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: 4P1<Zi+<
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CountBean.java ncF|wz
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/* >= G{.H
* CountData.java y;M}I8W[
* ^xBF$ua37)
* Created on 2007年1月1日, 下午4:44 G4VdJ(_
* >?pWbL
* To change this template, choose Tools | Options and locate the template under mBp3_E.t
* the Source Creation and Management node. Right-click the template and choose i4',d#
* Open. You can then make changes to the template in the Source Editor. nUgZ]ag=G
*/ k7R8Q~4
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package com.tot.count; +Wr"c
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/** ,wyfMOGLt
* +{qX,
* @author .<0s?Q
*/ LjE@[@d
public class CountBean { ,KM-DCwcG
private String countType; `oDs]90
int countId; RB\0o,mw4
/** Creates a new instance of CountData */ v#HaZT]u
public CountBean() {} s,tZi6Z=%E
public void setCountType(String countTypes){ n$jOk
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this.countType=countTypes; *{ =5AW}o
} mnZS](>
public void setCountId(int countIds){ _tl,-}~
this.countId=countIds; d]kP@flOV
} T)!$-qdz/
public String getCountType(){ QG|KZ8uO
return countType; R(i2TAaaU
} qtqTLl@u
public int getCountId(){ 8 |@WuD
return countId; +c8cyx:^f
} 500qg({2]
} -w0U}Te^
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CountCache.java .U66Uet>RX
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/* &TpzJcd"
* CountCache.java DgJG: D{
* 1 z4s1Y
* Created on 2007年1月1日, 下午5:01 A7/
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* &$'=SL(Z
* To change this template, choose Tools | Options and locate the template under RWN2P6
* the Source Creation and Management node. Right-click the template and choose 0Hs\q!5Q
* Open. You can then make changes to the template in the Source Editor. JOR ?xCc
*/ g _2m["6*
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package com.tot.count; i$Rlb5RU
import java.util.*; 5M.KF;P
/** zF&>1y.$
* ?q68{!{bi
* @author !'-|]xx(
*/ :+Pl~X"_
public class CountCache { D^E+#a 1
public static LinkedList list=new LinkedList(); <2\4eusk
/** Creates a new instance of CountCache */ =,*4:TU
public CountCache() {} q=o"]
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public static void add(CountBean cb){ wU\3"!^h
if(cb!=null){ OVsZUmSG
list.add(cb); [*-DtbEk
} KcGM=z?:
} 0n<t/74
} 6J|Ee1Ez
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CountControl.java 5WR(jl+M
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/* WQ\H2go
* CountThread.java ZMSP8(V
* 2:(h17So
* Created on 2007年1月1日, 下午4:57 =YPvh]][
* ~Wq[H
* To change this template, choose Tools | Options and locate the template under k+^-;=u6<
* the Source Creation and Management node. Right-click the template and choose 0|0<[:(hc
* Open. You can then make changes to the template in the Source Editor. G22=8V
*/ N'L3Oa\%
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package com.tot.count; D`;Q?fC
import tot.db.DBUtils; *$ZLu jy7
import java.sql.*; #,dE)
/** JrF\7*rh9
* =K<8X!xUW
* @author 8^3Z]=(Q
*/ P:z 5/??2S
public class CountControl{ I("J$
private static long lastExecuteTime=0;//上次更新时间 ^Zh
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `>@n6>f
/** Creates a new instance of CountThread */ r5!I|E
public CountControl() {} =sG9]a<I
public synchronized void executeUpdate(){ L#'B-G4&y
Connection conn=null; QI@!QU$K&
PreparedStatement ps=null; ,!"\L~6
try{ $]/a/!d
conn = DBUtils.getConnection(); ,B>Rc#
conn.setAutoCommit(false); kLKd
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); W
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for(int i=0;i<CountCache.list.size();i++){ dm60O8
CountBean cb=(CountBean)CountCache.list.getFirst(); `[JX}<~i
CountCache.list.removeFirst(); %DAF26t
ps.setInt(1, cb.getCountId()); &lYZ=|6
ps.executeUpdate();⑴ hSmu"a,S
//ps.addBatch();⑵ {`0GAW)q
} @g*=xwve=~
//int [] counts = ps.executeBatch();⑶ MtAD&+3$
conn.commit(); \2!v~&S
}catch(Exception e){ V~y4mpfX
e.printStackTrace(); v*Qr(4
} finally{ fu/v1Nhm
try{ W`fE@* k0
if(ps!=null) { CqVh9M.ah
ps.clearParameters(); _zQ3sm
ps.close(); CErkmod{}e
ps=null; zT|]!',
} Ws[[Me,=
}catch(SQLException e){} <$s G]l!\
DBUtils.closeConnection(conn); 8$!/Zg
} !m"(SJn"
} S8+Xk= x
public long getLast(){ 8H_3.MK
return lastExecuteTime; FAAqdK0
} ;ti{
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public void run(){ kW&{0xkGR
long now = System.currentTimeMillis(); #2c-@),
if ((now - lastExecuteTime) > executeSep) { ': Gk~
//System.out.print("lastExecuteTime:"+lastExecuteTime); Z3=DM=V;v
//System.out.print(" now:"+now+"\n");
pmAir:
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); e.eQZ5n~q`
lastExecuteTime=now; )J+vmY~&
executeUpdate(); `Nnqdc2
} #;'1aT
else{ @p jah(i`
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 4.bL>Y>c
} >\b=bT@iM
} ,R$n I*mf_
} j r6)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 -\@&^e
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类写好了,下面是在JSP中如下调用。 6vz9r)L
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<% 9PEjV$0E2
CountBean cb=new CountBean(); ):C4"2l3
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Rxld$@~-(]
CountCache.add(cb); eHG**@"X
out.print(CountCache.list.size()+"<br>"); 0Ha1pqR
CountControl c=new CountControl(); zw^jIg$
c.run(); <#ujm fD
out.print(CountCache.list.size()+"<br>"); >4=sEj
%>