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: N:Zf4
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CountBean.java =)Q0=!%-
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/* =C.WM*= '
* CountData.java =3Hv
* Um'r6ty
* Created on 2007年1月1日, 下午4:44 !4l\*L
* ``4lomz>
* To change this template, choose Tools | Options and locate the template under xg2
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* the Source Creation and Management node. Right-click the template and choose M,b^W:('4
* Open. You can then make changes to the template in the Source Editor. ,HM~Zs
*/ [r5k8TB1
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package com.tot.count; *X4$'LSx1
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/** znl_~:.4]X
* Tx'ctd#Y
* @author N$SJK
*/ +B0G[k7
public class CountBean { v/B:n
private String countType; rv?d3QqIC
int countId; {l -V
/** Creates a new instance of CountData */ v
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public CountBean() {} 8^Ov.$rP
public void setCountType(String countTypes){ j,/t<@S>
this.countType=countTypes; `F<[\@\d5
} B=`"!?we
public void setCountId(int countIds){ 9&`ejeD
this.countId=countIds; )c$)am\I{
} >av.pJ(>
public String getCountType(){ ';z5]O~
return countType; -'OO6mU
} NJglONO
public int getCountId(){ h8MkfHH7{
return countId; ]XH}G9X^
} [o,S.!W8
} )d|hIW]7(
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CountCache.java BsX#
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/* ?) ~j>1"S
* CountCache.java 4{r_EV[(
* q;V1fogqI)
* Created on 2007年1月1日, 下午5:01 $iblLZhj
* %aszZP
* To change this template, choose Tools | Options and locate the template under :9E_L2M
* the Source Creation and Management node. Right-click the template and choose 5vso%}c
* Open. You can then make changes to the template in the Source Editor. FiQx5}MMhu
*/ 5E+k}S]M$
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package com.tot.count; rpNe8"sh
import java.util.*; D@ji1$K
/** iY2%_b!5
* z4nVsgQ$
* @author !r8Jo{(pb
*/ y=jTS
public class CountCache { a;A&>Ei}
public static LinkedList list=new LinkedList(); oEWx9c{~$
/** Creates a new instance of CountCache */ 2F[;Z*&
public CountCache() {} V!SB9t`E
public static void add(CountBean cb){ Z)U#5|sf
if(cb!=null){ ;')T}wuq
list.add(cb); 0CD2o\`8
} G"BoD 5m
} ):_x
} d%istFL)
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CountControl.java 995^[c1o6
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/* Lu~e^Ul
* CountThread.java GZN@MK*co
* +"]'h~W
* Created on 2007年1月1日, 下午4:57 8elT/Wl
* iK"j@1|
* To change this template, choose Tools | Options and locate the template under `f^`i~c\
* the Source Creation and Management node. Right-click the template and choose Ccocv>=Q&J
* Open. You can then make changes to the template in the Source Editor. a91Q*X%
*/ /rNY;qXM
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package com.tot.count; +M\*C#
import tot.db.DBUtils; ] 05Q4
import java.sql.*; BX),U
/** tc{23Rf%
* b'N"?W^YQ
* @author aNW&ib
*/ P-~Avb
public class CountControl{ ~X;(m<f2
private static long lastExecuteTime=0;//上次更新时间 #oYX0wvl
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9tS&$-
/** Creates a new instance of CountThread */ ]T+.kC
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public CountControl() {} >NE]TZ.F
public synchronized void executeUpdate(){
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Connection conn=null; qR_"aQ7s2
PreparedStatement ps=null; UY**3MK
try{ @ %z5]w
conn = DBUtils.getConnection(); zYOPE 6E
conn.setAutoCommit(false); n20H{TA
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); IBVP4&}x$
for(int i=0;i<CountCache.list.size();i++){ -}UCdaQ3
CountBean cb=(CountBean)CountCache.list.getFirst(); 0zpP$q$
CountCache.list.removeFirst(); ,Z%!38gGsu
ps.setInt(1, cb.getCountId()); [,5clR=F
ps.executeUpdate();⑴ -X4`,0y%{O
//ps.addBatch();⑵ _<.R \rX&
} {\t:{.F
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//int [] counts = ps.executeBatch();⑶ y|KDh'Y
conn.commit(); ^d"tymDd
}catch(Exception e){ (6\A"jey\x
e.printStackTrace(); ,ASY
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} finally{ =]E1T8|
try{ cQPH le2
if(ps!=null) { T6H"ER$
ps.clearParameters(); iA ZtV'VQ)
ps.close(); vS<;:3
ps=null; q0y?$XS
} /KKX;L[D(
}catch(SQLException e){} v *:m|wl
DBUtils.closeConnection(conn); TF^]^XS'
} 3iWLo Qm
} t9pPG {1
public long getLast(){ nbpN+a%
return lastExecuteTime; 7<.f&1MgI
} =GR
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public void run(){ '~ ]b;nA
long now = System.currentTimeMillis(); GZ'hj_2%<
if ((now - lastExecuteTime) > executeSep) { <6apv(2a
//System.out.print("lastExecuteTime:"+lastExecuteTime); g6W.Gl"5\w
//System.out.print(" now:"+now+"\n"); y+:<
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); cDTDim1F
lastExecuteTime=now; GW
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executeUpdate(); <{-DYRiN
} 6!Isz1.re
else{ N7#GK]n%/}
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); gdC=SFb b
} "Pys3=h
} 6ldDt?iSg
} fQx 4/4j
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 R4qk/@]t
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类写好了,下面是在JSP中如下调用。 m dC. FO-
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<% G#%
=R`k/
CountBean cb=new CountBean(); rbtPG=t_R
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \W@?revK
CountCache.add(cb); sox90o 7
out.print(CountCache.list.size()+"<br>"); F37,u|
CountControl c=new CountControl(); <I|ryPU9{X
c.run(); jA]xpf6}
out.print(CountCache.list.size()+"<br>"); v5$zz w
%>