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: uqTOEHH7
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CountBean.java 7 aDI6G
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/* <e/O"6='Z
* CountData.java 5\R8>G~H
* aCGPtA'
* Created on 2007年1月1日, 下午4:44 1Y}gki^F
* =!#DUfQf
* To change this template, choose Tools | Options and locate the template under o<Y|N
* the Source Creation and Management node. Right-click the template and choose 3C_g)5
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* Open. You can then make changes to the template in the Source Editor. |i|YlWQS
*/ ~gI%
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package com.tot.count; P2`ks[u+i
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/** /R|"/B0
* 3q pkMu3
* @author wf|CE410
*/ h@{@OAu?
public class CountBean { =_^g]?5i
private String countType; y*uL,WH
int countId; ZmmuP/~2K
/** Creates a new instance of CountData */ HoRLy*nU
public CountBean() {} +% U@
public void setCountType(String countTypes){ ?ZDx9*f
this.countType=countTypes; (/ k, q
} \R79^
public void setCountId(int countIds){ Ae ue:u>
this.countId=countIds; {F@;45)o
} -F8%U:2a
public String getCountType(){ TUpEhQ+*
return countType; ^1*p]j(
} 8$G$Rdn
public int getCountId(){ dcHkb,HsO
return countId; l_,8_u7G
} "hy#L
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} c#HocwP@
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CountCache.java "K\Rq+si
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/* A=XM(2{aN
* CountCache.java !kV?h5@Bo
* qZ1fQN1yG
* Created on 2007年1月1日, 下午5:01 Z<&:
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* X,y$!2QI
* To change this template, choose Tools | Options and locate the template under NoKYHN^*w
* the Source Creation and Management node. Right-click the template and choose BwEL\*$g
* Open. You can then make changes to the template in the Source Editor. &Q&$J )0
*/ .Bi7~*N
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package com.tot.count; A@DIq/^xM
import java.util.*; q5HHMHB
/** G53!wIW2:
* E&[ox[g{
* @author S:1! )7
*/ ait/|a
public class CountCache { _')KDy7
public static LinkedList list=new LinkedList(); v
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/** Creates a new instance of CountCache */ @l;f';+
public CountCache() {} w^ DAu1
public static void add(CountBean cb){ ")sq?1?X
if(cb!=null){ ]\_4r)cN<n
list.add(cb); ol:_2G2xQ
} .5I1wRN49
} ]]7s9PCN
} p1|@F^Q
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CountControl.java +:Y6O'h.
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/* F`38sq
* CountThread.java sF<4uy
* 3b[_0
* Created on 2007年1月1日, 下午4:57 xknP
`T
* wiFckF/
* To change this template, choose Tools | Options and locate the template under L^0jyp
* the Source Creation and Management node. Right-click the template and choose T
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* Open. You can then make changes to the template in the Source Editor. U#Z}a
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*/ !D6@ \
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package com.tot.count; EL+}ab2S
import tot.db.DBUtils; :_?>3c}L
import java.sql.*; `Y(/G"]
/** 8<g5.$xyz
* VTV-$Du[}
* @author h\20
*/ CF$^we
public class CountControl{ )D#*Q~
private static long lastExecuteTime=0;//上次更新时间 i4uUvZf
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 f-23.]`v
/** Creates a new instance of CountThread */ Qb SX'mx<
public CountControl() {} 7pGlbdS
public synchronized void executeUpdate(){ \.*aC)
Connection conn=null; M<)HJ lr
PreparedStatement ps=null; *.i`hfRc
try{ 3N<FG.6
conn = DBUtils.getConnection(); 2pB@qi-]
conn.setAutoCommit(false); {j^}"8GB
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); evn ]n
for(int i=0;i<CountCache.list.size();i++){ ,I)/ V>u
CountBean cb=(CountBean)CountCache.list.getFirst(); K\;b3
CountCache.list.removeFirst(); S(rA96n
ps.setInt(1, cb.getCountId()); ,rG$JCS'KQ
ps.executeUpdate();⑴ ]^.#d
//ps.addBatch();⑵ T"dEa-O
} gE:qMs;
//int [] counts = ps.executeBatch();⑶ 5$jKw\FF=
conn.commit(); //AS44^IS
}catch(Exception e){ 0h#' 3z<
e.printStackTrace(); {
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} finally{ =m1B1St 2
try{ VV?KJz=,W=
if(ps!=null) { z?+N3p9
ps.clearParameters(); }t]CDa_n
ps.close(); 'GNT'y_
ps=null; /tV)8pEj
} \f%jN1z
}catch(SQLException e){} zQD$+q5h
DBUtils.closeConnection(conn); wLNO\JP'
} o,u-%
} dx:],VB
public long getLast(){ r6j
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return lastExecuteTime; [['un\~r~
} +Pn+&o;D
public void run(){ +]Ydf^rF
long now = System.currentTimeMillis(); Au:Q4x.
if ((now - lastExecuteTime) > executeSep) { uE+]]ir
//System.out.print("lastExecuteTime:"+lastExecuteTime); Bm.%bA>
//System.out.print(" now:"+now+"\n"); O~ w&4F;{
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); dRt]9gIsx
lastExecuteTime=now; R`A@F2
executeUpdate(); wD"Y1?Mr
} -Vw,9VCF
else{ CYs:P8^
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); W}nD#9tL
} tE- s/
} YW0UIO
} @
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//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 }<A\>
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类写好了,下面是在JSP中如下调用。 jsc1B
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<% leX&py
CountBean cb=new CountBean(); yp_:]RE
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); i,Yv
CountCache.add(cb); IIs'm!"Y>
out.print(CountCache.list.size()+"<br>"); (*BQd1Z
CountControl c=new CountControl(); 05.^MU?^U
c.run(); &+d>xy\^/
out.print(CountCache.list.size()+"<br>"); )<t5' +d%
%>