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: Qqaf\$X
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CountBean.java ]-`{kX
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/* tw')2UGg
* CountData.java ?{dno=
* +]_} \
* Created on 2007年1月1日, 下午4:44 Zj0&/S
* dk ?0r
* To change this template, choose Tools | Options and locate the template under ,J#5Y.
* the Source Creation and Management node. Right-click the template and choose x[kdQj2[&
* Open. You can then make changes to the template in the Source Editor. 7I
*/ 8vP)qy8
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package com.tot.count; vT~ a}
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/** E0PBdiD6hs
* 2g v(`NKYE
* @author vtT:c.~d
*/ m1hf[cg
public class CountBean { `jkn*:m
private String countType; }bTMeCgI
int countId; J{ Vl2P?@
/** Creates a new instance of CountData */ Z~g qTB]H
public CountBean() {} DQ}]'*@?
public void setCountType(String countTypes){ iB`m!g6$
this.countType=countTypes; -|kDa1knA
} Glr.)PA
public void setCountId(int countIds){ sig_2;
this.countId=countIds; w?C\YKF7
} PrcM'Q
public String getCountType(){ v]!7=>/2
return countType; J5"*OH:f
} hU{%x#8}lK
public int getCountId(){ EKf4f^<
return countId; k4P.}SJ?
} :[&X*bw[
} "8I4]'
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CountCache.java 8K/lpqw
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/* {%Y7]*D
* CountCache.java z=U!D `]v
* }ie]7N6;
* Created on 2007年1月1日, 下午5:01 )qIK7;
* H6eGLg={
* To change this template, choose Tools | Options and locate the template under CAA~VEUL
* the Source Creation and Management node. Right-click the template and choose L5W>in5(
* Open. You can then make changes to the template in the Source Editor. gr=`_k4~1
*/ >seB["C
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package com.tot.count; SOL=3hfb^
import java.util.*; ~83P09\T%
/** 5 $J
* qr9F
* @author [8w2U%}]
*/ 2 *$n?
public class CountCache { K&h6#[^\d
public static LinkedList list=new LinkedList(); ihVQ,Cth
/** Creates a new instance of CountCache */ Ah`dt8t
public CountCache() {} 4@I]PG
public static void add(CountBean cb){ $\
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if(cb!=null){ _u>>+6,p
list.add(cb); luT8>9X^:a
} u"jnEKN0y
} LayU)TIt
} /["T#`
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CountControl.java ,Mc2dhq
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/* 8E+l;2
* CountThread.java p rgjU
* 3@L%#]xwi
* Created on 2007年1月1日, 下午4:57 ~aG-^BAS
* (Nahtx!/9
* To change this template, choose Tools | Options and locate the template under hd;I x%tq>
* the Source Creation and Management node. Right-click the template and choose Biwdb
* Open. You can then make changes to the template in the Source Editor. $5r,Q{;$
*/ O@rb4(
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package com.tot.count; !*gAGt_
import tot.db.DBUtils; >``GDjcJ
import java.sql.*; v2{s2kB=
/** :N}KScS|Wa
* 6pR#z@,
* @author E6k&r}
*/ M'iKk[Hjfx
public class CountControl{ ~@a
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private static long lastExecuteTime=0;//上次更新时间 f,>i%.
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ex458^N_
/** Creates a new instance of CountThread */ ]o$/xP
public CountControl() {} rUjr'O0
public synchronized void executeUpdate(){ Pa +BE[z
Connection conn=null; ,m,vo_Ub
PreparedStatement ps=null; (xed(uFEK
try{ +.I'U9QeUN
conn = DBUtils.getConnection(); $4L3y
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conn.setAutoCommit(false); (?y2@I}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); IcQ!A=lB
for(int i=0;i<CountCache.list.size();i++){ ".?{Y(~
CountBean cb=(CountBean)CountCache.list.getFirst(); (K6StNtN
CountCache.list.removeFirst(); [udV }
ps.setInt(1, cb.getCountId()); CaBS0'
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ps.executeUpdate();⑴ %LHV 0u
//ps.addBatch();⑵ rbbuSI
} V?BVk8D};
//int [] counts = ps.executeBatch();⑶ Pltju4.:C
conn.commit(); iGLYM-
}catch(Exception e){ -d'|X`^nE
e.printStackTrace(); {2r7:nvR
} finally{ P*Sip?tdE
try{ |81N/]EER
if(ps!=null) { 6~WE#z_
ps.clearParameters(); ycD.:w p\'
ps.close(); YCO:bBmp:
ps=null; @98SC}}u
} w lg#c6#q
}catch(SQLException e){} 22~X~=
DBUtils.closeConnection(conn); )fc"])&8
} :w%bw\}
} bU`yymf{L
public long getLast(){ {+9\o ~
return lastExecuteTime;
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} 98'XSL|
public void run(){ #/<Y!qV&
long now = System.currentTimeMillis(); 4 GW[GT
if ((now - lastExecuteTime) > executeSep) { g}QTZT8
//System.out.print("lastExecuteTime:"+lastExecuteTime); I>Fh*2
//System.out.print(" now:"+now+"\n"); 4ZpF1Zc4B
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 5O
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lastExecuteTime=now; $#3<rcOq
executeUpdate(); z|)1l`
} [Od9,XBa
else{ .fY<"2g
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); l>Ja[`X@
} y4rJ-
} ':)j@O3-
} PJ:5Lb<
//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 $ywh%OEH
E=lfg8yb:
类写好了,下面是在JSP中如下调用。 b2%bgs
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<% y7EX&
CountBean cb=new CountBean(); 1e&b;l'*=
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); s
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CountCache.add(cb); 14!a)Ijl
out.print(CountCache.list.size()+"<br>"); ?9@Af{b t2
CountControl c=new CountControl(); I} fcFL8
c.run(); {<[tYZmj.
out.print(CountCache.list.size()+"<br>"); T)f_W
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