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: #FwTV@
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CountBean.java }[O/u <Z
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/* '0tNo.8K
* CountData.java v*3tqT(%
* Pg%k>~i
* Created on 2007年1月1日, 下午4:44 i[r>^U8O
* J*zm*~8\
* To change this template, choose Tools | Options and locate the template under ig}H7U2q@
* the Source Creation and Management node. Right-click the template and choose U3rpmml
* Open. You can then make changes to the template in the Source Editor. e{k)]]J
*/ C?-_8OA
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package com.tot.count; !`S61~gE
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/** E!]d?t3b
* j#D (
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* @author zLS=>iLD{
*/ t}m"rMbt
public class CountBean { b[;Zl<
private String countType; >@+ r|
int countId; =+>^:3cCQ
/** Creates a new instance of CountData */ 34s>hm=0.
public CountBean() {} Z0!yTM/C
public void setCountType(String countTypes){ &:}}T=@M1
this.countType=countTypes; wU(N<9
} LPK[^
public void setCountId(int countIds){ E
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this.countId=countIds; c3X8Wi7m
} F2WMts
public String getCountType(){ p5?8E$VHV
return countType; {cMf_qQ
} 68YJ@(iS
public int getCountId(){ oaMh5FPy
return countId; %LZ-i?DL4Q
} yaW HGre
} wfY]J0l
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CountCache.java u.R
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/* DfX}^'#m+
* CountCache.java NUb:5tL
* ^eHf'^Cvvu
* Created on 2007年1月1日, 下午5:01 X0+M|8:
* ns;nle|m
* To change this template, choose Tools | Options and locate the template under [>xGynU0
* the Source Creation and Management node. Right-click the template and choose F%F :Gr/
* Open. You can then make changes to the template in the Source Editor. zbyJ5~
*/ VSQxlAGk@
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package com.tot.count; <h<4R Rj
import java.util.*; 1 6G/'Hb
/** WlfS|/\%V^
* zyF[I6Gs
* @author 8"2X 8C8
*/
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public class CountCache { o])2_e5
public static LinkedList list=new LinkedList(); dX>l"))yR
/** Creates a new instance of CountCache */ -4!i(^w[m/
public CountCache() {} o;<oXv
public static void add(CountBean cb){ L?~-<k
if(cb!=null){ ;zZGV4Qc~
list.add(cb); fsVQZ$h73
} r-SQk>Y}
} ' *x?8-K P
} ee5QZ,
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CountControl.java %U$PcHOo
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/* KXy|Si8w
* CountThread.java Tl ?]K
* Z-BPC|e
* Created on 2007年1月1日, 下午4:57 |Lz:i+;
* <^,5z!z}
* To change this template, choose Tools | Options and locate the template under 2n`OcXCh/
* the Source Creation and Management node. Right-click the template and choose MX.=k>
* Open. You can then make changes to the template in the Source Editor. 4lqowg0
*/ DTw3$:
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package com.tot.count; Q<F-l.q
import tot.db.DBUtils; jSyF]$"
import java.sql.*; RO1xcCp
/** 38hA guZX
* WV'FW)%
* @author jLEwFPz
*/ fGD#|a;,
public class CountControl{ h) .([
private static long lastExecuteTime=0;//上次更新时间 5YG?m{hyn_
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 =os%22*
/** Creates a new instance of CountThread */ {t;{={$
public CountControl() {} Ba],ONM4k
public synchronized void executeUpdate(){ `Al5(0Q
Connection conn=null; >|[74#}7
PreparedStatement ps=null; u}7#3JfLn
try{ uK`T1*_
conn = DBUtils.getConnection(); 4?AggqW
conn.setAutoCommit(false); x@I(G "
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 54 Baz
for(int i=0;i<CountCache.list.size();i++){ U0+Hk+
CountBean cb=(CountBean)CountCache.list.getFirst(); :(|;J<R%_
CountCache.list.removeFirst(); &.Jp,Xt)
ps.setInt(1, cb.getCountId()); W:7oGZ>4
ps.executeUpdate();⑴ 8W]6/st?]
//ps.addBatch();⑵ Z5 uetS^
} I]]3=?Y
//int [] counts = ps.executeBatch();⑶ \I@=EF- &
conn.commit(); 62&(+'$n
}catch(Exception e){ R^.oM1qu|
e.printStackTrace(); L//Z\xr|
} finally{ ?dukK3u
try{ }'mBqn
if(ps!=null) { n+M:0{Y|
ps.clearParameters(); /.<T^p@\&
ps.close(); ()Z! u%j
ps=null; cp0@wC#d
} 3hOiHO
;
}catch(SQLException e){} DHO6&8S
DBUtils.closeConnection(conn); 9=j"kXFf
} 2NLD7A
} ^G+1nY4?J
public long getLast(){ x?:[:Hf
return lastExecuteTime; }jM&GH1
} /#z5bo
public void run(){ ec:?Q0
long now = System.currentTimeMillis(); ISI\<qx
if ((now - lastExecuteTime) > executeSep) { iK$)Iy0
//System.out.print("lastExecuteTime:"+lastExecuteTime); ysV0Ed
//System.out.print(" now:"+now+"\n"); k[]B
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %X Jv;|
lastExecuteTime=now; zo-hH8J:
executeUpdate(); Bf$YwoZov
} Vf#X[$pc/
else{ W>Eee?
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); #YM5P
} [V ~(7U
} /R&!92I0*
}
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//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 0*MY4r|-
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类写好了,下面是在JSP中如下调用。 bwG2=
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<% 84UH&
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CountBean cb=new CountBean(); G};os+FxF
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); _\YBB=Os
CountCache.add(cb); 66*/"dBwm
out.print(CountCache.list.size()+"<br>"); 0b9;vlGq$
CountControl c=new CountControl(); PpD ?TAlA
c.run(); nc#}-}`5
out.print(CountCache.list.size()+"<br>"); s
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