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: vdQoJWuB
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CountBean.java WzMYRKZ
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/* 0}{xH
* CountData.java [3%mNNk
* M>Q]{/V7T
* Created on 2007年1月1日, 下午4:44 *Ak .KBg
* f0<zK!
* To change this template, choose Tools | Options and locate the template under md!6@)S-p
* the Source Creation and Management node. Right-click the template and choose 1GY2aZ@
* Open. You can then make changes to the template in the Source Editor. V5|ANt
*/ [U\?+@E*
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package com.tot.count; s6H'}[E<
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/** 1^iBS
* 8HF^^Cva
* @author ?b7\m":'
*/ L'e_?`!:
public class CountBean { `i7r]
private String countType; U=>S|>daR
int countId; .
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/** Creates a new instance of CountData */ p!.~hw9
public CountBean() {} ~%{2Z_t$
public void setCountType(String countTypes){ n ]ikc|
this.countType=countTypes; XtF
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} DwD$T%kF
public void setCountId(int countIds){ b7Y g~Lw
this.countId=countIds; xO$P
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} @hLkU4S
public String getCountType(){ Cs $5Of(
return countType; pYO =pL^Q
} \& JZ
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public int getCountId(){ qnm_#!&uHT
return countId; (8 nv&|
} h}b:-a
} 8hRcB[F~S
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CountCache.java Iv`IJQH>
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/* 9I/b$$?D
* CountCache.java yMs!6c*
* S0$^|/Sr
* Created on 2007年1月1日, 下午5:01 Sb.8d]DW
* :t?B)
* To change this template, choose Tools | Options and locate the template under }r}*=;Ea
* the Source Creation and Management node. Right-click the template and choose sFU< PgV
* Open. You can then make changes to the template in the Source Editor. =TB_|`5;j
*/ &H(yLd[
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package com.tot.count; jU,Xlgz(A
import java.util.*; j!;LN)s@?
/** W{p}N
* LiJYyp
* @author 37AVk`a
*/ 5>532X(0
public class CountCache { 9+.wj/75
public static LinkedList list=new LinkedList(); nhI+xqfn
/** Creates a new instance of CountCache */ %E?Srs}j
public CountCache() {} Vns3859$8
public static void add(CountBean cb){ vSzpx
if(cb!=null){ t0)1;aBZ
list.add(cb); VK}4<u
} 8&<:(mAP
} rTD +7
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} O"m7r ds
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CountControl.java MDMd$]CW
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/* lH-VqkR\
* CountThread.java )m%uSSx#
* 6Z\ aJ
* Created on 2007年1月1日, 下午4:57 'o$j~Mr
* {I#_0Q,i
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose b UG,~\Z
* Open. You can then make changes to the template in the Source Editor. 16NHzAQ
*/ ?HEqv$n
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package com.tot.count; Y$'j9bUJ
import tot.db.DBUtils; CEy\1D
import java.sql.*; f@*69a8
/** sqkWQ`Ur
* ~uQ*u.wi
* @author ttP7-y
*/ gt kV=V
public class CountControl{ ^W |YE72Y
private static long lastExecuteTime=0;//上次更新时间 kUT2/3Vi
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 K;K0D@>]HR
/** Creates a new instance of CountThread */ 6Yai?*.Q
public CountControl() {} ;?h[WIy
public synchronized void executeUpdate(){ MBLZ:A |
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Connection conn=null; xJq|,":gj
PreparedStatement ps=null; D:P(;
try{ qpQ;,8X-"
conn = DBUtils.getConnection(); 9#8vPjXW}.
conn.setAutoCommit(false); )>a~ %~:
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); RQ+, 7Ir
for(int i=0;i<CountCache.list.size();i++){ !V|{(>+<
CountBean cb=(CountBean)CountCache.list.getFirst(); }1a}pm2p
CountCache.list.removeFirst(); ["Zvwes#7
ps.setInt(1, cb.getCountId()); G|i0n
ps.executeUpdate();⑴ \S}/2]* 1
//ps.addBatch();⑵ zAgX{$/Fg
} R >x d*A
//int [] counts = ps.executeBatch();⑶ Y;'<u\^M"
conn.commit(); D
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}catch(Exception e){ (
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e.printStackTrace(); *&U~Io"U
} finally{ [6GYYu\
try{ >hunV'vu'
if(ps!=null) { %9-^,og
ps.clearParameters(); D(b01EQ;d
ps.close(); fk*(8@u>
ps=null; -L2.cN_
} E'iE#He
}catch(SQLException e){} $5nMD=
DBUtils.closeConnection(conn); qs4jUm
} r@G*Fx8Z
} !gh8 Qs
public long getLast(){ r$jWjb
return lastExecuteTime; \w9}O2lL
} WfPb7T
public void run(){
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long now = System.currentTimeMillis(); zJQh~)
if ((now - lastExecuteTime) > executeSep) { OB>Hiy
//System.out.print("lastExecuteTime:"+lastExecuteTime); S-t#d7'B
//System.out.print(" now:"+now+"\n"); *-VRkS-G
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); N8A)lYT]_u
lastExecuteTime=now; )JMqC+J3*t
executeUpdate(); k4+vI1Cs
} 0U42QEG2
else{ M/ S~"iD
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); <q63?Ms'
} Vl.,e1)6
} :Cq73:1\B
} NuZ2,<~9
//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 Dfs^W{YA
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类写好了,下面是在JSP中如下调用。 =Rd`"]Mnfb
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<% "@ >6<(Ki
CountBean cb=new CountBean(); +pd,gG?dW
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); p
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CountCache.add(cb); W(q3m;n
out.print(CountCache.list.size()+"<br>"); <4r8H-(%
CountControl c=new CountControl(); reu[rZ&
c.run(); %;`Kd}CO
out.print(CountCache.list.size()+"<br>"); (j}7|*.
%>