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: 14 ,t
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CountBean.java q`/J2r+O
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/* zG<<MR/<
* CountData.java tuIZYp8tIN
* lya},_WCq
* Created on 2007年1月1日, 下午4:44 p&x!m}!
* _J!&R:]$
* To change this template, choose Tools | Options and locate the template under hHmm(~5gR
* the Source Creation and Management node. Right-click the template and choose vm[*+&\2
* Open. You can then make changes to the template in the Source Editor. |u?VlRt
*/ &K60n6q{aQ
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package com.tot.count; *|g[Mn
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/** m{=Q88k!@.
* -*4*hHmb
* @author Ms,MXJtH
*/ ?R#$
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public class CountBean { nOL.%
private String countType; Z3hZy&_I
int countId; _3@5@1[s
/** Creates a new instance of CountData */ x1#>"z7
public CountBean() {} Nz.X$zUmY
public void setCountType(String countTypes){ Rr%x;-
this.countType=countTypes; )Ln".Bu,
} ciN\SA ZY
public void setCountId(int countIds){ O#ZZ PJ"
this.countId=countIds; GW;%~qH[,
} ceE]^X;p
public String getCountType(){ zaHZ5%{LQD
return countType; lP`BKc,
} ]/1\.<uJId
public int getCountId(){ ').)0;
return countId; }q@#M8 b
} |K Rt$t
} ;\2Z?Kq
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CountCache.java c**&, aL
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/* RSym9t90t
* CountCache.java i m;6$3
* !Yb !Au[
* Created on 2007年1月1日, 下午5:01 8i`>],,ch
* $N)G:=M!s
* To change this template, choose Tools | Options and locate the template under zVw5 (Tc
* the Source Creation and Management node. Right-click the template and choose rMx Iujx
* Open. You can then make changes to the template in the Source Editor. ulIEx~qP
*/ NUltuM
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package com.tot.count; '1ySBl1>
import java.util.*; X n!mdR
/** _=s9o/Cn]
* ~h@@y5<4
* @author 6I@j$edZ
*/ Gm Wr
public class CountCache { >Dr(%z6CN
public static LinkedList list=new LinkedList(); WZNq!K H
/** Creates a new instance of CountCache */ vNGE]+QX
public CountCache() {} <@-O06
public static void add(CountBean cb){ .
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if(cb!=null){ E:pk'G0bZ
list.add(cb); `sCaGCp
} ,-y9P
} XJ4f;U
} g;63$_<
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CountControl.java kKSGC?d
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/* ;3cbXc@]
* CountThread.java eTS}-
* $5&%X'jk
* Created on 2007年1月1日, 下午4:57 ^r\rpSN
* ;yt6Yp.6e
* To change this template, choose Tools | Options and locate the template under E?XaU~cpc
* the Source Creation and Management node. Right-click the template and choose !RmVb}m
* Open. You can then make changes to the template in the Source Editor. &ry*~"xoh
*/ 9Lb96K?=>
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package com.tot.count; CjQO5
import tot.db.DBUtils; [b3!H{b#
import java.sql.*; \#9LwC"8;
/** MuY:(zC%
* %PYl
* @author crM5&L9zF
*/ 4!Js="
public class CountControl{ %hnBpz
private static long lastExecuteTime=0;//上次更新时间 r<+C,h;aww
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 A#"Wk]jX
/** Creates a new instance of CountThread */ ,5n!a.T
public CountControl() {} C$y6^/7)
public synchronized void executeUpdate(){ >D,Oav
Connection conn=null; QQ3<)i
PreparedStatement ps=null; Ap
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try{ ebk>e*
conn = DBUtils.getConnection(); EU?qLj':
conn.setAutoCommit(false); {[oNUzcd
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); qk (Eyp
for(int i=0;i<CountCache.list.size();i++){ \3 SY2g8+
CountBean cb=(CountBean)CountCache.list.getFirst(); nj[TTndJt
CountCache.list.removeFirst(); `>:5[Y
ps.setInt(1, cb.getCountId()); .{1$;K @
ps.executeUpdate();⑴ h&<"jCjL
//ps.addBatch();⑵ $xbC^ k
} %v0M~J}+
//int [] counts = ps.executeBatch();⑶ XNYA\%:5S
conn.commit(); OpUfK4U)
}catch(Exception e){ (0$~T}lH
e.printStackTrace(); _ .v G)
} finally{ ,"%C.9a
try{ &BVHQ7[
if(ps!=null) { g&Vhu8kNIA
ps.clearParameters(); }Ce9R2
ps.close(); 7OV^>"S
ps=null; 8MJJ w;
} ;p(h!4E
}catch(SQLException e){} hLO)-ueb
DBUtils.closeConnection(conn); ,-pE/3|(
} PF{uaKWk
} /7AHd ;
public long getLast(){ -/Q5?0z
return lastExecuteTime; HXLnjXoe
} NdXHpq;
public void run(){ KYFKH+d>m
long now = System.currentTimeMillis(); 7H6Ts8^S
if ((now - lastExecuteTime) > executeSep) { "<CM'R
//System.out.print("lastExecuteTime:"+lastExecuteTime); }.&nEi`
//System.out.print(" now:"+now+"\n"); clE9I<1v
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); VeA@HC`?"
lastExecuteTime=now; 2f,8Jnia
executeUpdate(); ='7m$,{(Q[
} -$d?e%}#
else{ c#OxI*,+/
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ? x%s
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} b;i*}4h!
} jBLTEb
} :@L7RZ`_
//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 z74JyY
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类写好了,下面是在JSP中如下调用。 k<9,Ypa
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<% !nmZ"n|}p
CountBean cb=new CountBean(); P3oYk_oW
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); bxXpw&
CountCache.add(cb); ,1-%C)
out.print(CountCache.list.size()+"<br>"); 2q?/aw ;Z
CountControl c=new CountControl(); k[Em~>m
c.run(); !sT>]e
out.print(CountCache.list.size()+"<br>"); &h5Vhzq(<
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