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: 2so!
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CountBean.java }%{LJ}\Px
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/* M:[ %[+6
* CountData.java U"^kH|
* >8#X;0\Kj
* Created on 2007年1月1日, 下午4:44 q%"VYt4
* ?FpWvyz|
* To change this template, choose Tools | Options and locate the template under biU^[g("
* the Source Creation and Management node. Right-click the template and choose ]rH\`0
* Open. You can then make changes to the template in the Source Editor. QLiu2U o
*/ Enn"hdI
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package com.tot.count; BMG3|N^
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/** 7`zHX&-W
* RbP6F*f
* @author pm
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*/ 2q=AEv/
public class CountBean { jD<{t
private String countType; d\|?-hY`[
int countId; K<SyC54
/** Creates a new instance of CountData */ --HZX
public CountBean() {} t!W(_8j
public void setCountType(String countTypes){ BW}U%B^.
this.countType=countTypes; t4zkt!`B
} Cz\ew B
public void setCountId(int countIds){ *
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this.countId=countIds; YQ9'0F[l
} M3c$=>
public String getCountType(){ mD$A4Y-'p
return countType; 59Xi3KY
} jjw`Dto&
public int getCountId(){ j,lT>/
return countId; Zw5Ni Xj
} ?(Dq ?-.
} c[wla<dO*
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CountCache.java cl[BF'.H
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/* `scR*]f1+
* CountCache.java dMf:h"7
* 7~^GA.92
* Created on 2007年1月1日, 下午5:01 }Z@ovsG
* |[<_GQl
* To change this template, choose Tools | Options and locate the template under GK)?YM
* the Source Creation and Management node. Right-click the template and choose +%T\`6
* Open. You can then make changes to the template in the Source Editor. 3G,Oba[$<
*/ 8uc1iB
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package com.tot.count; TJ_$vI
import java.util.*; WejYy|
/** C%$edEi
* Q]Y*K
* @author n7B7 m,@1
*/ J*yf2&lI5
public class CountCache { @Owb?(6?
public static LinkedList list=new LinkedList(); 'y;EhOwj,
/** Creates a new instance of CountCache */ BZ94NOOdw
public CountCache() {} 4IB9,?p
public static void add(CountBean cb){ @|
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if(cb!=null){ f2Klt6"9
list.add(cb); nrL9
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} iV5yJF{ZH
} "Gfh ,e
} l4 D+Y
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CountControl.java ^crCy-`#
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/* Tzt8h\Q^z
* CountThread.java 3 R=,1<
* UldXYtGe
* Created on 2007年1月1日, 下午4:57 5A)2} D]
* =e/9&993
* To change this template, choose Tools | Options and locate the template under wj*,U~syB
* the Source Creation and Management node. Right-click the template and choose A;;fACF8e
* Open. You can then make changes to the template in the Source Editor. nno}e/zqf
*/ e}D3d=6`
*? 5*m+
package com.tot.count; `>7;!
import tot.db.DBUtils; AsQ)q
import java.sql.*; +DW~BS3
/** #+:9T/*>0
* v6=RY<l"m
* @author G! ]k#.^A,
*/ 6bomh2
public class CountControl{ ]mo-rhDsM
private static long lastExecuteTime=0;//上次更新时间 j>*R]mr6
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 X}=n:Ql'YY
/** Creates a new instance of CountThread */ V@B__`y7
public CountControl() {} S'|,oUWDb
public synchronized void executeUpdate(){ KX76UW
Connection conn=null; ~k\fhx
PreparedStatement ps=null; RTvqCp
try{ 4E;VM{
conn = DBUtils.getConnection(); ~3Lg"I
conn.setAutoCommit(false); dU6ou'pf
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); -9%:ilX~
for(int i=0;i<CountCache.list.size();i++){ OglEt[ "
CountBean cb=(CountBean)CountCache.list.getFirst(); t|H^`Cv6
CountCache.list.removeFirst(); x^HGVWw_
ps.setInt(1, cb.getCountId()); O,J>/
ps.executeUpdate();⑴ r;/4F/6"
//ps.addBatch();⑵ gcE|#1>
} T?:Rdo!:u
//int [] counts = ps.executeBatch();⑶ 52SaKA[
conn.commit(); VYu~26Zr
}catch(Exception e){ j K!Au
e.printStackTrace(); #Vl 0.l3
} finally{ ~c8?>oN(
try{ r#+d&.|
if(ps!=null) { &%8'8,.
ps.clearParameters(); &)8:h+&Z
ps.close(); +vYoB$!
ps=null; CKtB-a
} 0)%YNaskj
}catch(SQLException e){} k>F'ypm
DBUtils.closeConnection(conn); U1@IX4^2`
} R?,an2
} ?Eg(Gu.J
public long getLast(){ @.osJ}FxA
return lastExecuteTime; H9KKed47d/
} N/]o4o
public void run(){ b_,|>U
long now = System.currentTimeMillis(); BHd&yIyI
if ((now - lastExecuteTime) > executeSep) { &J55P]7w
//System.out.print("lastExecuteTime:"+lastExecuteTime); *"R|4"uy
//System.out.print(" now:"+now+"\n"); Scp7X7{N
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6,"IDH|ND
lastExecuteTime=now; `Y
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executeUpdate(); ~u)}ScTp
} /+8JCp
else{ cmBB[pk\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); rW0kA1=E
} 6$fHtJD:
} [r3 !\HI7x
} xgABpikC^
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 @'YS1 N<
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类写好了,下面是在JSP中如下调用。 @WJgWJm
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<% cYFiJJLG]
CountBean cb=new CountBean(); _Bj)r}~7#
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); x6(~;J
CountCache.add(cb); GRGzP&}@
out.print(CountCache.list.size()+"<br>"); Ae
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CountControl c=new CountControl(); 9w"h
c.run();
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out.print(CountCache.list.size()+"<br>"); g$(
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%>