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: KMK&[E#r
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CountBean.java tjZ \h=
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/* p{ @CoOn
* CountData.java mVv\bl?<
* G}!7tU
* Created on 2007年1月1日, 下午4:44 OuOk=
* k]SAJ~bS|
* To change this template, choose Tools | Options and locate the template under y:[BP4H ?y
* the Source Creation and Management node. Right-click the template and choose s;fVnaqG:
* Open. You can then make changes to the template in the Source Editor.
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*/ LbJtpwz>z
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package com.tot.count; ~9JW#HHzn
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/** E /fw?7eQ
* Yz&*PPx
* @author QU^/[75Ea0
*/ xab]q$n]k
public class CountBean { 87QZun%
private String countType; ="uKWt6n'
int countId; V I6\
/** Creates a new instance of CountData */ M"=8O>NZ2
public CountBean() {} $h G;2v
public void setCountType(String countTypes){ I86e&"40
this.countType=countTypes; s<A*[
} ^ckj3Y#;
public void setCountId(int countIds){ Yv)Bj
this.countId=countIds; yWj9EHQU[
} 5/& 1Oxo
public String getCountType(){ T)WZ_bR
return countType; Y]C;T
} hc-lzYS
public int getCountId(){ /635B*g
return countId; 33Ssylno
} #/OUGeJ
} |h5kg<Zgo
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CountCache.java \\=.6cg<K
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/* Dn~Z SrJ
* CountCache.java NTqo`VWe
* [f<"p[
* Created on 2007年1月1日, 下午5:01 q1YLq(e
* oi7
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* To change this template, choose Tools | Options and locate the template under 9*#$0Y=
* the Source Creation and Management node. Right-click the template and choose _h0-
* Open. You can then make changes to the template in the Source Editor. ?22d},.
*/ nIf N"
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package com.tot.count; ]EB6+x!G
import java.util.*; 12 idM*
/** '@'B>7C#
* 7t'(`A6t/
* @author |q3f]T&+>{
*/ `vudS?
public class CountCache { G49Ng|qn
public static LinkedList list=new LinkedList(); bfFmTI$,
/** Creates a new instance of CountCache */ 31WZJm^
public CountCache() {} $Axng
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public static void add(CountBean cb){ <5dH *K
if(cb!=null){ x+4vss
list.add(cb); iJ}2"i7M
} m&Lt6_vi
} Z.!g9fi8>
} egfi;8]E
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CountControl.java E]NY
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/* "X`RQ6~]>
* CountThread.java BsKbn@'uC
* p~h4\.*`
* Created on 2007年1月1日, 下午4:57 t) LU\!
* Q/p(#/y#b
* To change this template, choose Tools | Options and locate the template under IWQ&6SDW$z
* the Source Creation and Management node. Right-click the template and choose Bb~5& @M|N
* Open. You can then make changes to the template in the Source Editor. d+tj%7
*/ 0f1H8zV
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package com.tot.count; wTTRoeJ}
import tot.db.DBUtils; 9hy'DcSy,
import java.sql.*; XM$GQn]B
/** ;v_ls)_,-
* */nuv
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* @author dgXg kB'
*/ s3seK6x'
public class CountControl{ ! Q!&CG5l
private static long lastExecuteTime=0;//上次更新时间 i<mevL
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3c b[RQf
/** Creates a new instance of CountThread */ =nzFd-P
public CountControl() {} [eyb7\#
public synchronized void executeUpdate(){ V"O9n[ |
Connection conn=null; H.:9:I[n
PreparedStatement ps=null; KGu= ;
try{ `qE4U4
conn = DBUtils.getConnection(); J;~E<_"Hn
conn.setAutoCommit(false); N r<9u$d9=
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); TFO74^
for(int i=0;i<CountCache.list.size();i++){ i-b1d'?Rb
CountBean cb=(CountBean)CountCache.list.getFirst(); CJp-Y}fGEA
CountCache.list.removeFirst(); I:F
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ps.setInt(1, cb.getCountId()); /u=aX
ps.executeUpdate();⑴ >5.zk1&H
//ps.addBatch();⑵ `$at9
} okz]Qc>G
//int [] counts = ps.executeBatch();⑶ EY~7oNfc`R
conn.commit(); >PIPp7C
}catch(Exception e){ 8
}-7{
e.printStackTrace(); ABcBEv3
} finally{ [m\,+lG?)j
try{ 8'KMxR
if(ps!=null) { iX{H,-C
ps.clearParameters(); fWj@e"G
ps.close(); X@!X6j
ps=null; hfg
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} ,ijW(95{k
}catch(SQLException e){} )A"jVQjI%w
DBUtils.closeConnection(conn); PK+ x6]x
} gKWzFnW
}
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public long getLast(){ ailG./I+
return lastExecuteTime; KSc~GP_
} j{)~QD ?
public void run(){ jB!W2~Z
long now = System.currentTimeMillis(); Y''6NGf
if ((now - lastExecuteTime) > executeSep) { a%E8(ms37y
//System.out.print("lastExecuteTime:"+lastExecuteTime); M6_-f ;.
//System.out.print(" now:"+now+"\n"); r{S=Z~J
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); =U NT.]
lastExecuteTime=now; )pS8{c)E
executeUpdate(); g2=}G <*0
} \-OC|\{32
else{ 0R|K0XH#$
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Z(HZB
} D-pX<0-y
} t!{x<9
} l<xFnj
//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 gLD{1-v
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类写好了,下面是在JSP中如下调用。 B'p5M.6d#:
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<% [/OQyb4F<
CountBean cb=new CountBean(); MtUY?O.P2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); n+?-
CountCache.add(cb); c|lU(Tf
out.print(CountCache.list.size()+"<br>"); #W|!fILL
CountControl c=new CountControl(); IBET'!j4"
c.run(); ufPCx|x~
out.print(CountCache.list.size()+"<br>"); H* /&A9("
%>