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: NZQl#ZJH:
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CountBean.java VpO+52&
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/* j3Yz=bsQ{c
* CountData.java ;1MRBk,
* |19zjhl
* Created on 2007年1月1日, 下午4:44 3UNmUDl[~
* c $fYK
* To change this template, choose Tools | Options and locate the template under }\?]uNH
* the Source Creation and Management node. Right-click the template and choose f\vy5''
* Open. You can then make changes to the template in the Source Editor. ?= RC?K
*/ 2mt
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package com.tot.count; +
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/** s[n*fV']A
* 1w$X;q"
* @author wfMtWXd;KB
*/ ]n
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public class CountBean { X4$86
private String countType; 1
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int countId; isR)^fI|
/** Creates a new instance of CountData */ v?L`aj1ox
public CountBean() {} +?%LX4Y
public void setCountType(String countTypes){ [h0.k"&[
this.countType=countTypes; YVW`|'7)|
} z#u<]] 5
public void setCountId(int countIds){ N ]|P||fC
this.countId=countIds; AM:lU
} l\DcXgD
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public String getCountType(){ Q~-M B]'
return countType; mM;5UPbZ
} sKniqWi
public int getCountId(){ {x\lK;
return countId; .Gcs/PN
} *1b1phh0/
} ]m=2 $mK
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CountCache.java YsA.,
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/* M@a=|N~
* CountCache.java 6!A+$"
* -oMp@2\e
* Created on 2007年1月1日, 下午5:01 Ch0t'
* gCP f1z
* To change this template, choose Tools | Options and locate the template under ZQN%!2
* the Source Creation and Management node. Right-click the template and choose N#&/d nV
* Open. You can then make changes to the template in the Source Editor. J5#shs[M:
*/ 7f_tH_(
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package com.tot.count; 2 e9lk$
import java.util.*; >mCS`D8
/** egn9O
* iZ;y(
* @author "bmWr)
*/ V6a+VfH
public class CountCache { 3cB=9Y{<
public static LinkedList list=new LinkedList(); f2,\B6+
/** Creates a new instance of CountCache */ "yG*Kh7ur
public CountCache() {} AD@-H0Y
public static void add(CountBean cb){ bPMkBm
if(cb!=null){ gbr-C
list.add(cb); .[:2M9Rx
} bKac?y~S_
} v[!ZRwk4w3
} #Nv)SCc
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CountControl.java }~+_|
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/* U%4s@{7
* CountThread.java ATkx_1]KM-
* k3VRa|Y")
* Created on 2007年1月1日, 下午4:57 z$b'y;k
* YJqbA?i
* To change this template, choose Tools | Options and locate the template under iT,Ya-9"
* the Source Creation and Management node. Right-click the template and choose =&x
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* Open. You can then make changes to the template in the Source Editor. met`f0jw
*/ 0~=>:^H'`q
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package com.tot.count; ,k+F8{Q.
import tot.db.DBUtils; QQW]j;'~
import java.sql.*; oeF0t'%
/** ~`!{5:v
* }:xj%?ki
* @author x2$Y"b?vz
*/ g"|/^G_6S
public class CountControl{ 4)z*Vux
private static long lastExecuteTime=0;//上次更新时间 %WO4uOi:@
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 #4wia%}u
/** Creates a new instance of CountThread */ ]]!&>tOlI
public CountControl() {} !J k|ha~r
public synchronized void executeUpdate(){ Wo,"$Z6B
Connection conn=null; y%@C-:
PreparedStatement ps=null; ;pVnBi
try{ p)YI8nW
conn = DBUtils.getConnection(); .u^4vVz
conn.setAutoCommit(false); Cw,;>>Y_b<
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");
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for(int i=0;i<CountCache.list.size();i++){ nv}z%.rRUj
CountBean cb=(CountBean)CountCache.list.getFirst(); *]+5T-R% $
CountCache.list.removeFirst(); rpMjDjW
ps.setInt(1, cb.getCountId()); x2.YEuSMC
ps.executeUpdate();⑴ yl UkVr
//ps.addBatch();⑵ }e8u p*#me
} l<dtc[
//int [] counts = ps.executeBatch();⑶ JzZ@Z8%a;
conn.commit(); =b/:rSd$NA
}catch(Exception e){ y25L`b
e.printStackTrace(); ^7-l<R[T
} finally{ @*"H{xo.U
try{ "Wn8}T*
if(ps!=null) { V)#rP?Y
ps.clearParameters(); L3|~
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ps.close(); C~q&
ps=null; 9Pjw<xt
} |N%#;7
}catch(SQLException e){} 1qN+AT
DBUtils.closeConnection(conn); `71(wf1q[f
} w+G+&ak<
} Fh
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public long getLast(){ WLA LXJ7
return lastExecuteTime; -0:Equ?pz
} a@s@E
public void run(){ ^7,`6g
long now = System.currentTimeMillis(); "|6763.{4
if ((now - lastExecuteTime) > executeSep) { {L.=)zt>
//System.out.print("lastExecuteTime:"+lastExecuteTime); !r %u@[(
//System.out.print(" now:"+now+"\n"); ~%Xs"R1c,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); D!5{CQl
lastExecuteTime=now;
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executeUpdate(); l2
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} 3.E3}Jz`
else{ 2Wp)CI<\D
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); g#s hd~e
} z=pGu_`2
} ! w2BD^V-
} MVXy)9q
//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 ^Y?Y5`!Q
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类写好了,下面是在JSP中如下调用。 /^Ng7Mi!
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<% rJUXIV>z
CountBean cb=new CountBean(); 8XhGo2zf
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); y_}jf,b4
CountCache.add(cb); <MzXTy3\
out.print(CountCache.list.size()+"<br>"); L{uQ:;w1
CountControl c=new CountControl(); / &#b*46
c.run(); C{2y*sx
out.print(CountCache.list.size()+"<br>"); {~{</ g/
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