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: ^aB;Oo
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CountBean.java QZVyU8j3
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/* Z;uKnJh
* CountData.java 7KlL%\
* 8'Q+%{?1t
* Created on 2007年1月1日, 下午4:44 XZOBK^,5^B
* =78y*`L
* To change this template, choose Tools | Options and locate the template under .4a|^ vT
* the Source Creation and Management node. Right-click the template and choose QT%`=b
* Open. You can then make changes to the template in the Source Editor. Z?eTjkNS#
*/ NOTG|\{
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package com.tot.count; 5S4Nx>
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/** /R B%m8@;
* 7**zb"#y
* @author j0L%jz
*/ &b@_ah+f
public class CountBean { K>'4^W5d,
private String countType; xQZOGq
int countId; TIp\-
/** Creates a new instance of CountData */ .uA
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public CountBean() {} %`$bQU
public void setCountType(String countTypes){ >J9Qr#=H2
this.countType=countTypes; l iY/BkpH
} @g[ijs\
public void setCountId(int countIds){ Ov(k:"N
this.countId=countIds; ]4t1dVD
} Xn"#Zy_
public String getCountType(){ @lzq`SzM
return countType; 1jx?zvE,
} OFohyy(
public int getCountId(){ Tcy9oYh!Pn
return countId; &5HI
} CRo@+p10
} QO$18MBcc
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CountCache.java bzG vnaTt
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/* Lj /^cx
* CountCache.java eV_",W
* LiEEQ
* Created on 2007年1月1日, 下午5:01 b|87=1^m[
* 9+(b7L
* To change this template, choose Tools | Options and locate the template under %{ U (y#
* the Source Creation and Management node. Right-click the template and choose ]fY:+Ru
* Open. You can then make changes to the template in the Source Editor. :LuA6
*/ &v]xYb)+<
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package com.tot.count; f:8!@,I
import java.util.*; =&g:dX|q8
/** @[D5{v)S
* C,ldi"|
* @author lGet)/w;c
*/ ZW))Mx#K=T
public class CountCache { Mprn7=I{Tg
public static LinkedList list=new LinkedList(); *vNAm(\N
/** Creates a new instance of CountCache */ GfgHFv
public CountCache() {} &x (D%+
public static void add(CountBean cb){ iu=@h>C
if(cb!=null){ =glG |
list.add(cb); + $M<ck?Bo
} klmbbLce
} Cno[:iom
} uaD+G:{[
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CountControl.java yodhDSO5i
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/* M\ wCZG
* CountThread.java 5bZ0}^FYF
* JiqhCt\
* Created on 2007年1月1日, 下午4:57 rxxVLW
* Eb,M+c?
* To change this template, choose Tools | Options and locate the template under oVl:g:K40
* the Source Creation and Management node. Right-click the template and choose b 2\J<Nw
* Open. You can then make changes to the template in the Source Editor. eLH=PDdO
*/ A
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package com.tot.count; P{RGW.Ci@
import tot.db.DBUtils; k(`> (w
import java.sql.*; :S`12*_g"
/** {_>XsB
* UN<$F yb
* @author auB+ g'l
*/ ,*[N_[
public class CountControl{ bz1`f >%l
private static long lastExecuteTime=0;//上次更新时间 'Q*.[aJt
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2*W|s7cc
/** Creates a new instance of CountThread */ a'q&[08
public CountControl() {} 55b/giX
public synchronized void executeUpdate(){ Ct(^nn$A
Connection conn=null; "MPS&OK
PreparedStatement ps=null; ~Y1nU-
try{ 6d5q<C_3t
conn = DBUtils.getConnection(); iOAn/[^xk
conn.setAutoCommit(false); OZKZv,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); C,O9?t
for(int i=0;i<CountCache.list.size();i++){ ,\T `gh
CountBean cb=(CountBean)CountCache.list.getFirst(); >of9m
CountCache.list.removeFirst(); CTqhXk[
ps.setInt(1, cb.getCountId()); h1Y^+A_
ps.executeUpdate();⑴ pgUjje>#
//ps.addBatch();⑵ *>GRU8_}
} IUWJi\,
//int [] counts = ps.executeBatch();⑶ PE_JO(e;Xm
conn.commit(); 8XCT[X
}catch(Exception e){ OgK' ~j
e.printStackTrace(); D3O)Tj@:}(
} finally{ e6y!,My<
try{ iDCQqj`
if(ps!=null) { !(S.7#-r
ps.clearParameters(); oh:.iL}j
ps.close(); ?:5/4YC
ps=null; tHvP0RxM
} )*}?EI4.
}catch(SQLException e){} @]]\r.DG
DBUtils.closeConnection(conn); V2yX;u
} /+<G@+(
} 6 G,cc
public long getLast(){ p`"Ic2xPJ
return lastExecuteTime; on7?V<
} l>oJ^J
public void run(){ ErQGVE;zk
long now = System.currentTimeMillis(); !h^_2IX
if ((now - lastExecuteTime) > executeSep) { g/!tp;e
//System.out.print("lastExecuteTime:"+lastExecuteTime); )|]*"yf:E
//System.out.print(" now:"+now+"\n"); f]Zj"Tt-
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %xXb5aY
lastExecuteTime=now; *aYuuRx
executeUpdate(); 6ZXRb
} #/t+h#jG
else{ zq$0 ?vGd
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); bdBLfWe
} T0o0_R
} <pFbm
} i_y%HG
//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 n&Q0V.
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类写好了,下面是在JSP中如下调用。 q:wz!~(>
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<% {(d 6of`C_
CountBean cb=new CountBean(); #A~7rH%hi
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5sB~.z@
CountCache.add(cb); nx!+:P ,
out.print(CountCache.list.size()+"<br>"); T#}"?A|
CountControl c=new CountControl(); GG4FS
c.run(); NiVZ=wEp,
out.print(CountCache.list.size()+"<br>"); 5z.Y}
%>