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: R8|FqBs
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CountBean.java ]sqp^tQ`e
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/* b~?3HY:t~K
* CountData.java w ; PV
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* AQPzId*z
* Created on 2007年1月1日, 下午4:44 _@Y17L.
* LbnF8tj}h
* To change this template, choose Tools | Options and locate the template under fK{Z{)D
* the Source Creation and Management node. Right-click the template and choose ^AT#A<{1(
* Open. You can then make changes to the template in the Source Editor. 1#x@
*/ 0C717
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package com.tot.count; ^ lG^.
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/** scZ'/(b-E
* $oIGlKc:L
* @author iJk/fvi
*/ !6_tdZ
public class CountBean { *jl_,0g]
private String countType; !^3j9<|@'
int countId; Y|<1|wGG
/** Creates a new instance of CountData */ ROj=XM:+
public CountBean() {} J!:v`gb#@A
public void setCountType(String countTypes){ 2vW@d[<J
this.countType=countTypes; t`0(5v
} ^ |>)H
public void setCountId(int countIds){ wtQ (R4
this.countId=countIds; TZ:dY x
} `4"&_ltD
public String getCountType(){ d-"[-+)-
return countType; #Y>d@
} w*AXD!}
public int getCountId(){ 9z(h8H
return countId; m
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} tHo/Vly6Z
} (z'!'?v;
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CountCache.java 3M{b:|3/q
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/* SFa^$w
* CountCache.java jqy?Od)
* N-GQ\&
* Created on 2007年1月1日, 下午5:01 RH<C:!F^
* nb|"dK|
* To change this template, choose Tools | Options and locate the template under hN_,Vyf
* the Source Creation and Management node. Right-click the template and choose D 3}e{J8
* Open. You can then make changes to the template in the Source Editor. |Vc:o_n7
*/ u=6{P(5$j
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package com.tot.count; z(beT e
import java.util.*;
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/** EB>rY
* ?T:$:IHw
* @author O[#B906JB
*/ <*&2b
public class CountCache { cWL7gv\|
public static LinkedList list=new LinkedList(); {%z}CTf#
/** Creates a new instance of CountCache */ hH@pA:`s
public CountCache() {} +yu^Z*_
public static void add(CountBean cb){ |y7#D9m
if(cb!=null){ %LZf=`:(
list.add(cb); d:=:l?
} 2BIOA#@t
} veGRwir
} ]ipltR7k
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CountControl.java 9!|.b::
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/* L}%4YB
* CountThread.java Ci^tP~)&"
* $kk!NAW
* Created on 2007年1月1日, 下午4:57 W>]=0u4
* `'<&<P
* To change this template, choose Tools | Options and locate the template under (6\
H~
* the Source Creation and Management node. Right-click the template and choose |/AY!Y3
* Open. You can then make changes to the template in the Source Editor. }[I|oV5*+&
*/ ^<O:`c6_
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package com.tot.count; REwZ41
import tot.db.DBUtils; )*3sE1
import java.sql.*; VR_ bX|
/** jR&AQ-H&
* gL;tyf1P
* @author r` (U3EgP
*/ 18U
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public class CountControl{ O}_Z"y
private static long lastExecuteTime=0;//上次更新时间 >|So`C3:e
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 kzLtI w&.
/** Creates a new instance of CountThread */ %z:;t
public CountControl() {} [Lo}_v&
public synchronized void executeUpdate(){ rhe;j/ /`
Connection conn=null; c\pPwG
PreparedStatement ps=null; H@xIAL
try{ g:nU&-x#R
conn = DBUtils.getConnection(); G|Y9F|.!
conn.setAutoCommit(false); - '5OX/Szq
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /.aDQ>
for(int i=0;i<CountCache.list.size();i++){ &D~70N\L
CountBean cb=(CountBean)CountCache.list.getFirst(); ,*@6NK,.
CountCache.list.removeFirst(); <U]#722
ps.setInt(1, cb.getCountId()); ,M&[c|
ps.executeUpdate();⑴ tJ9i{TS
//ps.addBatch();⑵ r-a/vx#
} slKL(-D{
//int [] counts = ps.executeBatch();⑶ [bvI T]Z
conn.commit(); =j1rw
}catch(Exception e){ Zj8aD-1]U^
e.printStackTrace(); ul$YV9[\
} finally{ ,fwN_+5
try{ ?pv}~>
if(ps!=null) { DHV#PLbN$
ps.clearParameters(); T9+ ?A
l
ps.close(); +}@HtjM
ps=null; VJeN
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} cTeEND)
}catch(SQLException e){} It@ak6u?
DBUtils.closeConnection(conn); O2Mo ~}
} bu#}`/\_
} (U |[C*
public long getLast(){ UC34AKm
return lastExecuteTime; Py8<db%
} |0mVK`
public void run(){ X|7Y|0o
long now = System.currentTimeMillis(); 5E/z.5 q
if ((now - lastExecuteTime) > executeSep) { `MtPua\_
//System.out.print("lastExecuteTime:"+lastExecuteTime); O`hOVHDQ
//System.out.print(" now:"+now+"\n"); jo4*,B1x
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ` `A=p<W
lastExecuteTime=now; rsR0V+(W
executeUpdate(); !s]LWCX+|
} QMfa~TH#p
else{ [S/]Vk|4
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ]64mSB
} *_z5Pa`A
} NVMhbpX6
} Z?5kO-[
//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 \S@;>A<J
#is:6Z,OEU
类写好了,下面是在JSP中如下调用。 8uX1('+T*
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<% (Ia} ]q
CountBean cb=new CountBean(); iG*/m><-
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 1;[\xqJ
CountCache.add(cb); o~F @1
out.print(CountCache.list.size()+"<br>"); q@p-)+D;
CountControl c=new CountControl(); !\H!9FR
c.run(); _e=R[
out.print(CountCache.list.size()+"<br>"); tw]RH(g+#
%>