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: lt(-,md
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CountBean.java uL2{v
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/* qu~"C,
* CountData.java LXEu^F~{u#
* p$!+2=)gY
* Created on 2007年1月1日, 下午4:44 s"Pk-Dv
* i\R\bv[9
* To change this template, choose Tools | Options and locate the template under Ai_|)
* the Source Creation and Management node. Right-click the template and choose q!h*3mNm
* Open. You can then make changes to the template in the Source Editor. )b2E/G@X&
*/ yW=hnV{
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package com.tot.count; 9oau_Q#
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/** ujHzG}2z
* ]B.,7
* @author .gsu_N_v
*/ KL\=:iWA
public class CountBean { $=g.-F%*=
private String countType; n YMf[kW
int countId; Cq;K,B9
/** Creates a new instance of CountData */ <IkD=X
public CountBean() {} rpP+20 v
public void setCountType(String countTypes){ YHv,Z|.w
this.countType=countTypes; 0~L8yMM
} U!UX"r
public void setCountId(int countIds){ qxCL
this.countId=countIds; w#bbm'j7r
} .1q~,}toX
public String getCountType(){ 3/|{>7]1
return countType; DBrzw+;e3
} &l}xBQAL
public int getCountId(){ S$_Ts1Ge6
return countId; -clg'Aa;.
} N*)8L[7_;
} \]:NOmI^'
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CountCache.java p){RSq
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/* ?j$8Uy$$
* CountCache.java ump:dL5{
* ?;7>`F6ld
* Created on 2007年1月1日, 下午5:01 M
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* ~9jP++&
* To change this template, choose Tools | Options and locate the template under &IPK5o,
* the Source Creation and Management node. Right-click the template and choose $A0]v!P~i-
* Open. You can then make changes to the template in the Source Editor. EjCzou
*/ -+2xdLa63
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package com.tot.count; JRs[%w`kD
import java.util.*; uC ;PP=z
/** q@yabuN@,j
* _I"<?sh3
* @author <y/AEY1
*/ T1W9@9,s
public class CountCache { vh.tk^&
public static LinkedList list=new LinkedList(); "YU~QOGx@
/** Creates a new instance of CountCache */ ^9~%=k=
public CountCache() {} @9P9U`ZP
public static void add(CountBean cb){ )s[S.`STz
if(cb!=null){ H4",r5qw:
list.add(cb); 6#63D>OWp
} 4U1fPyt
} 4!W?z2ly~R
} t-m,~Io W
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CountControl.java }(IDPaJ
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/* oa|*-nw
* CountThread.java weadY,-H8
* _@?Jx/`;bk
* Created on 2007年1月1日, 下午4:57 03\8e?$
* 5Kxk9{\8
* To change this template, choose Tools | Options and locate the template under KvOI)"0(
* the Source Creation and Management node. Right-click the template and choose f;dU72]q+
* Open. You can then make changes to the template in the Source Editor. H LGy"P
*/ >V=@[B(0
*J5euA5=
package com.tot.count; "r3s'\
import tot.db.DBUtils; 7n]%`Yb
import java.sql.*; nM}`H'0
/** $6%;mep
* 9rc
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* @author ^moIMFl
*/ Gl:T
public class CountControl{ _jKVA6_E
private static long lastExecuteTime=0;//上次更新时间 rZ4<*Zegv
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 T1[ZrY'0
/** Creates a new instance of CountThread */ "<R
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public CountControl() {} |VF"Cjw?
public synchronized void executeUpdate(){ X,CFY
Connection conn=null; LMj'?SuH
PreparedStatement ps=null; nECf2>Yp v
try{ N2Hb19/k
conn = DBUtils.getConnection(); \`# 0,pLr
conn.setAutoCommit(false); HBGA
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Upen/1 bA
for(int i=0;i<CountCache.list.size();i++){ m3e49 bP
CountBean cb=(CountBean)CountCache.list.getFirst(); LZ: \V)5+
CountCache.list.removeFirst(); ZO$T/GE6%
ps.setInt(1, cb.getCountId()); 5ml}TSMu'
ps.executeUpdate();⑴ n:] 1^wX#
//ps.addBatch();⑵ =x]dP.
} rs+37
//int [] counts = ps.executeBatch();⑶ 1D DOUV
conn.commit(); 8Y'"=!3
}catch(Exception e){ cYS+XBz
e.printStackTrace(); eR;0pWVl
} finally{ ?MB nnyo6
try{ [p<[83' ]
if(ps!=null) { ~]+
jn
ps.clearParameters(); e:occT
ps.close(); &cE,9o%FZ
ps=null; a}hM}U!
} @b({QM|
}catch(SQLException e){} Q(7l<z
DBUtils.closeConnection(conn); _3>zi.J/
} zjE4v-H:l
} cNvcpv
public long getLast(){ ( "z;Q?(
return lastExecuteTime; S3wH
M
} 9h pM*wt
public void run(){ 6%1o<{(%f
long now = System.currentTimeMillis(); RjHpC7b*%
if ((now - lastExecuteTime) > executeSep) { Jx?>1q=M
//System.out.print("lastExecuteTime:"+lastExecuteTime); - mXr6R?
//System.out.print(" now:"+now+"\n"); {mGWMv
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); n/D]r
lastExecuteTime=now; 4tTJE<y
executeUpdate(); z|H>jit+
} NQ=YTRU
else{ Dw,f~D$+ic
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); kJFHUR
} E+ 20->
} rNp#5[e
} Gjr2]t;E
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 yK3z3"1M?
EV$n>.
类写好了,下面是在JSP中如下调用。 "KwKO8f
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<% A>yIH)b
CountBean cb=new CountBean(); T667&@
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); L\DaZ(Y
CountCache.add(cb); 1A`";E&
out.print(CountCache.list.size()+"<br>"); d5hE!=
CountControl c=new CountControl(); s ~G{-)*
c.run(); OK(d&
out.print(CountCache.list.size()+"<br>"); 4y.[tk5
%>