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: }ZR3
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CountBean.java #gi&pR'$
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/* J#'c+\B<2X
* CountData.java 1/j}VC
* Y }e$5
* Created on 2007年1月1日, 下午4:44 YzEa?F*$
* gIRFqEz@o
* To change this template, choose Tools | Options and locate the template under 9>[$;>
* the Source Creation and Management node. Right-click the template and choose ;~xkT'
* Open. You can then make changes to the template in the Source Editor. OG}0{?
*/ //|9J(B]
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package com.tot.count; <fN?=u+
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/** 4sROMk=l
* U4^dDj
* @author VYlg+MlT0
*/ *|hICTWL
public class CountBean { .B>|>W O
private String countType; 6t*=.b,N
int countId; CDR^xo5
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/** Creates a new instance of CountData */ N=:yl/M
public CountBean() {} WYI? M
public void setCountType(String countTypes){ Z`<
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this.countType=countTypes; =d(
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)
} 85Ms*[g
public void setCountId(int countIds){ ?Tb'J`MO
this.countId=countIds; aD0w82s]J
} 5.5dB2w
public String getCountType(){ ou96
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return countType; qlDLZ.
} M!mTNIj8~
public int getCountId(){ PP$Ig2Q
return countId; 'p Z~3q
} qdUlT*fw
} @{XN}tWDOp
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CountCache.java \h_hd%'G
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/* ,cgC_%
* CountCache.java LOe!qt\&
* aLq=%fsV)
* Created on 2007年1月1日, 下午5:01 [y>Q3UqN
* ]FQ4v.7
* To change this template, choose Tools | Options and locate the template under [xM07%:
* the Source Creation and Management node. Right-click the template and choose )mwY]
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* Open. You can then make changes to the template in the Source Editor. !A!zG)Ue<
*/ IcaIB)
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package com.tot.count; 2ZLK`^S
import java.util.*; cF,u)+2b|6
/** v-OGY[|97
* *GD 1[:
* @author -YSn 3=
*/ (;Lz`r'
public class CountCache { TvM{ QGN
public static LinkedList list=new LinkedList(); |%zhwDQ.
/** Creates a new instance of CountCache */ q_HD`tW
public CountCache() {} bYG}CO
public static void add(CountBean cb){ y~U+MtSf#
if(cb!=null){ <2|x]b8
list.add(cb); zA-?x1th&
} l 4~'CLi
} (Grj_p6O
} 9chiu%20
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CountControl.java MV=.(Zs
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/* EEaKT`/d
* CountThread.java /Tv<
l
* @LwhQ
* Created on 2007年1月1日, 下午4:57 :~6%nFo
* XXe7w3x{
* To change this template, choose Tools | Options and locate the template under h1)p{5}H
* the Source Creation and Management node. Right-click the template and choose $o]suF;3
* Open. You can then make changes to the template in the Source Editor. 7B7I'{d
*/ mc9$"
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package com.tot.count; SOP=
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import tot.db.DBUtils; |#!25qAT
import java.sql.*; EcwHO
/** #1m!,tC
* #gsAwna3
* @author %}$6#5"';
*/ =PO/Q|-v?
public class CountControl{ 5'oWd
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private static long lastExecuteTime=0;//上次更新时间 yd>kJk^~/
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `bt]v $
/** Creates a new instance of CountThread */ D8Ni=.ALL
public CountControl() {} 3OM\R%M
public synchronized void executeUpdate(){ ~ RTjcE
Connection conn=null; /a9+R)Al
PreparedStatement ps=null; vLpE|QZ s
try{ fI}-?@
conn = DBUtils.getConnection(); M~
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conn.setAutoCommit(false); U*1~Zf
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); TXrC5AJx
for(int i=0;i<CountCache.list.size();i++){ C'zMOR6c
CountBean cb=(CountBean)CountCache.list.getFirst(); +.>O%pNj
CountCache.list.removeFirst(); >@ EQarD
ps.setInt(1, cb.getCountId()); gB
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ps.executeUpdate();⑴ FK
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//ps.addBatch();⑵ &;%+Hduc
} %f:'A%'Qb
//int [] counts = ps.executeBatch();⑶ u6 B (f;
conn.commit(); ZE}m\|$
}catch(Exception e){ S6]D;c8GE
e.printStackTrace(); !4*@H
} finally{ u#
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try{ #*Mk@XrV
if(ps!=null) { n,V`Y'v)
ps.clearParameters(); ,pAMQ5
ps.close(); av`b8cGg
ps=null; ;7 IVg[f
} [Q^kO;
}catch(SQLException e){} IM
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DBUtils.closeConnection(conn); YjdH7.js
} UejG$JyHP
} lg!1q8
public long getLast(){ LO` (V
return lastExecuteTime; W^yF5
} kMI\GQW
public void run(){ =}Cb?C[;
long now = System.currentTimeMillis(); 2\s-4H|
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if ((now - lastExecuteTime) > executeSep) { {J99F
//System.out.print("lastExecuteTime:"+lastExecuteTime); Gjv'$O2_
//System.out.print(" now:"+now+"\n"); xRaYm
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ShSh/0
lastExecuteTime=now; {/ty{
executeUpdate(); 5_`.9@eh.
} x80~j(uVf
else{ F92n)*[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Y-,#3%bT;;
} O#k?c }
} $s)
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} VvoJ85
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 xJO[pT v
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类写好了,下面是在JSP中如下调用。 s';jk(i3
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<% 3$y]#L
CountBean cb=new CountBean(); k@wT,?kD
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 1F$a
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CountCache.add(cb); KUly"B
out.print(CountCache.list.size()+"<br>"); ?rv+ydR/q
CountControl c=new CountControl(); z:fd'NC
c.run(); hl# 9a?
out.print(CountCache.list.size()+"<br>"); xDVzHgbf
%>