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: o~P8=1t
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CountBean.java E\m?0]W|
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/* r\],5x'xSu
* CountData.java ~R)w
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* @{I55EQ]
* Created on 2007年1月1日, 下午4:44 Bo%M-Gmu
* BqZLqGOKu
* To change this template, choose Tools | Options and locate the template under 3=bzIU
* the Source Creation and Management node. Right-click the template and choose WS(@KN
* Open. You can then make changes to the template in the Source Editor. m OmT]X
*/ N0
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package com.tot.count; |w~zh6~
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/** ^D4 b\mF
* D4#,9?us
* @author &KR@2~vE
*/ 3pDZ}{ZZU
public class CountBean { [9(B;;R@
private String countType;
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int countId; Cc Ni8Wg_
/** Creates a new instance of CountData */ sef!hS06
public CountBean() {} 't)j
public void setCountType(String countTypes){ HwST^\Ao
this.countType=countTypes; g1zqh,
} D@
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public void setCountId(int countIds){ vMRKs#&8
this.countId=countIds; 2DV{gF
} >^InNJd
public String getCountType(){ u]dpA
return countType; y
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} 5,Q('t#J
public int getCountId(){ BMX x(W]
return countId; STOE=TC>
} Q ^ 39Wk@
} IwH
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CountCache.java GtGToI
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/* {Z?!*Ow
* CountCache.java z0Zl'
* , JZ@qmQ,
* Created on 2007年1月1日, 下午5:01 0]HK(,/h
* :sA-$*&x
* To change this template, choose Tools | Options and locate the template under Yhsb$wu
* the Source Creation and Management node. Right-click the template and choose }+=@Ci
* Open. You can then make changes to the template in the Source Editor. 5<a<!]|C
*/ &H+<uYV
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package com.tot.count; 7L<oWAq
import java.util.*; @~N#)L^
/** P2s0H+<
* IS=)J( 0
* @author *M`[YG19!e
*/ q?0goL
public class CountCache { aPb!-o{
public static LinkedList list=new LinkedList(); iTK1I0
/** Creates a new instance of CountCache */ QiRzA4-zq
public CountCache() {} 9QX{b+}"e
public static void add(CountBean cb){ D3HB`{
if(cb!=null){
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list.add(cb); jgMWjM6.
} EhVnt#`Si
} r}5GJ|p0
} 1Gqtd^*;
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CountControl.java /KV@Ce\
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/* d*AV(g#B
* CountThread.java :iWV:0)P
* hOC,Eo
* Created on 2007年1月1日, 下午4:57 vcSS+
* TX+t
* To change this template, choose Tools | Options and locate the template under #UI`G3w<
* the Source Creation and Management node. Right-click the template and choose }}xR?+4A
* Open. You can then make changes to the template in the Source Editor. -OW$
*/ ~,guw7F
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package com.tot.count; 9q5[W=|
import tot.db.DBUtils; T(}da**X
import java.sql.*; kN) pi "
/** *lTu-
* JC+VG;kcs
* @author w'eenIX^^
*/ QMsnfG
public class CountControl{ EPg?jKZava
private static long lastExecuteTime=0;//上次更新时间 e,4G:V'NX
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 F3f>pK5
/** Creates a new instance of CountThread */ Bh.'%[',
public CountControl() {} 'qD9kJ`
public synchronized void executeUpdate(){ He@= bLLa
Connection conn=null; ZEMo`O
PreparedStatement ps=null; ?@,:\ ,G
try{ z&:[.B
conn = DBUtils.getConnection(); u,]yd*
conn.setAutoCommit(false); df)1}/*L
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); gbh:Y}_FU
for(int i=0;i<CountCache.list.size();i++){ EtcamI*`
CountBean cb=(CountBean)CountCache.list.getFirst(); Xg)yz~Ug
CountCache.list.removeFirst(); }B.C#Y$@
ps.setInt(1, cb.getCountId()); +Q9HsfX/
ps.executeUpdate();⑴
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//ps.addBatch();⑵ 0jS/U|0
} JU6np 4
//int [] counts = ps.executeBatch();⑶ Z`!pU"O9l
conn.commit(); INT2i8oU
}catch(Exception e){ zJy{Ry[Sb
e.printStackTrace(); %)e+w+
} finally{ *~"`&rM(
try{ &ar}6eO
if(ps!=null) { .`p_vS9
ps.clearParameters(); oF^B J8%Lm
ps.close(); g:)vthOs
ps=null; Ij8tBT?jlL
}
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}catch(SQLException e){} O^:h _L
DBUtils.closeConnection(conn); 2=|IOkY
} GwV FD%
} @W,Y_8:
public long getLast(){ IY:O? M
return lastExecuteTime; ;0*^9 8K
} !RD,:\5V
public void run(){ Y^G3<.B
long now = System.currentTimeMillis(); IO'Q}bU4vs
if ((now - lastExecuteTime) > executeSep) { ^`7t@G$ D
//System.out.print("lastExecuteTime:"+lastExecuteTime); t<7WM'2<y
//System.out.print(" now:"+now+"\n"); Rt|Hma
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); n\YxRs7
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lastExecuteTime=now; `3KprpE8v
executeUpdate(); L_r &'B
} CvJm7c
else{ N'1~ wxd
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :&%;s*-9
} #Q"vwek
} Gpu?z-)
} g2]-Q.
//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 O /&%`&2
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类写好了,下面是在JSP中如下调用。 Uu+C<j&-
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<% |gz,Ip{
CountBean cb=new CountBean(); SDwSlwf
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); bij?q\
CountCache.add(cb); s*f.` A*)
out.print(CountCache.list.size()+"<br>"); 12a #]E
CountControl c=new CountControl(); (`u!/
c.run(); B`aAvD`7
out.print(CountCache.list.size()+"<br>"); }}_uN-m
%>