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: N+>'J23d!
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CountBean.java \j:gr>4
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/* ABWb>EZ8
* CountData.java wr@GN8e`
* (Nt[v;BnO
* Created on 2007年1月1日, 下午4:44 z<QIuq
* w~v<v&
* To change this template, choose Tools | Options and locate the template under 5fq.*1f
* the Source Creation and Management node. Right-click the template and choose OLFt;h
* Open. You can then make changes to the template in the Source Editor. @aB9%An1
*/ $5/\Z
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package com.tot.count; 3W j,}
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/** B007x{-L
* LD@7(?mlU
* @author -R@JIe_28f
*/ jlRS:$|R0
public class CountBean { oQBiPN+v.3
private String countType; !d|8'^gc
int countId; iQj2UTds3
/** Creates a new instance of CountData */ G"f du(.@
public CountBean() {} B}k'@;G
public void setCountType(String countTypes){ Q2R-z^pd
this.countType=countTypes; s;>VeD)*)
} ^^Bm$9
public void setCountId(int countIds){ .q0AoM
this.countId=countIds; R8{e&nPE
} [,\i[[<
public String getCountType(){ ~GYpat
return countType; 6 <r2*`
} )ys=+Pz
public int getCountId(){ z qO$
return countId; |<QI%Y$dr
} I W8.
} ]g7HEB.Y
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CountCache.java J2Y 3er
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/* jXH0BPa,
* CountCache.java rkP4<E-M
* yj]ML:n
* Created on 2007年1月1日, 下午5:01 Yg|l?d"
* Vy&f"4~
* To change this template, choose Tools | Options and locate the template under 1O- E],
* the Source Creation and Management node. Right-click the template and choose XzlIW&"uC
* Open. You can then make changes to the template in the Source Editor. HcDyD0;L.
*/ <Q\H
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package com.tot.count; ,Os7T 1>
import java.util.*; `J]<_0kX}%
/** d{iL?>'?^
* ^$ 8Vh=D
* @author {4o\S
*/ dqL-'
public class CountCache { Y]M^n&f
public static LinkedList list=new LinkedList(); i)GeX:
/** Creates a new instance of CountCache */ p5D5%B/
public CountCache() {} rSzQUn<
public static void add(CountBean cb){ @OBHAoz%/
if(cb!=null){ nP5d?
list.add(cb); ;7wwY$PBH
} $8EV,9^U
} Gmqs`{tc
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CountControl.java JO}#f+w}
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/* XX*'N+
* CountThread.java <[/PyNYK
* |K'Gw}fX/
* Created on 2007年1月1日, 下午4:57 B-B?Ff>
* V@LN
1|
* To change this template, choose Tools | Options and locate the template under s+(l7xH$
* the Source Creation and Management node. Right-click the template and choose :P j W:]
* Open. You can then make changes to the template in the Source Editor. NW}>pb9
*/ e~tr^$/ (
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package com.tot.count; ev)rOcOU
import tot.db.DBUtils; ',L{CQA?c
import java.sql.*; cZCGnzy
/** )RpqZe/h4
* J(3gT}z-
* @author NvEm,E\|
*/ Jsl k
public class CountControl{ / c4;3>IS
private static long lastExecuteTime=0;//上次更新时间 L"Qh_+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 j|3g(_v4W
/** Creates a new instance of CountThread */ Usa{J:
public CountControl() {} 2U=/<3;u
public synchronized void executeUpdate(){ #
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Connection conn=null; MLkL.1eGSb
PreparedStatement ps=null; #a|6Q 8
try{ TBoM{s=.
conn = DBUtils.getConnection(); {m?K2]](
conn.setAutoCommit(false); [Ihp\!xqI
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ,\\%EZ%a
for(int i=0;i<CountCache.list.size();i++){ Bf D,z
CountBean cb=(CountBean)CountCache.list.getFirst(); /}h71V!
CountCache.list.removeFirst(); v_?s1+w
ps.setInt(1, cb.getCountId()); Fw(b1 d>E
ps.executeUpdate();⑴ $[HcHnf
//ps.addBatch();⑵ Yio>ft&g]
} # i`A4D
//int [] counts = ps.executeBatch();⑶ _A@fP[C
conn.commit(); bLU^1S8Z
}catch(Exception e){ &CB.*\0
e.printStackTrace(); w>`h3;,2
} finally{ FgFJ0fo
try{ e>])m3xvn
if(ps!=null) { VJ~X#Q
ps.clearParameters(); *` @XKK
ps.close(); =j'J
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ps=null; [H6X2yjj|
} p=mCK@
}catch(SQLException e){} RTg Q#<W8
DBUtils.closeConnection(conn); 3*X,{%
} 7G<KrKal
} a>&;K@
public long getLast(){ ain#_H
return lastExecuteTime; . Ce&9l
} J1gEjd
public void run(){ cuV8#:
i
long now = System.currentTimeMillis(); lRa
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if ((now - lastExecuteTime) > executeSep) { p]1yd;Jt
//System.out.print("lastExecuteTime:"+lastExecuteTime); okK/i
//System.out.print(" now:"+now+"\n"); q 2_N90u
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); O X5Co<u
lastExecuteTime=now; tdw\Di#m
executeUpdate(); 8xD<A|
} 8osS OOzM
else{ U- *8%>Qp
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "2#-xOCO
} )JY_eG&2Dx
} i&}zcGC
} 1Rb XM n
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ^.Ih,@N6
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类写好了,下面是在JSP中如下调用。 @^y?Bh9jQ
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<% zDvP7hl
CountBean cb=new CountBean(); 7 BnenHD
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); [6&CloY3
CountCache.add(cb); xnRp/I
out.print(CountCache.list.size()+"<br>"); sw=JUfAhy
CountControl c=new CountControl();
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c.run(); R$T[%AGZ.
out.print(CountCache.list.size()+"<br>"); 5Sm 5jRr
%>