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: Iqx84
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CountBean.java ?;_O
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/* nSHNis
* CountData.java \WX@PfL
* T=>vh*J
* Created on 2007年1月1日, 下午4:44 6m@0;Ht
* Mb1wYh
* To change this template, choose Tools | Options and locate the template under WU7cF81$
* the Source Creation and Management node. Right-click the template and choose 5/,Qz>QE[
* Open. You can then make changes to the template in the Source Editor. _-RyHgX
*/ djfU:$!j&
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package com.tot.count; I3PQdAs~&h
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/** ?^. Pt
* 8 ip^]
* @author `H"vR:~{
*/ onib x^Fcd
public class CountBean { NN mM#eB:4
private String countType; ` .$&T7
int countId; 14-]esSa
/** Creates a new instance of CountData */ dWUUxKC
public CountBean() {} >8(jW
public void setCountType(String countTypes){ E>"8/
this.countType=countTypes; {"t5\U6cKM
} \FXp*FbQ
public void setCountId(int countIds){ 8O9Gs
this.countId=countIds; J)Ol"LXV
} >uHb ^
public String getCountType(){ (-J<Vy]
return countType; R+uw/LG
} ;?`@"YG)
public int getCountId(){ iu|v9+
return countId; C5MqwNX
} W "k|K:
} #
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CountCache.java xh r[A
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/* GMw)*
* CountCache.java >4c` UW
* &oEyixe
* Created on 2007年1月1日, 下午5:01 fbV@= (y?
* djGs~H>;U_
* To change this template, choose Tools | Options and locate the template under cWM:
* the Source Creation and Management node. Right-click the template and choose @k9Pz<ub
* Open. You can then make changes to the template in the Source Editor. 7f
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*/ 0MrN:M2B
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package com.tot.count; #D0 ~{H
import java.util.*; `O
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/** G1[(F`t>
* B!uxs
* @author EZ{\D!_Y
*/ +q-c8z
public class CountCache {
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public static LinkedList list=new LinkedList(); U!Mf]3
/** Creates a new instance of CountCache */ `S$sQ&
public CountCache() {} U6c@Et ,
public static void add(CountBean cb){ .
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if(cb!=null){ ,cD1{T\
list.add(cb); 5k~\or 5_
} m9!DOL1pl
} !5~k:1=
} x_W3sS]ej
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CountControl.java 4 4`WYK l
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/* &F`L}#oL&
* CountThread.java y!5:dvt
* LihdZ )
* Created on 2007年1月1日, 下午4:57 TzY*;
* KSsWjF}d
* To change this template, choose Tools | Options and locate the template under uY]T:UVk
* the Source Creation and Management node. Right-click the template and choose ]5)"gL%H`
* Open. You can then make changes to the template in the Source Editor. .<.#aY;N
*/ lRH0)5`
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package com.tot.count; [4\aYB 9N
import tot.db.DBUtils; |*fNH(8&H
import java.sql.*; ,Z5Fea
/** %"+4
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* yzg9I
* @author /GN4I!LA
*/ +ouY
public class CountControl{ ~#4~_d.=L
private static long lastExecuteTime=0;//上次更新时间 {G%3*=?,j
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 hIo0S8MOj$
/** Creates a new instance of CountThread */ }Aw47;5q;
public CountControl() {} 0Az/fzJlz
public synchronized void executeUpdate(){ 7H#2WFQ7
Connection conn=null; 8W$L:{ez
PreparedStatement ps=null; H `5Ct
try{ 8t=3
conn = DBUtils.getConnection(); l=NAq_?N\
conn.setAutoCommit(false); 70=(.[^+
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Bj=@&;
for(int i=0;i<CountCache.list.size();i++){ =]d^3bqN
CountBean cb=(CountBean)CountCache.list.getFirst(); `-u7 I
CountCache.list.removeFirst(); :*cHA
ps.setInt(1, cb.getCountId()); gi1j/j7
ps.executeUpdate();⑴ Oq}ip
//ps.addBatch();⑵ Ck@M<(x
} gb(#DbI
//int [] counts = ps.executeBatch();⑶ Bj8<@~bX:L
conn.commit(); +(y>qd
}catch(Exception e){ _Fxe|"<^
e.printStackTrace(); O:,=xIXR
} finally{ s-%J5_d f
try{ wonYm27f
if(ps!=null) { 0$QIfT)
ps.clearParameters(); 1OP"5f
ps.close(); MX?}?"y
ps=null; 5QOZ%9E&M
} ]!J<,f7W
}catch(SQLException e){} ki3 HcV
DBUtils.closeConnection(conn); -O %[!&`
} Z'e\_C
} cyBW0wV1
public long getLast(){ g<\>; }e
return lastExecuteTime; gwJ}]Tf
} d EIa=e|
public void run(){ #'8)u)!
long now = System.currentTimeMillis(); 6i-*N[!U
if ((now - lastExecuteTime) > executeSep) { u uSHCp
//System.out.print("lastExecuteTime:"+lastExecuteTime); F3 Y<ZbxT
//System.out.print(" now:"+now+"\n"); {6:&
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 3;A$<s
lastExecuteTime=now; nd;O(s;
executeUpdate(); 8m|x#*5fQl
} *W%'Di
else{ y
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); nNu[c[V
} Pj._/$R[/
} W8VO)3nmD
} i(P>Y2s
//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/l95fp
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类写好了,下面是在JSP中如下调用。 V_lGj
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<% 5!8-)J-H
CountBean cb=new CountBean(); [WYJrk.
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); z1FL8=
CountCache.add(cb); Bd8hJA
out.print(CountCache.list.size()+"<br>"); 61kO1,Uz*
CountControl c=new CountControl(); y}Cj#I+a
c.run(); 0f{IE@-b
out.print(CountCache.list.size()+"<br>"); )%BT*)x
%>