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: D0PP
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CountBean.java hC}A%_S
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/* ~! ]FF}6
* CountData.java J{$C}8V
* 8E/$nRfOd
* Created on 2007年1月1日, 下午4:44 [8Ub#<]]
* ~/[cZY@
* To change this template, choose Tools | Options and locate the template under po"M$4`9
* the Source Creation and Management node. Right-click the template and choose >0+m
* Open. You can then make changes to the template in the Source Editor. RrLQM!~
*/ 5<4njo?k
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package com.tot.count; E?z 3&C
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/** xN2M|E]
* M#})
* @author /'E+(Y&:J
*/ !`,6E`Y#
public class CountBean { c@
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private String countType; \WouTn
int countId; O<f_-n@G|
/** Creates a new instance of CountData */ JU<<,0
public CountBean() {} ix^:qw;
public void setCountType(String countTypes){ fJOU1%
this.countType=countTypes; u 8U>R=M
} WKBPqfC
public void setCountId(int countIds){ gU>Y
this.countId=countIds; a%ec: %
} i1vBg}WHN
public String getCountType(){ n5UcivyX
return countType; N&S:=x:$S
} 3w{4G<I
public int getCountId(){ 3-32q)8
return countId; &4"(bZ:LO
} Q(AOKp,F
} nP'ab_>b
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CountCache.java lZ^XZjwoM
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/* /c/!13|
* CountCache.java MnKEZ: 2
* nUmA
* Created on 2007年1月1日, 下午5:01 ErB6fl
* @[zPN[z.
* To change this template, choose Tools | Options and locate the template under /RmLV
* the Source Creation and Management node. Right-click the template and choose fLc<}DF
* Open. You can then make changes to the template in the Source Editor. bLu6|YB
*/ JS&l
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package com.tot.count; G7%Nwe~Y
import java.util.*; 0g]ABzTn
/** p`{<q
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* @author jc;&g)Rv
*/ !SiZA"
public class CountCache { ; {I{X}b
public static LinkedList list=new LinkedList(); rVQ:7\=Z
/** Creates a new instance of CountCache */ JEY%(UR8
public CountCache() {} sF_.9G)S0
public static void add(CountBean cb){ _}jj>+zA`
if(cb!=null){ Gpe h#Q4x
list.add(cb); yuFuYo&[?v
} ?ZlwRjB\
} mg'-]>$ $]
} 3zWY%(8t4?
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CountControl.java LdWeI
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/* w'M0Rd]
* CountThread.java 'r1&zw(
* |V!A!tB
* Created on 2007年1月1日, 下午4:57 @H&Aj..
* b^Rg_,s
* To change this template, choose Tools | Options and locate the template under %PlPXoG=
* the Source Creation and Management node. Right-click the template and choose .h~)|"uzW
* Open. You can then make changes to the template in the Source Editor. %<1fj#X8
*/ ]3
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package com.tot.count; nkN]z
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import tot.db.DBUtils; =5dv38
import java.sql.*; K<Yh'RvTD
/** \iowAo$
* woR((K] #G
* @author
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*/ RG*Nw6A
public class CountControl{ JEJ]'3
private static long lastExecuteTime=0;//上次更新时间 !S(jT?'w
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `mCcD
/** Creates a new instance of CountThread */ >Cd%tIie*
public CountControl() {} q;kMeE*
public synchronized void executeUpdate(){ u#J5M
Connection conn=null; *WMcE$w/D
PreparedStatement ps=null; >)#*}JI
try{ pk;bx2CP8
conn = DBUtils.getConnection(); 0"
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conn.setAutoCommit(false); ynP^|Ou
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); rX;(48Y
for(int i=0;i<CountCache.list.size();i++){ y0(k7D|\
CountBean cb=(CountBean)CountCache.list.getFirst(); d9Rj-e1x
CountCache.list.removeFirst(); c$uV8_ V
ps.setInt(1, cb.getCountId()); %K ]u"
ps.executeUpdate();⑴ <YJU?G:@
//ps.addBatch();⑵ IHxX:a/iv
} 5r
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//int [] counts = ps.executeBatch();⑶ X*S|aNaLWW
conn.commit(); C8&)-v|
}catch(Exception e){ !EpP-bq'*
e.printStackTrace(); Grjm9tbX}
} finally{ d8]6<\g
try{ 6"_FjS3Sl
if(ps!=null) { qx_+mCZ
ps.clearParameters(); vj{h*~
ps.close(); Ap}:^k5{
ps=null; p[Q
} *"9b?`E
}catch(SQLException e){} %gw0^^A
DBUtils.closeConnection(conn); NRoi`
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} {'d?vm!r
} deeOtco$LT
public long getLast(){ W4>8
return lastExecuteTime; 3$HFHUMQsk
} I[[rVts
public void run(){ "me Jn/
long now = System.currentTimeMillis(); GueqpEd2
if ((now - lastExecuteTime) > executeSep) { ,qvz:a
//System.out.print("lastExecuteTime:"+lastExecuteTime); IK%j+UB
//System.out.print(" now:"+now+"\n"); 5[/*UtB
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); _v2FXm
lastExecuteTime=now; ^vG*8,^S=8
executeUpdate(); R
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} BT#'<!7!
else{ xTAC&OCk^[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 7sLs+|<"
} ! *pK#
} o"UqI
} PkG+`N
//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 vaK$j!%FE
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类写好了,下面是在JSP中如下调用。 w
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<% FirmzB Il5
CountBean cb=new CountBean(); A E7>jkHB
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 2!" N9Adt
CountCache.add(cb); >mt<`s
out.print(CountCache.list.size()+"<br>"); eU{=x$o6S
CountControl c=new CountControl(); KtV_DjH:
c.run(); 3s>&h-E
out.print(CountCache.list.size()+"<br>"); r ."Dc
%>