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: >}{'{
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CountBean.java Oo{+W5[
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/* (as'(+B
* CountData.java ^znj J\
*
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* Created on 2007年1月1日, 下午4:44 ]37k\O?vd
* t]1j4S"pm
* To change this template, choose Tools | Options and locate the template under 6||zwwk'.
* the Source Creation and Management node. Right-click the template and choose #|'&%n|Z
* Open. You can then make changes to the template in the Source Editor.
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*/ [9S\3&yoh
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package com.tot.count; D6&fDhO27
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/** b5u_x_us|
* \q#s/&b
* @author HPVW2Y0_N
*/ o3*IfD
public class CountBean { (3z: ;
private String countType; 9!sx
int countId; It,m %5
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/** Creates a new instance of CountData */ JJJlgr]#
public CountBean() {} Qp8.D4^@3
public void setCountType(String countTypes){ bZ c&uq_
this.countType=countTypes; ZAe>MNtW
} -FA]%Pl<'
public void setCountId(int countIds){ M,1Yce%+}
this.countId=countIds; nnLE dJ}n
} Am3^3>
public String getCountType(){ Iw(2D(se
return countType; [oN}zZP]
} {?*3Ou
public int getCountId(){ ^)=c74;;
return countId; ]UyIp`nV;
} ?Pz:H/$
} l/[0N@r~
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CountCache.java >xu}eWSz
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/* 0JTDJZOz@#
* CountCache.java "(j.:jayd
* h_6QVab@
* Created on 2007年1月1日, 下午5:01 #iD5&
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* .QX|:]|n
* To change this template, choose Tools | Options and locate the template under =&?}qa(P
* the Source Creation and Management node. Right-click the template and choose JzH\_,,
* Open. You can then make changes to the template in the Source Editor. 0KqG J:Ru
*/ '/+l\.z"&
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package com.tot.count; !FOPFPn
import java.util.*; OD5c,IkWB
/** z:f[<`,GT
* tK)E*!
* @author h-`Jd>u"
*/ w6>'n
}
public class CountCache { X}b%gblx
public static LinkedList list=new LinkedList(); Q`ERI5b6
/** Creates a new instance of CountCache */ v
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public CountCache() {} e|Iylv[3
public static void add(CountBean cb){ `-!t 8BH
if(cb!=null){ F`,XB[}2
list.add(cb); w^N xR,
} l
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} lVY`^pw?
} !fF1tW
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CountControl.java Y%!3/3T
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/* :NJb<%$
* CountThread.java *IWO ,!
* ]5IG00`
* Created on 2007年1月1日, 下午4:57 tU7,nE>p
* Rb=T'x'
* To change this template, choose Tools | Options and locate the template under VD+TJ` r
* the Source Creation and Management node. Right-click the template and choose |GgFdn`>
* Open. You can then make changes to the template in the Source Editor. \(Z'@5vC
*/ g/ONr,l`-
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package com.tot.count; *njdqr2c~
import tot.db.DBUtils; ,lSt}Lml
import java.sql.*; W 0^.Dx
/** A `\2]t$z
* J$6tCFD
* @author td-2[Sy
*/ @dE|UZ=(
public class CountControl{ 9d{iq"*R
private static long lastExecuteTime=0;//上次更新时间 %RA8M-
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 {>[,i`)
/** Creates a new instance of CountThread */ :9H=D^J
public CountControl() {} TS+itU62
public synchronized void executeUpdate(){ kzPHPERA]
Connection conn=null; B$A`-
PreparedStatement ps=null; Lf _`8Ux
try{ A-<\?13uW
conn = DBUtils.getConnection(); CuRYtY@9
conn.setAutoCommit(false); r@L19d)J
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Q?Vq/3K;
for(int i=0;i<CountCache.list.size();i++){ KK"uSC
CountBean cb=(CountBean)CountCache.list.getFirst(); nxH=Ut7{
CountCache.list.removeFirst(); {8D`A;KD
ps.setInt(1, cb.getCountId()); -U;2
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ps.executeUpdate();⑴ uPbvN[~t
//ps.addBatch();⑵ dr3#?%
} 5{cbcuG
//int [] counts = ps.executeBatch();⑶ <i34;`)b
conn.commit(); 4Z>KrFO
}catch(Exception e){ --E_s/
e.printStackTrace(); 1~\YJEsb}d
} finally{
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try{ 8Z{&b,Y4L
if(ps!=null) { b%<-(o/
ps.clearParameters(); z
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ps.close(); +O
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ps=null; "PH}\Dl=
} O#}T.5t
}catch(SQLException e){} 8Wx>,$k
DBUtils.closeConnection(conn); En$-,8\%
} 3'WJx=0?
} l;^Id#N
public long getLast(){ :'RmT3
return lastExecuteTime; EhDKh\OY5
} .}gGtH,b3
public void run(){ y]$%>N0vLX
long now = System.currentTimeMillis();
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if ((now - lastExecuteTime) > executeSep) { v-u53Fy
//System.out.print("lastExecuteTime:"+lastExecuteTime); $%9.qy\8
//System.out.print(" now:"+now+"\n"); EJ7}h?a]U_
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^eke,,~
lastExecuteTime=now; L+y}hb
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executeUpdate(); 7i?"akr4
} ximW!y7
else{ ~bU!4P}4j
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); csP 5R3
} ?m5@ 635
} 0OLE/T<Xv
} xu9K\/{7
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 :tclYX
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类写好了,下面是在JSP中如下调用。 `7<4]#b^o
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<% 4DaLt&1
CountBean cb=new CountBean(); n$B SO
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); /c3A>
CountCache.add(cb); ;]AJ_h(<`
out.print(CountCache.list.size()+"<br>"); hh\}WaY
CountControl c=new CountControl(); 2LS03 27
c.run(); Do-~-d4
out.print(CountCache.list.size()+"<br>"); Z_vIGH|1
%>