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: wd0 *"c@
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CountBean.java ew\ZF qA;
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/* wEMg~Hh
* CountData.java G5'HrV
* $C~OV@I
* Created on 2007年1月1日, 下午4:44 [+z*&~'
* rT{+ h}vO
* To change this template, choose Tools | Options and locate the template under [{cMEV&
* the Source Creation and Management node. Right-click the template and choose 2N[S*#~*e
* Open. You can then make changes to the template in the Source Editor. <ZgbmRY8
*/ P q)C(Z
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package com.tot.count; KI~M.2pk
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/** ecG,[1];
* .Pi8c[
* @author Y> f 6
*/ X!ad~bt
public class CountBean { 9_<>#)u5
private String countType; xix:=
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int countId; Fi_JF;
/** Creates a new instance of CountData */ '+*{u]\
public CountBean() {} 95^A !
public void setCountType(String countTypes){ ibIo1i//[
this.countType=countTypes; qZ|>{^a*
} |ZuS"'3_w
public void setCountId(int countIds){ f=/IwMpn
this.countId=countIds; j`pX2S
} o9#8q_D9
public String getCountType(){ u?+i5=N9{
return countType; v"N%w1`.e
} +ZK12D}
public int getCountId(){ 7lYiu fg
return countId; C!Oz'~l
} haW*W=kv)
} 9j~|m
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CountCache.java `$N()P
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/* c^s%t:)K
* CountCache.java k-N`
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* 8)
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* Created on 2007年1月1日, 下午5:01 sj& j\<(
* 3}lT"K
* To change this template, choose Tools | Options and locate the template under b6y/o48
* the Source Creation and Management node. Right-click the template and choose m/(f?M l
* Open. You can then make changes to the template in the Source Editor. O${B)C,
*/ ~M!s0jT
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package com.tot.count; /3mt=1/~{B
import java.util.*; Kk?C
/** h~R= ?%H[
* ;#jE??E/:
* @author +P5\N,,7R
*/ yRF
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public class CountCache { ;:5Ahfo \
public static LinkedList list=new LinkedList(); U&}v1wdZ3
/** Creates a new instance of CountCache */ #Z)8,N
public CountCache() {} rMy(NAo_
public static void add(CountBean cb){ 8pZGu8
if(cb!=null){ 7j22KQ|EX^
list.add(cb); [zv@}@$
} HJ]9e
} b|KlWt'
} :3aZ_
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CountControl.java -cL{9r&X
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/* (+w>hCI
* CountThread.java kl0|22"Gz
* I"5VkeIx
* Created on 2007年1月1日, 下午4:57
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* {/E_l
* To change this template, choose Tools | Options and locate the template under 94CHxv
* the Source Creation and Management node. Right-click the template and choose }S_#*N)i
* Open. You can then make changes to the template in the Source Editor. ^0fe:ac;
*/ N" =$S|Gs
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package com.tot.count; e_v_y$
import tot.db.DBUtils; !x@3U^${
import java.sql.*; _ \LPP_
/** ' ] $mt
* =(cfo_B@K
* @author Ak'=/`+ p
*/ u#^~([I
public class CountControl{ .FWi$B';
private static long lastExecuteTime=0;//上次更新时间 x3L0;:Fx8P
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 VTIRkC
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/** Creates a new instance of CountThread */ fUV;3du
public CountControl() {} MLk%U 4
public synchronized void executeUpdate(){ 'U/X<LCl
Connection conn=null; P3op1/Np
PreparedStatement ps=null; sG K7Uy
try{ N*NGC!p`N
conn = DBUtils.getConnection(); 3Q\k!$zq
conn.setAutoCommit(false); .;,` bH0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); eX3|<Bf
for(int i=0;i<CountCache.list.size();i++){ og)f?4
CountBean cb=(CountBean)CountCache.list.getFirst(); `\Ye:$q
CountCache.list.removeFirst(); W'3~vQF
ps.setInt(1, cb.getCountId()); u|EHe"V"
ps.executeUpdate();⑴ 7:$zSj#y
//ps.addBatch();⑵ FL?Ndy"I
} Wa!}$q+
//int [] counts = ps.executeBatch();⑶ Dxp.b$0t
conn.commit(); GX,)~Syw*
}catch(Exception e){ sMHP=2##
e.printStackTrace(); W)p?cK`
} finally{ rOA{8)jIa*
try{ sRaTRL2
if(ps!=null) { _<m yM2z
ps.clearParameters(); RM6*c
.
ps.close(); /P
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ps=null; %z"${ zw
} +5xk6RP
}catch(SQLException e){} r$<4_*
DBUtils.closeConnection(conn); w6<zPrA
} _4-UM2o;
} >^TcO
public long getLast(){ rPXy(d1<`S
return lastExecuteTime; [iGL~RiXtn
} pZV=Co3!I
public void run(){ }y&tF'qG
long now = System.currentTimeMillis(); <BX'Owbs!O
if ((now - lastExecuteTime) > executeSep) { &E0L 2gbI
//System.out.print("lastExecuteTime:"+lastExecuteTime); cTu"Tu\Qw
//System.out.print(" now:"+now+"\n"); 2e|m3
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); gvCQ![
lastExecuteTime=now; Un^3%=;
executeUpdate(); )=5,S~IT
} \SyG#.$
else{ 2kW*Z7@D
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); +(/' b'*
} 4"d'iY
} {jOV8SVL
} QUKv :;
//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 Mi:i1i
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类写好了,下面是在JSP中如下调用。 &at>sQ'
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<% v]c+|nRs
CountBean cb=new CountBean(); (Q F-=o
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); PS'SI X
CountCache.add(cb); \kEC|O)8
out.print(CountCache.list.size()+"<br>"); m,^UD{
CountControl c=new CountControl(); xV>sc;PEb
c.run(); +~\ 1g^h
out.print(CountCache.list.size()+"<br>");
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