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: %}t<,ex(yO
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CountBean.java N$Pi4
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/* B.zRDB}i=
* CountData.java #bFJ6;g=V
* I/whpOg
* Created on 2007年1月1日, 下午4:44 yJ(BPSt
* >U.)?>G/dt
* To change this template, choose Tools | Options and locate the template under g>])O
* the Source Creation and Management node. Right-click the template and choose Vl91I+Ev
* Open. You can then make changes to the template in the Source Editor. qu}`;\9@ld
*/ ROWb:tX}
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package com.tot.count; $UgQ1Qc
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/** RR*eq.;
* @-uV6X8|
* @author sbWen?
*/ BvXA9YQ3
public class CountBean { |AY`OVgcKD
private String countType; C26vH#C
int countId; NGA8JV/U
/** Creates a new instance of CountData */ }sbh|#
public CountBean() {} V$D+Joj
public void setCountType(String countTypes){ mM6g-)cV
this.countType=countTypes; =Gka;,n
} -pWnO9q
public void setCountId(int countIds){ (e:@7W)L
this.countId=countIds; 7=$@bHEF#*
} ?*2DR:o>@
public String getCountType(){ v' x)AbbC
return countType; ^lF'KW$
} s7x&x;-
public int getCountId(){ 8M{-RlR
return countId; [2]Ti_
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} IK:F~I
} u@(z(P
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CountCache.java (MI8Kkb1d
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/* 6 WD(
* CountCache.java %Tc P[<
* Td7f
* Created on 2007年1月1日, 下午5:01 [M:ag_rm+f
* Z0Tpz2m
* To change this template, choose Tools | Options and locate the template under m)5,ut/
* the Source Creation and Management node. Right-click the template and choose KW3Dr`A
* Open. You can then make changes to the template in the Source Editor. 3LxhQVx2
*/ JG]67v{F
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package com.tot.count; a>3#z2#
import java.util.*; O
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/** #84<aM
* F&ud|X=m
* @author -r.Qy(}p
*/ .7h:/d
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public class CountCache { &#keI.,
public static LinkedList list=new LinkedList(); j|Q*L<J
/** Creates a new instance of CountCache */ aFCma2
public CountCache() {} @
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public static void add(CountBean cb){ xJ2DkZ
if(cb!=null){ +#||
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list.add(cb); oWJ0>)
} ,Z2fVz~9
} aan)yP
} O{4G'CgN(
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CountControl.java **oaR
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/* Ukf4Q\@w
* CountThread.java X?2ub/Nr#Y
* qy]tuKZI
* Created on 2007年1月1日, 下午4:57 %OI4}!z@l
* !$q *~F"S
* To change this template, choose Tools | Options and locate the template under cO&(&*J r
* the Source Creation and Management node. Right-click the template and choose XZ|%9#6
* Open. You can then make changes to the template in the Source Editor. *wSz2o),
*/ \yQs[l%J
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package com.tot.count; 5:oteNc3
import tot.db.DBUtils; cph&\
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import java.sql.*; +,"O#`sy<
/** S:.Vt&+NJ
* <)f1skJsP
* @author bgi
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*/ 6RA4@bIG
public class CountControl{ Ys+2/>!
private static long lastExecuteTime=0;//上次更新时间 u$vA9g4
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 RM5$O+"
/** Creates a new instance of CountThread */ IB'gY0*
public CountControl() {} |a>W9Y m
public synchronized void executeUpdate(){ g>@T5&1q*
Connection conn=null; O]|T !
PreparedStatement ps=null; _m;H$N~I#
try{ W8@o7svrh
conn = DBUtils.getConnection(); M%U1?^j8
conn.setAutoCommit(false); +2qCH^80
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++){ E`M, n,
CountBean cb=(CountBean)CountCache.list.getFirst(); n`W7g@Sg#I
CountCache.list.removeFirst(); C0RnBu
ps.setInt(1, cb.getCountId()); `$fKS24u
ps.executeUpdate();⑴ p3Ey[kURp
//ps.addBatch();⑵ z 2/E?$(
} V2v}F=
//int [] counts = ps.executeBatch();⑶ j'2:z#
conn.commit(); s-S#qGZ
}catch(Exception e){ bhqV2y*'
e.printStackTrace(); a 8(mU%
} finally{ +NM`y=@@
try{ 3Z taj^v
if(ps!=null) { pA~eGar_J
ps.clearParameters(); +\Zr\fOe|%
ps.close(); j\/Rjn+:[
ps=null; "DpgX8lG_
} D^\gU-8M
}catch(SQLException e){} <w9<G
DBUtils.closeConnection(conn); ZQ MK1
} p+ki1!Ed
} .huk>
public long getLast(){ c9uln
return lastExecuteTime; a7Xa3 vlpO
} (**k4c,
public void run(){ H
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long now = System.currentTimeMillis(); eHIsTL@Fp
if ((now - lastExecuteTime) > executeSep) { <k c9KE
//System.out.print("lastExecuteTime:"+lastExecuteTime); +nOa&d\
//System.out.print(" now:"+now+"\n"); t,v=~LE
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); x%$as;
lastExecuteTime=now; 4ayZ.`aK
executeUpdate(); )<>1Q{j@
} R9-Ps qmF
else{ ]:K[{3iM
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); v
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} DJ]GM|?
} s|q]11r+H
} V1d{E 0lM
//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.^cd"
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类写好了,下面是在JSP中如下调用。 pOmHxFOOK
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<%
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CountBean cb=new CountBean(); '^6jRI,
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); i*3*)l y
CountCache.add(cb); +{7/+Zz
out.print(CountCache.list.size()+"<br>"); W["c3c
CountControl c=new CountControl(); vIK+18v7
c.run(); 7)FI_uW
out.print(CountCache.list.size()+"<br>"); Y/Dah*
%>