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: YY:iPaGO
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CountBean.java Fm$n@RbX
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/* h w ;d m
* CountData.java *T>#zR{
* ;8L+_YCa
* Created on 2007年1月1日, 下午4:44 ?%dCU~ z
* L\:YbS~]
* To change this template, choose Tools | Options and locate the template under i. u15$
* the Source Creation and Management node. Right-click the template and choose Ag>>B9
* Open. You can then make changes to the template in the Source Editor. 8?j&{G
*/ ;sL6#Go?V
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package com.tot.count; -wtTq
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/** 1!;"bHpk
* s;_#7x#
* @author 3\p]esse
*/ p~,3A:i
public class CountBean { zfjD b
private String countType; t)oES>W1
int countId; (ciGLfNG
/** Creates a new instance of CountData */ }uvKE|umj
public CountBean() {} U|
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public void setCountType(String countTypes){ 4lY&=_K[)
this.countType=countTypes; 0l(E!d8&'
} 2yJ7]+Jd7Y
public void setCountId(int countIds){ p9&gEW
this.countId=countIds; 3)C6OF>7
} OP|.I._I
public String getCountType(){ xyS2_Q
return countType; 8V=HyF#
} lrmt)BLoh
public int getCountId(){ f>s#Ngvc
return countId; 2w x[D
} ~b>nCP8q
} c<+g|@A#
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CountCache.java GFQG(7G9
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/* u,Q_WR-wJ
* CountCache.java JO&;bT<
* aR="5{en{:
* Created on 2007年1月1日, 下午5:01 {hs2?#p
* , `[Z`SUk`
* To change this template, choose Tools | Options and locate the template under Ypn%[sSOp
* the Source Creation and Management node. Right-click the template and choose >tmnj/=&
* Open. You can then make changes to the template in the Source Editor. S<y>Y
*/ I5TQ>WJbf
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package com.tot.count; CzzUi]*Ac{
import java.util.*; w|
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/** lnS\5J
* R<y Nv
* @author ,`%k'ecN
*/ 6:|!1Pg5
public class CountCache { <i{m.pR>
public static LinkedList list=new LinkedList(); 8`AcS|k
/** Creates a new instance of CountCache */ 9&[)(On74
public CountCache() {} Yn IM-
public static void add(CountBean cb){ ~>N`<S
if(cb!=null){ mc0sdb,c$
list.add(cb); 1BMV=_
} tf$PaA
} 12:h49AP
} [0% yJH
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CountControl.java @b::6n/u
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/* PSP1>-7)w
* CountThread.java Zzw}sZ?8
* 5(iSOsb
* Created on 2007年1月1日, 下午4:57 IKMsY5i
* 36kc4=
* To change this template, choose Tools | Options and locate the template under QoW(tM
* the Source Creation and Management node. Right-click the template and choose dT0^-XSY
* Open. You can then make changes to the template in the Source Editor. vWqyZ-p,q
*/ vI
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package com.tot.count; \yJZvhUk
import tot.db.DBUtils; v{mv*`~nA\
import java.sql.*; EFa{O`_@U
/** P|unUW(P
* "xe7Dl
* @author Dh\S`nfFq
*/ S\!
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public class CountControl{ dxzvPgi?
private static long lastExecuteTime=0;//上次更新时间 26\HV
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 p<of<YU)
/** Creates a new instance of CountThread */ ]Wy^VcqX
public CountControl() {} ql{^"8x
public synchronized void executeUpdate(){ =R8f)UQYx
Connection conn=null; (ZE%tbm2
PreparedStatement ps=null; $Q`yNEc
try{ -,K*~z.l
conn = DBUtils.getConnection(); 4 o3)*
conn.setAutoCommit(false); 6T^N!3p_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); oJlN.Q#u&
for(int i=0;i<CountCache.list.size();i++){ m+D2hK*
CountBean cb=(CountBean)CountCache.list.getFirst(); .;<7424(%
CountCache.list.removeFirst(); 1zb$5 {,|
ps.setInt(1, cb.getCountId()); !XgQJ7y_Z
ps.executeUpdate();⑴ Qq`3S>
//ps.addBatch();⑵ NDB*BmG
} SKB@
//int [] counts = ps.executeBatch();⑶ K?h[.`}
conn.commit(); (,- 5(fW
}catch(Exception e){ 2k.S[?)
e.printStackTrace(); cOzg/~\1
} finally{ *fxep08B
try{ q*HAIw[<y
if(ps!=null) { lEO?kn.:z
ps.clearParameters(); 0=N4O!X9
ps.close(); vbr~<JT=
ps=null; 'P@=/
} ucQezmie
}catch(SQLException e){} K:}h\ In
DBUtils.closeConnection(conn); (A7T}znG
} *)j@G:
} $x;tSJ)m~
public long getLast(){ Nf=C?`L
return lastExecuteTime; )x$!K[=
} y-E1]4?})
public void run(){ z7'n, [
long now = System.currentTimeMillis(); 2LCc
if ((now - lastExecuteTime) > executeSep) { Nbgp_:{
//System.out.print("lastExecuteTime:"+lastExecuteTime); $se !8s"
//System.out.print(" now:"+now+"\n"); N; rXl8
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); b*lKT]D,
lastExecuteTime=now; ::p-9F
executeUpdate(); ,DE(5iDS
} 'b LP~
else{ Eem 2qKj
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Ix( 6
} i
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} =^BqWC2~
} Zr\2BOcc.l
//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 >=4sPF)
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类写好了,下面是在JSP中如下调用。 w0#%AK
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<% II.<S C
CountBean cb=new CountBean(); kFS0i%Sr
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); j FgZ}Xp
CountCache.add(cb); cNdu.c[@
out.print(CountCache.list.size()+"<br>"); aF D="Zh
CountControl c=new CountControl(); 48lzOG
c.run(); @; W<dJ<X
out.print(CountCache.list.size()+"<br>"); eA`]KalH
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