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: lkf(t&vL2
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CountBean.java :ho)3kB
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/* eR r.j
* CountData.java 0$3\DS<E
* QRj><TKi
* Created on 2007年1月1日, 下午4:44 {aI8p}T
* r]eeKV,{p
* To change this template, choose Tools | Options and locate the template under 6#XB'PR2p
* the Source Creation and Management node. Right-click the template and choose ODK$G
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* Open. You can then make changes to the template in the Source Editor. Y:C7S~
*/ OKfJ
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package com.tot.count; !oeu
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/** orn9;|8q
* oxE'u<
* @author ;crQ7}k
*/ ;bVC7D~~4w
public class CountBean { ig:/60Z
private String countType; ]gYnw;W$
int countId; 2Yt#%bj7^
/** Creates a new instance of CountData */ 5EDN 9?a
public CountBean() {} o{yEF1,c\
public void setCountType(String countTypes){ FL!W oTB
this.countType=countTypes; 5T;M,w6DV
} ;cl\$TDL
public void setCountId(int countIds){ Uw^`_\si
this.countId=countIds; Zrp`91&I
} 6_/691
public String getCountType(){ Tl=cniy]
return countType; e Ll+F%@
} |ofegO}W7
public int getCountId(){ -x2/y:q `
return countId; 5k.NZ
} eRQ}`DjTk
} 7
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CountCache.java yfeX=h
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/* Ddde,WJA
* CountCache.java ~H/|J^ J
* yiGq?WA7
* Created on 2007年1月1日, 下午5:01 naCPSsei
* 2bxkZS]
* To change this template, choose Tools | Options and locate the template under * ]~ug%a
* the Source Creation and Management node. Right-click the template and choose tVd\ r"0k
* Open. You can then make changes to the template in the Source Editor. D8N}*4S
*/ 5Z}]d@
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package com.tot.count; n'=-bj`
import java.util.*; (&0%![j&
/** A_1cM#4
* d_=@1JM>
* @author 8R Wfv}:X
*/ GwxxW
public class CountCache { ')t
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public static LinkedList list=new LinkedList(); }$3eRu +
/** Creates a new instance of CountCache */ K^`3Bg
public CountCache() {} j?%^N\9
public static void add(CountBean cb){ '/U[ ui0{
if(cb!=null){ ~n%~ Z|mMF
list.add(cb); xaSvjc\
} 5bM/
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} Zpg/T K
} X=_pQ+j`^
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CountControl.java gO%#'Eb2
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/* C%d\DuJ5'~
* CountThread.java
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* S!<YVQq
* Created on 2007年1月1日, 下午4:57 lxy_O0n
* |t*(]U2O0
* To change this template, choose Tools | Options and locate the template under t
m?[0@<s
* the Source Creation and Management node. Right-click the template and choose n"8vlNeW
* Open. You can then make changes to the template in the Source Editor. IY6DZP
*/ 24PEt%2
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package com.tot.count; /e :V44
import tot.db.DBUtils; >f #P(
import java.sql.*; w~a^r]lPW
/** PVHJIB
* *LpEH,J
* @author >_P7 k5Y^
*/ D-e0q)RSU
public class CountControl{ G%w.Z< qy
private static long lastExecuteTime=0;//上次更新时间 )orVI5ti
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 lP& 7U
/** Creates a new instance of CountThread */ :8aa #bA
public CountControl() {} ^%|,G:r
public synchronized void executeUpdate(){ OQMkpX-dH
Connection conn=null; I&~kwOP
PreparedStatement ps=null; \Zz"%i
try{ 0 3fCn"
conn = DBUtils.getConnection(); exw~SvT3
conn.setAutoCommit(false); ,gGIkl&
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); t-Rfy`I3
for(int i=0;i<CountCache.list.size();i++){ D7|[:``
CountBean cb=(CountBean)CountCache.list.getFirst(); (n+2z"/
CountCache.list.removeFirst(); OJiW@Z_\
ps.setInt(1, cb.getCountId()); RY'f%c
ps.executeUpdate();⑴ _@9[c9bO
//ps.addBatch();⑵ kcKcIn{
} \"Z^{Y[,;
//int [] counts = ps.executeBatch();⑶ AE`X4 q
conn.commit(); i2KN^"v?N
}catch(Exception e){ '?dO[iQ$:
e.printStackTrace(); D+ mZ7&L
} finally{ 2g~qVT,
try{ RUqN,C,m5I
if(ps!=null) { i'9aQi"G
ps.clearParameters(); >p#` %S
ps.close(); %jz]s4u$5j
ps=null; 0fwmQ'lW(
} )QYg[<e6
}catch(SQLException e){} )[RLCZ
DBUtils.closeConnection(conn); koOkm:(,
} $U%M]_
} Y,Dd}an
public long getLast(){ 3qJOE6[}%
return lastExecuteTime; ITJ{]7N
} BrF/-F
public void run(){ nMXk1`|/)x
long now = System.currentTimeMillis(); .GcIwP'aU-
if ((now - lastExecuteTime) > executeSep) { ^hq+
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//System.out.print("lastExecuteTime:"+lastExecuteTime); |/<,71Ae
//System.out.print(" now:"+now+"\n"); %B?@le+%
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); >B>[_8=f@
lastExecuteTime=now; I?`}h}7.
executeUpdate(); j8n_:;i*
} O b'B?
else{ ]-[M&i=+&
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :5Vk+s]8
}
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} xi['knUi2-
} J1OZG6|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 G8=2=/ !
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类写好了,下面是在JSP中如下调用。 ZoX24C'
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<% HVO
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CountBean cb=new CountBean(); n%'M?o]DF
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); D. d( D:
CountCache.add(cb); ZrY#B8
out.print(CountCache.list.size()+"<br>"); p}q27<O*/
CountControl c=new CountControl(); $ N`V%<W
c.run(); 9U[Gh97Sf
out.print(CountCache.list.size()+"<br>"); |dIP &9
%>