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: ,Q/Ac{C
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CountBean.java }CDk9Xk
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/* DNkWOY#{
* CountData.java l&$$w!n0w
* vyI%3+N@
* Created on 2007年1月1日, 下午4:44 %UZVb V
* `zpbnxOL$T
* To change this template, choose Tools | Options and locate the template under uj|BQ`k
* the Source Creation and Management node. Right-click the template and choose k~3.MU
* Open. You can then make changes to the template in the Source Editor. ~D[?$`x:
*/ k(%QIJH
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package com.tot.count; ;AJTytE>%
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/** `^9(Ot $
* awewYf$li
* @author x3pND
*/ =gh`JN6
public class CountBean { wnLi2k/Dt<
private String countType; lb*8G
int countId; "
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/** Creates a new instance of CountData */ jZoNi
public CountBean() {} $2~\eG=u H
public void setCountType(String countTypes){ l8h&|RY[
this.countType=countTypes; ~z5R{;Nbz|
} AJ^#eY5
public void setCountId(int countIds){ j2l55@
this.countId=countIds; A"5z6A4WB
} _c$9eAe
public String getCountType(){ `qVjwJ!+
return countType; E\nv~Y?SG
} l`-bFmpA
public int getCountId(){ Z?Hs@j
return countId; CSPKP#,B0[
} R9rj/Co
} -u!FOD/
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CountCache.java YwY74w:
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/* 7R#+Le)
* CountCache.java 0[?ny`Y
* qn1255fB
* Created on 2007年1月1日, 下午5:01 Cv
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* ~ 9)"!
* To change this template, choose Tools | Options and locate the template under [%Bf<
J<
* the Source Creation and Management node. Right-click the template and choose v[plT2"s
* Open. You can then make changes to the template in the Source Editor. r0d35
*/ ofYlR|
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package com.tot.count; jcNT<}k
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import java.util.*; uXDq~`S
/** 'Jf^`ZT}
* yme^b
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* @author =[\s8XH,
*/ mC?i}+4>4R
public class CountCache { o&AM2U/?
public static LinkedList list=new LinkedList(); 1&;QyTN
/** Creates a new instance of CountCache */ kg@>;(V&
public CountCache() {} pj4!:{.;
public static void add(CountBean cb){ g;$Xq)Dd
if(cb!=null){ Le<wR
list.add(cb); ^Q*atU
} SS`qJZ|w
} 322jR4QGr
} pfu1O6R
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CountControl.java "S3wk=?4
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/* p.+ho~sC,.
* CountThread.java mUS_(0q
* b'6-dU%
* Created on 2007年1月1日, 下午4:57 nhIa175'
* Y"-^%@|p
* To change this template, choose Tools | Options and locate the template under 8
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* the Source Creation and Management node. Right-click the template and choose =K{\p`?
* Open. You can then make changes to the template in the Source Editor. +)2s-A f-
*/ N3u((y/
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package com.tot.count; atXS-bg*
import tot.db.DBUtils; dnV[ P
import java.sql.*; u,}{I}x_
/** dCj,b$
* uV 7BK+[O
* @author CHV*vU<N
*/ D#&q&6P{
public class CountControl{ vN3Zr34
private static long lastExecuteTime=0;//上次更新时间 N^B o
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [s&$l G!
/** Creates a new instance of CountThread */ Sm~l:v0%
public CountControl() {} +3KEzo1=)
public synchronized void executeUpdate(){ |&Ym@Jyj
Connection conn=null; UI>Y0O
PreparedStatement ps=null; 6oF7:lt
try{ oh$Q6G
conn = DBUtils.getConnection(); H,N)4;F<c
conn.setAutoCommit(false); l x,"EOP
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); qhT@;W/X
for(int i=0;i<CountCache.list.size();i++){ 1KjU ]
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CountBean cb=(CountBean)CountCache.list.getFirst(); |j 6OM{@
CountCache.list.removeFirst(); -!c"k}N=
ps.setInt(1, cb.getCountId()); >Wz;ySEz
ps.executeUpdate();⑴ J/}:x;Y
//ps.addBatch();⑵ ;]_o4e6\p
} ^5=B`aich
//int [] counts = ps.executeBatch();⑶ `[C!L *#,
conn.commit(); 8P=o4lO+
}catch(Exception e){ {'U
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e.printStackTrace(); `X3^fg
} finally{ q7"7U=W0
try{ }!6\|;Qsz,
if(ps!=null) { Uh][@35 p
ps.clearParameters(); ATR!7i\|
ps.close(); jAud {m*T
ps=null; PG,_^QGCX
} 9Lr'YRl[W
}catch(SQLException e){} H/Llj.-jg
DBUtils.closeConnection(conn); E8-P"`Qba
} YX`7Hm,
} '3?\K3S4i
public long getLast(){ gCxAG
return lastExecuteTime; hcyM6:}
} D:Zy
public void run(){ Uf, 4
long now = System.currentTimeMillis(); ]8T!qS(UJd
if ((now - lastExecuteTime) > executeSep) { {c
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//System.out.print("lastExecuteTime:"+lastExecuteTime); d'Zqaaf k%
//System.out.print(" now:"+now+"\n"); 9-rNw?7
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); f aLtdQi
lastExecuteTime=now; Y*!qG
executeUpdate(); #
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} kV38`s>+
else{ KG=h&
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); }X=[WCKU
} LGl2$#x
} 0lv%`,
} ,dx3zBI
//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 DoeiW=
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类写好了,下面是在JSP中如下调用。 ,13Lq-
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<% kSDZZx
CountBean cb=new CountBean(); PnoPbk[<
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); T,VY.ep/
CountCache.add(cb); SGe^ogO"v
out.print(CountCache.list.size()+"<br>"); Dre]AsgiV
CountControl c=new CountControl(); %%4t~XC#
c.run(); TsGE cxIg
out.print(CountCache.list.size()+"<br>"); ma((2My'H
%>