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: F
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CountBean.java 4oW6&1
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/* IG@.W sM_
* CountData.java ( iM*Y"Y
* XBQ]A89G
* Created on 2007年1月1日, 下午4:44 gBM6{48GF
* uNnx
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* To change this template, choose Tools | Options and locate the template under L3[r7 b
* the Source Creation and Management node. Right-click the template and choose R
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* Open. You can then make changes to the template in the Source Editor. &w\E*$
*/ I2G4j/c=z
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package com.tot.count; LASR*
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/** >C,=elM
* QC@nRy8%
* @author u&MlWKCi
*/ /C)mx#h]
public class CountBean { Y rq-(
private String countType; u l[ edp_
int countId; AQX~do\A
/** Creates a new instance of CountData */ qMy>:,)Z
public CountBean() {} cRYnQ{$'
public void setCountType(String countTypes){ GFM$1}
this.countType=countTypes;
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} W 2/`O?
public void setCountId(int countIds){ c_$9z>$
this.countId=countIds; C1=7.dPr
} @0}Q"15,I
public String getCountType(){ ["4sCB@Tr
return countType; z'cVq}vl
} r9!jIkILz
public int getCountId(){ 9
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return countId; R5O{;/w
} y&8' V\
} Y:|_M3&'o
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CountCache.java bb<qnB
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/* 1J$sIY,Ou
* CountCache.java 1rs`|iX5
* O'tVZ!C#J
* Created on 2007年1月1日, 下午5:01 d=<"sHO
* ?UD2}D[M
* To change this template, choose Tools | Options and locate the template under 6=ukR=]v
* the Source Creation and Management node. Right-click the template and choose >uMj}<g#Z?
* Open. You can then make changes to the template in the Source Editor. )$18a
*/ &?~OV:r9
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package com.tot.count; q ld2<W
import java.util.*; Gb)!]:8
/** tqI]S
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* V&7jd7
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* @author 5AmYrXZ
*/ jKFypIZ4
public class CountCache { r!/=Iy@
public static LinkedList list=new LinkedList(); l2>ka~
/** Creates a new instance of CountCache */ kpc3l[.A
public CountCache() {} HJFt{tq2
public static void add(CountBean cb){ ?6h65GO{
if(cb!=null){ WzM9{c
list.add(cb); G2#={g{
} ~G0\57;h
} DP E NYr
} IyTL|W6
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CountControl.java \0&7^
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/* ^,@!L-<~(b
* CountThread.java dB{o-R
* {XC1B
* Created on 2007年1月1日, 下午4:57 3GEI) !
* y*ae 5=6(
* To change this template, choose Tools | Options and locate the template under LKtug>Me
* the Source Creation and Management node. Right-click the template and choose ,TrrqCw>
* Open. You can then make changes to the template in the Source Editor. dP8b\H
*/ _g+^ jR4
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package com.tot.count; L_f u<W
import tot.db.DBUtils; J23Tst#s
import java.sql.*; F
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/** 1r6>.&p
* Uj!3H]d
* @author W n*>h'R
*/ +5n,/YjS`
public class CountControl{ IooAXwOF
private static long lastExecuteTime=0;//上次更新时间 3*@ sp
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 j^DoILw
/** Creates a new instance of CountThread */ F+.:Ry FS
public CountControl() {} KPGo*mY
public synchronized void executeUpdate(){ <5qXC.{Cyp
Connection conn=null; fbF *C V
PreparedStatement ps=null; }UwDHq=
try{ asT*Z"/Q!
conn = DBUtils.getConnection(); plL##?<D<
conn.setAutoCommit(false); u&)+~X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); T7f>u}T
for(int i=0;i<CountCache.list.size();i++){ ICSi<V[y1
CountBean cb=(CountBean)CountCache.list.getFirst(); YGy.39@31
CountCache.list.removeFirst(); v-`RX;8
ps.setInt(1, cb.getCountId()); 8v&4eU'S
ps.executeUpdate();⑴ jYAD9v%
//ps.addBatch();⑵ 6FMW}*6<
} 56i9V9{2
//int [] counts = ps.executeBatch();⑶ fVCpG~&t
conn.commit(); Xo[={2_
}catch(Exception e){ ^l\U6$3
e.printStackTrace(); <0,c{e
} finally{ Zy0u@``
try{ r5ONAa3.
if(ps!=null) { G(7!3a+
ps.clearParameters(); 8BnI0l=\
ps.close(); N*.JQvbnr
ps=null; n[Jpy[4g
} <"I#lib
}catch(SQLException e){} VEAf,{)Q
DBUtils.closeConnection(conn); ur\v[k=
} -)%l{@Mr
} YEGRM$'`
public long getLast(){ m'h`%0Tc
return lastExecuteTime; gC-3ghmgS
} 6onFf* m!x
public void run(){ h+o-h4X
long now = System.currentTimeMillis(); s53Pw>f
if ((now - lastExecuteTime) > executeSep) { DyiyH%SSD
//System.out.print("lastExecuteTime:"+lastExecuteTime); CR$\$-
//System.out.print(" now:"+now+"\n"); Ps3wg=ni[
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); H.sHXuu
lastExecuteTime=now; 8r@_b
executeUpdate(); #Z8=z*4
} P qFK*^)s
else{ #QdBI{2
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )l}Gwd]h
} e 5hq>K
} Bny3j~*U
} ZTV|rzE
//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 uveby:dh
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类写好了,下面是在JSP中如下调用。 AS[yNCsjC
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<% W0GDn
CountBean cb=new CountBean(); z:B4
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Q/EHvb]
CountCache.add(cb); Dh=?Hzw
out.print(CountCache.list.size()+"<br>"); =FXO 1UZ!
CountControl c=new CountControl(); =b{wzx}e
c.run(); KiN8N=z
out.print(CountCache.list.size()+"<br>"); #.|efdsG
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