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: 5rV((
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CountBean.java A?T<",bO
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/* 79yd&5#e?
* CountData.java 5+jf/}tA
* [
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* Created on 2007年1月1日, 下午4:44 @ Ehn(}
* S$^RbI
* To change this template, choose Tools | Options and locate the template under KB!|B.ChN(
* the Source Creation and Management node. Right-click the template and choose ;eZ#b jw-d
* Open. You can then make changes to the template in the Source Editor. $eBX
*/ `O8b1-1q~
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package com.tot.count; AisN@
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/** N8`4veVBx'
* DF{Qw@P!
* @author 6 Ik,zQL
*/ leiW4Fj
public class CountBean { N9rBW
private String countType; M8b4NF_&
int countId; @v*/R%rv t
/** Creates a new instance of CountData */ 5Fm=/o1
public CountBean() {} |uH%6&\
public void setCountType(String countTypes){ Px>va01n
this.countType=countTypes; Q9`QL3LQD
} a%Jx
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public void setCountId(int countIds){ 5Y3i|cj
this.countId=countIds; -sMyt HH.
} 8g>b
public String getCountType(){ [!VOw@uz
return countType; U#o'H @
} 6R29$D|HFO
public int getCountId(){ 7.+#zyF
return countId; 9=/N|m8.
} Bz`yfl2
} )P>u9=?,=E
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CountCache.java V=:_ d,
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/* ~/tKMS6T
* CountCache.java }p9F#gr
* +/+P\O
* Created on 2007年1月1日, 下午5:01 D=)f
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* T/P7F\R
* To change this template, choose Tools | Options and locate the template under d'9:$!oz
* the Source Creation and Management node. Right-click the template and choose 9><mp]E4
* Open. You can then make changes to the template in the Source Editor. r
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*/ >uI$^y1D
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package com.tot.count; 9%iFV
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import java.util.*; d=]U_+
/** s
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* bxXiQa
* @author U~2`P
*/ vY*\R0/a
public class CountCache { Yp4c'Zk
public static LinkedList list=new LinkedList(); *V;3~x!
/** Creates a new instance of CountCache */ gK3Mms]}m
public CountCache() {} n!He&
public static void add(CountBean cb){ sxED7,A
if(cb!=null){ pD@zmCU
list.add(cb); i$-#dc2qY
} sst,dA V$
} HpexH{.u)
} Ok%}|/P4
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CountControl.java ELh3^
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/* i3
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* CountThread.java v&MU=Tcqi
* r5/R5Ga^
* Created on 2007年1月1日, 下午4:57 u>Ki$xP1
* tO.$+4a
* To change this template, choose Tools | Options and locate the template under swpnuuC-
* the Source Creation and Management node. Right-click the template and choose "L2 m-e6
* Open. You can then make changes to the template in the Source Editor. 2#_38=K=@
*/ 5`E))?*"Pe
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package com.tot.count; oaDsk<(j;R
import tot.db.DBUtils; 1ZKzumF
import java.sql.*; H "+c)FGi
/** R.1Xst &i
* 2go>
* @author 1=Ilej1
*/ f8:$G.}i
public class CountControl{ p`+VrcCBOd
private static long lastExecuteTime=0;//上次更新时间 /4joC9\AB
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V_L[P9
/** Creates a new instance of CountThread */ PtKTm\,JL0
public CountControl() {} Ws49ImCB
public synchronized void executeUpdate(){ wy4q[$.4v
Connection conn=null; zb2K;%Qs+f
PreparedStatement ps=null; g*]E>SQ=
try{ a`Z{
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conn = DBUtils.getConnection(); Z-|li}lDr
conn.setAutoCommit(false); iG[?
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Ls:=A6AGM
for(int i=0;i<CountCache.list.size();i++){ :J(sXKr[C
CountBean cb=(CountBean)CountCache.list.getFirst(); @PcCiGZ
CountCache.list.removeFirst(); nJVp.*S
ps.setInt(1, cb.getCountId()); {(vOt '
ps.executeUpdate();⑴ ,{j4
//ps.addBatch();⑵ +*t|yKO>[
} TV{)n'aA
//int [] counts = ps.executeBatch();⑶ t^@T`2jL
conn.commit(); c#q"\"
}catch(Exception e){ 6d{j0?mM
e.printStackTrace(); ?TuI:dC
} finally{ "]]q} O?
try{ d]M[C[TOX
if(ps!=null) { 2X@G"
ps.clearParameters(); %N~;{!![p
ps.close(); "oE* 9J?e
ps=null; K~>jApZ%
} ~5t?C<wo
}catch(SQLException e){} 9!t4>
DBUtils.closeConnection(conn); !O\X+#j
} t>U!Zal"
} gEKO128
public long getLast(){ qB JRS'6'9
return lastExecuteTime; XU#,Bu{
} /Antb6E
public void run(){ .k]#XoE
long now = System.currentTimeMillis(); z/vDgH!s
if ((now - lastExecuteTime) > executeSep) { org*z!;.
//System.out.print("lastExecuteTime:"+lastExecuteTime); r69WD
.
//System.out.print(" now:"+now+"\n"); cTj~lO6
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); V<