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: ~% ]V,-4
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CountBean.java ,@N.v?p>
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/* dKchQsgCg
* CountData.java q~AvxO
* vu*{+YpH
* Created on 2007年1月1日, 下午4:44 7n;a_Z0s$
* wc}x
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* To change this template, choose Tools | Options and locate the template under }+[!h=Bx
* the Source Creation and Management node. Right-click the template and choose Y<@_d
* Open. You can then make changes to the template in the Source Editor. 0,__{?!
*/ v )2yR~J
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package com.tot.count; f
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/** l`j@QP
* >E,/|K*
* @author n|QA\,=
*/ Cf<TDjU`|
public class CountBean { xw1,Wbu]
private String countType; EW)r/Av:,
int countId; kAxJ#RG
/** Creates a new instance of CountData */ 4l/~::y
public CountBean() {} .Z 17X_
public void setCountType(String countTypes){ 4h}\Kl
this.countType=countTypes; 5':j=KQE_
} h=NXU9n%'
public void setCountId(int countIds){ 4dSAGLpp
this.countId=countIds; 6,R<8a;Wn
} wmP[\^c%$j
public String getCountType(){ `"iPJw14
return countType; qX[C%
} LzB*d
public int getCountId(){ jM'Fb.>~
return countId; D2:ShyYAS
} %a-fxV[
} r"5\\ qf5*
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CountCache.java +fMW B
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/* ,
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* CountCache.java !E *IktAI
* r9-)+R
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* Created on 2007年1月1日, 下午5:01 `E>o:tff
* 9<Th: t|w
* To change this template, choose Tools | Options and locate the template under Y$3liDeL=
* the Source Creation and Management node. Right-click the template and choose " M&zW&
* Open. You can then make changes to the template in the Source Editor.
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*/ M|$A)D1
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package com.tot.count; b0/[+OY
import java.util.*; =D 5!Xq'|
/** CTX%~1_`O
* ].gC9@C:$i
* @author pl 1CEoe
*/ Lg6>\Z4
public class CountCache { vZSwX@0
public static LinkedList list=new LinkedList(); )YLZ"@
/** Creates a new instance of CountCache */ _p+q)#.W
public CountCache() {} xz/G$7q7
public static void add(CountBean cb){ .Ag)/Xm(?
if(cb!=null){ Oo%%f+
list.add(cb); u,@x7a,z
} X=JAyxY
} KH[Oqd
} J8`vk#5
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CountControl.java 8 A #\V
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/* Fw"x4w
* CountThread.java dC">AW
* IBv9xP]BZ
* Created on 2007年1月1日, 下午4:57 Sj4 @pMh4
* [#2z=Xg
* To change this template, choose Tools | Options and locate the template under \88IFE
* the Source Creation and Management node. Right-click the template and choose @,q<][q
* Open. You can then make changes to the template in the Source Editor. T:udw
*/ N8]d0
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package com.tot.count; u O~MT7~[X
import tot.db.DBUtils; Uw>g^[V;
import java.sql.*; E`3[62C
/** Z9PG7h
* ]<E\J+5K
* @author k5GJrK+
*/ eN
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public class CountControl{ uacVF[9|W
private static long lastExecuteTime=0;//上次更新时间 , @6_sl
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 eZRu{`AF*
/** Creates a new instance of CountThread */ J,wpY$93
public CountControl() {} ()@+QE$
public synchronized void executeUpdate(){ zDA;FKZPp
Connection conn=null; ,W;2A0A?X
PreparedStatement ps=null; y8O<_VOO}"
try{ c<g{&YJ
conn = DBUtils.getConnection(); j}DG +M
conn.setAutoCommit(false); p4wXsOQ}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 5A"OL6ty
for(int i=0;i<CountCache.list.size();i++){ ~FZ=
CountBean cb=(CountBean)CountCache.list.getFirst(); '\Hh
CountCache.list.removeFirst(); U_Va'7
ps.setInt(1, cb.getCountId()); sZ7BBJX2K
ps.executeUpdate();⑴ ob>2SU[Y
//ps.addBatch();⑵ jQ?6I1o
} >PiEu->P,
//int [] counts = ps.executeBatch();⑶ Tk0Senq,
conn.commit(); r}])V[V
}catch(Exception e){ Z6r_T
e.printStackTrace(); cH\.-5NQ
} finally{ L[ 7Aa"R
try{ u+vUv~4A6
if(ps!=null) { IqmoWn3
ps.clearParameters(); 0N*~"j;r#M
ps.close(); Yf,U2A\
ps=null; Y+#VzIZw
} 5i1Xumh 4
}catch(SQLException e){} ZZ{:f+=?$
DBUtils.closeConnection(conn); }Z}4_/E
} |B.tBt^
} '>5W`lZ
public long getLast(){ $[8GFv
return lastExecuteTime; @phb5
}
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public void run(){ Ucz`^}+
long now = System.currentTimeMillis(); PWThm ooP
if ((now - lastExecuteTime) > executeSep) { iOzY8M+N(
//System.out.print("lastExecuteTime:"+lastExecuteTime); L+y90 T6?
//System.out.print(" now:"+now+"\n"); Ce1^S[
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); yGtGhP8
lastExecuteTime=now; h48
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executeUpdate(); seEG~/U<
} 8!{F6DG
else{ zHvG3Ed@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); hbv>Jjd
} s@ vHU4
} 3]1uDgfr
} WfE,U=e*
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 I='S).
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类写好了,下面是在JSP中如下调用。 n$}Cj}eju
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<% %-eags~sUC
CountBean cb=new CountBean(); U#W9]il$
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); #Y;_W;#
CountCache.add(cb); 8 P=z"y
out.print(CountCache.list.size()+"<br>"); N
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CountControl c=new CountControl(); qkN{l88
c.run(); t1)Qa(#]
out.print(CountCache.list.size()+"<br>");
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%>