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: *GPiOA
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CountBean.java <bWG!ZG
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/*
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* CountData.java GD$l||8
* )y$(AJx$
* Created on 2007年1月1日, 下午4:44 #"~<HG}bR/
* y<Ot)fa$
* To change this template, choose Tools | Options and locate the template under ~c `l@:
* the Source Creation and Management node. Right-click the template and choose 57c8xk[.2
* Open. You can then make changes to the template in the Source Editor. q/,O\,
*/ X \/#@T
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package com.tot.count; e\L8oOk#r
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/** )SGq[B6@I
* }|=|s f
* @author rx|pOz,:
*/ 4V`G,W4^J
public class CountBean { 5.GR1kl6
private String countType; 'H;*W |:-]
int countId; evmeqQG=
/** Creates a new instance of CountData */ ^1];S^nD
public CountBean() {} G 3ptx!
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public void setCountType(String countTypes){ @j/a=4o[
this.countType=countTypes; s$j,9uRr
} InI$:kJ
public void setCountId(int countIds){ ww1[rCh\+
this.countId=countIds; :V||c 5B+
} d2$IH#~9B
public String getCountType(){ OneY_<*a<
return countType; Q=$2c[Uk
} J|7 3.&B
public int getCountId(){ >hIu2jm
return countId; &};zvo~P.
} +NUG
} nxFBI D
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CountCache.java kAUymds;O
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/* !4+<<(B=E
* CountCache.java 1'Dai `
* p!%pP}I
* Created on 2007年1月1日, 下午5:01 G3T]`Atf
* |[8Th4*n
* To change this template, choose Tools | Options and locate the template under 9\(|
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* the Source Creation and Management node. Right-click the template and choose Q3?F(ER@
* Open. You can then make changes to the template in the Source Editor. z
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*/ Q"#J6@
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package com.tot.count; 4*;MJ[|
import java.util.*; K|=A:
/** q)
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* !&E-}}<
* @author W(p_.p"
*/ Ow,b^|
public class CountCache { 8z\xrY
public static LinkedList list=new LinkedList(); ]Hv[ IodJ
/** Creates a new instance of CountCache */ J'r^/
public CountCache() {} 8u]2xB=K
public static void add(CountBean cb){ F!K>K z
if(cb!=null){ lyhiFkO
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list.add(cb); _aeBauD
} Vxt+]5X
} (QB2T2x
} MolgwVd
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CountControl.java BMf@M
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/* fc>L K7M
* CountThread.java 7G],T++N
* klhtKp_p
* Created on 2007年1月1日, 下午4:57 2Tppcj v
* [2cD:JL
* To change this template, choose Tools | Options and locate the template under _@/8gPT*i
* the Source Creation and Management node. Right-click the template and choose k9F=8q
* Open. You can then make changes to the template in the Source Editor. /Z4et'Lo
*/ ,hmL/K0"(5
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package com.tot.count; sDV Q#}a
import tot.db.DBUtils; V(*(F7+
import java.sql.*; cB&:z)i4
/** zbPqYhJzA
* RD&PDXT4
* @author \73ch
*/ apxph2yvS
public class CountControl{ u]@['7
private static long lastExecuteTime=0;//上次更新时间 wz8yD8M
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ^<AwG=
/** Creates a new instance of CountThread */ +"VP-s0
public CountControl() {} +"@ .8m
public synchronized void executeUpdate(){ (7*}-Uy[C
Connection conn=null; 6W
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PreparedStatement ps=null; Gs[XJ 5%`~
try{ @KAI4LP
conn = DBUtils.getConnection(); #.[k=dj
conn.setAutoCommit(false); 3;Fhg!ZO
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); :BTq!>s
for(int i=0;i<CountCache.list.size();i++){ syK^<xa
CountBean cb=(CountBean)CountCache.list.getFirst(); TS5Q1+hWHV
CountCache.list.removeFirst(); @lph)A Nk
ps.setInt(1, cb.getCountId()); k VQ\1!
ps.executeUpdate();⑴ rrv%~giU
//ps.addBatch();⑵ vfo~27T{(
} [ikOb8 G#
//int [] counts = ps.executeBatch();⑶ xId.GWY1
conn.commit(); KK &?gTa
}catch(Exception e){ A5w6]: f2
e.printStackTrace(); p()xz
} finally{ Du){rVY^d
try{ Lj;2\]
if(ps!=null) { `9.r`&T6K
ps.clearParameters(); H>@+om
ps.close(); nFs(?Rv*
ps=null; g=o4Q<
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} WjqO@]P6
}catch(SQLException e){} v*yuE5{
DBUtils.closeConnection(conn); |zE'd!7E
} h)nG)|c
} "
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public long getLast(){ FxtI"g\0
return lastExecuteTime; POR\e|hRT]
} VLN_w$iEq
public void run(){ !{41!O,K#
long now = System.currentTimeMillis(); G*v,GR
if ((now - lastExecuteTime) > executeSep) { ?0xgRe<
//System.out.print("lastExecuteTime:"+lastExecuteTime); &jr3B;g!C
//System.out.print(" now:"+now+"\n"); KY]C6kh
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); N,U8YO
lastExecuteTime=now; ;jTN| i'
executeUpdate(); W*w3[_"sr
} WMP,\=6k0
else{ kO-(~];
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); S 6,.FYH
} B?o7e<l[
} Xb,3Dvf
} BFW&2
//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 +d-NL?c
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类写好了,下面是在JSP中如下调用。 76` .Y
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<% ei5~&
CountBean cb=new CountBean(); n?K
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^/=KK:n~
CountCache.add(cb); k-""_WJ~^
out.print(CountCache.list.size()+"<br>"); 7j)8Djzp|
CountControl c=new CountControl(); W`*r>`krVJ
c.run(); /5AJ.r
out.print(CountCache.list.size()+"<br>"); lB[kbJ
%>