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: Y=rr6/k
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CountBean.java qXI30Yo#d
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/* x>J3tp$2
* CountData.java d_,tXV"z&
* RE .@ +A
* Created on 2007年1月1日, 下午4:44 V^{!d}
* v$i%>tQ\
* To change this template, choose Tools | Options and locate the template under hX_p5a1t
* the Source Creation and Management node. Right-click the template and choose w+37'vQ
* Open. You can then make changes to the template in the Source Editor. if}]8
*/ *i{.@RX?
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package com.tot.count; .zAafi0
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/** 1hviT&
* VjqdKQeVq
* @author e1loI8
*/ '&QT}B
public class CountBean { 1QJ$yr
private String countType; )A0&16<
int countId;
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/** Creates a new instance of CountData */ 0tqR wKL
public CountBean() {} ee_\_"
public void setCountType(String countTypes){ Tqa4~|6
this.countType=countTypes; 9AYe,R
} @c!67Z
public void setCountId(int countIds){ 4) 3pa*
this.countId=countIds; H ZLOn
} (d;(FBk='
public String getCountType(){ iy82QNe
return countType; 3=l-jGJk
} B%@!\D#
public int getCountId(){ ]2%P``Yj
return countId; +7/*y}.U
} `Y\/US70{c
} 9`v:$(I
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CountCache.java LQ@|M.$A
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/* _~nex,;r
* CountCache.java R{o*O_qX
* #@6L|$iX
* Created on 2007年1月1日, 下午5:01 c2\vG
* *Z`eNz}
* To change this template, choose Tools | Options and locate the template under C9H11g7{
* the Source Creation and Management node. Right-click the template and choose ]0i2]=J&,
* Open. You can then make changes to the template in the Source Editor. %B&?D@
*/ ~fp+@j-A
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package com.tot.count; ]XGn2U\
import java.util.*; 4D8y b|o
/** |~uzQU7
* 6&QTVdK'O
* @author U\8#Qvghf
*/ =P;;&j3Z
public class CountCache { Kc[u}
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public static LinkedList list=new LinkedList(); a61eH )a
/** Creates a new instance of CountCache */ >jz%bY
public CountCache() {} 6>BDA?
public static void add(CountBean cb){ h!N&gZ[0
if(cb!=null){ eAYW%a
list.add(cb); c^Gwri4
} HjK<)q8b
} O mh&)|Iql
} p@8^gc
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CountControl.java .-u k
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/* DET!br'z5
* CountThread.java h NOYFH
* R`C_CsXir
* Created on 2007年1月1日, 下午4:57 %c&Ah
* G2+)R^FSC
* To change this template, choose Tools | Options and locate the template under ;Jbc'V'fm
* the Source Creation and Management node. Right-click the template and choose YV3TxvXMR
* Open. You can then make changes to the template in the Source Editor. x$5nLS2.
*/
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package com.tot.count; SeZT4y*=
import tot.db.DBUtils; !:5`im;i
import java.sql.*; Xq^y<[
/** d[RWkk5
* Nzi/3r7m
* @author [%iUg\'7d
*/ rxgVT4
public class CountControl{ /Xu;/MMpd3
private static long lastExecuteTime=0;//上次更新时间 Xk&F4BJQk<
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Fy_<Ui
/** Creates a new instance of CountThread */ %hQMC'c
public CountControl() {} hKH$AEHEU}
public synchronized void executeUpdate(){ YKw!pu=
Connection conn=null; lq\'
PreparedStatement ps=null; W]!@Zlal
try{ fs3-rXoB
conn = DBUtils.getConnection(); H7tQ#
conn.setAutoCommit(false); {80oRD2=Q
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); S QM(8*:X
for(int i=0;i<CountCache.list.size();i++){ -l40)^ E}
CountBean cb=(CountBean)CountCache.list.getFirst(); RlslF9f
CountCache.list.removeFirst(); }KD7 Y
ps.setInt(1, cb.getCountId()); A"BtVy[[9
ps.executeUpdate();⑴ A1|7(Sow
//ps.addBatch();⑵ KT
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} ){Ciu[h
//int [] counts = ps.executeBatch();⑶ 0[2BY]`Z.
conn.commit(); i!.I;@
}catch(Exception e){ nqurY62Ip
e.printStackTrace(); \C+*loLs
} finally{ QWzOp\+
try{ gI^L
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if(ps!=null) { HeT6Dv
ps.clearParameters(); M}=s3[d(,
ps.close(); %0+h
ps=null; #Cg}!38
} '&.)T2Kw
}catch(SQLException e){} R8=I)I-8
DBUtils.closeConnection(conn); ?ae[dif
} v9t47>V
} ^)9MzD^_nV
public long getLast(){ "RV`L[(P*k
return lastExecuteTime; }&Wp3EWw
} |8DH4*y!
public void run(){ Z^'?|qFj!
long now = System.currentTimeMillis(); &J lpA<^s;
if ((now - lastExecuteTime) > executeSep) { e(OwS?K
//System.out.print("lastExecuteTime:"+lastExecuteTime); 7]/dg*A )C
//System.out.print(" now:"+now+"\n"); inr%XS/m
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); (C-,ljY
lastExecuteTime=now; DD12pL{QA
executeUpdate(); zz(!t eBC
} ;NiArcAS!
else{ W"b&M%y|
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); QMXD9H0{
} O8K@&V p
} wMH[QYb<*
} S s@u,`pr
//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 Xmap9x
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类写好了,下面是在JSP中如下调用。 3W7;f!
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<% F\-B3i%0
CountBean cb=new CountBean(); 8iMF 8\
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); bx hP jAL
CountCache.add(cb); B`?N,N"
out.print(CountCache.list.size()+"<br>"); ~w
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CountControl c=new CountControl(); ]dPVtk
c.run(); 0t#NMW
out.print(CountCache.list.size()+"<br>"); ^%\)Xi
%>