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: 9sId2py]W
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CountBean.java rGt/ /6
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/* 71I: P|.>
* CountData.java ;
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* 4UISuYg'
* Created on 2007年1月1日, 下午4:44 d95 $w8>
* Z'cL"n\9R]
* To change this template, choose Tools | Options and locate the template under K1oSoD8c
* the Source Creation and Management node. Right-click the template and choose u]$e@Vw.
* Open. You can then make changes to the template in the Source Editor.
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*/ bMvHAtp
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package com.tot.count; $:u5XJx
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/** D\LXjEme.
* mh :eUFe
* @author ^!j,d_)b!
*/ huTWoMU
public class CountBean { n ]<>$
private String countType; ibqJ'@{=e
int countId; 1$toowb"Zy
/** Creates a new instance of CountData */ $%"?0S
public CountBean() {} 2t3DQ
public void setCountType(String countTypes){ ( kFg2kG
this.countType=countTypes; VQ(l=k:}2
} p
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public void setCountId(int countIds){ U^~jB= =]
this.countId=countIds; 0<$t9:dq
} nf,u'}psdJ
public String getCountType(){ #k/NS
return countType; [:"7B&&A
} S uo
public int getCountId(){ 7@u:F?c
return countId; 8Ben}j)H
} 7|Bg--G1
} "b
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CountCache.java 0w9[Z
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/* M\L^ Wf9
* CountCache.java c-".VF
* V")u
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* Created on 2007年1月1日, 下午5:01 +m]Kj3-z@
* gu|cQ2xV
* To change this template, choose Tools | Options and locate the template under fZNWJo# `.
* the Source Creation and Management node. Right-click the template and choose %VsIg
* Open. You can then make changes to the template in the Source Editor. NA-)7i*>J
*/ ^E}};CsT
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package com.tot.count; rzO5 3\
import java.util.*; 6JUjT]S%
/**
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* s+7#Tdh A
* @author u~7
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*/ ~Kll.
public class CountCache { l0@+&Xj
public static LinkedList list=new LinkedList(); d>k"#|
/** Creates a new instance of CountCache */ mWiX@#,
public CountCache() {} *L+)R*|:&
public static void add(CountBean cb){ $PbwC6>8
if(cb!=null){ KOYcT'J@vR
list.add(cb); Nt/#Qu2#br
} kW.it5Z#
} ;'7gg]
} WJs2d73Qp
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CountControl.java ])D39
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/* [~UCYYl
* CountThread.java |4?O4QN
* m0[JiwPI
* Created on 2007年1月1日, 下午4:57 )zYm]\@
* G~FAChI8![
* To change this template, choose Tools | Options and locate the template under sUTfY|<7|
* the Source Creation and Management node. Right-click the template and choose *-lw2M9V
* Open. You can then make changes to the template in the Source Editor. Lju)q6
*/ x17K8De
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package com.tot.count; @/ G$
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import tot.db.DBUtils; )4CF*>*6V
import java.sql.*;
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/** s!eB8lkcT
* 9%6W_0>
* @author \`N<0COP
*/ c@<vFoq
public class CountControl{ _7P#?:h
private static long lastExecuteTime=0;//上次更新时间 rFl6xM;F
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 n[tES6u
/** Creates a new instance of CountThread */ ZT1IN6;8W
public CountControl() {} ,I^:xw_
public synchronized void executeUpdate(){ DB>.Uf"
Connection conn=null; uX8yS|= *
PreparedStatement ps=null; qdY*y&}"J
try{ Udl8?EVSz
conn = DBUtils.getConnection(); >xK!J?!K
conn.setAutoCommit(false); V0)F/qY
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Hy|
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for(int i=0;i<CountCache.list.size();i++){ V^/]h
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CountBean cb=(CountBean)CountCache.list.getFirst(); p*OpO&oodu
CountCache.list.removeFirst(); 2/4,iu(T`c
ps.setInt(1, cb.getCountId()); { 2\.
ps.executeUpdate();⑴ HHXm
4}!;<
//ps.addBatch();⑵ MzX4/*ba
} lN,)T%[0-
//int [] counts = ps.executeBatch();⑶ jp|1S^b
conn.commit(); +u|p<z
}catch(Exception e){ b@?pofZ`k
e.printStackTrace(); vzPuk|q3
} finally{ c2fqueK|:W
try{ eA'1
if(ps!=null) { ,,o5hD0V9
ps.clearParameters(); MbJ|6g99
ps.close(); Jh!'"7
ps=null; pon0!\ZT=
} o|O|e9m(
}catch(SQLException e){} )"4v0dv
DBUtils.closeConnection(conn); 29~Bu5
} .^aqzA=]
} u{d\3-]/
public long getLast(){ W &HF*Aw
return lastExecuteTime; jGaI6G'N
} qG?svt
public void run(){ W1;u%>Uh
long now = System.currentTimeMillis(); c
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if ((now - lastExecuteTime) > executeSep) { KE*8Y4#9
//System.out.print("lastExecuteTime:"+lastExecuteTime); 7,:$, bL
//System.out.print(" now:"+now+"\n"); pxgVYr.
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); j$mCU?
lastExecuteTime=now; lOJ3_8
executeUpdate(); l
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} h.WvPZ2U
else{ @24)*d^1
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); uE%$<o*#
} n,vs(ZL:
} ?X5Y8n]y\h
} DSX.84
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 6l,oL'$}P1
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类写好了,下面是在JSP中如下调用。 )ZqY`by!
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<% 8{ooLdpX7
CountBean cb=new CountBean(); UD}#c:I
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); gSn9L)k(O
CountCache.add(cb); #BLmT-cl
out.print(CountCache.list.size()+"<br>"); 75?z" i
CountControl c=new CountControl(); H\!p%Y
c.run(); m. EIMuj
out.print(CountCache.list.size()+"<br>"); dw"{inMf
%>