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: /aa'ryl_%
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CountBean.java pgg4<j_mn
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/* !o.l:Mr
* CountData.java *M*:3v
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* ZU%7m_ zO
* Created on 2007年1月1日, 下午4:44 &PRu[!
* D]nVhOg|
* To change this template, choose Tools | Options and locate the template under PqMU&H_
* the Source Creation and Management node. Right-click the template and choose \wY? 6#;
* Open. You can then make changes to the template in the Source Editor. 2+pLDIIT
*/ Gq4~9Tm)*
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package com.tot.count; @}&o(q1M0
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/** 2J;h}/!H
* Q/T\Rr_d
* @author 9;3f`DK@2k
*/ [([?+Ouy
public class CountBean { :(A5,$
private String countType; S?.2V@Ic
int countId; ZRYs7 4<
/** Creates a new instance of CountData */ uVJ;1H!
public CountBean() {} $Bd{Y"P@6
public void setCountType(String countTypes){ ]kC/b^~+m
this.countType=countTypes; ^hOnLy2
} ^J0*]k%
public void setCountId(int countIds){ PfTjC"`,
this.countId=countIds; D0(QZrVa
} a%Ky;ys
public String getCountType(){ &f1dCL%z7
return countType; =
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} g0w<vD`<g
public int getCountId(){ $0rSb0[
return countId; A!}Wpw%(/
}
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} \N1G5W
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CountCache.java ]wLHe2bEu
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/* kb>:M.
* CountCache.java Yv!%Is
* 6AgevyVG
* Created on 2007年1月1日, 下午5:01 BwO^F^Pr?k
* hamn9
* To change this template, choose Tools | Options and locate the template under vluA46c
* the Source Creation and Management node. Right-click the template and choose ol^J-
* Open. You can then make changes to the template in the Source Editor. P@LYa_UFsN
*/ 56(S[
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package com.tot.count; 8/Z
import java.util.*; Nq>74q]}n8
/** <\]o#w*:
* xcO Si>
* @author 9I*zgM!F
*/ &mj98
public class CountCache { b;#Z/phix
public static LinkedList list=new LinkedList(); mjUln8Jc
/** Creates a new instance of CountCache */ `"J=\3->
public CountCache() {} qYj
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public static void add(CountBean cb){ -E1b5i;f
if(cb!=null){ O)|{B>2r
list.add(cb); &d]%b`EXq
} j`1%a]Bwc
} kmjSSh/t
} &i*/}OZz
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CountControl.java ,.Ac= "f
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/* )F;`07
* CountThread.java 8:c[_3w
* _+%RbJ~H
* Created on 2007年1月1日, 下午4:57 VYj hU?I
* *"#62U6
* To change this template, choose Tools | Options and locate the template under FCxLL"))
* the Source Creation and Management node. Right-click the template and choose nff&~lwhZ
* Open. You can then make changes to the template in the Source Editor. F)KUup)gc
*/ NDLk+n
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package com.tot.count; uNe5Mv|}
import tot.db.DBUtils; 3B:U>F,]4
import java.sql.*; Uu xbN-u
/** , Z*Fo: q
* 1euL+zeh
* @author RYzDF+/
*/ uev$5jlX
public class CountControl{ o9-b!I2
private static long lastExecuteTime=0;//上次更新时间 )`?Es8uW
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +$M%"=tk
/** Creates a new instance of CountThread */ qQC<oR
public CountControl() {} wzhM/Lmo\z
public synchronized void executeUpdate(){ :eqDEmr>
Connection conn=null; i_?";5B"
PreparedStatement ps=null; t3!?F(&
try{ :X-Z|Pv8
conn = DBUtils.getConnection(); Fl\X&6k
conn.setAutoCommit(false); Z3E957}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); FHWzwi*u}
for(int i=0;i<CountCache.list.size();i++){ T4n.C~
CountBean cb=(CountBean)CountCache.list.getFirst(); !$r4 lu
CountCache.list.removeFirst(); a=bP
ps.setInt(1, cb.getCountId()); ~`M>&E@Y_/
ps.executeUpdate();⑴ \},="
//ps.addBatch();⑵ WvVHSa4{
} .8[B
}S(
//int [] counts = ps.executeBatch();⑶ ')%Kv`hz
conn.commit(); %O-RhB4q
}catch(Exception e){ e<s56<3j
e.printStackTrace(); 1'tagv?
} finally{ -:IG{3fnu
try{ ],vUW#6$N
if(ps!=null) { 6B
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ps.clearParameters(); ^b=] =w
ps.close(); 9B&QY 2v
ps=null; 0MDdcjqw
} Q*|O9vu'D
}catch(SQLException e){} )%'Lm
DBUtils.closeConnection(conn); ~qe9U 0
} ncS.~F
} b(wzn`Z%Et
public long getLast(){ ]nE_(*w
return lastExecuteTime; m~Q]#r
} = Ly7H7Q2
public void run(){ $c4Q6w
long now = System.currentTimeMillis(); O<nJbsl_w
if ((now - lastExecuteTime) > executeSep) { N\XZ=t^h(
//System.out.print("lastExecuteTime:"+lastExecuteTime); F4+mkB:w*7
//System.out.print(" now:"+now+"\n"); ,|SO'dG
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); |}zv CD
lastExecuteTime=now; .`4N#EjP
executeUpdate(); m[S6pqz
} -'&4No
else{ u=B_c A}:
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); QF:" >G
} H'68K8i0
} 5HP6o
} ?d`?Ss;v
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 @@$=MSN
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类写好了,下面是在JSP中如下调用。 ]Cd1&
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<% yU"lW{H@
CountBean cb=new CountBean(); IxC/X5Mp^q
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (,$ H!qKy
CountCache.add(cb); DueQ1+ P
out.print(CountCache.list.size()+"<br>"); c`~aiC`l
CountControl c=new CountControl(); x]umh{H~
c.run(); NQefrof
out.print(CountCache.list.size()+"<br>"); 3vTX2e.w
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