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: L%fJH_$_s
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CountBean.java 9`5qVM1O{
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/* O],]\M{GL
* CountData.java 7-[^0qS
* U&L?IT=x
* Created on 2007年1月1日, 下午4:44 UE
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* @mu=7_$U
* To change this template, choose Tools | Options and locate the template under D]hwG0Chd
* the Source Creation and Management node. Right-click the template and choose ItwJL`
* Open. You can then make changes to the template in the Source Editor. )k&!&
*/ B/bS:
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package com.tot.count; ~jM!8]=
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/** Cm[^+.=I
* sU;aA0kz
* @author E(0 [/N~
*/ j/w*2+&v
public class CountBean { lU% L
private String countType; ]L9$JTGF`w
int countId; {KM5pK?,BJ
/** Creates a new instance of CountData */ 'L ]k\GO
public CountBean() {} H05U{vR
public void setCountType(String countTypes){ kUQdi%3yY;
this.countType=countTypes; NZt
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} 0uS6F8x@
public void setCountId(int countIds){ @ \JoICz
this.countId=countIds; gBJM|"_A?
} K)TMr"j\
public String getCountType(){ 8aa`0X/6
return countType; #H&`wMZZ:
} j4!oBSp
public int getCountId(){ k{.`=j
return countId; >kG: MJj
} zM++Z*
} Ap9 %5:]
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CountCache.java ec"+Il
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/* AOR(1Qyo
* CountCache.java p$zj2W+sN
* S '%!KGVe
* Created on 2007年1月1日, 下午5:01 R^tDL
* hT[w" &3
* To change this template, choose Tools | Options and locate the template under TW~9<c
* the Source Creation and Management node. Right-click the template and choose D|X@aUp8}
* Open. You can then make changes to the template in the Source Editor. (xlAS
*/
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package com.tot.count; _.K<#S
import java.util.*; i2m+s;
/** xGo,x+U*
* <ly.l]g
* @author [E4#|w
*/ qn#f:xltu
public class CountCache { Nt
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@
public static LinkedList list=new LinkedList(); FOD_m&+
/** Creates a new instance of CountCache */ ?;?$\b=
public CountCache() {} [Z{0|NR
public static void add(CountBean cb){ qo5WZ
be
if(cb!=null){ J G3#(DVc;
list.add(cb); \EOPlyf8x
} U+'h~P'4
} e$=0.GWT
} t+m
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CountControl.java zIh`Vw ,t0
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/* Y+e a
* CountThread.java FvV:$V|
* rT{+ h}vO
* Created on 2007年1月1日, 下午4:57 Z{spo=
* q8P$Md-=b1
* To change this template, choose Tools | Options and locate the template under =#sr4T
* the Source Creation and Management node. Right-click the template and choose Uh8c!CA8:\
* Open. You can then make changes to the template in the Source Editor. "[p-Iy1
*/ \1cJ?/$_Of
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package com.tot.count; {G(N vf,K]
import tot.db.DBUtils; LFT)_DG7(
import java.sql.*; ;PF!=8dW
/** KI~M.2pk
* n0<I
* @author K!BS?n;
*/ ,]qTJ`J
public class CountControl{ Gs)2HR@>
private static long lastExecuteTime=0;//上次更新时间 `]3A#y)v
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 mQy!*0y
/** Creates a new instance of CountThread */ Y> f 6
public CountControl() {} C6cEt5
public synchronized void executeUpdate(){ BaUcmF2Q
Connection conn=null; B|(M xR6m
PreparedStatement ps=null; cR"?EQ] `N
try{ wSd o7Lb
conn = DBUtils.getConnection(); QocR)aN=+
conn.setAutoCommit(false); Qg' {RAV8
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (2fWJ% 7VG
for(int i=0;i<CountCache.list.size();i++){ Rw#4 |&
CountBean cb=(CountBean)CountCache.list.getFirst(); Kzz]ZO*3
CountCache.list.removeFirst(); !e0~|8
ps.setInt(1, cb.getCountId()); ibIo1i//[
ps.executeUpdate();⑴ (!^; ar^
//ps.addBatch();⑵ AQa;D2B$
} hRKA,u/G
//int [] counts = ps.executeBatch();⑶ d1=fA%pJ
conn.commit(); WwBs_OMc
}catch(Exception e){ 'k?*?XxG
e.printStackTrace(); o9#8q_D9
} finally{ u AmDXqJ3
try{ BT8L 'qEj
if(ps!=null) { 8s#2Zv
ps.clearParameters(); ae`6hW2
ps.close(); M
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ps=null; A9L
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} F;;\I
}catch(SQLException e){} %an&lcoX
DBUtils.closeConnection(conn); N% W298
} 0281"aO
} c-gpO|4>
public long getLast(){ POtwT">z
return lastExecuteTime; (c=.?{U
} }:2GD0Ru
public void run(){ HbXYinG%
long now = System.currentTimeMillis(); p&|:,|jo5
if ((now - lastExecuteTime) > executeSep) { hxQx$
//System.out.print("lastExecuteTime:"+lastExecuteTime); JXA!l?%
//System.out.print(" now:"+now+"\n"); !<2%N3l
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Mp`2[S@$
lastExecuteTime=now; Wz]ny3K[.
executeUpdate(); 896oz>
} `;vJ\$-<
else{ u>W:SM
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |E#+X
} 1so9w89
} ;+-Dg3
} >GV= %
//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 yE4X6
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类写好了,下面是在JSP中如下调用。 >wOqV!0<
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<% OX!<{9o
CountBean cb=new CountBean(); vv%
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); c^ifHCt|
CountCache.add(cb); 9yt)9f
out.print(CountCache.list.size()+"<br>"); PBo;lg`
CountControl c=new CountControl(); qZz?i
c.run(); !9ytZR*
out.print(CountCache.list.size()+"<br>"); ub,GF?9
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