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: ~VqFZasV
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CountBean.java Y_[g_
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/* y _'e yR@)
* CountData.java C~ZE95g
* X2\E9hJg
* Created on 2007年1月1日, 下午4:44 X)Dqeb6
* UsLh)#}h
* To change this template, choose Tools | Options and locate the template under "JzfL(yt
* the Source Creation and Management node. Right-click the template and choose S9G8aea/
* Open. You can then make changes to the template in the Source Editor. BgJkrv7~
*/ m x3}m?WQ
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package com.tot.count; oMh~5
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/** u?q&K|
* Zk]k1]u*5
* @author 6sYV7w,'@
*/ .-.q3ib
public class CountBean { j7@!J7S
private String countType; ljup#:n
int countId; u lH0%`Fi
/** Creates a new instance of CountData */ V.;:u#{@-Q
public CountBean() {} M4TrnZ1D}
public void setCountType(String countTypes){ *he7BUO
this.countType=countTypes; j6n2dMRvSE
} G%2P
public void setCountId(int countIds){ E x_L!9>!
this.countId=countIds; Y*Y&)k6t
} x8 f6,
public String getCountType(){ PSW#^o
return countType; [zY!'cz?
} <9@&oN+T
public int getCountId(){ i[^k.W3gf
return countId; rW:iBq
} 5{')GTdX>
} &bB6}H(
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CountCache.java G3H#XK D
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/* Dp!;7e s|
* CountCache.java c`-YIz)W
* BwJNi6,
* Created on 2007年1月1日, 下午5:01 j,}4TDWa
* EtGH\?d~]
* To change this template, choose Tools | Options and locate the template under > P(eW7RL
* the Source Creation and Management node. Right-click the template and choose 3nwz<P
* Open. You can then make changes to the template in the Source Editor. ?#4+r_dP
*/ F
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package com.tot.count; GL/ KB
import java.util.*; ?hKm&B;d
/** >5c]aNcv
* Fl<(m
* @author pNuqT*
*/ Y]~IY?I
public class CountCache { m+H% g"Zj
public static LinkedList list=new LinkedList(); /n(9&'H<
/** Creates a new instance of CountCache */ )eECOfmnZ
public CountCache() {} n-d:O\]
public static void add(CountBean cb){ i9KTX%s5^
if(cb!=null){ Ga.0Io&}C
list.add(cb); {h,_"g\V
} [1<(VyJ}ye
} INOH{`}Ew
} N9pwWg&<+
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CountControl.java N. jA 8X
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/* O"qR }W
* CountThread.java 97!H`|u <
* R+s1[Z
* Created on 2007年1月1日, 下午4:57 =m~ruZ/
* uw_H:-J
* To change this template, choose Tools | Options and locate the template under =w6}\ 'X
* the Source Creation and Management node. Right-click the template and choose L/)B}8m\
* Open. You can then make changes to the template in the Source Editor. )qmFK
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*/ goB;EWz
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package com.tot.count; {b2 aL7
import tot.db.DBUtils; p(.N(c
import java.sql.*; )'`CC>Q
/** U3/8A:$y
* 0F1u W>D1
* @author 0#<WOns1
*/ ;t|,nz4kJ
public class CountControl{ aF!WIvir
private static long lastExecuteTime=0;//上次更新时间 zLL)VFCJW
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 b) Ux3PB
/** Creates a new instance of CountThread */ ~ibF M5m
public CountControl() {} e^=NL>V6p
public synchronized void executeUpdate(){ g*F~8+]Y
Connection conn=null; n6/f an;
PreparedStatement ps=null; l/M[am
try{ g#}tm<
conn = DBUtils.getConnection(); 9Yn)t#G'`F
conn.setAutoCommit(false); y=#j`MH{>
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); o ~;M"
for(int i=0;i<CountCache.list.size();i++){ @*SA$9/l
CountBean cb=(CountBean)CountCache.list.getFirst(); 2Q}7fht
CountCache.list.removeFirst(); z#RuwB+
ps.setInt(1, cb.getCountId()); 2qlIy
ps.executeUpdate();⑴ {a.
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//ps.addBatch();⑵ {gw[%[ZM
} \TZ|S,FS
//int [] counts = ps.executeBatch();⑶ bH,M,xIL2
conn.commit(); -8/ JP
}catch(Exception e){ rfc|`*m}0
e.printStackTrace(); K>$qun?5
} finally{ lQWBCJ8y
try{ !O 8.#+
if(ps!=null) { IhfZLE.,
ps.clearParameters(); cN5"i0xk
ps.close(); QAi1,+y]7w
ps=null; u3ST;
} js
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}catch(SQLException e){} [<Q4U{F
DBUtils.closeConnection(conn); xvB8YW"
} n_}aZB3;U
} %XR<isn
public long getLast(){ ~TM>"eB b
return lastExecuteTime; Mb1wYh
} WU7cF81$
public void run(){ 5/,Qz>QE[
long now = System.currentTimeMillis(); _-RyHgX
if ((now - lastExecuteTime) > executeSep) { Ok,HD7
//System.out.print("lastExecuteTime:"+lastExecuteTime); 83Uw
//System.out.print(" now:"+now+"\n"); K'V 2FTJI
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); cl_TF[n?
lastExecuteTime=now; 7VY8CcL
executeUpdate(); x%pRDytA
} onib x^Fcd
else{ NN mM#eB:4
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); S}b~_}
} 6uqUiRs()
} 9$wAm89
} ##GY<\",;
//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 {m'AY)
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类写好了,下面是在JSP中如下调用。 vzG ABP
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<% 8gAu7\p}
CountBean cb=new CountBean(); )P%4:P
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); E<k^S{
CountCache.add(cb); fdLBhe#9M
out.print(CountCache.list.size()+"<br>"); ?M~
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CountControl c=new CountControl(); S eOy7
c.run(); D7gHE
out.print(CountCache.list.size()+"<br>"); w&5/Zh[~~L
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