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: F5om-tzy
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CountBean.java Q)7L^
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/* y"%iD`{
* CountData.java kM}ic(K
* Z:r$;`K/
* Created on 2007年1月1日, 下午4:44 oqQ? 2k<@
* 3<Pyr-z h
* To change this template, choose Tools | Options and locate the template under bRY4yT
* the Source Creation and Management node. Right-click the template and choose ^+Y-=2u:
* Open. You can then make changes to the template in the Source Editor. .T
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*/ bHlD m~5
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package com.tot.count; A$$R_3ne
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/** JXD?a.vy^q
* $TH'"XK
* @author ,AFC 1t[0
*/ ~ L i%
public class CountBean { : Oz7R:
private String countType; Sj=69>m]5
int countId; ;^*+:e
/** Creates a new instance of CountData */ <LOx.}fv
public CountBean() {} d%[`=fs]|m
public void setCountType(String countTypes){ n+A'XBHk
this.countType=countTypes; !D|pbzQc8
} d~xU?)n)
public void setCountId(int countIds){ F"HI>t)>
this.countId=countIds; 0'`8HP
} iMY0xf8l
public String getCountType(){ u"
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return countType; +h9l%Pz
} +X|m>9
public int getCountId(){ Wvzzjcr(j
return countId; N4JqW
} Q,`2DHhK
} v1tN
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CountCache.java dp%pbn6w
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/* Z2pN<S{5
* CountCache.java \w@_(4")Qb
* Rs(CrB/M
* Created on 2007年1月1日, 下午5:01 |
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* ZE3ysLkm
* To change this template, choose Tools | Options and locate the template under yADN_
* the Source Creation and Management node. Right-click the template and choose (w@MlMk
* Open. You can then make changes to the template in the Source Editor. eL$U M
*/ Osvz 3UMY3
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package com.tot.count; ?H86Wbz
import java.util.*; E[htB><
/** IP4b[|ef
* H2p XJ/XF
* @author &s}@7htE
*/ %(7wZ0Z
public class CountCache { <:yq~?
public static LinkedList list=new LinkedList(); tX`[6`
/** Creates a new instance of CountCache */ ff5
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public CountCache() {} nluyEK
public static void add(CountBean cb){ 4\eX=~C>:
if(cb!=null){ :pF]TY"K.
list.add(cb); O]r3?=
} la"A$Tbu~
} EX_sJ c
} MnrGD>M@|
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CountControl.java D A)0Y_
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/* +]~w ?^h
* CountThread.java UC
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* pQ-^T.'
* Created on 2007年1月1日, 下午4:57 LK-6z w5=(
* oTV8rG
* To change this template, choose Tools | Options and locate the template under SAxa7B/U2
* the Source Creation and Management node. Right-click the template and choose #* /W!UOu
* Open. You can then make changes to the template in the Source Editor. g KmRjK
*/ `J7Lecgo
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package com.tot.count; ^@5ui;JV
import tot.db.DBUtils; uW--
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import java.sql.*; &)f++(i
/** /KvPiQ%
* "qP^uno
* @author P+%)0*W
*/ g!)LhE
public class CountControl{ Kac j
private static long lastExecuteTime=0;//上次更新时间 kpreTeA]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `6/Yf@b
/** Creates a new instance of CountThread */ jvQ+u L
public CountControl() {} pZJQKTCG
public synchronized void executeUpdate(){ C.e|VzQa
Connection conn=null; %LZM5Z^
PreparedStatement ps=null; D>#v 6XI
try{ iYQy#kO
conn = DBUtils.getConnection(); f;XsShxr
conn.setAutoCommit(false); \t(r@qq
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); f]6`GsE
for(int i=0;i<CountCache.list.size();i++){ [W|7r
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CountBean cb=(CountBean)CountCache.list.getFirst(); bz@=zLBt
CountCache.list.removeFirst(); 7'/2 :"
ps.setInt(1, cb.getCountId()); J]^gF|
ps.executeUpdate();⑴ A%8`zR
//ps.addBatch();⑵ uV$d7(N}"
} &*:)5F5
//int [] counts = ps.executeBatch();⑶ 7LZb*+>
conn.commit(); PdN\0B`
}catch(Exception e){ yc4f\0B/
e.printStackTrace(); y#Sw>-zRq
} finally{ V7'x?
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try{ r~!%w(N|M
if(ps!=null) { h
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ps.clearParameters(); KA{DN!
ps.close(); @DC2ci
>
ps=null; h|uP=0
} T( Gf~0HYF
}catch(SQLException e){} Iybpk?,M+
DBUtils.closeConnection(conn); nu%Nt"~[%
} e`2R{H
} -V_S4|>
public long getLast(){ F*( A; N_y
return lastExecuteTime; pC.4AkEO
} Py0i%pZ
public void run(){ <WKz,jh
long now = System.currentTimeMillis();
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if ((now - lastExecuteTime) > executeSep) { G`lhvpifG
//System.out.print("lastExecuteTime:"+lastExecuteTime); ^^Q32XC,
//System.out.print(" now:"+now+"\n"); e6xjlaKb
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
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lastExecuteTime=now; %f(.OR)6{
executeUpdate(); |oi49:NXn
} v6Wf7)d/1
else{ 9@*>$6
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0bL=l0N$W
} qa`(,iN
} ;|1P1H-W~M
} r_Yl/WW
//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 `a-T95IFy
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类写好了,下面是在JSP中如下调用。 $=SYssg7La
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<% "8TMAF|i4
CountBean cb=new CountBean(); a2_IF,p*?
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \~j(ui|
CountCache.add(cb); ]H'82a
out.print(CountCache.list.size()+"<br>"); *G|]5
CountControl c=new CountControl(); `ViNSr):J
c.run(); :>ST)Y@]w
out.print(CountCache.list.size()+"<br>"); wTbIS~!gF
%>