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: JR@`2YP-
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CountBean.java E/|To
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/* -z)n?(pftm
* CountData.java Z8K?
* _x(o*v[Pt
* Created on 2007年1月1日, 下午4:44 Ch<[l8;K
* "&G/T ?4
* To change this template, choose Tools | Options and locate the template under pZqq]mHK
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. #P0&ewy
*/ Whm,F^
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package com.tot.count; uKUiV%p!
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/** $5aV:Z3P
* z[L8$7L
* @author N"Zt47(
*/ 0"
public class CountBean { $_"'&zQ'
private String countType; 7q?,
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int countId; 3Q.#c,`jV
/** Creates a new instance of CountData */ FWrX3i
public CountBean() {} SB H(y)
public void setCountType(String countTypes){ Czs8!S
this.countType=countTypes; 5YE'L.
} DgId_\Ze
public void setCountId(int countIds){ R3gdLa.
this.countId=countIds; Ezc?#<+7
} e>+i>/Fn{h
public String getCountType(){ 3no%E03p
return countType; x[~b2o
} Lt?lv2k=L
public int getCountId(){ gmw|H?]
return countId; cQCSe,$ W
} tkeoNuAM
} |"ls\ 7
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CountCache.java ayR-\mZ
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/* ,8U&?8l
* CountCache.java snE8 K}4
* bzBEX mC
* Created on 2007年1月1日, 下午5:01 x<tb
* s~ a"4~f
* To change this template, choose Tools | Options and locate the template under ^}/PGG\~r
* the Source Creation and Management node. Right-click the template and choose le|~BG hL
* Open. You can then make changes to the template in the Source Editor. 89pEfl j2
*/ UZ\u;/}
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package com.tot.count; _|kxY'_[8
import java.util.*; kCWV r
/** Y,<{vLEC
* :~"CuB/
* @author N7b8m?!
*/ ^ Edfv5
public class CountCache { X5zDpi|Dq
public static LinkedList list=new LinkedList(); +rd|A|hRq
/** Creates a new instance of CountCache */ Aza /6OL
public CountCache() {} sBj(Qd
public static void add(CountBean cb){ yj 3cyLXw
if(cb!=null){ 5d Eh7XL
list.add(cb); SYAyk
} [kVS
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} a!6{:8Zi0
} >)fi^
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CountControl.java 9UdM`v)(
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/* =upeRY@u5
* CountThread.java u^@f&BIG]:
* X9v.1s,
* Created on 2007年1月1日, 下午4:57 > kGGR
* -;s|
* To change this template, choose Tools | Options and locate the template under xI #9
* the Source Creation and Management node. Right-click the template and choose !#], hok8X
* Open. You can then make changes to the template in the Source Editor. oR)Jznmi}
*/ @Q)OGjaq
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package com.tot.count; kyR:[+je
import tot.db.DBUtils; uw>Ba %5
import java.sql.*; PS)4 I&;U
/** pnl{&<$C%C
* jwc)Lj}
* @author k^3>Y%^1
*/ [A+
>^ {
public class CountControl{ orzZ{87
private static long lastExecuteTime=0;//上次更新时间 l:
HTk4$0
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 p|X"@kuseO
/** Creates a new instance of CountThread */ \:%(q/v"X
public CountControl() {} T,,WoPU8t
public synchronized void executeUpdate(){ yr)G]K[/
Connection conn=null; DrKP%BnS
PreparedStatement ps=null; |HiE@
try{ dU&a{$ku[
conn = DBUtils.getConnection(); <Th6r.#?
conn.setAutoCommit(false); d~9A+m3b_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I&D5;8
for(int i=0;i<CountCache.list.size();i++){ F+YZE[h%
CountBean cb=(CountBean)CountCache.list.getFirst(); e(]!GA
CountCache.list.removeFirst(); \j@OZ
ps.setInt(1, cb.getCountId()); 1!xQ=DU"
ps.executeUpdate();⑴ ,Xu-@br{
//ps.addBatch();⑵ ne>pOK<vZ
} Nyku4r0
//int [] counts = ps.executeBatch();⑶ (yH'{6g\
conn.commit(); 9'fQHwsJ
}catch(Exception e){ Bd!bg|uO*
e.printStackTrace(); F|SXn\
} finally{ dPW#C5dm
try{ m ifxiV
if(ps!=null) { \r/rBa\
ps.clearParameters(); pj\u9
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ps.close(); du<tGsy
ps=null;
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} g;H=6JeG/
}catch(SQLException e){} Lu?C-$a C
DBUtils.closeConnection(conn); t|w_i-&b,
} Km qMFB62
} m(r,Acy6
public long getLast(){ =:xW>@bh|
return lastExecuteTime; hi_NOx
} [`ebM,W
public void run(){ l.q&D< _
long now = System.currentTimeMillis(); vLv@&lMW
if ((now - lastExecuteTime) > executeSep) { Yz<3JRw
//System.out.print("lastExecuteTime:"+lastExecuteTime); u0JB\)(-/h
//System.out.print(" now:"+now+"\n"); UFXaEl}R
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); QmQ=q7
lastExecuteTime=now; %6|nb:Oa
executeUpdate(); 5MroNr
} TJ10s%,V
else{ 8H%;WU9-
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); EEEh~6?-e
} =2`[&
} Kr?TxhUHd
} 5#HW2"7
//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 iowTLq!?
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类写好了,下面是在JSP中如下调用。 C'>|J9~Gz
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<% z 9vInf@M
CountBean cb=new CountBean(); 3U<cWl@
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); e),q0%5
CountCache.add(cb); \Z?9{J
out.print(CountCache.list.size()+"<br>"); prWk2_D;*
CountControl c=new CountControl(); "Bh}}!13
c.run(); T-'OwCB1q
out.print(CountCache.list.size()+"<br>"); )MtF23k)g
%>