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: mX, @yCI
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CountBean.java ~f( #S*Ic
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/* =h|7bYLy
* CountData.java g|h;*
* Z_7TD)
* Created on 2007年1月1日, 下午4:44 Fq`@sM$
* %NfH`%`
* To change this template, choose Tools | Options and locate the template under 02)Ybp6y
* the Source Creation and Management node. Right-click the template and choose +UX}
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* Open. You can then make changes to the template in the Source Editor. 2sVDv@2
*/ ?}S!8;d
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package com.tot.count; wUfPnAD.'
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/** NRk^Z)
* O;T)u4Q&3
* @author RWoVN$i>
*/ R/ x-$VJ
public class CountBean { /Xv@g$
private String countType; y)TBg8Q
int countId; L`fT;2
/** Creates a new instance of CountData */ }WF6w+
public CountBean() {} _d+` Gw
public void setCountType(String countTypes){ 9>ZX@1]m_
this.countType=countTypes; t}MT<Jj
} CK_\K,xVT
public void setCountId(int countIds){ wRq
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this.countId=countIds; :c`djM^ll
} !!mGsgnW
public String getCountType(){ F5M{`:/
return countType; yVJ)JhV
} /Ao.b|mm
public int getCountId(){ ey\(*Tu9
return countId; ?,C'\8'
} O* )BJOPa
} Zm(}~C29
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CountCache.java Ye^xV,U@
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/* 6;Mv)|FJF
* CountCache.java 3E>]6
* IxY!.d_s|~
* Created on 2007年1月1日, 下午5:01 7t78=wpLc
* |HPb$#i
* To change this template, choose Tools | Options and locate the template under mXMU
* the Source Creation and Management node. Right-click the template and choose Nov
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* Open. You can then make changes to the template in the Source Editor. V;P*/ke
*/ c:s[vghH^#
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package com.tot.count; &yqk96z
import java.util.*; z ^y -A?
/** GkKoc v
* O<XNI(@
* @author 6+C]rEY/o
*/ db3.X~Cn#s
public class CountCache { ): r'IR
public static LinkedList list=new LinkedList(); -Byl~n3*D
/** Creates a new instance of CountCache */ 7]hRAhJ8I
public CountCache() {} zP/SDW
public static void add(CountBean cb){ s8k4e6ak
if(cb!=null){ XHY,;4
list.add(cb); 6c}nP[6|
} SL<EZn0F9
} `[x'EJp#
} B<~BX[
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CountControl.java 6']WOM#
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/* )Rj?\ZUR
* CountThread.java cO-^#di
* (D\`:1g
* Created on 2007年1月1日, 下午4:57 uiWo<}t}{
* *O-m:M!eA
* To change this template, choose Tools | Options and locate the template under nrM-\'
* the Source Creation and Management node. Right-click the template and choose 'ztY>KV j
* Open. You can then make changes to the template in the Source Editor. yPH5/5;,
*/ `|:` yl
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package com.tot.count; ={{q_G\WD
import tot.db.DBUtils; e C&!yY2g
import java.sql.*; K=dG-+B~}
/** &*~_ "WyU
* ^n\g,
* @author T3-/+4$0v
*/ 1NK,:m
public class CountControl{ mH'om
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private static long lastExecuteTime=0;//上次更新时间 (]5gYi
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 WTZuf9:
/** Creates a new instance of CountThread */ |s!n7%|,7
public CountControl() {} }IKU^0M9<T
public synchronized void executeUpdate(){ I3Ad+]v
Connection conn=null; p
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PreparedStatement ps=null; \r&(l1R
try{ 'tVe#oI
conn = DBUtils.getConnection(); Wa%p+(\<uB
conn.setAutoCommit(false); X C'|
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); GEki34
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for(int i=0;i<CountCache.list.size();i++){ i\RB KF
CountBean cb=(CountBean)CountCache.list.getFirst(); Pa ^_s
CountCache.list.removeFirst(); Gk|T1%
ps.setInt(1, cb.getCountId()); 0EC/l
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ps.executeUpdate();⑴ Vj[,o
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//ps.addBatch();⑵ rwAycW7
} lK#uyag
//int [] counts = ps.executeBatch();⑶ T lB+
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conn.commit(); U^OR\=G^
}catch(Exception e){ )N&95\u
e.printStackTrace(); -V||1@
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} finally{ s6I/%R3
try{ <"LA70Hkk
if(ps!=null) { B>
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ps.clearParameters(); M|7{ZE`Y
ps.close(); OL623jQX
ps=null; nB%[\LtZ?
} ~B`H5#
}catch(SQLException e){} \Pd>$Q
DBUtils.closeConnection(conn); VQpwHzh
} fc%C!^7
} CbT ;#0
public long getLast(){ qnw8#!%I
return lastExecuteTime; 8ZDWaq8^2N
} !:1BuiL
public void run(){ |PLWF[+t8
long now = System.currentTimeMillis(); "T6s;'k
if ((now - lastExecuteTime) > executeSep) { #LG<o3An
//System.out.print("lastExecuteTime:"+lastExecuteTime); cUU"*bA#
//System.out.print(" now:"+now+"\n"); `(@{t:L
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); b yJ[1UK
lastExecuteTime=now; zHvW@A'F
executeUpdate(); ~gOdK-SV*
} ;-kg3fGB1Q
else{ @G=_nZxv
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); BNbz{tbX"
} oh >0}Gc8
} )'`@rq!
} #vT~D>zj
//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 \0^Je>-:U
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类写好了,下面是在JSP中如下调用。 <GoZ>
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<% [3(lk_t
CountBean cb=new CountBean(); C0'_bTfB
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); @Y+9")?
CountCache.add(cb); =OooTZb:x-
out.print(CountCache.list.size()+"<br>"); Br"K{g?
CountControl c=new CountControl();
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c.run(); J|dj`Z?
out.print(CountCache.list.size()+"<br>"); 2Xp?O+b#"O
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