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: FU|brSt
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CountBean.java zVh yAf
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/* LS@TTiN
* CountData.java uf(ayDE
* hW7u#PY
* Created on 2007年1月1日, 下午4:44 pP\Cwo #,
* /iW+<@Mas
* To change this template, choose Tools | Options and locate the template under 2Gyq40
* the Source Creation and Management node. Right-click the template and choose x"r0<RK
* Open. You can then make changes to the template in the Source Editor. D(cD8fn,J
*/ j:9M${~
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package com.tot.count; !0
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/** 7T[~~V^x
* mY|c7}>V;
* @author cJKnB!iL5
*/ g`EZLDjt
public class CountBean { F)P:lvp<r
private String countType; D#jwI,n}x
int countId; +cpb!YEAb
/** Creates a new instance of CountData */ ZlV
public CountBean() {} Po>6I0y
public void setCountType(String countTypes){ 7KtU\u
this.countType=countTypes; [o^$WL?c
} ,@"yr>Q9#6
public void setCountId(int countIds){ 7:`XE&Z
this.countId=countIds; AvL /gt:
} X)g
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public String getCountType(){ #83
return countType; g&RpE41x
} WC_.j^sW
public int getCountId(){ ,@Csa#
return countId; t Cuvb
} 'r'=%u$1C
} m:_#kfC&K"
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CountCache.java Nr4Fp`b8
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/* (lsG4&\0F
* CountCache.java `&;#A*C0
* vuQA-w7
* Created on 2007年1月1日, 下午5:01 6v@Prw@.b
* <I,4Kc!
* To change this template, choose Tools | Options and locate the template under DpHubqWz
* the Source Creation and Management node. Right-click the template and choose vbJ<|#|r-
* Open. You can then make changes to the template in the Source Editor. {/[@uMS_6]
*/ &Vj@){
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package com.tot.count; ueg%yvO
import java.util.*; r$<!?Z
/** .+7n@Sc
* 3qV^RW&
* @author HoBx0N9\2
*/ F"Dr(V
public class CountCache { tmGhJZ2j
public static LinkedList list=new LinkedList(); 5%'ybh)@
/** Creates a new instance of CountCache */ WO>A55Xya
public CountCache() {} .]9`eGVWj
public static void add(CountBean cb){ `JIp$
if(cb!=null){ q\tr&@4iC
list.add(cb); ;&lXgC^*
} >A )Sl'
} "t2T*'j{
} 5a |[cR
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CountControl.java F%L"Q>aHW
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/* pIIp61=$
* CountThread.java y9}qB:[bR
* >$kFYb>~q
* Created on 2007年1月1日, 下午4:57 Iq|h1ie
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* X&Oo[Z
* To change this template, choose Tools | Options and locate the template under Tp ;W
* the Source Creation and Management node. Right-click the template and choose _9oKW;7f7
* Open. You can then make changes to the template in the Source Editor. y0O(n/
*/ ZW M:Wj192
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package com.tot.count; {9J|\Zz3
import tot.db.DBUtils; )t~ad]oM
import java.sql.*; CCpRQKb=
/** yXkQ
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* A._CCou
* @author D~inR3(}
*/ C,,T7(: k
public class CountControl{ '3XOU.
private static long lastExecuteTime=0;//上次更新时间 yS)k"XNb
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 A?tCa*b^
/** Creates a new instance of CountThread */ W}F~vx.
public CountControl() {} yI=nu53BV
public synchronized void executeUpdate(){ i K@RQi
Connection conn=null; 5hqXMs
PreparedStatement ps=null; vkLt#yj~
try{ )~P<ruk>,C
conn = DBUtils.getConnection(); EAY+#>L*
conn.setAutoCommit(false); 7<kr|-
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); va~:Ivl-)
for(int i=0;i<CountCache.list.size();i++){ \>T1&JT
CountBean cb=(CountBean)CountCache.list.getFirst(); 1`II%mf[
CountCache.list.removeFirst(); ~+6#4<M.~
ps.setInt(1, cb.getCountId()); d+Mogku2
ps.executeUpdate();⑴ MPp:EH
//ps.addBatch();⑵ W9Us I
} =PU@'OG
//int [] counts = ps.executeBatch();⑶ 5m;pHgkb
conn.commit(); Jbima>
}catch(Exception e){ ^=I[uX-3ue
e.printStackTrace(); tIA)LF
} finally{ vr>J$(F
try{ yokZ>+jb
if(ps!=null) { C#&b`
ps.clearParameters(); yl<=_Q
ps.close(); 4P2p|Gc3
ps=null; xZAg
} 5W{|?l{
}catch(SQLException e){} Kd#64NSi$A
DBUtils.closeConnection(conn); \ }-v
} JjAO9j%
} 9 Up>e
public long getLast(){ I
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return lastExecuteTime; RXPl~]k#i
} 4[0.M
public void run(){ X bV?=
long now = System.currentTimeMillis(); "Q23s"
if ((now - lastExecuteTime) > executeSep) { I#yd/d5^
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5o|u!#6
//System.out.print(" now:"+now+"\n"); v|kL7t)}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 5OFb9YX
lastExecuteTime=now; 'bef3P9`
executeUpdate(); BW)t2kR&
} <RkJ7Z^
else{ =2wy;@f
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Z*5]qh2r8
} v CR\lR+
} d#- <=6
} 3TD!3p8
//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
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类写好了,下面是在JSP中如下调用。 cW $~86u"C
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<% #KSB%
CountBean cb=new CountBean(); YwM;G
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); =>h~<88#5
CountCache.add(cb); u`X}AKC
out.print(CountCache.list.size()+"<br>"); HYk*;mD
CountControl c=new CountControl(); j#XU\G
c.run(); +hvVoBCM*
out.print(CountCache.list.size()+"<br>"); ].w$b)G
%>