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: 8HP6+c%
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CountBean.java G>q(iF'
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/*
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* CountData.java SI=yI-
* P><o,s"v
* Created on 2007年1月1日, 下午4:44 +-G<c6 |
* AhNq/?Q Q~
* To change this template, choose Tools | Options and locate the template under W16,Alf:
* the Source Creation and Management node. Right-click the template and choose 4fKC 6UR
* Open. You can then make changes to the template in the Source Editor. 5:kH;/U
*/ #b~JDO(
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package com.tot.count; >ss/D^YS
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/** /FIE:Io
* $ >EYhLBa
* @author MX@_=Sp-
*/ l~M_S<4n
public class CountBean { PnoPbk[<
private String countType; Yc'kvj)_M
int countId; yfm^?G|sW
/** Creates a new instance of CountData */ 8)4P Ll
public CountBean() {} APO>y
public void setCountType(String countTypes){ &0`)
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this.countType=countTypes; h}xeChw]
} %%4t~XC#
public void setCountId(int countIds){ %wSj%>&-R
this.countId=countIds; *Q,0W:~-
} z-b*D}&
public String getCountType(){ u07pq4Ly
return countType; WoBo9aR
} =X.9,$Y
public int getCountId(){ nI*v820,
return countId; rW0FA
} 'UYR5Y>
} qu-/"w<3$
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CountCache.java B|&"#Q
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/* IqD_GL)Ms
* CountCache.java ETXZ?\<a5
* `3hSLR
* Created on 2007年1月1日, 下午5:01 @0SC"CqM
* v_nj$1dY6
* To change this template, choose Tools | Options and locate the template under V7Mh-]
* the Source Creation and Management node. Right-click the template and choose R>(@ZM&
* Open. You can then make changes to the template in the Source Editor. 1Y]TA3:
*/ /=gOa\k|p
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package com.tot.count; =hMY2D
import java.util.*; -]t,E,(!
/** ]~E0gsq
* %y%j*B!%
* @author Sx8OhUyux
*/ ANps1w#TP
public class CountCache { nTz6LVF
public static LinkedList list=new LinkedList(); 9t#S= DP
/** Creates a new instance of CountCache */ Y2?.}Z O
public CountCache() {} yd?x=|
public static void add(CountBean cb){ #jxe%2'Ot
if(cb!=null){ %,k][V
list.add(cb); ^)W[l!!<)
} ()3O=!
} iX4Iu3
} j<)9dEM'
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CountControl.java sn?]n~z
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/* \}
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* CountThread.java pf_mf.
* T.qNCJmB
* Created on 2007年1月1日, 下午4:57 npNB{J[
* /*c\qXA5
* To change this template, choose Tools | Options and locate the template under as>L[jyG/
* the Source Creation and Management node. Right-click the template and choose 4X*>H
* Open. You can then make changes to the template in the Source Editor. HVC>9_:]
*/ PK4iuU`vh
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package com.tot.count; oun;rMq
import tot.db.DBUtils; b&5lY p"d
import java.sql.*; UF@XK">
/** P'O#I}Dmw<
* T
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* @author ^*fxR]Y
*/ lf!FTm7
public class CountControl{ /0eYMG+K=
private static long lastExecuteTime=0;//上次更新时间 rQaxr!
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 37RLE1Yf
/** Creates a new instance of CountThread */ "|HDGA5
public CountControl() {} HuVJ\%.
public synchronized void executeUpdate(){ eVM/uDD
Connection conn=null; dF~8XYo
PreparedStatement ps=null; 6}KZp~s
try{ NZ3/5%We/
conn = DBUtils.getConnection(); uSR~@Lj ~
conn.setAutoCommit(false); 'gt-s547
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); V,[d66H=N
for(int i=0;i<CountCache.list.size();i++){ kWrp1`
CountBean cb=(CountBean)CountCache.list.getFirst(); yOwA8^q
CountCache.list.removeFirst(); Bk+{RN(w
ps.setInt(1, cb.getCountId()); 4DOK4{4?5
ps.executeUpdate();⑴ p}<w#p
|
//ps.addBatch();⑵ d%0~c'D8a
} nO)X!dp}J
//int [] counts = ps.executeBatch();⑶ |eWjYGwJa
conn.commit();
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}catch(Exception e){ %DQhM ,c@
e.printStackTrace(); q`G, L(
} finally{ T]?n)L,2
try{ _Dwqy(
if(ps!=null) { =ID
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ps.clearParameters(); K_ci_g":
ps.close(); Vy|6E#U
ps=null; ?SC[G-b
} LbII?N8`N
}catch(SQLException e){} MG?0>^F
DBUtils.closeConnection(conn); "t0kAG
} M5trNSL&u
} CV{r5Sye
public long getLast(){ zR32PG>9
return lastExecuteTime; sIv)'
} 7^Yk`Z?|a
public void run(){ #"49fMi/
long now = System.currentTimeMillis(); E.iSWAJ(w
if ((now - lastExecuteTime) > executeSep) { .E@|D6$D
//System.out.print("lastExecuteTime:"+lastExecuteTime); %xQ.7~
//System.out.print(" now:"+now+"\n"); -uH#VP{0M
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); x[Wwq=~
lastExecuteTime=now; P(a.iu5
executeUpdate(); . ]8E7
} $:of=WTY(
else{ @;?T~^nGj
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); $ F S_E
} zY|klX})
} l)-Mq@V
} aSP4a+\*
//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 H- p;6C<
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类写好了,下面是在JSP中如下调用。 Mzd[fR5a8
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<% 99EXo+g
CountBean cb=new CountBean(); j.:h5Y^N
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); :5yV.7
CountCache.add(cb); 5ZY)nelc
out.print(CountCache.list.size()+"<br>"); &Sp -w?kM
CountControl c=new CountControl(); Y+qQI MZ
c.run(); **>/}.%?K
out.print(CountCache.list.size()+"<br>"); mw^7oO#
%>