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: OLPY<ax
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CountBean.java ]=VRct
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/* PWZd<
* CountData.java .dMdb7
* UOsK(mB
* Created on 2007年1月1日, 下午4:44 4d%0a%Z
* PxgJ7d
* To change this template, choose Tools | Options and locate the template under )l$}plT4
* the Source Creation and Management node. Right-click the template and choose x&*f5Y9hCi
* Open. You can then make changes to the template in the Source Editor. zBlv?JwG
*/ =/_u k{
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package com.tot.count; 5?F5xiW
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/** u -P !2vT
* nX 9]dz
* @author );%H;X+x
*/ z4:<?K
public class CountBean { `:Gzjngc
private String countType; oWL_Hh%-f`
int countId; =$Mf:F@
/** Creates a new instance of CountData */ Hc=QSP
public CountBean() {} C&>*~
public void setCountType(String countTypes){ |bz%SB
this.countType=countTypes; R?O)vLmd
} @U18Dj[
public void setCountId(int countIds){ 3q}j"x?
this.countId=countIds; z,4mg6gt
} iW^J>aKy
public String getCountType(){ hK{H7Ey*
return countType; fE+zA)KX
} VJqk0w+
public int getCountId(){ =K18| Q0m
return countId; GM0Q@`d
} q50F!yHC-
} IGcq*mR=
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CountCache.java /W$i8g
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/* GeTk/tU
* CountCache.java *u1q7JFQk
* )Q'E^[Ua
* Created on 2007年1月1日, 下午5:01 lb.Q^TghU
* Z-Qp9G'
* To change this template, choose Tools | Options and locate the template under ^~;ia7V&2
* the Source Creation and Management node. Right-click the template and choose )&c#?wx'w
* Open. You can then make changes to the template in the Source Editor. h<U?WtWT-p
*/ X`KSj
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package com.tot.count; ]a4U\yr
import java.util.*; JP5e=Z<
/** l,7&
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* Z5>~l
* @author &rBe -52
*/ -!Myw&*\V
public class CountCache { s2{SbOBis
public static LinkedList list=new LinkedList(); g[O?wH-a
/** Creates a new instance of CountCache */ fz=?QEG
public CountCache() {} +:.Jl:fx4
public static void add(CountBean cb){ 172 G
if(cb!=null){ Or5?Gt
list.add(cb); X ha9x,
} I "AjYv4R
} D=-}&w_T"
} v.Ba
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CountControl.java {R!yw`#^B
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/* ma~#E$i&
* CountThread.java \b"rf697,
* a/j;1xcc<
* Created on 2007年1月1日, 下午4:57 F3}MM
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* {h?pvH_>
* To change this template, choose Tools | Options and locate the template under &J6`Q<U!
* the Source Creation and Management node. Right-click the template and choose N&NBn(
* Open. You can then make changes to the template in the Source Editor. }`B
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*/ _]`7et\=
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package com.tot.count; fY!?rZ)$
import tot.db.DBUtils; X_TjJmc
import java.sql.*; 0SIC=p=J
/** 2!^=G=H/
* ! I@w3`
* @author KS$t
*/ _6NUtU
public class CountControl{ K3?5bT_{
private static long lastExecuteTime=0;//上次更新时间 gF{ehU%
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 v|%41xOsr
/** Creates a new instance of CountThread */
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public CountControl() {} !%G]~
public synchronized void executeUpdate(){ 7Jf~Bn
Connection conn=null; j,M$l mR')
PreparedStatement ps=null; %e E^Y<@g
try{ |h]V9=
conn = DBUtils.getConnection(); fg^25g'_
conn.setAutoCommit(false); ZRagM'K
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); n%&L&G
for(int i=0;i<CountCache.list.size();i++){ y&NqVR=
CountBean cb=(CountBean)CountCache.list.getFirst(); M~taZt4
CountCache.list.removeFirst(); /t0L%jJZ
ps.setInt(1, cb.getCountId()); j<t3bM-G
ps.executeUpdate();⑴ : ,l7e
//ps.addBatch();⑵ a: "1LnvR
} SyvoN,;Q
//int [] counts = ps.executeBatch();⑶ PM\Ju]
conn.commit(); 0|P=S|%~
}catch(Exception e){ FU3K?A
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e.printStackTrace(); .k,j64
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} finally{ c{MoeIG)v@
try{ V?u#WJy/
if(ps!=null) { d &#_t@%
ps.clearParameters(); v~nKO?{
ps.close(); E\[B E<y
ps=null; 3oCI1>k
} 68tyWd}
}catch(SQLException e){} 4D?h}U /
DBUtils.closeConnection(conn); g3tE.!a5-
} w]wZJ/U`
} {"ST
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public long getLast(){ )eyzHB,H
return lastExecuteTime; yLa@27T\A
} Y
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public void run(){ L/8oqO|
long now = System.currentTimeMillis(); *()['c#CC
if ((now - lastExecuteTime) > executeSep) { k~>(XG[x&
//System.out.print("lastExecuteTime:"+lastExecuteTime); C%o|}i v"
//System.out.print(" now:"+now+"\n"); mU/o%|h
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); *g(d}C!
lastExecuteTime=now; s@\3|e5g
executeUpdate(); >. |({;n9
} ?:;;0kSk
else{ b RR N
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); l/N<'T_G
} *S;}&VAZ
} 7>yd
} +A3/^C0
//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 $J7V]c*-b
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类写好了,下面是在JSP中如下调用。 mfraw2H
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<% l9.`2d]o
CountBean cb=new CountBean(); k~tEUsv
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 4Q|>k)H
CountCache.add(cb); LqWiw24#
out.print(CountCache.list.size()+"<br>"); E|@C:ghG
CountControl c=new CountControl(); 4S_f2P2J
c.run(); S2$E`'
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out.print(CountCache.list.size()+"<br>"); qed_ PsI
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