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: Jx[e{o)o
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CountBean.java 20xGj?M
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/* F,$$N>
* CountData.java AyXKhj#Ml
* 5N}|VGN
* Created on 2007年1月1日, 下午4:44 BP><G^
* y,eoTmaI
* 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 uPD_s[
* Open. You can then make changes to the template in the Source Editor. <}>-ip?
*/ -PuVI5L<
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package com.tot.count;
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/** ?O]gFn
* 9_^V1+
* @author 78A4n C
*/ $w}aX0dK&
public class CountBean { ApB'O;5
private String countType; m`6`a|Twp$
int countId; _'v )Fy
/** Creates a new instance of CountData */ V^H47O;VC
public CountBean() {} 6EGEwx
public void setCountType(String countTypes){ 3Jit2W4
this.countType=countTypes; Eu_0n6J
} c=mFYsSv
public void setCountId(int countIds){ K_Gf\x
this.countId=countIds; 1Ee>pbd
} Xc<9[@
public String getCountType(){ hIHO a
return countType; J8[Xl.
} dTNgrW`4
public int getCountId(){ ITOGD
return countId; ? 7dDQI7^(
} RLr-xg$K-t
} 2Nszxvq,
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CountCache.java xpo}YF'5
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/* -Euy5Y
* CountCache.java uATRZMai
* <AXYqH7%A
* Created on 2007年1月1日, 下午5:01 v:ZD}Q_
* +w/o
* To change this template, choose Tools | Options and locate the template under Zz ?y&T
* the Source Creation and Management node. Right-click the template and choose x@x@0k`A2
* Open. You can then make changes to the template in the Source Editor. TMs\#
*/ [r~lO@
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package com.tot.count; {=Y&q~:8v
import java.util.*; CF4y$aC#
/** $t?e=#G
* e1a %Rj~
* @author =sJHnWL[
*/ [C#pMLp,~
public class CountCache { *]k"H`JoFC
public static LinkedList list=new LinkedList(); n*|-"'j
/** Creates a new instance of CountCache */ Fs~-exY1
public CountCache() {} "R]K!GUU
public static void add(CountBean cb){ `hhG^O_
if(cb!=null){ u-<s@^YG
list.add(cb); L~zet-3UNf
} 6ns_4,
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} +d15a%^`
} ZaV@}=Rd8
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CountControl.java {hR23eE)#
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/* /267Q;d
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* CountThread.java EORAx
* 8t"DQ Y-R
* Created on 2007年1月1日, 下午4:57 /otgFQ_
* D[?|\?
* To change this template, choose Tools | Options and locate the template under F!<x;h(
* the Source Creation and Management node. Right-click the template and choose 8hY)r~!b'
* Open. You can then make changes to the template in the Source Editor. G
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*/ 1gr jK.x
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package com.tot.count; &0TheY;srf
import tot.db.DBUtils; ;U4X
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import java.sql.*; Hs` '](
/** HBu>BSv:
* :-8u*5QK]`
* @author mUw,q;{
*/ iE5^Xik,
public class CountControl{ `VbG%y&I
private static long lastExecuteTime=0;//上次更新时间 XDQ1gg`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 YKk%;U*
/** Creates a new instance of CountThread */ t~M_NEPxV
public CountControl() {} $P~ a
public synchronized void executeUpdate(){ :'=C/AL
Connection conn=null; i=UJ*c
PreparedStatement ps=null; )}v2Z3:
try{ + u+fEg/A
conn = DBUtils.getConnection(); ^~od*:
conn.setAutoCommit(false); bHNaaif}P
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [8n4lE[)"
for(int i=0;i<CountCache.list.size();i++){ wz=I+IN:
CountBean cb=(CountBean)CountCache.list.getFirst(); Gz:a1-x
CountCache.list.removeFirst(); h:wD
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ps.setInt(1, cb.getCountId()); [%y D,8
ps.executeUpdate();⑴ M`F L&Ac
//ps.addBatch();⑵ G Kr
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} 4RNzh``u
//int [] counts = ps.executeBatch();⑶ }"v"^5
conn.commit(); >XN&QVE
}catch(Exception e){ J)_42Z
e.printStackTrace(); $Re
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} finally{ &iivSc;#
try{ ljRR
if(ps!=null) { 'UKB
pm/
ps.clearParameters(); Nt?B(.G
ps.close(); FE.:h'^h
ps=null; K9iR>put
} AmHIG_'
}catch(SQLException e){} k,J?L-F
DBUtils.closeConnection(conn); #Bjnz$KB
} Qpc>5p![3
} XR(kR{yo
public long getLast(){ t1S\M%?
return lastExecuteTime; SV >EB;<
} 3yDvr*8-@
public void run(){ j<u`W|vl
long now = System.currentTimeMillis(); _'Z@ < ,L
if ((now - lastExecuteTime) > executeSep) { f32nO
//System.out.print("lastExecuteTime:"+lastExecuteTime); r=;k[*;{
//System.out.print(" now:"+now+"\n"); M*Xzr .6
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); BH^q.p_#>X
lastExecuteTime=now; 9b>a<Z
executeUpdate(); (msJ:SG
} &%<G2x$
else{ Om*Dy}
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ?p]w_l
} +9t@eHJT1
} fsu'W]f
} FK>rc3 q
//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 mb/Y
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类写好了,下面是在JSP中如下调用。 .+.Pc_fv
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<% i*3'O:Gq
CountBean cb=new CountBean(); 0T*jv! q>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); /$E1!9J
CountCache.add(cb); BTB,a$P/
out.print(CountCache.list.size()+"<br>"); JkTL+obu
CountControl c=new CountControl(); rz(DZ V
c.run(); gg =z.`}
out.print(CountCache.list.size()+"<br>"); 98l#+4+
%>