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: JE a~avyJ
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CountBean.java zS9HR1
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/* !mjrI "_
* CountData.java -`I&hzl6E
* B<p-qPR K
* Created on 2007年1月1日, 下午4:44 b"DV8fdX
* 6T?$m7c
* To change this template, choose Tools | Options and locate the template under .T2P%Jn.
* the Source Creation and Management node. Right-click the template and choose pR3@loFQ`o
* Open. You can then make changes to the template in the Source Editor. >@Nn_d
*/ m-<"`:+
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package com.tot.count; LU-,B?1
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/** ii3{HJ*C
* \ah.@s
* @author $QNII+o
*/ {RmN1'%
public class CountBean { ;JD/4:
private String countType; ^&!SnM
int countId; Smt&/~7D%
/** Creates a new instance of CountData */ 6m~ N2^z
public CountBean() {} ezq<)gJc
public void setCountType(String countTypes){ /8Sr(
this.countType=countTypes; G1=/G
} ul-A'
public void setCountId(int countIds){ |7pi9
this.countId=countIds; w1Xe9'$Qb
} wNfWHaH" m
public String getCountType(){ + a,x
return countType; W$>AK_Y}
} wN+3OPM
public int getCountId(){ tL#]G?0d
return countId; pV^(8!+
} &OMe'P
} e5GJ:2sH
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CountCache.java 7)i6L'r
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/* V-7A80!5
* CountCache.java RBA{!
* CJ~gE"
* Created on 2007年1月1日, 下午5:01 URo#0fV4C
* Xi:y3 5q
* To change this template, choose Tools | Options and locate the template under -4=\uvYh
* the Source Creation and Management node. Right-click the template and choose Dcep^8'
* Open. You can then make changes to the template in the Source Editor. z6Xn9
*/ 6^+T_{gl
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package com.tot.count; A*a:#'"*N
import java.util.*; 0dKv%X#\
/** 7`G
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* t0"2Si
* @author b~u53
*/ Qp5YS
public class CountCache { j1sgvh]D
public static LinkedList list=new LinkedList(); [b?[LK}.
/** Creates a new instance of CountCache */ ?r%kif)
public CountCache() {} :~ ; 48m
public static void add(CountBean cb){ B.oD9 <9
if(cb!=null){ y.6Yl**l
list.add(cb); rHMr8,J;
} c+bOp
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} 6a%dq"5 +
} FRR`<do5$,
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CountControl.java }u
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/* ^h5h kIx0
* CountThread.java 'ZXd|WI
* )_H>d<di
* Created on 2007年1月1日, 下午4:57 -Z<V?SFOK
* q
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* To change this template, choose Tools | Options and locate the template under Q$B\)9`v[
* the Source Creation and Management node. Right-click the template and choose ? JliKFD%
* Open. You can then make changes to the template in the Source Editor. T:G8xI1
P
*/ 3yXSv1
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package com.tot.count; 4r-CF#o
import tot.db.DBUtils; Es^=&2''
import java.sql.*; Q\qI+F2?
/** {*NM~yQ
* upc-Qvk
* @author #FwTV@
*/ h)o5j-M>4
public class CountControl{ G,,7.%eib=
private static long lastExecuteTime=0;//上次更新时间 a?NoNv)&
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 =kiDW6
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/** Creates a new instance of CountThread */ 7FYq6wi
public CountControl() {} !hc#il'g].
public synchronized void executeUpdate(){ l(j._j~p
Connection conn=null; }^"#&w3<
PreparedStatement ps=null; ysDGF@wZC
try{ KM&bu='L^
conn = DBUtils.getConnection(); 8_h:_7e
conn.setAutoCommit(false); !gX(Vh*k
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); DFvj
for(int i=0;i<CountCache.list.size();i++){ D:DtP6
CountBean cb=(CountBean)CountCache.list.getFirst(); FC&841F
CountCache.list.removeFirst(); }u&,;]
ps.setInt(1, cb.getCountId()); 8oxYgj&~X
ps.executeUpdate();⑴ <3WaFi u
//ps.addBatch();⑵ rT/4w#_3
} 8HxtmFqG
//int [] counts = ps.executeBatch();⑶ pY"&=I79tb
conn.commit(); &3~_9+
}catch(Exception e){ ^3
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e.printStackTrace(); C<"b99\2`
} finally{ \1[v-hvK
try{ h#?)H7ft
if(ps!=null) { _WB*ArR
ps.clearParameters(); CWx_9b zk
ps.close(); 0m>?-/uDx
ps=null; u[b0MNE~
} h5p,BRtu
}catch(SQLException e){}
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DBUtils.closeConnection(conn); K=Y{iHn
} ~H\1dCW
} #Ab,h#f*7
public long getLast(){ &C&?kS(
return lastExecuteTime; &|#z" E^-
} 34s>hm=0.
public void run(){ d.:.f_|
long now = System.currentTimeMillis(); a$2WL g,
if ((now - lastExecuteTime) > executeSep) { VcpN
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//System.out.print("lastExecuteTime:"+lastExecuteTime); LP:U6 Z
//System.out.print(" now:"+now+"\n"); Ew$-,KC[
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); bG&vCH;}%
lastExecuteTime=now; c8}jO=/5+
executeUpdate(); nX\Q{R2
} 1Uf8ef1,
else{ ^ygh[.e,
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); RAY.]:}jr
} @(I)]Ca%O
} snti*e4"V
} Rf0F`D k
//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 }&