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: #`mo5
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CountBean.java O9k9hRE]z
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/* ~sQN\]5VW
* CountData.java ##!)}i
* wKCHG/W
* Created on 2007年1月1日, 下午4:44 y$At$i>u
* DT@6Q.
* To change this template, choose Tools | Options and locate the template under \@4_l?M
* the Source Creation and Management node. Right-click the template and choose 5"5D(
* Open. You can then make changes to the template in the Source Editor. 8uX1('+T*
*/ B;?"R
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package com.tot.count; ,"u-V<>6O
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/** wNW9xmS
* mlY0G w_e
* @author 8_K22]c5
*/ Q+[e)YO)
public class CountBean { RTNUHz;{L
private String countType; ]cnLJ^2
int countId; MX?K3=j @>
/** Creates a new instance of CountData */ "}]1OL S V
public CountBean() {} pCNihZ~
public void setCountType(String countTypes){
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this.countType=countTypes; ":*PC[)W
} ;jTP|q?|{
public void setCountId(int countIds){ ++:v O
this.countId=countIds; B8_w3;x
} ubIGs|p2c
public String getCountType(){ Cd#>,,\z
return countType; 1@kPl[`p'
} jl=<Q.Mm7
public int getCountId(){ 5o5y3ibQ
return countId; )>Oip
} +'?p $@d
} -tSWYp{
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CountCache.java Pt?]JJxl-
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/* B3'qmi<
* CountCache.java @xW)&d\'
* d(w
$! $"h
* Created on 2007年1月1日, 下午5:01 u7&r'rZ1_!
* 5DfAL;o!
* To change this template, choose Tools | Options and locate the template under <$n%h/2%
* the Source Creation and Management node. Right-click the template and choose WJZW5
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* Open. You can then make changes to the template in the Source Editor. mk1;22o{TX
*/ SM5i3EcFYP
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package com.tot.count; oq=D9
import java.util.*; ~<3qsA..
/** k`r}Gb
* :*e0Z2=
* @author 8f% @
*/ viAvD6e
public class CountCache { N7*JL2Rnq
public static LinkedList list=new LinkedList(); ]YZ+/:#U7
/** Creates a new instance of CountCache */ -3X#$k8
public CountCache() {} =eSG7QfS
public static void add(CountBean cb){ 7Rj!vj/
if(cb!=null){ ,*r"cmz
list.add(cb); tq?lF$mM:
} |^Z1 D TAw
} L*9^-,
} VY@uQ#&A
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CountControl.java N<:5 r
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/* d5]9FIj
* CountThread.java Y*O7lZuF%
* S)z
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* Created on 2007年1月1日, 下午4:57 ,:QG%Et
* [bJ/$A
* To change this template, choose Tools | Options and locate the template under e%j+,)Ry
* the Source Creation and Management node. Right-click the template and choose :KZI+
* Open. You can then make changes to the template in the Source Editor. 7CABM
*/ ^v3ytS
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package com.tot.count; tsU.c"^n
import tot.db.DBUtils; //:.k#}~B
import java.sql.*; h/`OG>./
/** Oe^3YOR#j{
* Vy{=Y(cpF2
* @author
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*/ ?b:J6(-
public class CountControl{ {.z2n>1J{T
private static long lastExecuteTime=0;//上次更新时间 AShJtxxa
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 |t|+pBB
/** Creates a new instance of CountThread */ z['>`Kt
public CountControl() {} *4r
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public synchronized void executeUpdate(){ ];^A8?
Connection conn=null; RM-|?%
PreparedStatement ps=null; `Ten2(D
try{ Wk'KN o
conn = DBUtils.getConnection(); abWmPi
conn.setAutoCommit(false); rZe"*$e
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); oGly|L>
for(int i=0;i<CountCache.list.size();i++){ ,y3o ,gl
CountBean cb=(CountBean)CountCache.list.getFirst(); 57)S"
CountCache.list.removeFirst(); vAq`*]W+
ps.setInt(1, cb.getCountId()); $uawQf+S
ps.executeUpdate();⑴ D<#+ R"
//ps.addBatch();⑵ `.Y["f
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} Mvrc[s+o
//int [] counts = ps.executeBatch();⑶ 7<AHQ<#@
conn.commit(); [L|H1ll
}catch(Exception e){ AGn:I??
e.printStackTrace(); DL|,:2`
} finally{ 9]VUQl9gh
try{ <dD}4c+/t
if(ps!=null) { ~kYUp5f
ps.clearParameters(); ?BQZ\SXU
ps.close(); ?@(_GrE-
ps=null; [E2afC>zrl
} 23qTmh
}catch(SQLException e){} R"Hhc(H
DBUtils.closeConnection(conn); :+/V
} cG,B;kMjo
} fg%I?ou
public long getLast(){ kG
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return lastExecuteTime; kW4/0PD
} -wC;pA#o
public void run(){ z6B/H2
long now = System.currentTimeMillis(); '[~NRKQJ
if ((now - lastExecuteTime) > executeSep) { ={W;8BUV%^
//System.out.print("lastExecuteTime:"+lastExecuteTime); "dXRUg"
//System.out.print(" now:"+now+"\n"); 4!d&Zc>C4
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 782be-n
lastExecuteTime=now; `&4L'1eF{
executeUpdate(); K!5QFO4
} vO%n~l=
else{ p8oOm>B96n
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); x$J1%K*
} _,=A\C_b@
}
@~U: |h
} 92WvD
//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 >1,.4)k%K
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类写好了,下面是在JSP中如下调用。 8*H-</ =
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<% EJ.oq*W!*J
CountBean cb=new CountBean(); hewX)
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); x
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CountCache.add(cb); U voX\
out.print(CountCache.list.size()+"<br>"); GX&BUP\
CountControl c=new CountControl(); =_\5h=`Yx
c.run(); "8&pT^
out.print(CountCache.list.size()+"<br>"); 7!#x-KR~5
%>