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: S\h5
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CountBean.java CxeW5qc
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/* JC%&d1
* CountData.java 4MS#`E7LrC
* s:7/\h
* Created on 2007年1月1日, 下午4:44 h Fik>B#!
* Hc=QSP
* To change this template, choose Tools | Options and locate the template under ghWWJx9
* the Source Creation and Management node. Right-click the template and choose %2T
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* Open. You can then make changes to the template in the Source Editor. h#"$W;(
*/ 7]xDMu'^&f
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package com.tot.count; 6IG?t
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/** ^L5-2;s<U'
* 3q}j"x?
* @author w+>+hq
*/ \OA{&G.
public class CountBean { VO8rd>b4
private String countType; jOVF+9M
int countId; EC;>-s
/** Creates a new instance of CountData */ Cp(2]Eb
public CountBean() {} Nw'03Jzx_
public void setCountType(String countTypes){ ;5bd<N
this.countType=countTypes; v8*)^-Fx
} i-Rn,}v
public void setCountId(int countIds){ ;o3gR4u_L
this.countId=countIds; @]vY[O!&;
} c%C6d97q
public String getCountType(){ >i,_qe?V:w
return countType; RC/ 3\'
} 4_kN';a4Q
public int getCountId(){ zk
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return countId; N=BG0t$
} (_zlCHB
} *$ g!/,
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CountCache.java M/quswn1
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/* *u1q7JFQk
* CountCache.java Si>38vCJ*
* VFL^-tXnA^
* Created on 2007年1月1日, 下午5:01 g w([08
* A,9JbX
* To change this template, choose Tools | Options and locate the template under |MFAP!rycS
* the Source Creation and Management node. Right-click the template and choose Sy|GM~
* Open. You can then make changes to the template in the Source Editor. 4MzQH-U>/
*/ h9)fXW
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package com.tot.count; WHY/x /$
import java.util.*; B={_}f
/** )pH+ibR
* m4 (pMrJ
* @author n?.; *:
*/ Dz: +.
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public class CountCache { &)mZ~cPU3
public static LinkedList list=new LinkedList(); Y/kq!)u;%L
/** Creates a new instance of CountCache */ hc3hU
public CountCache() {} ZOqS"3j! j
public static void add(CountBean cb){ x%=CEe?6
if(cb!=null){ FAEF
list.add(cb); ]8\I{LR
} s2{SbOBis
} Ev5~= ]
} g0tnt)]
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CountControl.java #y83tNev
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/* +7H)s
* CountThread.java $V(]z`b&
* TU0-L35P1
* Created on 2007年1月1日, 下午4:57 D=-}&w_T"
* #[#evlr=
* To change this template, choose Tools | Options and locate the template under jW\:+Taq
* the Source Creation and Management node. Right-click the template and choose ;7lON-@BI
* Open. You can then make changes to the template in the Source Editor. [yXmnrxA
*/ ^-_*@e*JE
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package com.tot.count; E$)| Kv^
import tot.db.DBUtils; WR)=VE
import java.sql.*; ^)Hf%
/** &J6`Q<U!
* N&NBn(
* @author }`B
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*/ ^HSxE
public class CountControl{ @.e X8~3=
private static long lastExecuteTime=0;//上次更新时间 R&Y_
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 <
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/** Creates a new instance of CountThread */ HY)xT$/J
public CountControl() {} y&zFS4"x
public synchronized void executeUpdate(){ [tpiU'/Zl
Connection conn=null; @f-X/q]P
PreparedStatement ps=null; !CGX \cvW
try{ "tz6O0D
conn = DBUtils.getConnection(); W%!(kN&d
conn.setAutoCommit(false); 8wsU`40=Q
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); zeHF-_{
for(int i=0;i<CountCache.list.size();i++){ U>E:
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CountBean cb=(CountBean)CountCache.list.getFirst(); Jj-\Eb?
CountCache.list.removeFirst(); 5?k5J\+
ps.setInt(1, cb.getCountId()); KNx/1lf
ps.executeUpdate();⑴ m^D'p
//ps.addBatch();⑵ DXLXGvcM
} xnY?<?J"!
//int [] counts = ps.executeBatch();⑶ $Z@*!B^
conn.commit(); /MF
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}catch(Exception e){ k&dXK
e.printStackTrace(); G]'ah1W
} finally{ Hb=#`
try{ jSY[Y:6md
if(ps!=null) { :jiuu@<
ps.clearParameters(); qVn<c,8#
ps.close(); nje7?Vz
ps=null; ,n/]ALz>~
} aOzIo-
}catch(SQLException e){} V.GM$
DBUtils.closeConnection(conn); !=dz^f.{
} 1B~O!']N<
} >v:ex(y0
public long getLast(){ ra$:ibLN
return lastExecuteTime; FU3K?A
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} .k,j64
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public void run(){ c{MoeIG)v@
long now = System.currentTimeMillis(); V?u#WJy/
if ((now - lastExecuteTime) > executeSep) { d &#_t@%
//System.out.print("lastExecuteTime:"+lastExecuteTime); v~nKO?{
//System.out.print(" now:"+now+"\n"); l 00i2w
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); b#6S8C+@
lastExecuteTime=now; ]8p{A#1
executeUpdate(); b>07t!;
} f7=MgFi
else{ y]j.PT`Cw
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); YN8x|DLi?
} g&$=Y7G
} tIuM9D{P
} *2/Jg'de
//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 ]cp b;UfM
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类写好了,下面是在JSP中如下调用。 / Q1*Vh4
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<% #A/OGi
CountBean cb=new CountBean(); OIblBQ!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); h*S"]ye5
CountCache.add(cb); }t)+eSUA
out.print(CountCache.list.size()+"<br>"); nrl?<4_
CountControl c=new CountControl(); \o>-L\`O
c.run(); /q9I^ ztV
out.print(CountCache.list.size()+"<br>"); A,~3oQV
%>