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: c#'t][Ii
MVdX
CountBean.java 8Jnb/A}
olc7&R
/* P|,@En 1!
* CountData.java 13
`Or(>U
* ;&mefaFlWp
* Created on 2007年1月1日, 下午4:44 9[yW&t;#
* i("ok
* To change this template, choose Tools | Options and locate the template under \;&WF1d`ac
* the Source Creation and Management node. Right-click the template and choose v@_}R_pX
* Open. You can then make changes to the template in the Source Editor. A")F7F31c
*/ .Jk[thyU
wrw4Uxq
package com.tot.count; #{-l(016y
X@l>mAk
/** /)6+I(H
* z%ZAN-
* @author $oF0[ }S
*/ \0gU)tVZ
public class CountBean { #-T xhwYs
private String countType; SUv(MA&
int countId; -U&k%X
/** Creates a new instance of CountData */ N]yh8"7X
public CountBean() {} 62L,/?`B$
public void setCountType(String countTypes){ ~kHWh8\b:
this.countType=countTypes; +5AWX,9,-
} 2G=prS`s
public void setCountId(int countIds){ 3a|I| NP
this.countId=countIds; C/34K(
} )96tBA%u
public String getCountType(){ ,2yIKPWk
return countType; Y52f8qQq
} Whd.AaD\
public int getCountId(){ ks3ydHe`
return countId; pNt,RRoR
} +!"GYPUXy
} t4Q&^AC
4$~A%JN3
CountCache.java _tba:a(
:v$][jZ2
/* QOT|6)Yb
* CountCache.java N [qNSo|
* UnVYGch
* Created on 2007年1月1日, 下午5:01 &9j*Y
* ]Lb Fh5;s
* To change this template, choose Tools | Options and locate the template under :OEovk(`
* the Source Creation and Management node. Right-click the template and choose ?^}
z
* Open. You can then make changes to the template in the Source Editor. NuEcTww
*/ z^,P2kqK_
NCX`-SLv
package com.tot.count; uO^,N**R#
import java.util.*; UlNx5l+k
/** P7`RAz
* .]XBJc
* @author xI>HY9i)
*/ rbw~Ml0
public class CountCache { /#Gm`BT
public static LinkedList list=new LinkedList(); ->9waXRDz)
/** Creates a new instance of CountCache */ r]3v.GZy
public CountCache() {} yg WwUpY
public static void add(CountBean cb){ HrK7qLw7
if(cb!=null){ 'hNRIM1
list.add(cb); 3UgPVCT
} APUpqY
} E51'TT9
} ET\>cxSp
MwE^.6xl{
CountControl.java ?{]"UnyVE*
[1Q:
/* tq.g4X ;_
* CountThread.java iezY+`x4
* c~)H" n
* Created on 2007年1月1日, 下午4:57 #,S0uA
* WR zIK09@
* To change this template, choose Tools | Options and locate the template under mV;)V8'
* the Source Creation and Management node. Right-click the template and choose GswV/V+u
* Open. You can then make changes to the template in the Source Editor. rCsH
0:l8P
*/ 1SG^g*mf
zgPUW z
X=
package com.tot.count; K)P].htw
import tot.db.DBUtils; Q`HG_n@?
import java.sql.*; *@E&O^%cO
/** S{S.H?{F
* 9Itj@ps
* @author jc7NYoT:
*/ i:sb_U+M
public class CountControl{ AiUK#I
private static long lastExecuteTime=0;//上次更新时间 0czEA
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 h,x'-]q
/** Creates a new instance of CountThread */ CuAA)B j
public CountControl() {} w1,6%?p(O
public synchronized void executeUpdate(){ fctVJ{?
Connection conn=null; ,3bAlc8D7
PreparedStatement ps=null; FQBAt0
try{ zuYz"-(L
conn = DBUtils.getConnection(); +`+r\*C5
conn.setAutoCommit(false); s}Q*zy
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); MB"<^ZX
for(int i=0;i<CountCache.list.size();i++){ V~4yS4
CountBean cb=(CountBean)CountCache.list.getFirst(); qVr?st
CountCache.list.removeFirst(); K)nn;j=
ps.setInt(1, cb.getCountId()); T?EFY}f
ps.executeUpdate();⑴ Ji;R{tZ.R
//ps.addBatch();⑵ (k<__W c_t
} 2|}KBny
//int [] counts = ps.executeBatch();⑶ I7HP~v~
conn.commit(); 0ChdFf7
}catch(Exception e){ :=2l1Y[-G
e.printStackTrace(); i4\m/&of3y
} finally{ g6(u6%MD
try{ \"=b8x
if(ps!=null) { L<O"36R
ps.clearParameters(); *S\/l-D
ps.close(); [|dQZ
ps=null; 4qmaL+Q
} H<C+rAIb
}catch(SQLException e){} {GKq Ou
DBUtils.closeConnection(conn); Bw*6X`'Q
} N-<m/RS
} f}?q
public long getLast(){ ca?;!~%zA
return lastExecuteTime; 50Y^##]&
} @Yzc?+x
public void run(){ pb=yQ}.
long now = System.currentTimeMillis(); 707-iLkt.1
if ((now - lastExecuteTime) > executeSep) { ZY{zFg9
//System.out.print("lastExecuteTime:"+lastExecuteTime); X8| 0RU@f
//System.out.print(" now:"+now+"\n"); N
Uq'96{Y
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
>TQnCG=
lastExecuteTime=now; =d`/BDD
executeUpdate(); q3$;lLsb;j
} iVqa0Gl+}
else{ 5Q.z#]Lg
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :}}~ $$&
} d}_%xkC
} Hsi<!g.
} 3m59EI-p
//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 /%5X:*:H
kK il]L
类写好了,下面是在JSP中如下调用。 k=r)kkO)
HE>sZ;
<% H_+F~P5RC
CountBean cb=new CountBean(); d vTsbs/6
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); @gHWU>k,A
CountCache.add(cb); SM@RELA'Lb
out.print(CountCache.list.size()+"<br>"); ^VAvQ(b!:i
CountControl c=new CountControl(); #Hy fjj
c.run(); 268H!'!\
out.print(CountCache.list.size()+"<br>"); 990sE
t?
%>