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: !OgoV22
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CountBean.java <t37DnCgI
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/* ]_8 \g`"u
* CountData.java %([H*sLX
* \hN2w]e
* Created on 2007年1月1日, 下午4:44 RhmVHhj
* oF
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* To change this template, choose Tools | Options and locate the template under k"{U}Y/}
* the Source Creation and Management node. Right-click the template and choose V7_??L%Ct`
* Open. You can then make changes to the template in the Source Editor. <5~>.DuE
*/ ]bweQw@i
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package com.tot.count; eCd?.e0@j
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/** \"Iy<zG
* Dx'e+Bm
* @author dxWw%_Q
*/ 'v
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public class CountBean { JvaaBXkS\
private String countType; c.v)M\:
int countId; l:f
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/** Creates a new instance of CountData */ ?s33x#
public CountBean() {} cyNLeg+O*
public void setCountType(String countTypes){ mu sxX58%
this.countType=countTypes; Zh^w)}(W
} 64fG,b
public void setCountId(int countIds){ `Cxe`w4
this.countId=countIds; ow[qpP[
} glgk>83I+
public String getCountType(){ sc60:IxgI
return countType; #mYxO
} CV "Y40
public int getCountId(){ HXI}f\6x
return countId; tO3 ;;%
} 063;D+
} yk{al SF
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CountCache.java kM`#U
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/* {eUfwPAa3
* CountCache.java Dy!fwYPA/{
* VIzZmd
* Created on 2007年1月1日, 下午5:01 PK"
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* 'zK*?= ^jk
* To change this template, choose Tools | Options and locate the template under i;Y^}2
* the Source Creation and Management node. Right-click the template and choose 7i.aZ2a%
* Open. You can then make changes to the template in the Source Editor. sSUd;BYf
*/ aDuanGC/V
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package com.tot.count; "#jKk6{I0
import java.util.*;
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/** K#r`^aUc
* I]X<L2
* @author kZQ;\QL1}
*/ UhK,H
public class CountCache { e{&gF1"[
public static LinkedList list=new LinkedList(); 3yN1cd"#?
/** Creates a new instance of CountCache */ r$5!KO
public CountCache() {} 51x,[y+Xe
public static void add(CountBean cb){ :cTi$n
if(cb!=null){ if>] )g2lr
list.add(cb); RMK
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} X;h~s:LM
}
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} 4a-wGx#h
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CountControl.java "Q1hP9xV
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/* 0P(}e[~Z
* CountThread.java M &J*I
* ]mSVjF3l
* Created on 2007年1月1日, 下午4:57 ?L^ Gu ]y
* . {I7sUQ
* To change this template, choose Tools | Options and locate the template under =%LS9e^7D
* the Source Creation and Management node. Right-click the template and choose 7Y/_/t~Y
* Open. You can then make changes to the template in the Source Editor. qM+T Wp
*/
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package com.tot.count; wal }[F#
import tot.db.DBUtils; $`%.Y&A
import java.sql.*; #Z : r
/**
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* :[doYizk:
* @author R<-KXT9
*/ &3<]FK
public class CountControl{ /NZR|
private static long lastExecuteTime=0;//上次更新时间 JS9q'd
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +\4=G@P.J
/** Creates a new instance of CountThread */ DcS~@ ;
public CountControl() {} 6%TV X
public synchronized void executeUpdate(){ ''G@n*
Connection conn=null; ^s5)FdF8
PreparedStatement ps=null; 2;/hFwm
try{ 4y'REC
conn = DBUtils.getConnection(); ":OXs9Yg
conn.setAutoCommit(false); SPBXI[[-
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =B 9U
for(int i=0;i<CountCache.list.size();i++){ xQQ6D
CountBean cb=(CountBean)CountCache.list.getFirst(); 0!Yi.'+
CountCache.list.removeFirst();
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ps.setInt(1, cb.getCountId()); ;I>`!|mT
ps.executeUpdate();⑴ +xMDm_TGLA
//ps.addBatch();⑵ RaAq>B
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} pS0T>r
//int [] counts = ps.executeBatch();⑶ b> |oU
conn.commit(); -Db(
}catch(Exception e){ g(1'i 1
e.printStackTrace(); Uu
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} finally{ ~c4Y*]J
try{ Ae1},2py
if(ps!=null) { "'%x|nB
ps.clearParameters(); xfb%bkr
ps.close(); J#\/znT
ps=null; ~jgd92`{z
} V;$lgTs|'
}catch(SQLException e){} ?S"xR0 *
DBUtils.closeConnection(conn); &3rh{" ^9
} ?pFHpz
} k:fRk<C
public long getLast(){ 4_$f"6
return lastExecuteTime; AWw:N6\
}
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public void run(){ ipsNiFv:
long now = System.currentTimeMillis(); so;aN'{6@
if ((now - lastExecuteTime) > executeSep) { :M Md@
//System.out.print("lastExecuteTime:"+lastExecuteTime); 4R6X"T9-
//System.out.print(" now:"+now+"\n"); E>&dG:3no
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); q;rU}hAzG0
lastExecuteTime=now; ^VA)vLj@
executeUpdate(); _Q QO&0Z
} =&vV$UtV
else{ YPN|qn(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); `|gCbs95
} GFvOrRlP\
} BP` UB
} yY}`G-)g~*
//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 1UOFTI2S|
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类写好了,下面是在JSP中如下调用。 kY|<1Ht
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<% (q)W<GYP
CountBean cb=new CountBean(); @ ~PL|Pp_
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); xMe[/7)4
CountCache.add(cb); &4DWLI
out.print(CountCache.list.size()+"<br>"); ~U`aH~R
CountControl c=new CountControl(); 1_A< nt?'R
c.run(); ;lGjj9we>
out.print(CountCache.list.size()+"<br>"); c Mq|`CM
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