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: s(W]>Ib
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CountBean.java Su99A. w
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/* ?yop#tjCbY
* CountData.java rf_(pp)
* fB+4mEG@
* Created on 2007年1月1日, 下午4:44 $8gj}0}eH
* x5_V5A/@LU
* To change this template, choose Tools | Options and locate the template under v0)I rO
* the Source Creation and Management node. Right-click the template and choose 7 sv
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* Open. You can then make changes to the template in the Source Editor. lB9 9J"A
*/ 5hwe ul>S
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package com.tot.count; vZ[wr@)
- Te+{
/** &@CcH_d*
* (27bNKr
* @author ZYr6Wn
*/ k^B<t'
public class CountBean { D+G?:mR
private String countType; 1sgI,5liUs
int countId; OKs1irt5
/** Creates a new instance of CountData */ U^iNOMs?
public CountBean() {} K*^3FO}JG
public void setCountType(String countTypes){ (D5 dN\
this.countType=countTypes; 8."B
} ha+)ZF
public void setCountId(int countIds){ D?ojxHe
this.countId=countIds; +VxzWNs*JP
} EM9K^l`
public String getCountType(){ wp7<0PP
return countType; [@YeQ{
} [w&B>z=g$
public int getCountId(){ .}
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return countId; *Ii_dpJ
} wWjZXsOd
} qzD<_ynA
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CountCache.java *HiN:30DZ
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/* D@@J7
* CountCache.java '/l<\b/E
* %0 cFs'
* Created on 2007年1月1日, 下午5:01 l*eJa38
* 3%gn:.9N
* To change this template, choose Tools | Options and locate the template under o~<ith$A*
* the Source Creation and Management node. Right-click the template and choose G`1!SEae
* Open. You can then make changes to the template in the Source Editor. ~jcdnm]
*/ M&au A
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package com.tot.count; H,8HGL[l
import java.util.*;
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/** 8SH&b8k<<
* B?A]0S
* @author +d/V^ <#
*/ H!N`hEEj>
public class CountCache { m5i?<Ko@
public static LinkedList list=new LinkedList(); YU>NGC]}d
/** Creates a new instance of CountCache */ KV&4Ep#
public CountCache() {} 7dxTyn=
public static void add(CountBean cb){ PydU.,^7
if(cb!=null){ D@.+B`bA
list.add(cb); ;W"=s79
} z)AZ:^!O
} LC8&},iu
} \N3A2L)l
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CountControl.java E~]37!,\\9
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/* ,%Go.3i[
* CountThread.java _=Y?' gHH
* Zw@=WW[Q`p
* Created on 2007年1月1日, 下午4:57 H5MO3DJ
* 2iX57-6Ub
* To change this template, choose Tools | Options and locate the template under 6l Suzu
* the Source Creation and Management node. Right-click the template and choose EhWYFQ
* Open. You can then make changes to the template in the Source Editor. pAdx 6
*/ Twq/Y07M
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package com.tot.count; /O`<?aP%
import tot.db.DBUtils; MgpjC`
import java.sql.*; $c^,TAN
/** Cpg>5N~;L
* pUV4oyGV
* @author Uw!N;QsC
*/ Pi/V3D)B
public class CountControl{ kH4xP3. i
private static long lastExecuteTime=0;//上次更新时间 W=-:<3XL
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 *WzvPl$e
/** Creates a new instance of CountThread */ @O]v.<8
public CountControl() {} "+dByaY
public synchronized void executeUpdate(){ -K%hug
Connection conn=null; 1iLrKA
PreparedStatement ps=null; >^!)G^B
try{ 6j2mr6o
conn = DBUtils.getConnection(); J?y0RX
conn.setAutoCommit(false); f3;.+hJ])
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); bz'#YM
for(int i=0;i<CountCache.list.size();i++){ *@+E82D
CountBean cb=(CountBean)CountCache.list.getFirst(); Z@1vJH6IbA
CountCache.list.removeFirst(); lEXER^6
ps.setInt(1, cb.getCountId()); Mp-hNO}.Z
ps.executeUpdate();⑴ Q0j4c
//ps.addBatch();⑵ Crg@05Z
} ,#V}qSKUS
//int [] counts = ps.executeBatch();⑶ 1#Q~aY
conn.commit(); @sPuc.
}catch(Exception e){ %M7EOa
e.printStackTrace(); U*Sjb%
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} finally{ r)]8zK4;=
try{ bI?uV;m>
if(ps!=null) { |~]@hs~
ps.clearParameters(); jA'7@/F/
ps.close(); tX.fbL@T
ps=null; +"?O2PX
} :P/0 "
}catch(SQLException e){} _Dq,\}
DBUtils.closeConnection(conn); Oaj$Z-
f
} ^l8&y;-T
} /:GeXDJw
public long getLast(){ jt?DogYx
return lastExecuteTime; bmP2nD6
} Ge_Gx*R
public void run(){ e8,!x9%J
long now = System.currentTimeMillis(); %=*nJvYS
if ((now - lastExecuteTime) > executeSep) { *]K/8MbiF
//System.out.print("lastExecuteTime:"+lastExecuteTime); Dkyw3*LCn%
//System.out.print(" now:"+now+"\n"); ~ TfN*0
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 8?4/
lastExecuteTime=now; -Cc2|~n
executeUpdate(); g3*J3I-O
} bAwFC2jO[
else{ 1e)5D& njS
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 9D`p2cO
} \$Q?
} vxZ :l
} }}X<e
//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 N@x5h8
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类写好了,下面是在JSP中如下调用。 /r?EY&9G
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<% WB|N)3-1
CountBean cb=new CountBean(); @.8FVF
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `gE_u
CountCache.add(cb); aB ^`3J
out.print(CountCache.list.size()+"<br>"); 2]'cj
CountControl c=new CountControl(); +Ua.\1"6
c.run(); a0)] W%F
out.print(CountCache.list.size()+"<br>"); LB\+*P6QM
%>