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: YS4"TOFw
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CountBean.java aQH]hLvs
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/* ZYY`f/qi
* CountData.java 37n2 #E
* AW;xlY= g
* Created on 2007年1月1日, 下午4:44 Sc3{Y+g
* p v4#`.m
* To change this template, choose Tools | Options and locate the template under 7E*0;sA#
* the Source Creation and Management node. Right-click the template and choose "z6p=B"?3
* Open. You can then make changes to the template in the Source Editor. E*R-Dno_F
*/ /0`Eux\
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package com.tot.count; Z$i?p;HnW
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/** 0^L:`[W+
* |0^IX
* @author V6>{k_0{V
*/ &'neOf/~
public class CountBean { R,7.o4Wt
private String countType; io"NqR#"v
int countId; ;Ym6ey0t
/** Creates a new instance of CountData */ lX.1B&T9Lr
public CountBean() {} |-v/
public void setCountType(String countTypes){ UU}Hs}
this.countType=countTypes; A?-t`J
} /: -ig .YY
public void setCountId(int countIds){ ;
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this.countId=countIds; \k$cg~
} e Vj 8u
public String getCountType(){ o7gZc/?n
return countType; .$f0!`
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} , iEGf-!k
public int getCountId(){ 8~!h8bkC
return countId; dr8Q>(ZY
} %U<lS.i
} >!PM5%G
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CountCache.java A\"4[PXpQ
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/* $v8T%'p+
* CountCache.java 3]NKAPY
* 1)e[F#|
* Created on 2007年1月1日, 下午5:01 lq1223
* '[[IalQ?
* To change this template, choose Tools | Options and locate the template under Dir# [j
* the Source Creation and Management node. Right-click the template and choose t&yuo E
* Open. You can then make changes to the template in the Source Editor. 5s0`T]X-
*/ +pv..\
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package com.tot.count; u9 *ic~Nh
import java.util.*; G=Xas"|
/** 5a5JOl$8
* 4X:mb}(
* @author YYe<StyH
*/ AgDXpaq
public class CountCache { !~m PxGY
public static LinkedList list=new LinkedList();
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/** Creates a new instance of CountCache */ SbtZhg=S_
public CountCache() {} %Zeb#//Jz
public static void add(CountBean cb){ F(U(b_DPM
if(cb!=null){ 8M4GforP
list.add(cb); 2_6@&2
} sld cI@Z
} 9y\Ik/
} UOe@R|79q
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CountControl.java -Lsl
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/* HT_nxe`E
* CountThread.java %~<F7qB
* mt *Dx
* Created on 2007年1月1日, 下午4:57 eH;{Ln
* C]zG@O!
* To change this template, choose Tools | Options and locate the template under 43`Atw`\
* the Source Creation and Management node. Right-click the template and choose ;P8.U(
* Open. You can then make changes to the template in the Source Editor. YRaF@?^Gn
*/ 2 I.Q-'@
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package com.tot.count;
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import tot.db.DBUtils; f1\mE~#}
import java.sql.*; Mf9x=K9
/** |l~#qeZ%
* pSx}:u^am
* @author P!R`b9_U
*/ H/0b3I^
public class CountControl{ V4*/t#L/
private static long lastExecuteTime=0;//上次更新时间 bM,%+9oz;
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _k)EqPYu@
/** Creates a new instance of CountThread */ }o=s"0 a
public CountControl() {} 3|Y.+W
public synchronized void executeUpdate(){ UE/iq\a>
Connection conn=null; oJc v D
PreparedStatement ps=null; m.yt?`
try{ ,_'Z Jlx
conn = DBUtils.getConnection(); @
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conn.setAutoCommit(false); s8*Q@0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); wWJM./y
for(int i=0;i<CountCache.list.size();i++){ -+Ox/>k
CountBean cb=(CountBean)CountCache.list.getFirst(); +W|VCz
CountCache.list.removeFirst(); 7MX5hZF"
ps.setInt(1, cb.getCountId()); :<6gP(
ps.executeUpdate();⑴ _nIt4l7
//ps.addBatch();⑵ kc[<5^b5
} q$B|a5a?
//int [] counts = ps.executeBatch();⑶ _]kw |[)
conn.commit(); ?J5E.7o
}catch(Exception e){ T
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e.printStackTrace(); na|23jz4
} finally{ K!tM "`a
try{ 5BM rn0
if(ps!=null) { \`?4PQ
ps.clearParameters(); |zp}u (N
ps.close(); xf3/J{n3
ps=null; &A&2z l %#
}
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}catch(SQLException e){} pq,8z= Uf
DBUtils.closeConnection(conn); #@cEJV;5"
} zE=^}K+
} U;]h/3P
public long getLast(){ *5" )3\/
return lastExecuteTime; 2()/l9.O'
} Y-v6M3$
public void run(){ ]2mfby
long now = System.currentTimeMillis(); dJ7 !je1N*
if ((now - lastExecuteTime) > executeSep) { ^Zq3K
//System.out.print("lastExecuteTime:"+lastExecuteTime); LHusy;<E[
//System.out.print(" now:"+now+"\n"); $mst\]&;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Wl{}>F`W[
lastExecuteTime=now; sWMY
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executeUpdate(); :
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} eq4Yc*|9
else{ M^y5 Dep
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 1v9#Fr Y
} <)$JA
} 4#D>]AX
} Z7=k$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 |EP=<-|
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类写好了,下面是在JSP中如下调用。 7eyx cr;z
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<% _vOSOnU
CountBean cb=new CountBean(); Vdb X4^V
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ?_@Mg\Hc
CountCache.add(cb); 3\?yjL^
out.print(CountCache.list.size()+"<br>"); 6;}W)S
CountControl c=new CountControl(); $+w -r#,
c.run(); fsV_>5I6
out.print(CountCache.list.size()+"<br>"); q4KYC!b
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