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: Hx$c
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CountBean.java
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/* 9x+<Ik
* CountData.java qC!&x,}3
*
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* Created on 2007年1月1日, 下午4:44 v6\F
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* p1c3Q$>i
* To change this template, choose Tools | Options and locate the template under >MJ?g-
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. 0tk#Gs[
*/ VCy5JH
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package com.tot.count; YJxw 'U
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/** p#f+P?
* AGA`fRVx
* @author G= ^X1+_
*/ ,a?\MM9$
public class CountBean { 1p`+
private String countType; SvvUkQ#1w
int countId; C}IbxKl
/** Creates a new instance of CountData */ {J/I-=CmML
public CountBean() {} zq5'i!s !0
public void setCountType(String countTypes){ z<gu00U7
this.countType=countTypes;
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}
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public void setCountId(int countIds){ Q
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this.countId=countIds; +&KQ28r
} bshGS8O
public String getCountType(){ weMww,: ^[
return countType; ?j7vZ}iRi
} Rd+P,PO
public int getCountId(){ +a=
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return countId; #n\C
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} y'ja< 1I>
} wxLXh6|6%_
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CountCache.java $3=:E36K
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/* bt+,0\Vg5
* CountCache.java
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* Hg}I]!B
* Created on 2007年1月1日, 下午5:01 {mE! Vf
* p<WFqLe(":
* To change this template, choose Tools | Options and locate the template under 7=4 A;Ybq
* the Source Creation and Management node. Right-click the template and choose VVWM9x
* Open. You can then make changes to the template in the Source Editor. q&'Lbxc>c
*/ /.5;in
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package com.tot.count; E&
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import java.util.*; A CNfS9M_w
/** 2=PBxDs;
* ghk5rl$
* @author e`{0d{Nd
*/ @D`zKYwX1
public class CountCache { i`%.
public static LinkedList list=new LinkedList(); ;)DzCc/
/** Creates a new instance of CountCache */ z}}]jR\y?
public CountCache() {} ]Gc3Ea;4
public static void add(CountBean cb){ g(0;[#@
if(cb!=null){ P2n2Qt2
list.add(cb); MrE<vw@he
} Ni[4OR$-O
} UkR3}{i
} A,~Hlw
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CountControl.java .&,[,
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/* *2u
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* CountThread.java 8dT'xuch
* :s8A:mx
* Created on 2007年1月1日, 下午4:57 }\v^+scD
* 5IMSNGS
* To change this template, choose Tools | Options and locate the template under {g/wY%u=
* the Source Creation and Management node. Right-click the template and choose dGH_ z8
* Open. You can then make changes to the template in the Source Editor. 1TqF6`;+
*/ 0/]_nd
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package com.tot.count; %|3e.1oX
import tot.db.DBUtils; }IUP5O6
import java.sql.*; <z#BsnjW{
/** Zcd7*EBdx
* twqFs
* @author 2?i\@r@E|
*/ ZcPUtun
public class CountControl{ m^!Sv?hV
private static long lastExecuteTime=0;//上次更新时间 yYAnwf
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 }$&WC:Lg
/** Creates a new instance of CountThread */ s*,cF6
public CountControl() {} eVnbRT2y&
public synchronized void executeUpdate(){ si/er"&o
Connection conn=null; qc!xW,I
PreparedStatement ps=null; 4sY[az
try{ 9rj('F&1
conn = DBUtils.getConnection(); OKY+M^PP
conn.setAutoCommit(false); 5S/>l_od$2
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); L@|#Bbmx
for(int i=0;i<CountCache.list.size();i++){ 0*(K DDv
CountBean cb=(CountBean)CountCache.list.getFirst(); |uha 38~
CountCache.list.removeFirst(); *Jnh";~b
ps.setInt(1, cb.getCountId()); |paP<$
ps.executeUpdate();⑴ `\FI7s3b
//ps.addBatch();⑵ . A<sr
} +80 2`eax
//int [] counts = ps.executeBatch();⑶ iV)ac\
conn.commit(); UC9{m252
}catch(Exception e){ !y vJpdsof
e.printStackTrace(); (:?&G9k
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} finally{ 'tWAu I
try{ o<4D=.g7D
if(ps!=null) { [%.18FWI
ps.clearParameters(); n! .2aq
ps.close(); yuNfhK/#r
ps=null; DA <ynBQ
} n85r^W
}catch(SQLException e){} RebTg1vGu
DBUtils.closeConnection(conn); N^$9;CKP=
} !P|5#.eC
} 2,AaP*,
public long getLast(){ D3?N<9g
return lastExecuteTime; Qyj(L[K J
} N~g%wf@w
public void run(){ ?:}Pa<D&K
long now = System.currentTimeMillis(); SMq9j,k
if ((now - lastExecuteTime) > executeSep) { qc0 B<,x7
//System.out.print("lastExecuteTime:"+lastExecuteTime); atnQC
//System.out.print(" now:"+now+"\n"); ('WY5Yps
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); D9^7m
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lastExecuteTime=now; oeNzHp_
executeUpdate(); #\b ;2>
} agY5Dg7
else{ Kfjryo9
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ="lI i$>O
} 8IWwjyRr
} *CUdGI&
} lwsbm D
//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 aY j%w
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类写好了,下面是在JSP中如下调用。 h*'d;_(,
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<% ]31$KBC
CountBean cb=new CountBean(); F50JJZ
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); eUs-5
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CountCache.add(cb); ;f(n.i
out.print(CountCache.list.size()+"<br>"); =jUnM>23
CountControl c=new CountControl(); 56ZrCr
c.run(); jM\ %$_/
out.print(CountCache.list.size()+"<br>"); DyX0xx^
%>