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: T-TH.
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CountBean.java \2!$HA7P
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/* y]_DW6W
* CountData.java p'*UM%@SIY
* 9iE66N>z
* Created on 2007年1月1日, 下午4:44 :83"t-O8[
* r "R\
* To change this template, choose Tools | Options and locate the template under D~:fn|/Brp
* the Source Creation and Management node. Right-click the template and choose s-B\8&^C
* Open. You can then make changes to the template in the Source Editor. X'm2uOEj
*/ x?IT#ty
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package com.tot.count; -E7\.K3
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/** lLhCk>a
* %Y TIS*+0
* @author |.A>0-']M
*/ ?H&p zY~H
public class CountBean { `O/)q^m1L
private String countType; L/I-(08!Y:
int countId; 0bE_iu>f'
/** Creates a new instance of CountData */ _f`m/l
public CountBean() {} nq=fSK(
public void setCountType(String countTypes){ >. Y~F(
this.countType=countTypes; )[1m$>
} /L.a:Er$
public void setCountId(int countIds){ F@BNSs N=
this.countId=countIds; -)@.D>HsOt
} 6D],275`J
public String getCountType(){ $m>e!P>%u
return countType; UL/>t}AG
} P7b2I=t
public int getCountId(){ ,o)MiR9-[A
return countId; _*9Zp1r
} Gm.hBNgp
} !Xm: $KH
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CountCache.java Q$%@.@
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/* vF,l?cU~
* CountCache.java 9O"?T7i"#
* ;IT^SHym
* Created on 2007年1月1日, 下午5:01 #d~"bn q;c
* zkMQ=,[
* To change this template, choose Tools | Options and locate the template under m"*:XfOL
* the Source Creation and Management node. Right-click the template and choose RY'y%6Z]ZO
* Open. You can then make changes to the template in the Source Editor. oZ}e
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*/ g:Dg?_o
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package com.tot.count; luMNi^FQ
import java.util.*; CbZ1<r" /
/** )~`zjVx_
* jnTl%aQYc
* @author NQAnvX;
*/ sCUPa-cHF
public class CountCache { gJ])A7O
public static LinkedList list=new LinkedList(); +K?h]v]%
/** Creates a new instance of CountCache */ ')BQ 0sg
public CountCache() {} so7;h$h!H
public static void add(CountBean cb){ ld
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if(cb!=null){ W.a/k7 p
list.add(cb); L6a8%%`
} EVf'1^f
} ciTQH (G
} sqw _c{9
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CountControl.java 7,1idY%cy
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/* W{0:8_EI
* CountThread.java Q-"FmD-Yw
* ;Gi w7a)
* Created on 2007年1月1日, 下午4:57 u7mj
* :.dQY=6I
* To change this template, choose Tools | Options and locate the template under g@QpqrT
* the Source Creation and Management node. Right-click the template and choose c|7Pnx%gT
* Open. You can then make changes to the template in the Source Editor. R8 m/Nt2
*/ 7-5q\[ZK
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package com.tot.count; U2aE:$oeYi
import tot.db.DBUtils; BXdT;b"J(
import java.sql.*; %VMazlM15
/** rdb%/@.-
* |3i~?]
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* @author NB^.$39n
*/ J=$v+8&.
public class CountControl{ sJr$[?
private static long lastExecuteTime=0;//上次更新时间 4Mprc~ 7vr
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3!,%;Vz=
/** Creates a new instance of CountThread */ {\V)bizY;
public CountControl() {} DirWe
public synchronized void executeUpdate(){ t3M/ThIE
Connection conn=null; ,Xn%-OT
PreparedStatement ps=null; ESO(~X+
try{ IQM!dC
conn = DBUtils.getConnection(); Cxh9rUe.
conn.setAutoCommit(false); V><P`
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); y?rsfIth`
for(int i=0;i<CountCache.list.size();i++){ s#Le`pGoW
CountBean cb=(CountBean)CountCache.list.getFirst(); Ev()2 80
CountCache.list.removeFirst(); %$cwbh-{{
ps.setInt(1, cb.getCountId()); 5`+*({
ps.executeUpdate();⑴ ?eu=0|d
//ps.addBatch();⑵ 3] !(^N>V
} r[gV`khka
//int [] counts = ps.executeBatch();⑶ +q4T];<
conn.commit(); '.iUv#j4Sh
}catch(Exception e){ EgY]U1{
e.printStackTrace(); J^v_VZ3
} finally{ ?832#a?FZ;
try{ pS%Az)3RZ
if(ps!=null) { $exu}%
ps.clearParameters(); mz#(\p=T
ps.close(); hE=cgO`QU
ps=null; %pMW5]H
} xpV8_Gz;
}catch(SQLException e){} t Sg#2
DBUtils.closeConnection(conn); `S!`=26Z!
} EGs z{c[8@
} }{lOsZA
public long getLast(){ B82A:t)
return lastExecuteTime; FSM~Rl
} o6q Qzk
public void run(){ KAe)
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long now = System.currentTimeMillis(); 9A6ly9DIS
if ((now - lastExecuteTime) > executeSep) { }n<dyX:a
//System.out.print("lastExecuteTime:"+lastExecuteTime); "evLI?
//System.out.print(" now:"+now+"\n"); |6&"r&
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); sOHh&e
lastExecuteTime=now; %(NRH?
executeUpdate(); 6@T_1
} 2<y -cQ?>
else{ Yux7kD\c
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (s9?#t6
} S4|)N,#
} -F*j`
} 5B51^"
//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 &o?pZ(\C
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类写好了,下面是在JSP中如下调用。 5Zq- |"|
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<% J)R2O4OEd
CountBean cb=new CountBean(); LJBoS]~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 0S' EnmG
CountCache.add(cb); Qc3!FW<26
out.print(CountCache.list.size()+"<br>"); 0xPML}|V
CountControl c=new CountControl(); Db2G)63
c.run(); d>(dSKx
out.print(CountCache.list.size()+"<br>"); eo@:@O+bm
%>