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: @9-z8PyF
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CountBean.java $9j\sZj&
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/* tJ i#bg%
* CountData.java b_:]Y<{> f
* m "h{HgJd
* Created on 2007年1月1日, 下午4:44 seB ^o}
* -y)ij``VY
* To change this template, choose Tools | Options and locate the template under }RDGk+x7|
* the Source Creation and Management node. Right-click the template and choose oxha8CF]D
* Open. You can then make changes to the template in the Source Editor. bBn4m:
*/ VE6
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package com.tot.count; VW}xY
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/** >PGW>W$
* 5O%Q*\(
* @author NDWpV
*/ nM>oG'm[n
public class CountBean { :]v%6i.
private String countType; pMe'fC~*
int countId; MOKg[j
/** Creates a new instance of CountData */ ~q5" '
public CountBean() {} c-(,%0G0
public void setCountType(String countTypes){ T'"aStt6
this.countType=countTypes; Np$pz
} d@<(Z7|
public void setCountId(int countIds){ 3Gubq4r
this.countId=countIds; T;IaVMFG|d
} q~48lxDU
public String getCountType(){ q]ER_]%Gna
return countType; ?k
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} D .oX>L#:
public int getCountId(){ ^y]CHr
return countId; PV<=wc^
} 1>r7s*
} 6-c3v
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CountCache.java 3&^4%S{/
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/* F#*vJb)
* CountCache.java *$1M=$
* %QCh#v=ks
* Created on 2007年1月1日, 下午5:01 @`^+XP K\
* 0&}
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* To change this template, choose Tools | Options and locate the template under wt0^R<28
* the Source Creation and Management node. Right-click the template and choose B"ZW.jMaI
* Open. You can then make changes to the template in the Source Editor. .DiH)
*/ 8*-8"It<"
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package com.tot.count; 7O^ySy"l
import java.util.*; mEyJ
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/** ]3uErnI
* Ne!F
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* @author mtSOygd
*/ d!mtSOh
public class CountCache { ms@*JCL!t
public static LinkedList list=new LinkedList(); [p^N].K$
/** Creates a new instance of CountCache */ X`JWYb4
public CountCache() {} MF)Xc\}0p
public static void add(CountBean cb){ UE3(L
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if(cb!=null){ r BQFC4L
list.add(cb); 7=(rk
} sEP-jEuwG
} fl #gWAM
} osPJ%I`^
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CountControl.java aw&:$twbM
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/* =NMT H[
* CountThread.java y!)
* Y&!M#7/'J3
* Created on 2007年1月1日, 下午4:57 , 7&`V=C
* ZG:#r\a
* To change this template, choose Tools | Options and locate the template under PY-
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* the Source Creation and Management node. Right-click the template and choose =
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* Open. You can then make changes to the template in the Source Editor. Q\|72NWS
*/ 2#:/C:
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package com.tot.count; ErIAS6HS'
import tot.db.DBUtils; |h$*z9bsf
import java.sql.*; KE! aa&g
/** qkVGa%^
* PLD6Ug
* @author G-
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*/ +aR.t@D+"Y
public class CountControl{ HI)MBrj;r
private static long lastExecuteTime=0;//上次更新时间 4+2XPaIm
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 03$-U0.;-
/** Creates a new instance of CountThread */ (7/fsfsF
public CountControl() {} 3NAU|//J
public synchronized void executeUpdate(){ _ZX"gHx
Connection conn=null; __o`+ ^FS
PreparedStatement ps=null; ]wFKXZeK
try{ H'7AIY}
conn = DBUtils.getConnection(); |W4
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conn.setAutoCommit(false); q_S`@2Dzz,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); S81Z\=eK
for(int i=0;i<CountCache.list.size();i++){ 2NHuZ.af
CountBean cb=(CountBean)CountCache.list.getFirst(); VtIPw&KHW
CountCache.list.removeFirst(); k]?M^jrm
ps.setInt(1, cb.getCountId()); tl9=u-D13@
ps.executeUpdate();⑴ ]k~Vh[[
//ps.addBatch();⑵ NsDJq{
} '?7th>pC
//int [] counts = ps.executeBatch();⑶ 9 f$S4O5
conn.commit(); 8fA9yQ8
}catch(Exception e){ oE@{h$=
e.printStackTrace(); DY1?37h
} finally{ v0hr ~1
try{ ;Yo9e~
if(ps!=null) { /^ *GoB
ps.clearParameters(); 3 d
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ps.close(); W _j`'WN/
ps=null;
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} 7oaa)
}catch(SQLException e){} !_0kn6S5
DBUtils.closeConnection(conn); LoZ8;VU
} Pl^-]~
} Y*nzOD$
public long getLast(){ *:
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