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: 76eF6N+%}t
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CountBean.java @aC9O9|~
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/* _L%
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* CountData.java
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* S>;+zVF]
* Created on 2007年1月1日, 下午4:44 4d63+iM+}
* ]9lR:V
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* To change this template, choose Tools | Options and locate the template under oXFo
* the Source Creation and Management node. Right-click the template and choose e pGC
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* Open. You can then make changes to the template in the Source Editor. IcJQC
*/ PdqyNn=
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package com.tot.count; vJ9IDc|[
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/** {JlSfJw!
* _@@.VmZL
* @author sIzy/W0iV
*/ wzf
public class CountBean { bR'UhPs-8;
private String countType; tRVz4fk[G
int countId; 3,^.
/** Creates a new instance of CountData */ d=eIsP'h
public CountBean() {} {wh, "Ok_
public void setCountType(String countTypes){ GQ\;f
this.countType=countTypes; gaWJzK
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} i)q8p
public void setCountId(int countIds){ *X\J[$!
this.countId=countIds; :6jh*,OHZl
} 3W3)%[ 5
public String getCountType(){ f-`C1|\w
return countType; uJSzz:\
} e]*@|e4b
public int getCountId(){ U(:Di]>{
return countId; 4`/Td?THx
} w&x$RP
} ^i!I0Q2yd
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CountCache.java L>&9+<-B
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/* yYiu69v
* CountCache.java *h
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* _)ZxD--Qg
* Created on 2007年1月1日, 下午5:01 5S
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* VQ8Q=!]
* To change this template, choose Tools | Options and locate the template under 9xOTR#B:_V
* the Source Creation and Management node. Right-click the template and choose Kh7C7[&
* Open. You can then make changes to the template in the Source Editor. R1~wzy
*/ \p#_D|s/Ep
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package com.tot.count; 3c+ps;nh
import java.util.*; Ya;y@44
/** QxT\_Nej*n
* oVQbc\P3
* @author vg8Yc
*/ heScIe
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public class CountCache { GL,( N|
public static LinkedList list=new LinkedList(); 6t4Khiwx
/** Creates a new instance of CountCache */ C."\ a_p
public CountCache() {} g\1|<jb3
public static void add(CountBean cb){ ?N=`}}Ky-
if(cb!=null){ :6J&%n
list.add(cb); R(f6uO!m
} Ch_eK^ g1
} RMHJI6?LB
} e2kW,JV/<$
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CountControl.java ej,R:}C%`
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/* -8yN6
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* CountThread.java (_=R<:
* {uurLEe?
* Created on 2007年1月1日, 下午4:57 `_SV1|=="8
* 8cGoo u6
* To change this template, choose Tools | Options and locate the template under .Bojb~zt
* the Source Creation and Management node. Right-click the template and choose 4"veq rC
* Open. You can then make changes to the template in the Source Editor. V[0
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*/ EMzJyGt7
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package com.tot.count; .Nk5W%7]=
import tot.db.DBUtils; 3_"tds <L
import java.sql.*; }/QtIY#I
/** LfN,aW
* 1#9PE(!2
* @author QUDpAW
*/ zUq(bD
public class CountControl{ :eIQF7-
private static long lastExecuteTime=0;//上次更新时间 9"zp>VR
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 .DM-&P
/** Creates a new instance of CountThread */ qRHT~ta-?
public CountControl() {} ueEf>0
public synchronized void executeUpdate(){ tX6_n%/L
Connection conn=null; 0U8'dYf
PreparedStatement ps=null; 5_1\{lP
try{ R'8S)'l
conn = DBUtils.getConnection(); BjGfUQ
conn.setAutoCommit(false); ^6J*:(eM
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ^SK!?M
for(int i=0;i<CountCache.list.size();i++){ b,X+*hRt
CountBean cb=(CountBean)CountCache.list.getFirst(); _l2_) ~
CountCache.list.removeFirst(); a#lytp
ps.setInt(1, cb.getCountId()); x_CY`Y
ps.executeUpdate();⑴ lOM8%{.'_x
//ps.addBatch();⑵ qWf[X'
} USaa#s4'
//int [] counts = ps.executeBatch();⑶ ) O&zb_{n
conn.commit(); q[9N4nj$<
}catch(Exception e){ ?Qx4Z3n
e.printStackTrace(); DP;:%L}
} finally{ j+e~
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try{ t+K1ArQc
if(ps!=null) { : ^U>n{
ps.clearParameters(); y06xl:iQwF
ps.close(); C_JO:$\rE
ps=null; Kv)}
} 5 D=r7
}catch(SQLException e){} -9;?k{{[T
DBUtils.closeConnection(conn); EM`'=<)V
} "$D'gSoYe
} ;&'r yYrex
public long getLast(){ .FV^hrJxI;
return lastExecuteTime; ^qi+Y)dU|
} 9hssIZO
public void run(){ sPVE_n
long now = System.currentTimeMillis(); ,SNt*t1"
if ((now - lastExecuteTime) > executeSep) { 3hxV`rb
//System.out.print("lastExecuteTime:"+lastExecuteTime); 6}VFob#h8
//System.out.print(" now:"+now+"\n"); XE&h&v=>
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9Ofls9]U
lastExecuteTime=now; aqWlX0+
executeUpdate(); yPY{ZADkQ
} g*`xEb='
else{ Q*M(d\V s
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); \w"~DuA
} *K|ah:(r1\
} BO7XN;
} JVxja<43
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 q"oNFHYPDs
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类写好了,下面是在JSP中如下调用。 ,p /{!BX
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<% z'Z[mrLq
CountBean cb=new CountBean(); :KR
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 8!HB$vdw7
CountCache.add(cb); ><>%;HZ
out.print(CountCache.list.size()+"<br>"); \ q3ui}-9
CountControl c=new CountControl(); *A4eYHn@
c.run(); "RM\<)IF
out.print(CountCache.list.size()+"<br>"); 7=5eLc^
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