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: ~= 9Vv
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CountBean.java gHH&IzHF
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/* b+$o4l/x
* CountData.java F?2FITi_V
* qRUCnCZs
* Created on 2007年1月1日, 下午4:44 'wE\{1~_[+
* ]L]T>~X`
* To change this template, choose Tools | Options and locate the template under |>JmS
* the Source Creation and Management node. Right-click the template and choose 24|<<Xn
* Open. You can then make changes to the template in the Source Editor. ;$6x=uZ
*/ a(Sv,@/
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package com.tot.count; Lw*1 .~
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/** r`>~Lp`
* J[+Tj@n'
* @author TAAR'Jz S
*/ >C^/,/%v
public class CountBean { 0#
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private String countType; P%jkKE?B4
int countId; [Yoa"K
/** Creates a new instance of CountData */ Ltg-w\?]
public CountBean() {} 7 s-`QdWX
public void setCountType(String countTypes){ y[p6y[r*
this.countType=countTypes; Bfn]-]>sD
} CRd_}
public void setCountId(int countIds){ {jUvKB_x
this.countId=countIds; Ps |QW
} "o<D;lO
public String getCountType(){ _DrnL}9I7
return countType; o3= .T+B
} :+1bg&wQ
public int getCountId(){ JOgmF_(>Z
return countId; r'PE5xqF
} lYdQB[l
} jqqaw
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CountCache.java :%>oe> _"
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/* q|/!0MU"
* CountCache.java {V=vnL--
* =_pmy>_z
* Created on 2007年1月1日, 下午5:01 Lqq*Nr
* Q%$i@JH`m
* To change this template, choose Tools | Options and locate the template under M3PVixli3
* the Source Creation and Management node. Right-click the template and choose Ol_/uy1r[
* Open. You can then make changes to the template in the Source Editor. l]/> `62
*/ 7j95"mI
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package com.tot.count; }o{!}g9
import java.util.*; L:Ed-=|Uw
/** TA<hj[-8
* f5N<3 m=
* @author w[M5M2CF
*/ Hq79/wKj
public class CountCache { QZ:v
public static LinkedList list=new LinkedList(); myffYK,
/** Creates a new instance of CountCache */ T+3k$G[e/
public CountCache() {} a\Tr!Be,
public static void add(CountBean cb){ bL#sn_(m
if(cb!=null){ J;7s/YH^
list.add(cb); m_~y
} 9PWm@
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} u`nt\OF
} EqYz,%I%
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CountControl.java a?l_-Fi
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/* *di&%&f
* CountThread.java .;cxhgU
* e|35|I '
* Created on 2007年1月1日, 下午4:57 \}n !yYh(
* {W]bU{%.
* To change this template, choose Tools | Options and locate the template under v5P*<U Ax
* the Source Creation and Management node. Right-click the template and choose yr (g~MQ
* Open. You can then make changes to the template in the Source Editor. PlF89-
*/ *C
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package com.tot.count; tc!!W9{69
import tot.db.DBUtils; 54;l*}8Hl
import java.sql.*; t.gq5Y.[
/** PV?1g|tYv
* eR(\s_`
* @author sf<Q#ieTxY
*/ Ixyvn#ux)
public class CountControl{ Bd/}
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private static long lastExecuteTime=0;//上次更新时间 i=x.tsJ:hB
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ?hP<@L6K
/** Creates a new instance of CountThread */ \IO$+Guh
public CountControl() {} p3{x <AO/
public synchronized void executeUpdate(){ ]L[JS^#7
Connection conn=null; PjiNu.>2(
PreparedStatement ps=null; t00\yb^vJ8
try{ 6sO
conn = DBUtils.getConnection(); @Pd)
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conn.setAutoCommit(false); .ou!g&xu
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 8 /5sv
for(int i=0;i<CountCache.list.size();i++){ Smi%dp.
CountBean cb=(CountBean)CountCache.list.getFirst(); H^]Nmd8Q)
CountCache.list.removeFirst(); ce 7Yr*ZB
ps.setInt(1, cb.getCountId()); L?AM&w-cg9
ps.executeUpdate();⑴ -ryDsq
//ps.addBatch();⑵ Tyg$`\#
} ^ uKnP>*l
//int [] counts = ps.executeBatch();⑶ Fc34Y0_A
conn.commit(); ppPG+[ cz
}catch(Exception e){ ]Y?{$M
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e.printStackTrace(); bS_y_9K
} finally{ !hwzKm=%N
try{ ^aGZJiyJ
if(ps!=null) { 3P%w-qT!N
ps.clearParameters(); )Ix-5084
ps.close(); %AzPAWcN
ps=null; PU,6h}
} wUh3Hd'
}catch(SQLException e){} -lJx%9>
DBUtils.closeConnection(conn); y|&.v<
} BnKP7e
} ]}UeuF\
public long getLast(){ u=_bM2;~Z
return lastExecuteTime; 5bu[}mJ
} .5jnKU8NF
public void run(){ 7.w*+Z>z
long now = System.currentTimeMillis(); ]
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if ((now - lastExecuteTime) > executeSep) { [=]+lei
//System.out.print("lastExecuteTime:"+lastExecuteTime); 7,) 67G;
//System.out.print(" now:"+now+"\n"); )*psDjZ7*
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); P5yJO97
lastExecuteTime=now; qcR|E`k-G
executeUpdate(); t~+{Hr) #y
} RT8_@8
else{ c,3'wnui
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0})7of
} Wto@u4
} `'A(`. CL
} CF4Oh-f
//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 _WRR
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类写好了,下面是在JSP中如下调用。 kxr6sO~
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<% gQ[]
CountBean cb=new CountBean(); 97:t29N
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Fy4<
CountCache.add(cb); D[>XwL
out.print(CountCache.list.size()+"<br>"); IS5.i95m
CountControl c=new CountControl(); mG}^'?^K
c.run(); 2|T|K?R^
out.print(CountCache.list.size()+"<br>"); *_2O*{V
%>