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: aca=yDs2
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CountBean.java R~6$oeWAw
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/* ruy}/7uf
* CountData.java hzvd t
* `V04\05
* Created on 2007年1月1日, 下午4:44 >m$ 1+30X
* )h)]SF}
* To change this template, choose Tools | Options and locate the template under <q@a~'Ai?!
* the Source Creation and Management node. Right-click the template and choose 9_5ow
* Open. You can then make changes to the template in the Source Editor. |/)${*a4n
*/ :n-]>Q>5=k
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package com.tot.count; NN?`"Fww
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/** .~7FyLl$
* Kh_Lp$'0uM
* @author 2_Z ? #Y
*/ 3(,?S$>
public class CountBean { rQ qW_t%
private String countType; w {3<{
int countId; =aTv! 8</
/** Creates a new instance of CountData */ 1waTTT?"Ho
public CountBean() {} L}pt)w*V1j
public void setCountType(String countTypes){ W@I|Q -
this.countType=countTypes; Zo~
} @P?~KW6<|
public void setCountId(int countIds){ XY3v_5~/1F
this.countId=countIds; ZNvEW
} "9Q40w\
public String getCountType(){ ]%u@TK7
return countType; K42K!8$
} @W"KVPd
public int getCountId(){ z+n,uHs
return countId; ybKWOp:O
} lE(a%'36
} /x
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CountCache.java :BV6y|J9O^
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/* [UWdW
* CountCache.java 9j6QX~,
* )O@]uY
* Created on 2007年1月1日, 下午5:01 M# %a(Y3K)
* NdD`Hn-
* To change this template, choose Tools | Options and locate the template under z)r=+ -
* the Source Creation and Management node. Right-click the template and choose lUMS;H(
* Open. You can then make changes to the template in the Source Editor. fUA uqfj[
*/ 1`qMj0Y_
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package com.tot.count; 4p,EBn9(
import java.util.*; '|8} z4/g
/**
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* 3!|;iJRH
* @author 8&qZ0GLaT
*/ ?q{,R"
public class CountCache { LQRQA[^
public static LinkedList list=new LinkedList(); 7 *`h/
/** Creates a new instance of CountCache */ GQUe!G9
public CountCache() {} `3WFjU5a
public static void add(CountBean cb){ P"8~$ P#
if(cb!=null){ kr9*,E9cv
list.add(cb); %|q>pin2
} q%"VYt4
} st:`y=F_
} D!Pq4'd(
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CountControl.java _n50C"X=&(
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/* ?!d&E?9\
* CountThread.java E^/t$M|H
* 'O_3)x5
* Created on 2007年1月1日, 下午4:57 gf
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* B][U4WJ)
* To change this template, choose Tools | Options and locate the template under #(N+(():
* the Source Creation and Management node. Right-click the template and choose O
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* Open. You can then make changes to the template in the Source Editor. ':3pq2{
*/ {YAJBIvHV
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package com.tot.count; %u5L!W&
import tot.db.DBUtils; CFMo)"
import java.sql.*; nG'&ZjA
/** Rnr(g;2
* (mTE;s(
* @author ~O
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*/ 5A3xVN=
public class CountControl{ 26I_YL,S
private static long lastExecuteTime=0;//上次更新时间 W_\5nF
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 i%#+\F.&
/** Creates a new instance of CountThread */ [ 0KlC1=
public CountControl() {} UU;(rS/
public synchronized void executeUpdate(){ J\:R|KaP<p
Connection conn=null; "!ug_'VW
PreparedStatement ps=null; [6%VRqY
try{ ^cP!\E-^
conn = DBUtils.getConnection(); c4^ks&)'
conn.setAutoCommit(false); g"p%C:NN
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");
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for(int i=0;i<CountCache.list.size();i++){ i]YV {
CountBean cb=(CountBean)CountCache.list.getFirst(); p'*>vk
CountCache.list.removeFirst(); G\Cp7:j}
ps.setInt(1, cb.getCountId()); Eg#K.5hJ
ps.executeUpdate();⑴ wnEyl[ac
//ps.addBatch();⑵ 8pIP
} lm-dW'7&
//int [] counts = ps.executeBatch();⑶ P3x= 8_#
conn.commit(); '
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}catch(Exception e){ 'MUv5Th
e.printStackTrace(); 4ew"
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} finally{ bYpntV
try{ t^R][Ay&
if(ps!=null) { bnq;)>&
ps.clearParameters(); 2Mc3|T4)U
ps.close(); ODNM+#}`
ps=null; nYR#
} bpJ(XN}E
}catch(SQLException e){} ;g5m0l5
DBUtils.closeConnection(conn); Ln')QN
} t{^*6XOcJ
} |ef7bKU8
public long getLast(){ eTI%^d|
return lastExecuteTime; [!HEQ8 2g
} \r^qL^
public void run(){ }Gz~nf%
long now = System.currentTimeMillis(); B}Z63|/N
if ((now - lastExecuteTime) > executeSep) { A}G7l?V&
//System.out.print("lastExecuteTime:"+lastExecuteTime); dMf:h"7
//System.out.print(" now:"+now+"\n"); 8<S~Z:JK
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); lYVz3p
lastExecuteTime=now; dx5#\"KX=,
executeUpdate(); )t0$qd ]
} Vd,jlt.t
else{ ([\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0QXVW}`hz
} "}u.v?HYz
}
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} ]'!f28Ng-
//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 `#F{Waww'
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类写好了,下面是在JSP中如下调用。 vM*-D{
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<% DBW[{DE
CountBean cb=new CountBean(); WejYy|
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); w28o}$b`
CountCache.add(cb); A!s`[2 Z
out.print(CountCache.list.size()+"<br>"); jSh5!6O
CountControl c=new CountControl(); ddJQC|xR}
c.run(); >kj`7GA
out.print(CountCache.list.size()+"<br>"); qON|4+~u%
%>