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: {L/hhKT
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CountBean.java ]e6$ ={
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/* g1v=a
* CountData.java ^?5HagA
* PvB{@82
* Created on 2007年1月1日, 下午4:44 +;/ s0
* 8/T[dn
* To change this template, choose Tools | Options and locate the template under hg2UZ%
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* the Source Creation and Management node. Right-click the template and choose 10IX84
* Open. You can then make changes to the template in the Source Editor. !xvAy3
*/ +$$5Cv5#<&
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package com.tot.count; =A{s,UP
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/**
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* )~-r&Q5d
* @author O-&^;]ieJ
*/ %f 5c,}
public class CountBean { @Y !Jm
private String countType; xSrjN
int countId; 7:e5l19 uI
/** Creates a new instance of CountData */ Y_nl9}&+C0
public CountBean() {} GB4^ 4Ajx
public void setCountType(String countTypes){ B&m6N,
this.countType=countTypes; . ZP$,
} lk.Mc6)
public void setCountId(int countIds){ bT15jNa
this.countId=countIds; r;_*.|AH
} GBY{O2!3u
public String getCountType(){ w8cbhc
return countType; 089v;
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} #'dNSez5
public int getCountId(){ ]Z?jo#F
return countId; .z[#j]k
} S!66t?vHB
} EV@yJ]
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CountCache.java wOg#J
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/* vj9'5]!~q
* CountCache.java @,m 7%,
* EY^?@D_<
* Created on 2007年1月1日, 下午5:01 $8}'h
* %7[q%S
* To change this template, choose Tools | Options and locate the template under rvuasr~
* the Source Creation and Management node. Right-click the template and choose lvx[C7?
* Open. You can then make changes to the template in the Source Editor. HCT+.n6
*/ .d6b?t
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package com.tot.count; DE+k'8\T
import java.util.*; UCj{
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/** sQ.t3a3m
* m-bu{
* @author }W0_eQ
*/ &"(zK"O
public class CountCache { T:SqENV
public static LinkedList list=new LinkedList(); Z7> Nd$E{
/** Creates a new instance of CountCache */ g}d[j
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public CountCache() {} i.{.koH<
public static void add(CountBean cb){ Rn)fwGC
if(cb!=null){ p8FXlTk
list.add(cb); D$+g5u)
} 4~1lP&
} 6^lix9q7
} ~G1B}c]
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CountControl.java |K" nSXzk
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/* p-xG&CU
* CountThread.java +8Y|kC{9"
* ]=PkgOJD
* Created on 2007年1月1日, 下午4:57 GI@;76Qf
* q4v:s
* To change this template, choose Tools | Options and locate the template under 5O;D\M{>
* the Source Creation and Management node. Right-click the template and choose l#~pK6@W
* Open. You can then make changes to the template in the Source Editor. M%WO
*/ j2%fAs<
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package com.tot.count; WL?qulC}h1
import tot.db.DBUtils; sX-@
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import java.sql.*; c
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/** axOEL:-|Bu
* |h&Z.
* @author yb,X
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*/
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public class CountControl{ [=",R&uD$
private static long lastExecuteTime=0;//上次更新时间 `Tei
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 C80< L5\
/** Creates a new instance of CountThread */ b
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public CountControl() {} z;MPp#Y
public synchronized void executeUpdate(){ D8{,}@
Connection conn=null; U }AIOtUw
PreparedStatement ps=null; ?L0 |$#Iw
try{ X` J86G )
conn = DBUtils.getConnection(); P| hwLM
conn.setAutoCommit(false); *s<cgPKJ@
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); G1\F7A
for(int i=0;i<CountCache.list.size();i++){ FmhAUe
CountBean cb=(CountBean)CountCache.list.getFirst(); V(8,94vm
CountCache.list.removeFirst(); j^WYMr,
ps.setInt(1, cb.getCountId()); J~n|5*cz
ps.executeUpdate();⑴ W23Q>x&S
//ps.addBatch();⑵ Te`@{>
} e^,IZ{
//int [] counts = ps.executeBatch();⑶ 9s*QHCB0
conn.commit(); Q7-iy
}catch(Exception e){ B3pjli
e.printStackTrace(); yZN~A:
} finally{ o/Q|R+yXV
try{ "
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if(ps!=null) { :K 5?&kT
ps.clearParameters(); D)Ep!`Q
ps.close(); )U7fPKQ
ps=null; n/x((d%"E
} ^!x! F
}catch(SQLException e){} 8]oolA:^4s
DBUtils.closeConnection(conn); M6bM`wHH>
} '1(6@5tyWk
} mHV{9J
public long getLast(){ Ql%B=vgKL
return lastExecuteTime; UNK.39
} Nukyvse
public void run(){ ANJL8t-m
long now = System.currentTimeMillis(); tfu`_6
if ((now - lastExecuteTime) > executeSep) { !
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//System.out.print("lastExecuteTime:"+lastExecuteTime); b^&azUkMN
//System.out.print(" now:"+now+"\n"); bWSc&/9y
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9 )!}
lastExecuteTime=now; JU.!<
executeUpdate(); $7W5smW/
} [$pb
else{ jD%|@ux
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |>[qC O
} CyS%11L
} H%etYpD
} G0~Z|P
//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 99(@O,*(Y
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类写好了,下面是在JSP中如下调用。 ?@7!D8$9
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<% tTF<DD}8
CountBean cb=new CountBean(); <h;_:
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `<g6^ P
CountCache.add(cb); rS+) )!
out.print(CountCache.list.size()+"<br>"); FJ4,|x3v[x
CountControl c=new CountControl(); a+\<2NXYD
c.run(); 5ba e-
out.print(CountCache.list.size()+"<br>"); j S[#R_
%>