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: !4jS=Lhe>
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CountBean.java 8XJ%Yuu
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/* /,0t,"&Aqa
* CountData.java 1}8e@`G0.]
* v!F(DP.)Z
* Created on 2007年1月1日, 下午4:44 r 'jVF'w
* _n}!1(xYa`
* To change this template, choose Tools | Options and locate the template under b9y
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* the Source Creation and Management node. Right-click the template and choose x\Sp~]o3C
* Open. You can then make changes to the template in the Source Editor. E7_^RWG
*/ A{6ZEQAh>
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package com.tot.count; LwGcy1F.
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/** }UGPEf\
* J*U(f{Q(
* @author "-xC59,
*/ :{66WSa@Dd
public class CountBean { 1| gP
:t}
private String countType; KUyua~tF
int countId; &`TX4b^/!
/** Creates a new instance of CountData */ =_yOX=g|
public CountBean() {} N%B#f\N
public void setCountType(String countTypes){ <O>Q;}>gfc
this.countType=countTypes; Zo0&<QWj
} ,XA;S5FE
public void setCountId(int countIds){ Pm?6]] 7
this.countId=countIds; )%tf,3
} s*l_O*$'
public String getCountType(){ |ntJ+
return countType; R9CAw>s
} CYrL|{M]
public int getCountId(){ XbH X,W$h
return countId; _u:#2K$
} <![T~<.
} ZY/at/v
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CountCache.java sG VC+!E
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/* f8&=D4)-w
* CountCache.java If&p$pAH?
* C3_*o>8
* Created on 2007年1月1日, 下午5:01 M}5 C;E*
* `\Npu
* To change this template, choose Tools | Options and locate the template under Zh(f2urKV
* the Source Creation and Management node. Right-click the template and choose q$t& *O_
* Open. You can then make changes to the template in the Source Editor. hsE!3[[
*/ }]s~L9_z['
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package com.tot.count; ^2??]R&Q
import java.util.*; gR( c;
/** ]52_p[hZ}<
* B\=&v8
* @author cKfYkJ)A'
*/ 3?geJlD4
public class CountCache { ?B}>[
public static LinkedList list=new LinkedList(); wM&G-~9ujk
/** Creates a new instance of CountCache */ fzKKK+
public CountCache() {} YT:1=Nf}
public static void add(CountBean cb){ Z0'3.D,l
if(cb!=null){ Rp<Xu6r
list.add(cb); rb_G0/R
} )T3wU~%
} v[|iuOU
} SA&wW\Ym]
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CountControl.java ;dWqMnV
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/* ;,A\bmC
* CountThread.java B#DV<%GPl
* 7uDUZdJy
* Created on 2007年1月1日, 下午4:57 vn_avYwiy
* @!MbPS
* To change this template, choose Tools | Options and locate the template under 9qW,I|G
* the Source Creation and Management node. Right-click the template and choose X%-4x
* Open. You can then make changes to the template in the Source Editor. WIGb7}egR
*/ t!=S[
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package com.tot.count; vK{K#{
import tot.db.DBUtils; L9kP8&&KK
import java.sql.*; )} #r"!
/** LH_ 2oJ\
* CeJ|z{F\
* @author ZRHTvxf
*/ hB.dqv]^
public class CountControl{ j>T''Tf
private static long lastExecuteTime=0;//上次更新时间 !^7:Rr_
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [V f|4xcD
/** Creates a new instance of CountThread */ # SXXYh-e
public CountControl() {} B%pvk.`
public synchronized void executeUpdate(){ xn@jL;+<-
Connection conn=null; b?^n'0
PreparedStatement ps=null; w#1dO~
try{ /f[_]LeV]
conn = DBUtils.getConnection(); 8vRiVJ8QS:
conn.setAutoCommit(false); ~4^e a
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); g3Q #B7A
for(int i=0;i<CountCache.list.size();i++){ yS43>UK_W+
CountBean cb=(CountBean)CountCache.list.getFirst(); Yru[{h8hw`
CountCache.list.removeFirst(); 4TKi)0
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ps.setInt(1, cb.getCountId()); .3&m:P8zV
ps.executeUpdate();⑴ ;H=6u
//ps.addBatch();⑵ %;5hHRA
} H5AY6),
//int [] counts = ps.executeBatch();⑶ st2>e1vg
conn.commit(); e&5K]W0{
}catch(Exception e){ (wfg84
e.printStackTrace(); p\WUk@4
} finally{ kT1lOP-Bg
try{ VJ"3G;;
if(ps!=null) { >guQY I@4,
ps.clearParameters(); ah92<'ix
ps.close(); yU.0'r5uR
ps=null; zaZ}:N/w(z
} ,54<U~Lg:
}catch(SQLException e){} fUXp)0O
DBUtils.closeConnection(conn); GN<I|mGLJK
} 8zCAy@u
} hF~B&^dd.
public long getLast(){ ]| yH8 m
return lastExecuteTime; twtDyo(\
} $ZU(bEUOG
public void run(){ H1[aNwLr
long now = System.currentTimeMillis(); zi
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if ((now - lastExecuteTime) > executeSep) { agYKaM1N
//System.out.print("lastExecuteTime:"+lastExecuteTime); Kq$Zyf=E
//System.out.print(" now:"+now+"\n"); ie!4z34
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); W!k6qTz)
lastExecuteTime=now; }D^Gt)
executeUpdate(); #+;=ijyF
} taQ[>x7b
else{ 6`C27
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 7|-xM>L$A
} $ZRN#x@
} >D<=9G(a
} fq|2E&&v
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 _&/Zab5
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类写好了,下面是在JSP中如下调用。 mTfMuPPs[
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<% DVJc-.x8
CountBean cb=new CountBean(); q UnFEg
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); arP+(1U
CountCache.add(cb); pqSE|3*l
out.print(CountCache.list.size()+"<br>"); pJz8e&wyLM
CountControl c=new CountControl(); {yHfE,
c.run(); L\ %_<2
out.print(CountCache.list.size()+"<br>"); \bOjb\ w$
%>