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: 61
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CountBean.java [PKR2UEe]
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/* H 7
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* CountData.java D|#E9OQzs
* o%*xvH*A
* Created on 2007年1月1日, 下午4:44 6\S~P/PkE
* 2VCI 1E
* To change this template, choose Tools | Options and locate the template under *HB-QIl
* the Source Creation and Management node. Right-click the template and choose &]-DqK7
* Open. You can then make changes to the template in the Source Editor. *4_Bd=5(U
*/ s(roJbJ_;
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package com.tot.count; dGTsc/$
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/** O<W_fx8_'
* -s'-eQF J
* @author K 'I#W
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*/ pFz`}?c0
public class CountBean { 8sK9G`
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private String countType; uA#;G/$
int countId; {cw /!B
/** Creates a new instance of CountData */ k.15CA`
public CountBean() {} maR"t+
public void setCountType(String countTypes){ cPc</[x[W
this.countType=countTypes; _n\GNUA
} {2"zVt#h
public void setCountId(int countIds){ ~.lPEA %%
this.countId=countIds; jm r"D>
} Q.c\/&
public String getCountType(){ )sQ*Rd@t[8
return countType; J!7MZLb
} m<2M4u
public int getCountId(){ BJo*'US-Q
return countId;
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} , SnSW-P
} K,:N
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CountCache.java t5IEQ2
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/* '(jG[ry&T
* CountCache.java [;myHI`tw
* QnX(V[
* Created on 2007年1月1日, 下午5:01 %C_HXr@
* 0S$N05
* To change this template, choose Tools | Options and locate the template under =zs`#-^8
* the Source Creation and Management node. Right-click the template and choose t9IW/Q
* Open. You can then make changes to the template in the Source Editor. 57'4ljvYi
*/ 2jCf T>`3
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package com.tot.count; H~z`]5CN
import java.util.*; PRE|+=w$
/** 6Sn .I1Wy
* QUQ'3
* @author `,*5wBC
*/ 1D!<'`)AY
public class CountCache { #@nezu2
public static LinkedList list=new LinkedList(); LC!bIm5'
/** Creates a new instance of CountCache */ }|5Pr(I
public CountCache() {} m/EFHS49
public static void add(CountBean cb){ 4#hSJ(~7S
if(cb!=null){ cDkf qcC
list.add(cb); V,N%;iB}
} t}tEvh
} G?Hdq;
} ~gRf:VXX=_
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CountControl.java ?#UO./ "
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/* )p%E%6p
* CountThread.java OJy#w{4
*
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* Created on 2007年1月1日, 下午4:57 CF5`-wj/#
* @cB$iP=Z4
* To change this template, choose Tools | Options and locate the template under ~z;FP$U
* the Source Creation and Management node. Right-click the template and choose =+d?x56
* Open. You can then make changes to the template in the Source Editor. 2*#|Nj=^
*/ sZF6h=67D
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package com.tot.count; v0jgki4t
import tot.db.DBUtils; ]
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import java.sql.*; /%A*aGyIc
/** I`4*+a'q&
* L4y4RG/SJ:
* @author Nf1-!u7
*/ k7usMVAA
public class CountControl{ QGmn#]w\\
private static long lastExecuteTime=0;//上次更新时间 SS.dY""89
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 <B8!.|19
/** Creates a new instance of CountThread */ 0b(N^$js'
public CountControl() {} xe&i^+i
public synchronized void executeUpdate(){ KRDmY+
Connection conn=null; q.`NtsW!\+
PreparedStatement ps=null; 5(HG|
try{ x{/g(r={}
conn = DBUtils.getConnection(); `$aZ0+
conn.setAutoCommit(false); )U{Qj5W+F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); NGO fb
for(int i=0;i<CountCache.list.size();i++){ K~uq,~
CountBean cb=(CountBean)CountCache.list.getFirst(); ,',o'2=!
CountCache.list.removeFirst(); #],&>n7'
ps.setInt(1, cb.getCountId()); F6flIG&h
ps.executeUpdate();⑴ i5,kd~%O
//ps.addBatch();⑵ >[=^_8M
} "vE4E|
//int [] counts = ps.executeBatch();⑶ E\pL!c
conn.commit(); :${HQd+
}catch(Exception e){ .];=Pu^
e.printStackTrace(); !5uGd`^I
} finally{ i9][N5\$
try{ t"/q]G5
if(ps!=null) { U2s /2 [.
ps.clearParameters(); 6 3,H{
ps.close(); =^ 50FI|
ps=null; <1\Nb{5
} *N'p~LJ
}catch(SQLException e){} **gXvTqI
DBUtils.closeConnection(conn); :y jKL^G>
} WWHoi{q
} Qhcu>ra
public long getLast(){ =D#bb<o
return lastExecuteTime; :$BCRQ
} H@8sNV/u
public void run(){ ':m,)G5&
long now = System.currentTimeMillis(); ly3\e_z:G
if ((now - lastExecuteTime) > executeSep) { HcSXsF
//System.out.print("lastExecuteTime:"+lastExecuteTime); mZ"4&U
//System.out.print(" now:"+now+"\n"); `t'W2X
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {
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lastExecuteTime=now; 0$fpIz
executeUpdate(); N `F~n%N
} 7 X'u6$i
else{ XaPV94
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); >y:,9;
} l u%}h7ng
} 9kS^Abtk
} CDR@
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//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 h/hmlnOQl
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类写好了,下面是在JSP中如下调用。 $F+ L Ds
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<% ~d*(=G
CountBean cb=new CountBean(); =uYYsC\T
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 2/=l|!JKLz
CountCache.add(cb); cI?8RF(;
out.print(CountCache.list.size()+"<br>"); +jnJ|h({
CountControl c=new CountControl(); 6?~"V
c.run(); G@jZ)2
out.print(CountCache.list.size()+"<br>"); :~N-.#
%>