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: ,dd1/zm
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CountBean.java 'PrBa[%
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/* h}tC+_"D
* CountData.java @[v,q_^8
* R:l &2
* Created on 2007年1月1日, 下午4:44 \(`2 @
* Y9-F\t=~
* To change this template, choose Tools | Options and locate the template under e1b?TF@lz
* the Source Creation and Management node. Right-click the template and choose Q e/XEW
* Open. You can then make changes to the template in the Source Editor. +P9eE,WR
*/ r(>812^\
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package com.tot.count; o/&K>]8M
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/** Txl|F\nK`
* ;Y8>?
* @author #I MaN%
*/ \)6AzCq
public class CountBean { [CI0N
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private String countType; h=6D=6c
int countId; |bQF.n_
/** Creates a new instance of CountData */ a~R.">>$
public CountBean() {} Q(Yn8t
public void setCountType(String countTypes){ cDYOJu.
this.countType=countTypes; ]Ar,HaX-
} RnC+]J+?4
public void setCountId(int countIds){ GJ`._ju
this.countId=countIds; -Ju;i<
} ukVBC"Ny
public String getCountType(){ ue?3;BF 5
return countType; a>-qHX-l
} Z0v?3v}9^
public int getCountId(){ ]1zud
return countId; #l`\'0`.
} 30SQ&j[N]
} ~K5A$s2
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CountCache.java KT 6ppo
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/* bLGC
* CountCache.java 1he5Zevm}
* $!$If(
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* Created on 2007年1月1日, 下午5:01 o7Z8O,;
* 2yFT` 5+H4
* To change this template, choose Tools | Options and locate the template under _E8Cvaob
* the Source Creation and Management node. Right-click the template and choose :.=j)ljTx
* Open. You can then make changes to the template in the Source Editor. eU`O=uE
*/ f.%3G+
+Q"~2_q5/;
package com.tot.count; $;$vcV9*
import java.util.*; jAcKSx$}y"
/** Tb;,t=;u
* 1M_Vhs^
* @author liy/uZ
*/ .v}|Tp&k
public class CountCache { {jwLVKT$
public static LinkedList list=new LinkedList(); Zv@
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/** Creates a new instance of CountCache */ N5`z S79W
public CountCache() {} ?F!c"+C
public static void add(CountBean cb){ &w`DF,k|
if(cb!=null){ 4M]l~9;A
list.add(cb); ZNDi;6e
} m]}U!XT
} =vQ J2Rg
} j+3rS
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CountControl.java :x5O1Zn/t
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/* IC8%E3
* CountThread.java ,~1sZ`C
* yZm=#.f
* Created on 2007年1月1日, 下午4:57 5}w
* -I6t ^$HA
* To change this template, choose Tools | Options and locate the template under Og@{6>
* the Source Creation and Management node. Right-click the template and choose $`%Om WW{
* Open. You can then make changes to the template in the Source Editor. JKrS;J^97v
*/ ~b
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package com.tot.count; yH43Yo#Rk
import tot.db.DBUtils; @TXLg2
import java.sql.*; Ac*J;fI
/** ~Ma r
* .m\0<8C
* @author Wb cm1I)
*/ <Uj9~yVN]
public class CountControl{ {J/Fp#
private static long lastExecuteTime=0;//上次更新时间 b5Q>e%i#
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 /NiD#s0t
/** Creates a new instance of CountThread */ -])=\n!=
public CountControl() {} |6^%_kO!|
public synchronized void executeUpdate(){ 75>Ok /
Connection conn=null; .L"IG=Uh#
PreparedStatement ps=null; -r3
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try{ u3,O)[qV
conn = DBUtils.getConnection(); Uey'c1
conn.setAutoCommit(false); ]e7?l/N[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); e3p:lu
for(int i=0;i<CountCache.list.size();i++){ E]m?R 4
CountBean cb=(CountBean)CountCache.list.getFirst(); aHYISjZ]>
CountCache.list.removeFirst(); -/Wf iE
ps.setInt(1, cb.getCountId()); nSBhz
ps.executeUpdate();⑴ `]@=Hx(
//ps.addBatch();⑵ 6@8z3JW.A
} U~"Y8g#qgy
//int [] counts = ps.executeBatch();⑶ ,=[%#gS
conn.commit(); FY^Nn
}catch(Exception e){ |S|'o*u
e.printStackTrace(); <Q- m &
} finally{ ;y1/b(t
try{ yf8kBT:&S
if(ps!=null) { "8cI]~V
ps.clearParameters(); &|RTLGwX
ps.close(); {i8zM6eC
ps=null; ~7*2Jp'
} ZE_
}catch(SQLException e){} hLk6Hqr7
DBUtils.closeConnection(conn); %OO}0OW
} mb1c9
} V?wV*]c
public long getLast(){ *W^ZXhrZ
return lastExecuteTime; r;[ =y<Yf
} +DR$ >a
public void run(){ =Tl_~OR
long now = System.currentTimeMillis(); t8xXGWk0
if ((now - lastExecuteTime) > executeSep) { .PR+_a-X
//System.out.print("lastExecuteTime:"+lastExecuteTime); {]dtA&8(
//System.out.print(" now:"+now+"\n"); 7 [u>#8
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 2u!&Te(!9
lastExecuteTime=now; $of2 lA
executeUpdate(); gM=:80
} m9i/rK_
else{ qnj'*]ysBC
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |rZMcl/
} LfFXYX^
} $YcB=l
} w(
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 SUUN_w~
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类写好了,下面是在JSP中如下调用。 ?7LvJ8
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<% : N$-SV
CountBean cb=new CountBean(); r-.@MbBm
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); h"0)spF"d
CountCache.add(cb); u5glKE
out.print(CountCache.list.size()+"<br>"); h !R=t
CountControl c=new CountControl(); ArNQ}F/
c.run(); "2sk1
out.print(CountCache.list.size()+"<br>"); N8#j|yf
%>