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: 8 <;.[l
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CountBean.java PvV\b<Pe+
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/* /klo),|&
* CountData.java ~y"R{-%uS
* ?]Hs~n-
* Created on 2007年1月1日, 下午4:44 (^FMm1@T
* 9)]`le
* To change this template, choose Tools | Options and locate the template under eA(\#+)X `
* the Source Creation and Management node. Right-click the template and choose Ncbe{}<md
* Open. You can then make changes to the template in the Source Editor. O0z-jZ,])
*/ NR(rr.
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package com.tot.count; o
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/** NAE|iyw
* XchD3p+uB
* @author D*~Q;q>
*/ PSu]I?WF
public class CountBean { jrN 5l1np
private String countType; #e-7LmO~
int countId; paD[4L?4Hk
/** Creates a new instance of CountData */ fgtwVji
public CountBean() {} !gRU;ZQU_
public void setCountType(String countTypes){ 0 fT*O
this.countType=countTypes; y~#5!:Be
} Q+K]:c
public void setCountId(int countIds){ U&B(uk(2
this.countId=countIds; cwaR#-#
} 2i!R>`
public String getCountType(){ {@7UfJh>
return countType; ^Ff fc@=
} |>U<EtA"
public int getCountId(){ ;:[P/eg
return countId; {`2 0'
} V?JmIor
} Pfvb?Hy
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CountCache.java $aTo9{M ^
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/* "[["naa
* CountCache.java wjX0r7^@
* h6LjReNo
* Created on 2007年1月1日, 下午5:01 t"%~r3{
* AM!P?${a
* To change this template, choose Tools | Options and locate the template under av(qV$2
* the Source Creation and Management node. Right-click the template and choose 7eM6 B#rI
* Open. You can then make changes to the template in the Source Editor. EMH-[EBx
*/ EiM\`"o
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package com.tot.count; 6I=d0m.io
import java.util.*; gPKO-Fsd"
/** |Zn,|-iW
* %iIr %P?
* @author l@UF-n~[
*/ >/C,1}p[
public class CountCache { /P3Pv"r|8]
public static LinkedList list=new LinkedList(); :k.>H.8+~
/** Creates a new instance of CountCache */ JK^%V\m
public CountCache() {} DPnrzV)
public static void add(CountBean cb){ olo9YrHn
if(cb!=null){ /8_x]Es/
list.add(cb); p|;#frj
} E?K(MT&@
} tx1TtWo
} _pS)bxw
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CountControl.java k~<ORnda
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/* <Vyl*a{%
* CountThread.java /*S6 /#
* }F V_jJ
* Created on 2007年1月1日, 下午4:57 P1TTaYu
* 'zt}\ Dt
* To change this template, choose Tools | Options and locate the template under o~:({
* the Source Creation and Management node. Right-click the template and choose &{M-<M
* Open. You can then make changes to the template in the Source Editor. \3U.;}0_X
*/ $dt*
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package com.tot.count; `o+J/nc
import tot.db.DBUtils; O'k<4'TC
import java.sql.*; )u!}`UJ
/** yq[CA`zVN
* :oZ~&H5Q
* @author 0#ePg6n
*/
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public class CountControl{ i2O$oHd
private static long lastExecuteTime=0;//上次更新时间 `$;%%/tx
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 J(,gLl
/** Creates a new instance of CountThread */ }`$({\^w
public CountControl() {} XHuHbriI
public synchronized void executeUpdate(){ z*^vdi0
Connection conn=null; viS7+E|O
PreparedStatement ps=null; A sf]sU..
try{ F+Hmp\rM#
conn = DBUtils.getConnection(); F JxH{N6a
conn.setAutoCommit(false); jA%R8hdr_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); '! ;Xxe5
for(int i=0;i<CountCache.list.size();i++){ \xZ6+xZd1
CountBean cb=(CountBean)CountCache.list.getFirst(); QN~9O^
CountCache.list.removeFirst(); PsS8b
ps.setInt(1, cb.getCountId()); *zPz)3;
ps.executeUpdate();⑴ (TGG?V
//ps.addBatch();⑵ j =b-Y
} 0s%{m<
//int [] counts = ps.executeBatch();⑶ Fmrl*tr
conn.commit(); _3Q8R}
}catch(Exception e){
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e.printStackTrace(); .TRp74
} finally{ UbwD2>
try{ )d?L*X~y'
if(ps!=null) { n<7R6)j6
ps.clearParameters(); f+dj6!g5/
ps.close(); .sPa${
ps=null; ]M9r<x*
} O:O
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}catch(SQLException e){} K06&.>v_
DBUtils.closeConnection(conn); 5l(NX
} _/[(&}M
} 2Yd;#i)
public long getLast(){ }%eXGdC
return lastExecuteTime; <Okl.Iz>
} Rlf#)4
public void run(){ mOi 8W,2
long now = System.currentTimeMillis(); baM@HpMhM
if ((now - lastExecuteTime) > executeSep) { M)CE%/P
//System.out.print("lastExecuteTime:"+lastExecuteTime); XF N4m #
//System.out.print(" now:"+now+"\n"); a<`s'N1G
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); +~\c1|f
lastExecuteTime=now; !+I!J
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executeUpdate(); mo3HUXf}8
} .EoLJHL
}
else{ rwou[QU
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); u~^d5["T
} Tj*Vk $}0
} 5S?+03h~
} 9i+SU|;j
//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 </8F
:CAbGs:56
类写好了,下面是在JSP中如下调用。 ?KfV>.()
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<% (>\w8]
CountBean cb=new CountBean(); =m?x|Zc_v
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); :Vf :_;
CountCache.add(cb); %7~~*_G
out.print(CountCache.list.size()+"<br>"); =9JKg4I6
CountControl c=new CountControl(); Xm2p<Xu8h
c.run(); !
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out.print(CountCache.list.size()+"<br>"); tk
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