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: L4+R8ojG
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CountBean.java W@GU;Nr
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/* W|;`R{<I%
* CountData.java oT:wGBW
* b* n#XTV
* Created on 2007年1月1日, 下午4:44 MS2/<LD3d
* wBI:}N@.
* To change this template, choose Tools | Options and locate the template under IN;!s#cl:
* the Source Creation and Management node. Right-click the template and choose UC`sq-n
* Open. You can then make changes to the template in the Source Editor. ?3LV$S)U
*/ VAheus
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package com.tot.count; 1mh7fZgn
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/** \\Zsxya1
* U1yspHiZ
* @author -hF!_);{
*/ yq2AZ@}"
public class CountBean { Tz:,l$
private String countType; @VND}{j
int countId; &H,UWtU+
/** Creates a new instance of CountData */ g
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public CountBean() {} PHez5 }T
public void setCountType(String countTypes){ &a >UVs?=
this.countType=countTypes; yWN'va1+$
} 5^qs>k[mN
public void setCountId(int countIds){ S=L#8CID
this.countId=countIds; BB/c5?V
} LEg|R+6E
public String getCountType(){ x
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return countType; ^}gZ+!kA
} :1UOT'_
public int getCountId(){ K^/.v<w
return countId; fP;I{AiN~
} 0ly6 |:
} gpbdK?
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CountCache.java FAGi`X<L
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/* ls "Z4v(L6
* CountCache.java iF:NDqc
* +5GC?cW
* Created on 2007年1月1日, 下午5:01 +Z9ua%,3%
* ncsk(`lo
* To change this template, choose Tools | Options and locate the template under EcR[b@YI
* the Source Creation and Management node. Right-click the template and choose t1#f*G5
* Open. You can then make changes to the template in the Source Editor. k9y/.Mu
*/ >FFp"%%
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package com.tot.count; kmJ<AnK
import java.util.*; tsB}'+!v#
/** g]b%<DJ
* 21?>rezJ
* @author pXNH
*/ aO:A pOAO
public class CountCache { xy)W_~Mk
public static LinkedList list=new LinkedList(); +miL naO~L
/** Creates a new instance of CountCache */ '7]9q#{su
public CountCache() {} 5 "x1Pln
public static void add(CountBean cb){ >G0ihhVt
if(cb!=null){ ]VN1Y)
list.add(cb); =*?XZA)c
} nwDW<J{f|U
} ^sJp!hi4=)
} U|+`Eth8(
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CountControl.java li`
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/* q~\[P4m
* CountThread.java p|r>tBv?x
* qm=9!jqC;
* Created on 2007年1月1日, 下午4:57 )qWO}]F
* p:!FB8
* To change this template, choose Tools | Options and locate the template under (/P-9<"U
* the Source Creation and Management node. Right-click the template and choose y+.(E-g
* Open. You can then make changes to the template in the Source Editor.
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*/ SwH #=hg
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package com.tot.count; >BMtR0
import tot.db.DBUtils; ~c=*Y=)LG
import java.sql.*; bOlb
/** XOZ@ek)LY
* \7(OFT\u:
* @author )d5mZE!3
*/ JkNRXC:
public class CountControl{ OH5#.${O
private static long lastExecuteTime=0;//上次更新时间 u])MI6LF
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I\82_t8
/** Creates a new instance of CountThread */ ;4vx+> -
public CountControl() {} (>om.FM
public synchronized void executeUpdate(){ Nm0|U.<
Connection conn=null; cl'qw##
PreparedStatement ps=null; 0te[i*G
try{ $O9#4A;
conn = DBUtils.getConnection(); M[Jy?b)
conn.setAutoCommit(false); !;U}ax;AF
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I"jub
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for(int i=0;i<CountCache.list.size();i++){ WODgG@w
CountBean cb=(CountBean)CountCache.list.getFirst(); VBu6,6
CountCache.list.removeFirst(); ]@msjz'
ps.setInt(1, cb.getCountId()); p#dYNed]'
ps.executeUpdate();⑴ ^ s/f.#'
//ps.addBatch();⑵ 0^MRPE|f5
} M`G#cEc
//int [] counts = ps.executeBatch();⑶
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conn.commit(); 2CPh'7|l
}catch(Exception e){ T
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e.printStackTrace(); SM`n:{N(
} finally{ .ffb*gZ4
try{ W%}zwQ
if(ps!=null) { YR~)07
ps.clearParameters(); _ Av_jw`m
ps.close(); 4p(\2?B%f
ps=null; u,Cf4H*xS
} *2I@_b6&
}catch(SQLException e){} /3 ;t
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DBUtils.closeConnection(conn); SDW!9jm>R
} @(e/Y/
} TP)}1@
public long getLast(){ safI`bw1
return lastExecuteTime; hzy#%FaB
} j1$s^ -9
public void run(){ 2o`L^^
long now = System.currentTimeMillis(); v1s0kdR,>
if ((now - lastExecuteTime) > executeSep) { Al}%r85
//System.out.print("lastExecuteTime:"+lastExecuteTime); Ykj+D7rA:
//System.out.print(" now:"+now+"\n");
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); EYKV}`
lastExecuteTime=now; RMxFo\TK;
executeUpdate(); K!SFS
} y$HV;%G{26
else{ NB)22 %
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); yUFT9bD
} ,S=ur%
} MvlqxJ$
} oei2$uu
//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 #;>v,Jo
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类写好了,下面是在JSP中如下调用。 2xpI|+a%
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<% n ]P,5
CountBean cb=new CountBean(); ]hi5nA
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); j |ZhGerp
CountCache.add(cb); JE/Kf<
out.print(CountCache.list.size()+"<br>"); !&vPG>V
CountControl c=new CountControl(); (%iCP/E3
c.run(); Wr\A ->+
out.print(CountCache.list.size()+"<br>");
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%>