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: h+d3 JM
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CountBean.java &M2SqeR62;
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/* mIm.+U`a2
* CountData.java hkoCbR0}8
* 4.qW
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* Created on 2007年1月1日, 下午4:44 yVl?gGgh
* _|}
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* To change this template, choose Tools | Options and locate the template under J)"g`)\2 +
* the Source Creation and Management node. Right-click the template and choose _NkbB"+L
* Open. You can then make changes to the template in the Source Editor. VmTPE5d
*/ ?JI:>3e
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package com.tot.count; TF- k|##G
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/** 3PgiV%]
* zD%@3NA41
* @author HL34pmc
*/
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public class CountBean { $pGdGV\H
private String countType; '/v@q]!
int countId; @WfX{485
/** Creates a new instance of CountData */ 1GI/gc\
public CountBean() {} z[bS
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public void setCountType(String countTypes){ Qz9*o
this.countType=countTypes; /4lm=ZE/
} aEw wK(ny
public void setCountId(int countIds){ k CVA~%d7
this.countId=countIds; yx&'W_Q@
} jk-e/C
public String getCountType(){ ^*A8 NdaB
return countType; ncCgc5uP
} OjRJyhzS*
public int getCountId(){ Fg<rz&MR
return countId; UqEpeLK
} :qL1jnR^
} ;8J+Q0V
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CountCache.java E|> oseR
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/* VdetY\
* CountCache.java 0Z<&M|G
* y8|?J\eRy
* Created on 2007年1月1日, 下午5:01 $2lPUQZ<5
* Uf<hzP
* To change this template, choose Tools | Options and locate the template under LH]<+Zren
* the Source Creation and Management node. Right-click the template and choose iw)^;8q
* Open. You can then make changes to the template in the Source Editor. }vspjplk^
*/ S=.7$PY
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package com.tot.count; Re^~8q[
import java.util.*; f9FLtdh
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/** I|oS`iLl$
* l1MVC@'pvP
* @author l\%LT{$e
*/ SFQYrY
public class CountCache { ]F81N(@:F
public static LinkedList list=new LinkedList(); ~L7@,d :
/** Creates a new instance of CountCache */ E3==gYCe*
public CountCache() {} Gn7P` t*.
public static void add(CountBean cb){ mpysnKH
if(cb!=null){ =
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list.add(cb); xQK;3b
} 9/_ F
} 2qkZ B0[
} o2vBY]Tj
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CountControl.java #FQkwX'g
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/* S#wy+*
* CountThread.java /
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* M)v4>Rw+
* Created on 2007年1月1日, 下午4:57 ;LjTsF'
* eK=<a<tx
* To change this template, choose Tools | Options and locate the template under vl67Xtk4
* the Source Creation and Management node. Right-click the template and choose "-HmXw1+t
* Open. You can then make changes to the template in the Source Editor. (;.wsz&K
*/ cN(Toj'`
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package com.tot.count; p3R: 3E6p
import tot.db.DBUtils; nnol)|C{5Y
import java.sql.*; dqu+-43I|
/** eG05}
* isiehKkD
* @author q+}KAk|]V
*/ TC$)::C1
public class CountControl{ U1!#TD)@
private static long lastExecuteTime=0;//上次更新时间 |>U:Pb(
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -fILXu
/** Creates a new instance of CountThread */ swGp{wJ
public CountControl() {} ~?#B(t
public synchronized void executeUpdate(){ 2MQ
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Connection conn=null; bxrT[]
PreparedStatement ps=null; N(W;\>P
try{ ^}PG*h|
conn = DBUtils.getConnection(); ~Y.I;EPKt
conn.setAutoCommit(false); ccPTJ/%$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2@~hELkk/E
for(int i=0;i<CountCache.list.size();i++){ `\vqDWh8-
CountBean cb=(CountBean)CountCache.list.getFirst(); {Jx-Zo>'
CountCache.list.removeFirst(); vdt ":
ps.setInt(1, cb.getCountId()); Or9"T ]z
ps.executeUpdate();⑴ XVwJr""+
//ps.addBatch();⑵ ;p_@%*JAx
} m:
//int [] counts = ps.executeBatch();⑶ _hz}I>G@B
conn.commit(); m2|%AD
}catch(Exception e){ 6 J
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e.printStackTrace(); &uMx*TTY
} finally{ d)yu`U
try{ Vw>AD<Rl
if(ps!=null) { [S<1|hk
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ps.clearParameters(); bCbp JZ
ps.close(); [)wLji7MK
ps=null; jr`;H
} U-mZO7y!
}catch(SQLException e){} YooPHeQ
DBUtils.closeConnection(conn); Vhi4_~W3j]
} G9
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} A$=h'!$
public long getLast(){ vi1
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return lastExecuteTime; )oU%++cdo
} Wq}Y|0c
public void run(){ pcrarj
long now = System.currentTimeMillis(); n;+`%;6
if ((now - lastExecuteTime) > executeSep) { )d$FFTH
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5z~O3QX
//System.out.print(" now:"+now+"\n"); F).7%YfY
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); BGOajYD
lastExecuteTime=now; uGW!~qAr*
executeUpdate(); ;.'\8!j
} `:>N.9'o
else{ yRyUOTK
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); S8Ec.]T
} 9(AY7]6
} `Hp=1a
} p`I[3/$3
//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 m*f"Y"B.1I
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类写好了,下面是在JSP中如下调用。 o0}kRL
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<% V<&^zIJUR
CountBean cb=new CountBean(); KKcajN
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \MU-D,@
CountCache.add(cb); 9
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out.print(CountCache.list.size()+"<br>"); #M5pQ&yZy
CountControl c=new CountControl(); kIwq%c;
c.run(); epm ~
out.print(CountCache.list.size()+"<br>"); Mc@_[q!xY?
%>