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: #Ez>]`]TB
~v2_vEu}JX
CountBean.java kz+P?mopm
TfMuQ i'>
/* op[5]tjL
* CountData.java KyDQ<Dq&
* =6/0=a[
* Created on 2007年1月1日, 下午4:44 r..\(r
* *V>Iv/(
* To change this template, choose Tools | Options and locate the template under ]XU?Wg
* the Source Creation and Management node. Right-click the template and choose +DksWbD
* Open. You can then make changes to the template in the Source Editor. }9jy)gF*e
*/ \acjv|]
Uq7 y4zJ
package com.tot.count; +
6O5hZ
'a*tee ^RS
/** &c0U\G|j
* ZY=x$($f
* @author UT+B*?,h
*/ /9;)zI
public class CountBean { (@mvNlc:
private String countType; ?-Fp rC
int countId; ^b'|`R+~}
/** Creates a new instance of CountData */ G!@tW`HO
public CountBean() {} GYZzWN}U
public void setCountType(String countTypes){ (@~d9PvB>
this.countType=countTypes; !XQG1!|ww
} 2BEF8o]Np
public void setCountId(int countIds){ 90&ld :97
this.countId=countIds; In5'(UHW:
} eXUXoK=T
public String getCountType(){ : >4{m)
return countType; j$a,93P5
} Ar N *9
public int getCountId(){ a6fMx~
return countId; 8v_HIx0xu
} \_qiUvPf\
} tGe|@.!
g!i\AMG?
CountCache.java V07e29w
BJwPSKL
/* t=Tu-2,k
* CountCache.java ]HCu tq
* zaf%%
* Created on 2007年1月1日, 下午5:01 (pNA8i%=G
* =EgiV<6vcH
* To change this template, choose Tools | Options and locate the template under C|8.$s<
* the Source Creation and Management node. Right-click the template and choose J[du>1D
* Open. You can then make changes to the template in the Source Editor. s9?klJg
*/ a=T_I1
aovRm|aOo'
package com.tot.count; }>>lgW>n,;
import java.util.*; P'xq+Q
/** ojni+} >_
* 9;NR
* @author p=V (_
*/ vE^Hk!^
public class CountCache { L]I)E`s
public static LinkedList list=new LinkedList(); 5v<BB`XWp
/** Creates a new instance of CountCache */ _0<qS{RW
public CountCache() {} XOAZ
public static void add(CountBean cb){ .A//Q|ot!
if(cb!=null){ <: f jWy
list.add(cb); dnSjXyjFB
} Ni7~
Mjjt
} "WV]|
TS"]
} q4C$-W%rj
HNu/b)-Rb
CountControl.java <p;cR` %uE
[/.o>R#J(
/* 9X/c%:)\=
* CountThread.java uW},I6g
* Y1vl,Yi
* Created on 2007年1月1日, 下午4:57 u|z B\zd
* $fR[zBxA
* To change this template, choose Tools | Options and locate the template under L&H4fy!>
* the Source Creation and Management node. Right-click the template and choose |f#~#Y2v
* Open. You can then make changes to the template in the Source Editor. CXwDG_e
*/ *W~+Nho.A
]#z^[XG
package com.tot.count; epqX2`!V
import tot.db.DBUtils;
s>~ h<B
import java.sql.*; +}@1X&v:
/** yS%IE>?
* BrcT`MM[(=
* @author I"eXoqh
*/ rZm|7A)i
public class CountControl{ h(*!s`1
private static long lastExecuteTime=0;//上次更新时间 { AdPC?R`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 gpB3\
/** Creates a new instance of CountThread */ Q&S\?cKe
public CountControl() {} $yS7u
public synchronized void executeUpdate(){ Rs_bM@
Connection conn=null; ]~iOO
%&R
PreparedStatement ps=null; 481J=8H
try{ q{?Po;\D
conn = DBUtils.getConnection(); }@>=,A4Y
conn.setAutoCommit(false); W7r1!/ccj
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); G'T/I\tB
for(int i=0;i<CountCache.list.size();i++){ gh>'O/9
CountBean cb=(CountBean)CountCache.list.getFirst(); <1cYz\/!M
CountCache.list.removeFirst(); *J&XM[t
ps.setInt(1, cb.getCountId()); LT']3w
ps.executeUpdate();⑴ l(
/yaZ`
//ps.addBatch();⑵ ^dj
avJ
} O+ ~.p
//int [] counts = ps.executeBatch();⑶ eAR]~
NiW
conn.commit(); Op%}.9 ed
}catch(Exception e){ H*BzwbM?
e.printStackTrace(); 8DHohhN
} finally{ +dIDFSd
try{ ('BFy>@
if(ps!=null) { ]"Z*Hq
z
ps.clearParameters(); +MU|XT_5|6
ps.close(); aUUr&yf_L
ps=null; ;dgxeP;mp
} #
Un>g4>Rh
}catch(SQLException e){} :I*G tq
DBUtils.closeConnection(conn); 7) aitDD
} AvnK?*5!@
} MW*@fl<@?M
public long getLast(){ +c$]Q-(
return lastExecuteTime; uSh!A
} %5.aC|^}
public void run(){ ,5J-C!C
long now = System.currentTimeMillis(); rjqQWfShY
if ((now - lastExecuteTime) > executeSep) { DdJ>1504
//System.out.print("lastExecuteTime:"+lastExecuteTime); B@XnHh5y
//System.out.print(" now:"+now+"\n"); ocOzQ13@Y
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); }+ ";W) R
lastExecuteTime=now; /cM<
executeUpdate(); j}}:&>;
} *[K\_F?^h
else{ Ct2m l
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Hg$t,\j
} ~u|k1
} C":i56
} wi]ya\(*yl
//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 t:y}
7un
7 $AEh+f
类写好了,下面是在JSP中如下调用。 <,/k"Y=
9ReH@5_bGM
<% Sz4G,c
CountBean cb=new CountBean(); (s`oJLW>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); P6q`i<
CountCache.add(cb); I!'PvIyO
out.print(CountCache.list.size()+"<br>"); AfAg#75q
CountControl c=new CountControl(); 3>LyEXOW
c.run(); U^+xCX<
out.print(CountCache.list.size()+"<br>"); D L0jA/f
%>