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: =)Goip
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CountBean.java x^pHP|<3`
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/* (Fk&~/SP
* CountData.java V0F1X s`
* _.,"`U; H
* Created on 2007年1月1日, 下午4:44 ~%: TE}
* 4%TmW/yd
* To change this template, choose Tools | Options and locate the template under ^c sOXP=Yp
* the Source Creation and Management node. Right-click the template and choose 8Y;>3zth7
* Open. You can then make changes to the template in the Source Editor. ,/Y$%.Rp
*/ _9iF`Q
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package com.tot.count; +gb"}
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/** M3)Id?|]6
* Vt4,?"
* @author 2-"`%rE
*/ MPsm)jqX
public class CountBean { jSvo-
private String countType; "fd'~e$S#
int countId; 7{=+Va5
/** Creates a new instance of CountData */ !/e8x;_
public CountBean() {} r`:dUCFE
public void setCountType(String countTypes){ t@`Sa<
this.countType=countTypes; ;AarpUw'
} @=l.J+lh
public void setCountId(int countIds){ \3j4=K'nE
this.countId=countIds; l-[5Zl;"
} @#5?tk0
public String getCountType(){ (G{2ec:?
return countType; 3HX-lg`0
} hXn@vK6
public int getCountId(){ T@N)BfkB
return countId; qNbgN{4
} Ymg,NkiP0
} i$'#7U
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CountCache.java d1d:5b
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/* 8PW3x-+
* CountCache.java sH)40QmO{
* Xm.["&
* Created on 2007年1月1日, 下午5:01 I;?np
* mC`U"rlK~
* To change this template, choose Tools | Options and locate the template under _We4%
* the Source Creation and Management node. Right-click the template and choose 6J\A%i
* Open. You can then make changes to the template in the Source Editor. Dt+uf5o(
*/ &-`a`
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package com.tot.count; Pill |4 c<
import java.util.*; 6
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/** LGC3"z\=
* AjO|@6
* @author ot,e?lF
*/ Jb`yK@x
public class CountCache { At8^yF
public static LinkedList list=new LinkedList(); 6b=7{nLF
/** Creates a new instance of CountCache */ >zcp(M98
public CountCache() {} ,6^V)F
public static void add(CountBean cb){ e&XJK*Wf
if(cb!=null){ %0Ke4c
list.add(cb); T9Pu V
} ? `#
} WLN;LT
} TZS:(MJ9M
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CountControl.java ::G0v
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/* =:v5`
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* CountThread.java gS^Y?
* \>|:URnD
* Created on 2007年1月1日, 下午4:57 Ezw<
* Zk
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* To change this template, choose Tools | Options and locate the template under x?-kt.M
* the Source Creation and Management node. Right-click the template and choose .&c!k1kH
* Open. You can then make changes to the template in the Source Editor. DP7B X^e
*/ >W@3_{0
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package com.tot.count; 6SmawPPP
import tot.db.DBUtils; yDBMm^
import java.sql.*; &GLe4zEh
/** }q[IhjD%
* U10:@Wzh
* @author ao)8ie
*/ E@^mlUf
public class CountControl{ 4>I;^LHn
private static long lastExecuteTime=0;//上次更新时间 HpTX6}^
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 FPXB>D'
/** Creates a new instance of CountThread */ yM*<BV
public CountControl() {} $iAd)2LT
public synchronized void executeUpdate(){ _^u^@.Q'i<
Connection conn=null; I r;Z+}4>Y
PreparedStatement ps=null; _8nT$!\\
try{ +h?z7ZY^
conn = DBUtils.getConnection(); _f~m&="T!
conn.setAutoCommit(false); e.pq6D5
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); V(6ovJpA0
for(int i=0;i<CountCache.list.size();i++){ .2:S0=xt<
CountBean cb=(CountBean)CountCache.list.getFirst(); Z?tw#n[T
CountCache.list.removeFirst(); `?xE-S
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ps.setInt(1, cb.getCountId()); 5Gsjt+
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ps.executeUpdate();⑴ [+Y;w`;Fq
//ps.addBatch();⑵ SB2Ij',
} e`D? x1-
//int [] counts = ps.executeBatch();⑶ /2e,,)4g
conn.commit(); qx\P(dOUf
}catch(Exception e){ ;tu2}1#r
e.printStackTrace(); ?>o|H-R~5Z
} finally{ +c_8~C
try{ [}bPkD
if(ps!=null) { 7FD.3/
ps.clearParameters(); #sp8 !8|y
ps.close(); 07tSXl5!
ps=null; =5Auk5&
} H@hHEzO
}catch(SQLException e){} OLM}en_L
DBUtils.closeConnection(conn); 1brKs-z
} /N82h`\n
} 0I@Cx{$
public long getLast(){ ac??lHtH9
return lastExecuteTime; `SSUQ#@
} @&M$oI$4*
public void run(){ 0vm}[a4+i;
long now = System.currentTimeMillis(); JqYt^,,Q:
if ((now - lastExecuteTime) > executeSep) { n^Sc*7
//System.out.print("lastExecuteTime:"+lastExecuteTime); f'3sT(1&
//System.out.print(" now:"+now+"\n"); Kw^tvRt'*
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); f.y~ Sew
lastExecuteTime=now; O:3DIT1#>
executeUpdate(); i(@<KH
} bZsg7[: C
else{ z@n779 i
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !u=,b fyH
} =3?"s(9
} vswBK-w(Z
} jIs2R3B
//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 y?s8UEC
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类写好了,下面是在JSP中如下调用。 '+{dr\nJ
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<% PofHe
CountBean cb=new CountBean(); 'uOzC"_yF
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \4e6\6 +
CountCache.add(cb); nmrYB w>
out.print(CountCache.list.size()+"<br>"); %[C-KQH
CountControl c=new CountControl(); 3V`.<
c.run(); #XlE_XD
out.print(CountCache.list.size()+"<br>"); `2Oh0{x0*O
%>