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$|d#ny
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CountBean.java !xg10N}I
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/* *[jq&
* CountData.java %bdBg
* _D+J3d(Pjk
* Created on 2007年1月1日, 下午4:44 DV({! [EP
* \|]+sQ WQ
* To change this template, choose Tools | Options and locate the template under :To{&T
* the Source Creation and Management node. Right-click the template and choose z}r
* Open. You can then make changes to the template in the Source Editor. z^/9YzA!6
*/ <O-R
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package com.tot.count; j,i)ecZ>
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/** Gp?pSI,b.t
* B'y)bY'_dS
* @author W^;4t3eQf
*/ gHXvmR"
public class CountBean { )*.rl
private String countType; G_k_qP^:
int countId; z-]ND
/** Creates a new instance of CountData */ hVZS6gU,x
public CountBean() {} I~ mu'T
public void setCountType(String countTypes){ nI73E
this.countType=countTypes; r4?|sAK
} Nd;pkssd
public void setCountId(int countIds){ ]_L;AD
this.countId=countIds; Q!AGalP z
} (A?w|/bZd
public String getCountType(){ 0}:Wh&g
return countType; )C0Iy.N-
} uXA}" f2
public int getCountId(){ S]e;p\8$Z
return countId; {8;}y[R
} B1Z;
} [ 'B u
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CountCache.java 1p-<F3;
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/* %82:?fq
* CountCache.java OwDwa~
* xj]^<oi<
* Created on 2007年1月1日, 下午5:01 Efpju(
* anKflt3
* To change this template, choose Tools | Options and locate the template under 3Zp q#
* the Source Creation and Management node. Right-click the template and choose \mt Y_O
* Open. You can then make changes to the template in the Source Editor. NUtKT~V
*/ O2lM;="
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package com.tot.count; OzTR#`oey
import java.util.*; ( pCU:'"
/** /Ea&Zm
* >V%.=})K
* @author +t]Ge
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*/ +}mj;3i
public class CountCache { (K ]wk9a
public static LinkedList list=new LinkedList(); zf\$T,t)
/** Creates a new instance of CountCache */ k$Ug;`v#
public CountCache() {} -<u_fv
public static void add(CountBean cb){ gEgd/Le
if(cb!=null){ 5RF*c,cNq
list.add(cb); BISH34
} U4iVI#f
} je%y9*V
} ?|Wxqo
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CountControl.java A=D
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/* vNm4xa%
* CountThread.java }h sR}
* m&MZn2u[4i
* Created on 2007年1月1日, 下午4:57 kFfNDM#D
* Q:ql~qew
* To change this template, choose Tools | Options and locate the template under }Os7[4RW
* the Source Creation and Management node. Right-click the template and choose @JJ{\?>
* Open. You can then make changes to the template in the Source Editor. $/E{3aT@F2
*/
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package com.tot.count; ,n UovWN07
import tot.db.DBUtils; Q[T)jo,j%
import java.sql.*; D~2n8h"2ye
/** Gy'/)}}Z
* |B2>}Y/
* @author =6qSo
@
*/ K@"B^f0mU
public class CountControl{ 83)m#
private static long lastExecuteTime=0;//上次更新时间 $?OQtz@
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 #zb6 7mg~
/** Creates a new instance of CountThread */ [E9_ZdBT
public CountControl() {} cNy*< Tv
public synchronized void executeUpdate(){ W$gjcsv
Connection conn=null; oRmA\R*
PreparedStatement ps=null; GIS,EwA
try{ _( QW2m?K
conn = DBUtils.getConnection(); #1'p?%K.
conn.setAutoCommit(false); ^*,?x
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J8&0l&~6
for(int i=0;i<CountCache.list.size();i++){ &~=d;llkT
CountBean cb=(CountBean)CountCache.list.getFirst(); ~UwqQD1p
CountCache.list.removeFirst(); }fhGofN$e
ps.setInt(1, cb.getCountId()); BMn`t@ !x
ps.executeUpdate();⑴ :p$Q3
//ps.addBatch();⑵ y
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} L*{E-m/
//int [] counts = ps.executeBatch();⑶ SU. $bsu
conn.commit(); s}4k^NGFJ
}catch(Exception e){ $o
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e.printStackTrace(); 0.U-
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} finally{ (J
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try{ E8aD[j[w
if(ps!=null) { ~x+&cA-0A2
ps.clearParameters(); Saks~m7,
ps.close(); B\~(:(OPM]
ps=null; QC1\Sn /
} 2FN# 63
}catch(SQLException e){} {C%f~j
DBUtils.closeConnection(conn); TO/SiOd
} mU>lm7'
} ]C-a[
public long getLast(){ -_>E8PhM
return lastExecuteTime; #V@vz#bo=
} fDChq[LAn
public void run(){ T>5N$i
long now = System.currentTimeMillis(); X09i+/ICK
if ((now - lastExecuteTime) > executeSep) { <4"Bb_U
//System.out.print("lastExecuteTime:"+lastExecuteTime); LiEDTXRz
//System.out.print(" now:"+now+"\n"); W;F=7[h
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); CI|#,^
lastExecuteTime=now; @3?dI@i(
executeUpdate(); =vb 'T
} "OrF81
else{ ?Elt;wL(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); yM? jiy
} 'pT8S
} c:-n0m'i
} V~QOl=`K:
//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 Z:VT%-
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类写好了,下面是在JSP中如下调用。 z'Ut9u
#*+$o<Q]9
<% 1L4v X
CountBean cb=new CountBean(); KP
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); S6{y%K2y&
CountCache.add(cb); )kE1g&
out.print(CountCache.list.size()+"<br>"); Tqx
CountControl c=new CountControl(); u/`
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c.run(); 8@KGc
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out.print(CountCache.list.size()+"<br>");
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