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: (~ro_WC/I
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CountBean.java ? cU9~=
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/* .Qk T-12
* CountData.java ))m\d *
* RQhS]y@e
* Created on 2007年1月1日, 下午4:44 =p~k5k4
* tb36c<U-
* To change this template, choose Tools | Options and locate the template under \6AYx[|
* the Source Creation and Management node. Right-click the template and choose hB/4.K ]8
* Open. You can then make changes to the template in the Source Editor. a!rU+hiC
*/ __N<
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package com.tot.count; [w*YH5kX
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/** LkYcAY$w
* |j:"n3~6
* @author }2c)UQD8
*/ WjLy7&
public class CountBean { $Y'}wB{pc
private String countType; F6XrJ?JM
int countId; 7[=*#7}.
/** Creates a new instance of CountData */ e$kBpG"D
public CountBean() {} c"HB7
public void setCountType(String countTypes){ `o|Y5wQ@
this.countType=countTypes; <% #Dwo}
} xVYy`_|
public void setCountId(int countIds){ F[am2[/<A
this.countId=countIds; NMJX `
} w]<V~X
public String getCountType(){ V$wW?+V
return countType; LF6PKS
} CVUA7eG+
public int getCountId(){ ]mIcK
return countId; 8i$quHd&x
} Xa o*h(Q@L
} ,',
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CountCache.java W^dk:
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/* TOF_m$@#
* CountCache.java 4mHR+SZy
* V9KI?}q:W
* Created on 2007年1月1日, 下午5:01 5PF?Eq
* K|^PHe
* To change this template, choose Tools | Options and locate the template under 80J87\)
* the Source Creation and Management node. Right-click the template and choose _A]8l52pt
* Open. You can then make changes to the template in the Source Editor. 7Yv1et
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*/ rgq~lZ.U4K
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package com.tot.count; .+ezcG4q
import java.util.*; Oly"ll*K
/** Y7*8 A,
* 6gfn5G
* @author A]<+Aq@{
*/ )ZZjuFQJ)
public class CountCache { wPr9N}rf
public static LinkedList list=new LinkedList(); Ygeg[S!7
/** Creates a new instance of CountCache */ 8M6
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public CountCache() {} t)qu@m?FZ)
public static void add(CountBean cb){ HpLCOY1-
if(cb!=null){ 9j94]w2v
list.add(cb); stxei
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} h D5NX
} ^Pwtu
} TA4>12C6
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CountControl.java Zc!rL0T
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/* qb$&BZj]|
* CountThread.java T'^ Do/
* ) |t;nK,
* Created on 2007年1月1日, 下午4:57 y<9' 3\
*
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* To change this template, choose Tools | Options and locate the template under q\DN8IJ
* the Source Creation and Management node. Right-click the template and choose IL0e:-@!0
* Open. You can then make changes to the template in the Source Editor. hw5NHZ I'
*/ z:Y
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package com.tot.count; ,|}}Ml
import tot.db.DBUtils; yN@3uYBF
import java.sql.*; C4[) yJ
/** c/6
* ;{L ~|q J
* @author <6.aSOS
*/ 7y?aw`Sw:
public class CountControl{ |lDxk[
private static long lastExecuteTime=0;//上次更新时间 b#%$y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -s3q(SH
/** Creates a new instance of CountThread */ Wg5<@=x!G
public CountControl() {} UWXl
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public synchronized void executeUpdate(){ 02$d
Connection conn=null; q"@>rU4
PreparedStatement ps=null; ayGcc`
try{ nmo<t]
conn = DBUtils.getConnection(); `{KdmWhW
conn.setAutoCommit(false); @> |3d
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); &xWej2a!
for(int i=0;i<CountCache.list.size();i++){
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CountBean cb=(CountBean)CountCache.list.getFirst(); n 9>**&5L
CountCache.list.removeFirst(); G'U ! #
ps.setInt(1, cb.getCountId()); V?L8BRnV
ps.executeUpdate();⑴ "M;aNi^B
//ps.addBatch();⑵ fEo5j`}
} 8@ZZ[9kt
//int [] counts = ps.executeBatch();⑶ T)Y{>wT
conn.commit(); Qx")D?u
}catch(Exception e){ 79*f <Gr
e.printStackTrace(); 9 _oAs"w
} finally{ .vnQZ*6
try{ Te6cw+6
if(ps!=null) { 39qIoaHT
ps.clearParameters(); ]5O]=^
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ps.close(); ^?V9
ps=null; Z g.La<#
} 6!Q,XHs
}catch(SQLException e){} 7gc?7TM
DBUtils.closeConnection(conn); ZX8AB
} 9,?7mgZp
} un F=";9H
public long getLast(){ y3 "+4e
return lastExecuteTime; 5La' I7q
} ^qY?x7mx1
public void run(){ eH_< <Xh!v
long now = System.currentTimeMillis(); XfQK
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if ((now - lastExecuteTime) > executeSep) { L`"j>),
//System.out.print("lastExecuteTime:"+lastExecuteTime); ( 5 BZZ
//System.out.print(" now:"+now+"\n"); aGAeRF
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); |}o6N5)
lastExecuteTime=now; PX- PVW
executeUpdate(); 8w$q4fg0
} V7"^.W*
else{ F{G.dXZZ<
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); zCdcwTe
} p:;`X!
} _Rb>py
} Xqy9D ZIn
//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 LO;?#e7
1EMud,,:
类写好了,下面是在JSP中如下调用。 K`0'2
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<% ]7{
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CountBean cb=new CountBean(); L.s$|%
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); F.{$HJ
CountCache.add(cb); msVi3`q~
out.print(CountCache.list.size()+"<br>"); {%oxzdPc
CountControl c=new CountControl(); DJZ$M
c.run(); sOO_J!bblP
out.print(CountCache.list.size()+"<br>"); - i#Kpf
%>