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: M4
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CountBean.java >%N,F`^3
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/* ]XX>h~0
* CountData.java 6@:<62!;
* XKOPW/
* Created on 2007年1月1日, 下午4:44 %Yg|QBm|
* p9MJa[}V
* To change this template, choose Tools | Options and locate the template under $
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* the Source Creation and Management node. Right-click the template and choose 1bDXv,nD
* Open. You can then make changes to the template in the Source Editor. so Lmr's
*/ #g2&x sU
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package com.tot.count; ra@CouR^c{
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/** tu;Pm4q7
* k2#|^N
* @author d<m.5ECC}
*/ xbCQ^W2YU|
public class CountBean { l&Y'5k_R
private String countType; MlbcJo3
int countId; 9.9B#?
/** Creates a new instance of CountData */ \lwLVe
public CountBean() {} 5Z:qU{[
public void setCountType(String countTypes){ HHs!6`R$0c
this.countType=countTypes; NE Zu?g
} &2ty++gC
public void setCountId(int countIds){ ;R@D
this.countId=countIds; sfy}J1xIL
} {#pwr WG
public String getCountType(){ 2^r J|Ni
return countType; m|OB_[9
} r{*BJi.b
public int getCountId(){ pWH,nn?w.
return countId; I_R 6
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} ;Z`R!
} Pj!f^MN
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CountCache.java Cm"S=gV
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/* f'M([gn^_
* CountCache.java `UqX`MFz
* O{U j
* Created on 2007年1月1日, 下午5:01 bg)}-]u]
* {r5OtYmpR
* To change this template, choose Tools | Options and locate the template under U: )Gc
* the Source Creation and Management node. Right-click the template and choose T)ISDK4>S"
* Open. You can then make changes to the template in the Source Editor. uK ,W
*/ M23r/eg]
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package com.tot.count; ',rK\&lL6
import java.util.*; d..JW{
/** # nAq~@X
* 0y+i?y
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* @author =4V SbOlZ
*/ 6)20%*[
public class CountCache { Ji6.-[:
public static LinkedList list=new LinkedList(); q1ZZ T"'
/** Creates a new instance of CountCache */ OkCAvRg
public CountCache() {} 'P[#.9E
public static void add(CountBean cb){ pmO0/ty
if(cb!=null){ p(Osz7K
list.add(cb); YhC|hDC
} QBN\wL8g
} v53|)]V
} ~03MH'
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CountControl.java ?zbW z=nq
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/* BL"7_phM,
* CountThread.java
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* uv^x
* Created on 2007年1月1日, 下午4:57 HIC!:|
* |k,-]c;6
* To change this template, choose Tools | Options and locate the template under )+w1nw|m
* the Source Creation and Management node. Right-click the template and choose DVJn;X^T:
* Open. You can then make changes to the template in the Source Editor. {];-b0MS~
*/ n+i=Ff
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package com.tot.count; :F@goiuC
import tot.db.DBUtils; A
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import java.sql.*; =q`T|9v
/** Gzg3{fXl
* !ab ef.%:
* @author )}t't"
*/ L'
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public class CountControl{
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private static long lastExecuteTime=0;//上次更新时间 ;K%/sIIke
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Q;A\M
/** Creates a new instance of CountThread */ {t!7r_hj
public CountControl() {} %/5Wj_|p
public synchronized void executeUpdate(){ _mwt{D2r}
Connection conn=null; Vo6g /h?`
PreparedStatement ps=null; n\f]?B(
try{ \k{[HfVvn
conn = DBUtils.getConnection(); )feZ&G]
conn.setAutoCommit(false); n=AcN
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Kpa$1x
for(int i=0;i<CountCache.list.size();i++){ D!.1R!(Z
CountBean cb=(CountBean)CountCache.list.getFirst(); a ~W
CountCache.list.removeFirst(); U%[ye0@:
ps.setInt(1, cb.getCountId()); lBAu@M
ps.executeUpdate();⑴ m]vV.pwv
//ps.addBatch();⑵ e?*Teb?R
}
*
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//int [] counts = ps.executeBatch();⑶ #.$y
conn.commit(); sf# px|~9
}catch(Exception e){ RVLVY:h|F
e.printStackTrace(); 4RYH^9;>K
} finally{ N;6o=^ic
try{ g|7o1{
if(ps!=null) { CyW|k
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ps.clearParameters(); cDE5/!
ps.close(); !\9^|Ef?
ps=null; SW'eTG
} P".IW.^kk~
}catch(SQLException e){} +oq<}CNr{
DBUtils.closeConnection(conn); x;\/Xj;
} Z@f{f:Jc/"
} gq/Za/!6
public long getLast(){ b78~{ht`
return lastExecuteTime; (/,l0
} xIC@$GP
public void run(){ i1-%#YYF(
long now = System.currentTimeMillis(); /]MelW
if ((now - lastExecuteTime) > executeSep) { %Ta"H3ZW
//System.out.print("lastExecuteTime:"+lastExecuteTime); di0@E<@1:
//System.out.print(" now:"+now+"\n"); L$.3,./
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &
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lastExecuteTime=now; js@L%1r#L
executeUpdate(); 4KnBb_w
} zB~< @
else{ Y:t?W
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :zLf~W
} T<?kH
} FO:L+&hr?>
} ^\?Rh(pu
//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 nPqpat`E
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类写好了,下面是在JSP中如下调用。 *kg->J
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<% '?L^Fa_H
CountBean cb=new CountBean(); kLZVTVSJt
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]+W){W=ai
CountCache.add(cb); O=(F46 M
out.print(CountCache.list.size()+"<br>"); ,w H~.LHi
CountControl c=new CountControl(); F P|cA^$<
c.run(); 7bihP@I!
out.print(CountCache.list.size()+"<br>"); jy?*` q1]
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