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: vr4{|5M
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CountBean.java ko"xR%Q
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/* ]IH1_?HgP7
* CountData.java 5|Oj\L{
* ~Rw][Ys
* Created on 2007年1月1日, 下午4:44 \46*4?pP
* [WI'oy
* To change this template, choose Tools | Options and locate the template under |>b;M,`OO
* the Source Creation and Management node. Right-click the template and choose @U:PXCvh
* Open. You can then make changes to the template in the Source Editor. G +AP."M?
*/ a7aj:.wi
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package com.tot.count; T(Ji%S>
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/** _k#GjAPM
* rdsZ[ii
* @author VAA="yN
*/
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public class CountBean { TW}].A_-
private String countType; qMw_`dC
int countId; S0ltj8t
/** Creates a new instance of CountData */ 6{I6'+K~
public CountBean() {} ;U#=H9_
public void setCountType(String countTypes){ ^oR
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this.countType=countTypes; 4'td6F
} &Zjs
public void setCountId(int countIds){ 'K\H$<CJ
this.countId=countIds; g_rk_4]
} (\nEU! Y
public String getCountType(){ OIkjO}/7
return countType; K"ly\$F
} @>&b&uj7T
public int getCountId(){ x~F YG
return countId; 7a=ul:
} O:ACp<@
} "{kE#`c6<n
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CountCache.java pu_?)U
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/* cj[x%eK>
* CountCache.java NKTy!zWh
* w`v`aw]
* Created on 2007年1月1日, 下午5:01 lbPn<
* "&o"6ra}
* To change this template, choose Tools | Options and locate the template under dnV&U%fO
* the Source Creation and Management node. Right-click the template and choose pfw`<*e'
* Open. You can then make changes to the template in the Source Editor. f:6F5G
*/ FjMKb
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package com.tot.count; Qg0%rbE
import java.util.*; =uEpeL~d;+
/** F'CJN$6Mw/
* YW"uC\kg|
* @author /%gMzF
*/ 4iZg2"[D
public class CountCache { ]68FGH
public static LinkedList list=new LinkedList(); PHJHW#sv
/** Creates a new instance of CountCache */ )l/
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public CountCache() {} ].2t7{64
public static void add(CountBean cb){ k7j[tB#
if(cb!=null){ 3177 R>0
list.add(cb); 947;6a%$
} ~gHn>]S0
} pjQyN|KS
} 9XKqsvdS
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CountControl.java i7cUp3
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/* s
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* CountThread.java |MagK$o
* 7WY~v2SDF
* Created on 2007年1月1日, 下午4:57 `)4v Q+A>
* t0r0{:
* To change this template, choose Tools | Options and locate the template under pzaU'y#PM
* the Source Creation and Management node. Right-click the template and choose iX<" \pV
* Open. You can then make changes to the template in the Source Editor. '.<c[Mp
*/ !^s -~`'\~
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package com.tot.count; X6_
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import tot.db.DBUtils; ofw&?Sk0
import java.sql.*; lpS v
/** t\'MB
* *SIYZE'
* @author >B=s+}/ME
*/ [\Nmm4
public class CountControl{ ZJc{P5a1J
private static long lastExecuteTime=0;//上次更新时间 r :$*pC&{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 m#i4_F=^b
/** Creates a new instance of CountThread */ e|5@7~Vi
public CountControl() {} |yz
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public synchronized void executeUpdate(){ -iY-rzW
Connection conn=null; `#wEa'v6
PreparedStatement ps=null; q @O
try{ s6Dkh}:d
conn = DBUtils.getConnection(); V5i}^%QSs
conn.setAutoCommit(false); kFY2VPP~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); fR~0Fy Gp
for(int i=0;i<CountCache.list.size();i++){ |K;9b-\
CountBean cb=(CountBean)CountCache.list.getFirst(); IR$d?\O3
CountCache.list.removeFirst(); N)Q.P'`N
ps.setInt(1, cb.getCountId()); g5"I{ol5T~
ps.executeUpdate();⑴ /#SfgcDt
//ps.addBatch();⑵ 6({)O1Z
} "Nb2[R
//int [] counts = ps.executeBatch();⑶ g/ShC8@=u
conn.commit(); 8y
}catch(Exception e){ oU @!R
e.printStackTrace(); <|.]$QSi
} finally{ tm1&OY
try{ F?"Gln~;
if(ps!=null) { 2boyBz}=S
ps.clearParameters(); K3`!0(
ps.close(); SZLugyZ2Y
ps=null; @: =vK?8L
} maY.Z<lN
}catch(SQLException e){} KK1?!7
DBUtils.closeConnection(conn); q
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} Lu:*nJ%1[
} bZ:+q1
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public long getLast(){ Ok@`<6v
return lastExecuteTime; ~av#r=x
} 9`
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public void run(){ ks6iy}f7
long now = System.currentTimeMillis(); %72(gR2Wa2
if ((now - lastExecuteTime) > executeSep) { M%Rr=
//System.out.print("lastExecuteTime:"+lastExecuteTime); <2%9O;bV[
//System.out.print(" now:"+now+"\n"); ~Ey+
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); >B~?
}@^Gk
lastExecuteTime=now; [>pBz3fn,
executeUpdate(); lF.kAEC
} @mxaZ5Vv}
else{ rC!"<