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: vj:hMPC
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CountBean.java 7v~\c%1V
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/* Jc#()4
* CountData.java Cl+TjmOV\`
* #VwA?$4g`
* Created on 2007年1月1日, 下午4:44 q;kN+NK64
* Wo^r#iRko
* To change this template, choose Tools | Options and locate the template under vG<JOxP
* the Source Creation and Management node. Right-click the template and choose >iCkvQ
* Open. You can then make changes to the template in the Source Editor. Qs*6wF
*/ M!s@w%0?'
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package com.tot.count; =lf&mD
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/** U*'
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* L|3wGY9E
* @author t:
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*/ "lp),
public class CountBean { fi[c^e+IX
private String countType; O_p:`h:;M
int countId; oR=^NEJv
/** Creates a new instance of CountData */ ;5P>R[p
public CountBean() {} fQ&:1ec
public void setCountType(String countTypes){ 3}H"(5dL}z
this.countType=countTypes; ve#cz2Z
} oJk$ +v6
public void setCountId(int countIds){ QrP$5H{[E
this.countId=countIds; 042sjt
} =9
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public String getCountType(){ *yv@-lP5s
return countType; S"iQQV{)Z
} vYD>m~Qc^
public int getCountId(){ {9<2{$Og
return countId; l.i"Z pik
} )y7SkH|
} "Q~6cH[#
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CountCache.java ua['rOnU
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/* {. N" 6P
* CountCache.java W"rX$D[Le
* 1GY[1M1^
* Created on 2007年1月1日, 下午5:01 {Y9m;b,X
* c
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* To change this template, choose Tools | Options and locate the template under =GQ?P*x|$
* the Source Creation and Management node. Right-click the template and choose j~G^J
* Open. You can then make changes to the template in the Source Editor. &/J[P dSb$
*/ [|2uu."$
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package com.tot.count; :5@cjj
import java.util.*; Y"mD)\Bw?
/** ]t|KFk!)
* B{W2D
* @author G{ rUqo
*/ `5`Pv'`
public class CountCache { #](k,% 2
public static LinkedList list=new LinkedList(); [?BmW{*u.
/** Creates a new instance of CountCache */ x#e(&OjN7
public CountCache() {} Nh41o0
public static void add(CountBean cb){ #3$U&|`
if(cb!=null){ HLAYmXX"w
list.add(cb); V9"Kro
} 0.nS306
} =MG
} )\uy 0+b
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CountControl.java ?T5^hQT
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/* >ofS'mp
* CountThread.java ..7"&-?g{4
* 1+o >#8D
* Created on 2007年1月1日, 下午4:57 "t8mQ;n
* Y,?
* To change this template, choose Tools | Options and locate the template under O#7fkL
* the Source Creation and Management node. Right-click the template and choose C["^%0lj
* Open. You can then make changes to the template in the Source Editor. B| %=<1?
*/ amGQ!$]
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package com.tot.count; C9Fc(Y?_
import tot.db.DBUtils; G#Z%jO-XN
import java.sql.*; /U)w:B+p/g
/** K4xZT+Qb
* ap\2={u^|
* @author g4d5G=y
*/ mCtuyGY
public class CountControl{ w"-bO ~5h
private static long lastExecuteTime=0;//上次更新时间 V/|Ln*rm
private static long executeSep=60000;//定义更新间隔时间,单位毫秒
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/** Creates a new instance of CountThread */ p7 !q#o
public CountControl() {} P-No;/!B#
public synchronized void executeUpdate(){ -z0,IYG }
Connection conn=null; [j}%&$
PreparedStatement ps=null; ~SZ0Yu:X
try{ &}w,bG$
conn = DBUtils.getConnection(); Q=gVxS
conn.setAutoCommit(false); {Y'DUt5j
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); RgQ\Cs24Q
for(int i=0;i<CountCache.list.size();i++){ Yq/|zTe{
CountBean cb=(CountBean)CountCache.list.getFirst(); /Os)4yH\
CountCache.list.removeFirst(); sXl7
ps.setInt(1, cb.getCountId()); 8pDJz_F!{
ps.executeUpdate();⑴ .'"+CKD.N
//ps.addBatch();⑵ ^F`FB..:y
} 4ej$)AdW3
//int [] counts = ps.executeBatch();⑶ r7*[k[^[^
conn.commit(); ~srmlBi6
}catch(Exception e){ 7z=Ss'O]
e.printStackTrace(); u[ s+YGS
} finally{ \{G6!dV|S
try{ ^gky i/z
if(ps!=null) { 5.VA1
ps.clearParameters(); 7=T0Sa*;
ps.close(); 1y_{#,{>
ps=null; uzZ|w+3O
} /Rk5n
}catch(SQLException e){} 3Luv$6
DBUtils.closeConnection(conn); :":W(O
} ]$nJn+85@b
} s&y
public long getLast(){ &J"a` l2
return lastExecuteTime; %)l2dK&9"j
} N~M:+\
public void run(){ &.7\{q\(
long now = System.currentTimeMillis(); ?b8NEVjw
if ((now - lastExecuteTime) > executeSep) { 15U=2j*.b
//System.out.print("lastExecuteTime:"+lastExecuteTime); =q5A@!D
//System.out.print(" now:"+now+"\n"); G!OD7:
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); w^`n
lastExecuteTime=now; +#Ov9b
executeUpdate(); )_.@M '?
} h{<^?=
else{ |EU}&