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: .!1S[
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CountBean.java R)F;py8)I
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/* j.*VJazb;
* CountData.java KhCzD[tf
* >*-FV{{
* Created on 2007年1月1日, 下午4:44 lc2 i`MC
* \A#1y\ok
* To change this template, choose Tools | Options and locate the template under j
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* the Source Creation and Management node. Right-click the template and choose |,#t^'S!
* Open. You can then make changes to the template in the Source Editor. rsF\JQk
*/ yu6`66h)
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package com.tot.count; VtzI9CD
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/** 1"pI^Ddt
* !).}u,*'no
* @author (RUT{)p[
*/ ] GHt"
public class CountBean { [/ !;_b\X
private String countType; UPc<gB
int countId; 6`0mta Q
/** Creates a new instance of CountData */ 2RqbrY n
public CountBean() {} 2$14q$eb
public void setCountType(String countTypes){ zaFt*~@X
this.countType=countTypes; za:a)U^n
} 'WI^nZM
public void setCountId(int countIds){ ybeKiv9
this.countId=countIds; 9Ro6fjjE
} \k]x;S<a
public String getCountType(){ B!dU>0&Ct
return countType; =/u%c!
} pG34Qw
public int getCountId(){ :}h>by=
return countId; rQOWLg!"
} 4B4Z])$3
} s0*0 'f
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CountCache.java xXY.AoO6
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/* rwniOQe
* CountCache.java DNR~_3Aq
* 1=|7mehL%
* Created on 2007年1月1日, 下午5:01 {^m(,K_
* ?_oF :*~\
* To change this template, choose Tools | Options and locate the template under 277ASCWLkU
* the Source Creation and Management node. Right-click the template and choose UWZa|I~:J
* Open. You can then make changes to the template in the Source Editor. e/*$^i+S
*/ m6MOW&
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package com.tot.count; E]J:~H'Er
import java.util.*; R g?1-|Tj
/** AsPx?
* n4R2^gXAw
* @author t4qej
*/ l"{Sm6:;-
public class CountCache { X*g(q0N<S
public static LinkedList list=new LinkedList(); a8dXH5_
/** Creates a new instance of CountCache */ rrnNn'
public CountCache() {} u>Rb
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public static void add(CountBean cb){ ]Ni;w]KE
if(cb!=null){ `/"nTB
list.add(cb); jYVE8Y)my
} |+:h|UIUQ
} (=16PYs
} 2[B4f7
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CountControl.java kF{*(r=.o
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/* E"%2)
* CountThread.java sowd`I~
* 4J|t?]ij|E
* Created on 2007年1月1日, 下午4:57 ?f*Q>3S)
* 3IR
^
* To change this template, choose Tools | Options and locate the template under /({;0I*!i
* the Source Creation and Management node. Right-click the template and choose 'q>2t}KG
* Open. You can then make changes to the template in the Source Editor. `^(jm
*/ `k;KBW
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package com.tot.count; FG%j{_Ez
import tot.db.DBUtils; \dlph
import java.sql.*; X 6lH|R
/** ;' nL:\
* :s-o0$PlJ
* @author E RdL^T>
*/ '.Ym!r~wL
public class CountControl{ A])P1c. 7"
private static long lastExecuteTime=0;//上次更新时间 KECElK3uj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2b=)6H1
/** Creates a new instance of CountThread */ B51kV0
public CountControl() {} LhzMAW<L4
public synchronized void executeUpdate(){ RA],lNs
Connection conn=null; Z~6[ Z
PreparedStatement ps=null; o<l 2 r
try{ mmEp'E
conn = DBUtils.getConnection(); Q}*y$se!
conn.setAutoCommit(false); ]DvO:tM
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); o5Y2vmz?9
for(int i=0;i<CountCache.list.size();i++){ F52B~@.
CountBean cb=(CountBean)CountCache.list.getFirst(); T;\^#1
CountCache.list.removeFirst(); zSv^<`X3
ps.setInt(1, cb.getCountId()); J4tcQ
ps.executeUpdate();⑴ a$9A(Pte
//ps.addBatch();⑵ mxFn7.|r~
} =q(GHg;'
//int [] counts = ps.executeBatch();⑶ w%c
conn.commit(); maSgRf[g
}catch(Exception e){ 'PlaM Oy
e.printStackTrace(); 4'Xgk8)
} finally{ C;Ic
try{ J$9:jE-4
if(ps!=null) { u/Fj'*M
ps.clearParameters(); V&Mf:@y
ps.close(); .5> 20\b2
ps=null; Nf9fb?
} y69J%/c
ra
}catch(SQLException e){} P20|RvE
DBUtils.closeConnection(conn); k_GP>b\"k
} p|XAlia
} 8I+d)(:
public long getLast(){ g):]'
return lastExecuteTime; ?Qqd "=k4
} va|rO#.=
public void run(){ 'GJVWpvUU
long now = System.currentTimeMillis(); M R'o{?{e`
if ((now - lastExecuteTime) > executeSep) { n&-496H
//System.out.print("lastExecuteTime:"+lastExecuteTime); *~z#.63oZ
//System.out.print(" now:"+now+"\n"); >qn/<??
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 7ODaX.t->
lastExecuteTime=now; -DO&