print("lastExecuteTime:"+lastExecuteTime); j3gDGw;
//System.out.print(" now:"+now+"\n"); F$C6( C?
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Zh=arlk
lastExecuteTime=now; S#7YJ7
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executeUpdate(); ~HZdIPcC
} e-nA>v
else{ fpD$%.y'J
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); GJ+ ^t
} Fx9-A8oIR
} jJy:/!i
} ZJYn[\]
//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 \N,ox(f?gW
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类写好了,下面是在JSP中如下调用。 2 !s&|lI
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<% ?=VvFfv%
CountBean cb=new CountBean(); "
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); T] zEcx+e
CountCache.add(cb); =]Wi aF
out.print(CountCache.list.size()+"<br>"); h051Ol\v*
CountControl c=new CountControl(); b;k+N`
c.run(); p/.8})c1r
out.print(CountCache.list.size()+"<br>"); =!q%
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%>