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: R) h#Vc(
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CountBean.java V1zmG y
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/* ebhXak[w
* CountData.java u&vf+6=9Dd
* khxnlry
* Created on 2007年1月1日, 下午4:44 +\]\[6
* t{9GVLZ
* To change this template, choose Tools | Options and locate the template under \V63qg[
* the Source Creation and Management node. Right-click the template and choose g:@#@1rB6
* Open. You can then make changes to the template in the Source Editor. oZgjQM$YP
*/ _jVN&\A]mC
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package com.tot.count; q.bSIV|
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/** :3Ox~o
* 4pF*"B
* @author M|h3Wt~7
*/ ;$|nrwhy
public class CountBean { TIDO@NwF
private String countType; Wn2NMXK
int countId;
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/** Creates a new instance of CountData */ hn@08t G
public CountBean() {} cV6D<,)
public void setCountType(String countTypes){ KV *#T20T
this.countType=countTypes; .`eN8Dl1
} Dz/ "M=
public void setCountId(int countIds){ T!#GW/?
this.countId=countIds; + &Eqk
} YD6'#(
public String getCountType(){ (w3YvG.
return countType; 2/^3WY1U
} ES7s1O$#
public int getCountId(){ C,r;VyW6BI
return countId; *i%d,w0+
} U8?mc
} d7upz]K9g
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CountCache.java g!|kp?
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/* :5<UkN)R(
* CountCache.java #;yZ
* =;
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* Created on 2007年1月1日, 下午5:01 N4!O.POP
* Ti5-6%~&
* To change this template, choose Tools | Options and locate the template under 6H$FhJF
* the Source Creation and Management node. Right-click the template and choose -Q*gW2KmV
* Open. You can then make changes to the template in the Source Editor. O^
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*/ <]2w n
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package com.tot.count; 4D4j7
import java.util.*; NXrlk
/** 7?_CcRe
* L="}ErmK
* @author )Aqtew+A&
*/ 3]S$ih&A
public class CountCache { gM:".Ee
public static LinkedList list=new LinkedList(); :$c
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/** Creates a new instance of CountCache */ ;.980+i1
public CountCache() {} ;e *!S}C,
public static void add(CountBean cb){ 7!E,V:bt'
if(cb!=null){ } q8ASYNc
list.add(cb); 4tBYR9|
} =7eV/3
} "chDg(jMZ
} Wne@<+mX
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CountControl.java S,he6zS
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/* |CyE5i0
* CountThread.java 4kx
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* /\n-P'}
* Created on 2007年1月1日, 下午4:57 'H;*W |:-]
* iH@UTE ;
* To change this template, choose Tools | Options and locate the template under L!xi
* the Source Creation and Management node. Right-click the template and choose '`Hr}
* Open. You can then make changes to the template in the Source Editor.
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*/ <LiPEo.R
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package com.tot.count; f@!.mDm]
import tot.db.DBUtils; \9T7A&
import java.sql.*;
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/** 6'f;-2
* #H~64/
* @author mC#>33{
*/ 0g8NHkM:2a
public class CountControl{ `ERz\`d~Y;
private static long lastExecuteTime=0;//上次更新时间 M_DwUS1?
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +NUG
/** Creates a new instance of CountThread */ abVmkdP_s
public CountControl() {} eHUOU>&P]
public synchronized void executeUpdate(){ kAUymds;O
Connection conn=null; f!X[c?Xy"
PreparedStatement ps=null; ~P-mC@C
try{ CrTw@AW9)
conn = DBUtils.getConnection(); p!%pP}I
conn.setAutoCommit(false); G3T]`Atf
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); -QNh
for(int i=0;i<CountCache.list.size();i++){ ~k5W@`"W
CountBean cb=(CountBean)CountCache.list.getFirst(); JxU5 fe
CountCache.list.removeFirst(); Q7CsJzk~)
ps.setInt(1, cb.getCountId());
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ps.executeUpdate();⑴ t]G:L}AOl
//ps.addBatch();⑵ X:{!n({r=
} @H8EWTZ
//int [] counts = ps.executeBatch();⑶ seJ^s@H5l
conn.commit(); {'H(g[k
}catch(Exception e){ \ Cj7k^
e.printStackTrace(); mt.))#1
} finally{ Y'X%Aw;`
try{ T)_hpt.
if(ps!=null) { >H,*H;6
ps.clearParameters(); owv[M6lbD
ps.close(); ^-'fW7[m
ps=null; wMN]~|z>
} &K,i
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}catch(SQLException e){} R4d=S4i
DBUtils.closeConnection(conn); Tlr v={
} Xch~
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} .=;
;
public long getLast(){ )V9bI( v
return lastExecuteTime; ~gt@P
} dj%!I:Q>u
public void run(){ @C aG9]
long now = System.currentTimeMillis(); A3*!"3nU
if ((now - lastExecuteTime) > executeSep) { alb.g>LNPP
//System.out.print("lastExecuteTime:"+lastExecuteTime); TA~{1_l
//System.out.print(" now:"+now+"\n"); `Q,H|hp;k;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); X}0cCdW
lastExecuteTime=now; a8Wwq?@
executeUpdate(); aw> #P
} _o~nr]zx
else{ 8q7b_Pq1U
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3G4-^hY<
} c:.eGH_f
} &%Tj/ Qx
} ,R|BG
//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 93hxSRw
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类写好了,下面是在JSP中如下调用。 ddR>7d}N
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<% -s/ea~=R
CountBean cb=new CountBean(); u]@['7
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); wz8yD8M
CountCache.add(cb); ^<AwG=
out.print(CountCache.list.size()+"<br>"); hpk7 Anp
CountControl c=new CountControl(); U
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c.run(); P0b7S'a4!
out.print(CountCache.list.size()+"<br>"); $ME)#(
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