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: Gu,wF(x7A
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CountBean.java c]<5zyl"j1
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/* k'Hs}z eNn
* CountData.java &B;~
* M?49TOQA
* Created on 2007年1月1日, 下午4:44 *R,5h2;
* `hm-.@f,9
* To change this template, choose Tools | Options and locate the template under nPtuTySG
* the Source Creation and Management node. Right-click the template and choose bs&43Ae
* Open. You can then make changes to the template in the Source Editor. }K>d+6qk5
*/ dDMJ'
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package com.tot.count; ]q[D>6_
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/** zk+9'r`-D
* [aLI
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* @author @bLy,Xr&
*/ B@))8.h]
public class CountBean { t+
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private String countType; gg/-k;@ Rf
int countId; iVr J Q
/** Creates a new instance of CountData */ ^CH=O|8j
public CountBean() {} 8d{0rqwNE
public void setCountType(String countTypes){ J{<X7uB
this.countType=countTypes; Hio0HL-
} S+6.ZZ9c
public void setCountId(int countIds){ z6P$pqyF
this.countId=countIds; *a^(vo
} B mb0cFQ
public String getCountType(){ "{xrL4BtC
return countType; {fM'6;ak
} ~=LE0. 3[
public int getCountId(){ hE/cd1iJ$
return countId; ) q4[zv9
} ^
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} #%2rP'He
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CountCache.java ;;t yoh~t
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/* {Mk6T1Bkq
* CountCache.java `(;m?<%
* /}Axf"OE
* Created on 2007年1月1日, 下午5:01 |-ALklXr
* Rv>-4@fMJ
* To change this template, choose Tools | Options and locate the template under #X$\&,Yn"
* the Source Creation and Management node. Right-click the template and choose W@IQ^
}E
* Open. You can then make changes to the template in the Source Editor. ,qwuLBW
*/ ue"~9JK.
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package com.tot.count; d-ko
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import java.util.*; G*MUO#_iuh
/** 7A7?GDW
* 8Fh)eha9f
* @author >'$Mp <
*/ Y@iS_lR
public class CountCache { |e&\<LwsP
public static LinkedList list=new LinkedList(); ~ Iuf}D;
/** Creates a new instance of CountCache */ $I>w]
public CountCache() {} 29b9`NXt
public static void add(CountBean cb){ e9tjw[+A
if(cb!=null){ qR{=pR
list.add(cb); cjY-y-vO
} 6MW{,N
} Izc\V9+
} %1L,Y
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CountControl.java }8z?t:|S
} OR+Io
/* j (d~aqW
* CountThread.java "k@/3
* \)[j_^
* Created on 2007年1月1日, 下午4:57 Q&;9x? e
* ?V=ZIGj
* To change this template, choose Tools | Options and locate the template under ru%y
* the Source Creation and Management node. Right-click the template and choose EZGIf/ 3
* Open. You can then make changes to the template in the Source Editor. pv&sO~!iC
*/ eByz-,{P
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package com.tot.count; JQI: sj
import tot.db.DBUtils; q;CiV
import java.sql.*; A)!*]o>U
/** x,-75
* ioCsV
* @author )&O
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*/ 3
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public class CountControl{ BWrxunHO
private static long lastExecuteTime=0;//上次更新时间 BU_nh+dF
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 AT3Mlz~7#
/** Creates a new instance of CountThread */ _{KG
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public CountControl() {} ND;#7/$>
public synchronized void executeUpdate(){ cI*;k.KU
Connection conn=null; p2](_}PK
PreparedStatement ps=null; Fxz"DZY6
try{ fr3d
conn = DBUtils.getConnection(); y%T_pTcU
conn.setAutoCommit(false); kevrsV]/$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /3T1U
for(int i=0;i<CountCache.list.size();i++){ Gd=RyoJl
CountBean cb=(CountBean)CountCache.list.getFirst(); KpGhQdR#
CountCache.list.removeFirst(); niyV8v
ps.setInt(1, cb.getCountId()); tWRC$
ps.executeUpdate();⑴ >GRxHK@G
//ps.addBatch();⑵ RrB&\9=
} b$joY*< 6
//int [] counts = ps.executeBatch();⑶ >bW#Zs,6
conn.commit(); `^&OF uee
}catch(Exception e){ eauF~md,
e.printStackTrace(); Q
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} finally{ KRzAy)8
try{ Yq
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if(ps!=null) { %u'ukcL7
ps.clearParameters(); 6&x@.1('z
ps.close(); 7:1Lol-V
ps=null; c@7rqHU-0
} p5iuYHKk?
}catch(SQLException e){} ez$(c
DBUtils.closeConnection(conn); Rm( "=(
} }7Q% 6&IR
} ga +dt
public long getLast(){ ux4POO3C|
return lastExecuteTime; i_%_ x*
} !|(NgzDP/
public void run(){ N6:`/f+A>T
long now = System.currentTimeMillis(); 1+s;FJ2}
if ((now - lastExecuteTime) > executeSep) { sgFEK[w.y
//System.out.print("lastExecuteTime:"+lastExecuteTime); k,*XG$2h
//System.out.print(" now:"+now+"\n"); *2l7f`K
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !Vk^TFt`
lastExecuteTime=now; 7@Qcc t4A
executeUpdate(); * EH~_F
} 1qA;/-Zr<o
else{ M= (u]%\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !Uo4,g6r+
} $UwCMPs X
} `c$V$/IT
} 9.#<b|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 ~xFkU#
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类写好了,下面是在JSP中如下调用。 W=?<<dVYD
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<% Bzf^ivT3L
CountBean cb=new CountBean(); I?CZQ+}Hq
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); i
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CountCache.add(cb); H5|;{q:j
out.print(CountCache.list.size()+"<br>"); Pm7}"D'/
CountControl c=new CountControl(); @0''k
c.run(); e0 ecD3
out.print(CountCache.list.size()+"<br>"); |G<|F`Cj
%>