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: U[u6UG
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CountBean.java H2p;J#cv@
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/* ==9Ez
* CountData.java Kxn=iv^Ir
* H(| v
* Created on 2007年1月1日, 下午4:44 0&@6NW&Mu
* zyE yZc?
* To change this template, choose Tools | Options and locate the template under ;!b(b%
* the Source Creation and Management node. Right-click the template and choose T9 1Iz+j
* Open. You can then make changes to the template in the Source Editor. L M[<?`%p
*/ yo=d"*E4^
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package com.tot.count; qK
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/** OduTg^R
* J/ ~]A1fP6
* @author oc3/
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*/ X5=7DE]
public class CountBean { t<=L&:<N
private String countType; el<nY"c
int countId; %]` W sG
/** Creates a new instance of CountData */ c4|.!AQ>
public CountBean() {} E7,\s
public void setCountType(String countTypes){ rv[\2@}
this.countType=countTypes; B^Q#@[T
} ueOvBFgZ
public void setCountId(int countIds){
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this.countId=countIds; _<$=n6#
} \GN5Sy]r
public String getCountType(){ T/ov0l_
return countType; C%&7,F7
} okW3V}/x/z
public int getCountId(){ aNz%vbh\
return countId; ~Hq
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} dK-G%5)r
} ,^(T^ -
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CountCache.java "T'!cy
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/* N=kACEo
* CountCache.java GZ%RfKyQ
* xiiZ'U
* Created on 2007年1月1日, 下午5:01 )c*~Y=f
* P%.5xYn
* To change this template, choose Tools | Options and locate the template under 6 B
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* the Source Creation and Management node. Right-click the template and choose s}.nh>Q
* Open. You can then make changes to the template in the Source Editor. ]loO 5
*/ hN.#ui5 $
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package com.tot.count; =F`h2 A;a
import java.util.*; T F'ssD
/** nL$tXm-x
* `:2C9,Xu
* @author k $);<= ZI
*/ `yhL11]~
public class CountCache { I|.B-$gH
public static LinkedList list=new LinkedList(); 1)%o:Xy o
/** Creates a new instance of CountCache */ !#r]f9QP
public CountCache() {} 6 3HxQH
public static void add(CountBean cb){ jq[>PvR
if(cb!=null){ bx@CzXre;
list.add(cb); rScmUt
} 0-5:"SN'
} H;^6%HV1
} TiOvrp7B
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CountControl.java Nb$ )YMbA
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/* NEN br$,G
* CountThread.java r4-r
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* fF9vV. }
* Created on 2007年1月1日, 下午4:57 FnCHbPlb
* !:>y.^O
* To change this template, choose Tools | Options and locate the template under N=wB1gJ
* the Source Creation and Management node. Right-click the template and choose |h3YL!
* Open. You can then make changes to the template in the Source Editor. W6)A":`
*/ G~_dSa@g G
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package com.tot.count; \dP2xou=
import tot.db.DBUtils; ]6%| L
import java.sql.*; ci$o~b6V
/** {C<ch@sR
* EZ$m4:{e
* @author <EE)d@%>v
*/ >FY`xl\m}<
public class CountControl{ S]<Hx_[}
private static long lastExecuteTime=0;//上次更新时间 [1E u6X6
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 b&!X#3(KT
/** Creates a new instance of CountThread */ <AB]FBo(
public CountControl() {} <)rol
public synchronized void executeUpdate(){ GI/g@RV
Connection conn=null; a.q=
PreparedStatement ps=null; gHTo|2 Q{
try{ <%|2yPb]
conn = DBUtils.getConnection(); RhYf+?2
conn.setAutoCommit(false); E$RH+):|
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); N5g!,3
for(int i=0;i<CountCache.list.size();i++){ or0f%wAF
CountBean cb=(CountBean)CountCache.list.getFirst(); iLgWzA
CountCache.list.removeFirst(); dC)@v]#h
ps.setInt(1, cb.getCountId()); q),yY]5
ps.executeUpdate();⑴ mio\}SA
//ps.addBatch();⑵ 32dR`qb
} /S]<MS
//int [] counts = ps.executeBatch();⑶ 5*~G7/hT
conn.commit(); o@"H3
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}catch(Exception e){ )y._]is)b
e.printStackTrace(); b^rPw@
} finally{ zU]95I
try{ u3kZOsG
if(ps!=null) { ,\ov$biL
ps.clearParameters(); dZ_Hj X7
ps.close(); 8M!If
ps=null; 06L/i,
} IE,xiV
}catch(SQLException e){} A=Dzd/CUO
DBUtils.closeConnection(conn); tK0?9M.)
} Eufw1vDa
} fmFh.m.+N
public long getLast(){ jo/-'Lf{?
return lastExecuteTime; Y=\;$:L[
} j#zUO&Q@
public void run(){ n-0RA~5z
long now = System.currentTimeMillis(); !bRoNP
if ((now - lastExecuteTime) > executeSep) { &E0P`F,GQA
//System.out.print("lastExecuteTime:"+lastExecuteTime); ?o?~Df&
//System.out.print(" now:"+now+"\n"); =UT*1-yhR
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); }GRZCX>
lastExecuteTime=now; ?u/RQ 1
executeUpdate(); } U\n:@:2B
} 1ti+
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else{ r<
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); rK7m(
} IXc"gO
}
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} OLg=kF[[
//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 -YPUrU[)
@Ge\odfF:
类写好了,下面是在JSP中如下调用。 B=8],_
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<% krnxM7y
CountBean cb=new CountBean(); B}Qpqa=_c
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Y|stxeOC
CountCache.add(cb); __O@w.
out.print(CountCache.list.size()+"<br>"); Q+YYj
CountControl c=new CountControl(); AU0pJB'
c.run(); Rw-!P>S$
out.print(CountCache.list.size()+"<br>"); {$5?[KD
%>