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: 6`_! ?u7
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CountBean.java qe[
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/* @55bE\E?@
* CountData.java ZyHIMo|
* (~=Qufy
* Created on 2007年1月1日, 下午4:44 TP~(
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* xR*5q1j
* To change this template, choose Tools | Options and locate the template under =
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* the Source Creation and Management node. Right-click the template and choose YfTd
* Open. You can then make changes to the template in the Source Editor. #D=
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*/ |~ z8<
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package com.tot.count; [&1iF1)4
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/** `x2fp6
* 9@(O\ xr
* @author $/NGNkl[
*/ =ZCH1J5"
public class CountBean { 6].yRNy"
private String countType; :|?~B%-p[
int countId; _u#/u2<
/** Creates a new instance of CountData */ | \AbL!u
public CountBean() {} GA'*58
public void setCountType(String countTypes){ +F1]M2p]
this.countType=countTypes; "B3iX@C
} %T3j8fC{s
public void setCountId(int countIds){ g ^D)x[
this.countId=countIds; +`Q
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} bk/.<Rt
public String getCountType(){ X4Pm)N`
return countType; db{NKwpj'
} gUksO!7^1
public int getCountId(){ M/n[&
return countId; *raIV]W3
} |M[v493\
} #B}BI8o (
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CountCache.java w:m'uB%W
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/* 0|],d?-h
* CountCache.java ZkJY.H-F
* ,2=UuW"K
* Created on 2007年1月1日, 下午5:01 5"76R
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* (Q}PeKM?jq
* To change this template, choose Tools | Options and locate the template under &M!4]pow
* the Source Creation and Management node. Right-click the template and choose y}(_SU
* Open. You can then make changes to the template in the Source Editor. h1Ke$#$6
*/ v&t`5-e-A
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package com.tot.count; Y}V)4j
import java.util.*; ,U|u-.~ZU
/** wZ
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* kcg)_]~6
* @author r?Ev.m
*/ 9`nP(~
public class CountCache { &* V0(
public static LinkedList list=new LinkedList(); ,Ut!u)
/** Creates a new instance of CountCache */ `^s]?
public CountCache() {} Y\Fuj)
public static void add(CountBean cb){ kMwIuy
if(cb!=null){ @Z3[c[D)9
list.add(cb); (P]^8qc
} 4YU 1Kr4
} 30gZ_8C>}
} 1s^$oi}
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CountControl.java MkluK=$
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/* T }8r;<P6
* CountThread.java ?kT~)k
* PBPJ/puW
* Created on 2007年1月1日, 下午4:57 (rY1O:*S
* d-A%ZAkE]
* To change this template, choose Tools | Options and locate the template under R'1vjDuv
* the Source Creation and Management node. Right-click the template and choose H|(*$!~e
* Open. You can then make changes to the template in the Source Editor. X*p:&=o
*/ Og%zf1)aZM
#!<+:y'S?
package com.tot.count; o/i5e=9[y
import tot.db.DBUtils; ]UpHD.Of[t
import java.sql.*; c'wU O3S
/** }E)8soQR
* *$WiJ3'(m
* @author HzO0K=Z=R0
*/ .DV#-tUh
public class CountControl{ ND99g
private static long lastExecuteTime=0;//上次更新时间 SqT"/e]b'
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 tM?I()Y&P
/** Creates a new instance of CountThread */ "_% 0|;
public CountControl() {} ;jY'z5PH5
public synchronized void executeUpdate(){ 5]2!Bb6>
Connection conn=null; Zj /H3,7
PreparedStatement ps=null; *FG4!~<e
try{ ="[+6X
conn = DBUtils.getConnection(); 1{uDHB
conn.setAutoCommit(false); A`r$fCt1Vi
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");
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for(int i=0;i<CountCache.list.size();i++){ Z!5m'yZO
CountBean cb=(CountBean)CountCache.list.getFirst(); 94>7-d
CountCache.list.removeFirst(); 5xn0U5U
ps.setInt(1, cb.getCountId()); ?eg@
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ps.executeUpdate();⑴ rj`.hXO
//ps.addBatch();⑵ B )3SiU
} 9#=IrlV4
//int [] counts = ps.executeBatch();⑶ Se]t;7j
conn.commit(); \Jj'60L^
}catch(Exception e){ |GLn
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e.printStackTrace(); d ;Gm {g#
} finally{ a0v1LT6
try{ ^SL}wC x
if(ps!=null) { `S!uj <-
ps.clearParameters(); TlZlE^EE<
ps.close(); }X.8.S'
ps=null; p44uozbK
} F@*r%[S/
}catch(SQLException e){} u/{_0-+P
DBUtils.closeConnection(conn); 9?mOLDu}Q0
} :ftyNaq'
} w}KcLaI
public long getLast(){ cF>;f(X
return lastExecuteTime; ovRCF(Og,
} C@:N5},]
public void run(){ V:$1o
long now = System.currentTimeMillis(); <P)%Ms
if ((now - lastExecuteTime) > executeSep) { 'bqf?3W
//System.out.print("lastExecuteTime:"+lastExecuteTime); SEn8t"n
//System.out.print(" now:"+now+"\n"); Y&:\s8C
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); C3`.-/{D"
lastExecuteTime=now; #T#FUI1p
executeUpdate(); dL Py%q
} i3\oy`GJ
else{ JL*]9$o
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Dl!'_u
} ^|axt VhMO
} sg~/RSJ3
} *h8XbBZH
//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 a\.?{/
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类写好了,下面是在JSP中如下调用。 $7ME a"a
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<% 2FtEt+A+'
CountBean cb=new CountBean(); {:!SH6 ff
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); C]@B~X1H^
CountCache.add(cb); 2yg'?tpj
out.print(CountCache.list.size()+"<br>"); )FiU1E
CountControl c=new CountControl(); p~y
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c.run(); WxI]Fcb<
out.print(CountCache.list.size()+"<br>"); ~wV98u-N
%>