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: A-vK0l+
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CountBean.java mh>)N"
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/* 2HBYReQ
* CountData.java UBp0;)-
* Bry\"V"'g
* Created on 2007年1月1日, 下午4:44 %N@454enH
* 8V%(SV
* To change this template, choose Tools | Options and locate the template under K
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* the Source Creation and Management node. Right-click the template and choose X#<#7.
* Open. You can then make changes to the template in the Source Editor. Y!9'Wf/^
*/ g4<w6eB
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package com.tot.count; ba^cw}5
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/** [1@-F+
* `#hdb=3
* @author NrVrR80Y
*/ |HXI4MU"
public class CountBean { X62h7?'Pd
private String countType; 'u$e2^
int countId; s4bLL
/** Creates a new instance of CountData */ [)|P-x-<
public CountBean() {} |a#4
public void setCountType(String countTypes){ QT /TZ:
this.countType=countTypes; p`-`(i=iJo
} }zi:nSpON
public void setCountId(int countIds){ EoqUFa,
this.countId=countIds; =h^cfyj
} JK.lL]<p i
public String getCountType(){ Q*mzfsgr
return countType; q
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} wE:hl
public int getCountId(){ ig^9lM'
return countId; y\b.0-z
} QIVpO /@
} MK7S*N1
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CountCache.java ,9gyHQ~
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/* {~ ZSqd
* CountCache.java ,JyE7h2%i
* 1 ry:Z2
* Created on 2007年1月1日, 下午5:01 %B`MO-
* &GcWv+p
* To change this template, choose Tools | Options and locate the template under TjGe8L:
* the Source Creation and Management node. Right-click the template and choose LX[J6YKR
* Open. You can then make changes to the template in the Source Editor. iy Zs:4jkc
*/ PhF3' ">
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package com.tot.count; &yv%"BPV
import java.util.*; - XIjol(
/** @yPa9Ug(V
* K~OfC
* @author 0PD]#.+
*/ R| t"(6
public class CountCache { |U%S<X
public static LinkedList list=new LinkedList(); O/$pT%D1x
/** Creates a new instance of CountCache */ .|$6Pi%!
public CountCache() {} oX@nWQBc_
public static void add(CountBean cb){ h|"98PI
if(cb!=null){ cAIMt]_
list.add(cb); ZurQr}
} gbM#jhQ
} }Og zSnR
} IF%^HK@
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CountControl.java *;. l/
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/* Gd1%6}<~
* CountThread.java g
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* #~%tdmGuL
* Created on 2007年1月1日, 下午4:57 4(Gs$QkSo|
* bvzeUn
* To change this template, choose Tools | Options and locate the template under x; 89lHy@e
* the Source Creation and Management node. Right-click the template and choose o&)O&bNJ
* Open. You can then make changes to the template in the Source Editor. W+V#z8K
*/ Es6b~#
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package com.tot.count; fw,ruROqD
import tot.db.DBUtils; M@fUZh
import java.sql.*; Fy5xIRyI\F
/** ?I&ha-."
* KB!.N[!v
* @author o1='Fr
*/ l;zp f|.Vc
public class CountControl{ u{xjFx-
private static long lastExecuteTime=0;//上次更新时间 #z 3tSnmp
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 >K**SjVG
/** Creates a new instance of CountThread */ iX qB-4"
public CountControl() {} fRC(Yyx
public synchronized void executeUpdate(){ H[?~u+
Connection conn=null; ja*k\w{U'
PreparedStatement ps=null; _;",7bT80
try{ `W< 7.
conn = DBUtils.getConnection(); G^]T
conn.setAutoCommit(false); ork/:y9*y
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); G=a.Wff
for(int i=0;i<CountCache.list.size();i++){ AYHB?xOpR
CountBean cb=(CountBean)CountCache.list.getFirst(); FCTz>N^p
CountCache.list.removeFirst(); ^:W.R7|
ps.setInt(1, cb.getCountId()); !/, 6+2Ru
ps.executeUpdate();⑴ +c#:;&Gs
//ps.addBatch();⑵ eYBo*
} rXXIpQRi$S
//int [] counts = ps.executeBatch();⑶ [,)yc/{*
conn.commit(); ^l;nBD#nJ
}catch(Exception e){ S]iMZ \I/
e.printStackTrace(); \^2%v~
} finally{ YJ_`[LnL
try{ DG}YQr.L
if(ps!=null) { 4$J:A~2H]
ps.clearParameters(); ~(kIr?^
ps.close(); FLdO
ps=null; {ve86 POY
} L8n1p5gx3
}catch(SQLException e){} FDM&rQ
DBUtils.closeConnection(conn); ZeD;
} 4mSL*1j
} 9.ZhkvR4A
public long getLast(){ HubSmbS1
return lastExecuteTime; Z\6&5r=
} -=,%9r
public void run(){ [?$ZB),L8
long now = System.currentTimeMillis(); QIQ }ia
if ((now - lastExecuteTime) > executeSep) { iaBy/!i
//System.out.print("lastExecuteTime:"+lastExecuteTime); -]"=b\Q
//System.out.print(" now:"+now+"\n"); aZ^P*|_K3
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); K}ACZT)Wp
lastExecuteTime=now; 5&q@;vR
executeUpdate(); {bnNY
} bG=CIa&@
else{ 4} uX[~e&
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); #=/eu=
} WLGx=
;
} V_jVVy30Ji
} MVHj?
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 &RP!9{F<
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类写好了,下面是在JSP中如下调用。 LcCb[r
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<% 9'F-D
CountBean cb=new CountBean(); 6dQa|ACX_
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Icf 4OAx
CountCache.add(cb); #+Z3!VS
out.print(CountCache.list.size()+"<br>"); 2xRb$QF
CountControl c=new CountControl(); uV.3g 1m
c.run(); ?PORPv#
out.print(CountCache.list.size()+"<br>"); eA9U|&o
%>