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: MLY19 ;e
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CountBean.java ADA%$NhJ!
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/* rfYu8-
* CountData.java c }ivYH?`w
* MjE.pb
* Created on 2007年1月1日, 下午4:44 EG&^;uU
* n=r}jRH1
* To change this template, choose Tools | Options and locate the template under l7aGo1TcIh
* the Source Creation and Management node. Right-click the template and choose Xn"n5=M
* Open. You can then make changes to the template in the Source Editor. m0 ]LY-t
*/ *x`z5_yfO
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package com.tot.count; 4DEsB)%X
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/** R%aH{UhE`
* J><O
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* @author L;nRI.
*/ 52m^jT Sx
public class CountBean { ?Li^XONz
private String countType; ]?-56c,
int countId; T =3te|fv
/** Creates a new instance of CountData */ 5h1!E
public CountBean() {} C-qsyJgZy
public void setCountType(String countTypes){ >tr?5iKxc
this.countType=countTypes; "+_]N9%)
} vKAHf;1
public void setCountId(int countIds){ Cd'P
this.countId=countIds; I.R3?+tZ
} FO_nS
public String getCountType(){ =G}_PRn
return countType; =/6.4;8
} .`Z{ptt>
public int getCountId(){ k}ps-w6:
return countId; "x9xJ
} z:u`W#Rf
} B_hob
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CountCache.java @EfCNOy
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/* *Vfas|3hZI
* CountCache.java }Bc'(2A;,
* ?#}=!$p
* Created on 2007年1月1日, 下午5:01 :m8ED[9b
* kjaz{&P
* To change this template, choose Tools | Options and locate the template under n#z^uq|v
* the Source Creation and Management node. Right-click the template and choose Vnh
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* Open. You can then make changes to the template in the Source Editor. 3mWo`l
*/ rctn0*MP
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package com.tot.count; gK(E0p"
import java.util.*; XYod>[.x
/** *Q!b%DIa$
* hNDhee`%6
* @author (N;Jw^C@
*/ mI9h| n
public class CountCache {
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public static LinkedList list=new LinkedList(); F1M@$S,
/** Creates a new instance of CountCache */ "oz@w'rG
public CountCache() {} 7;CeQx/W)W
public static void add(CountBean cb){ [2i+f<
if(cb!=null){ `Z|sp
list.add(cb); =#BeAsFfO
} rO]C`bg
} *!Am6\+
} yp@mxI@1
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CountControl.java {!N4|
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/* LvWU
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* CountThread.java GZZLX19sq
* U&u7d$AN P
* Created on 2007年1月1日, 下午4:57
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* #> CN,eiZ
* To change this template, choose Tools | Options and locate the template under ljiq +tT
* the Source Creation and Management node. Right-click the template and choose OzO_E8Kb\
* Open. You can then make changes to the template in the Source Editor. ]XPGlM
*/ bx6@FKns}
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package com.tot.count; C{!Czz.N
import tot.db.DBUtils; ykM#EyN
import java.sql.*; g,,cV+
/** _'I9rGlx3
* EAY9~b6~c
* @author lg8~`96
*/ ]m4LY.SQ
public class CountControl{ *r-Bt1
private static long lastExecuteTime=0;//上次更新时间 }\823U
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +B8Ut{l
/** Creates a new instance of CountThread */ vnN_csJ#^
public CountControl() {} UD9h5PgT
public synchronized void executeUpdate(){ $35Oyd3s<
Connection conn=null; e. [+xOu`
PreparedStatement ps=null; b%oma{I=.c
try{ etTuukq_Z
conn = DBUtils.getConnection(); 50I6:=@\\
conn.setAutoCommit(false); mceSUKI;L
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 1Rczf (,aT
for(int i=0;i<CountCache.list.size();i++){ =x7ODBYW^
CountBean cb=(CountBean)CountCache.list.getFirst(); Ev^Xs6 }"
CountCache.list.removeFirst(); [w{ZP4d>
ps.setInt(1, cb.getCountId()); whLske-
ps.executeUpdate();⑴ qh2.N}lW
//ps.addBatch();⑵ Ey6K@@%
} %1=W#jz
//int [] counts = ps.executeBatch();⑶ ux=a9
conn.commit(); yBl<E$=
}catch(Exception e){ 8vT:icl
e.printStackTrace(); I7uYsjh@u
} finally{ }s)Z:6;(,q
try{ }K*ri
if(ps!=null) { PH7L#H^
ps.clearParameters(); gIRCJ=e[b
ps.close(); S;t~"87v*
ps=null; +?.,pq n<=
} F;b|A`M
}catch(SQLException e){} ;m5M:Z"
DBUtils.closeConnection(conn); ?DRC!
9o^
} Ee|@l3)
} p0tv@8C>
public long getLast(){ V`H#|8\i
return lastExecuteTime; <pE G8_{}
} ]Yj>~k:K
public void run(){ !e7vc[N
long now = System.currentTimeMillis(); p/:5bvA
if ((now - lastExecuteTime) > executeSep) { c8'8DM
//System.out.print("lastExecuteTime:"+lastExecuteTime); .Gv~e!a8
//System.out.print(" now:"+now+"\n"); Ym6ec|9;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); (8*lLZ
lastExecuteTime=now; `j(+Y
executeUpdate(); <N*>9S,}
} asF-mf;D
else{ <G&v
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); _4W#6!
} srSTQ\l4
} x:bYd\
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} <VBw1|)$@
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 : 1{j&$
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类写好了,下面是在JSP中如下调用。 |`okIqp
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<% ex=~l O
CountBean cb=new CountBean(); %*gO<U4L]
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); eeDhTw9
CountCache.add(cb); jG2w(h/"
out.print(CountCache.list.size()+"<br>"); [D,:=p`
CountControl c=new CountControl(); |u+&xX7
c.run(); D#$gdjZ
out.print(CountCache.list.size()+"<br>"); 4w?7AI]Ej
%>