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: Ml$<x"Q
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CountBean.java mogmr
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/* m";..V
* CountData.java :_y!p
* 5[g\.yi2_]
* Created on 2007年1月1日, 下午4:44 6_<~]W&
* d&CpaOSu
* To change this template, choose Tools | Options and locate the template under &&m3E=K!^
* the Source Creation and Management node. Right-click the template and choose {g#4E0.A!
* Open. You can then make changes to the template in the Source Editor. H0#=oJr$)W
*/ ]iGeqwT
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package com.tot.count; R|}N"J _
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/** gs;^SRE I
* 0Dna+V/jI
* @author g9q}D-
*/ y] c1x=x
public class CountBean { hVmnXT
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private String countType; &oMWs]0
int countId; En1LGi4#
/** Creates a new instance of CountData */ u -P !2vT
public CountBean() {} RYA@{.O
public void setCountType(String countTypes){ %0} ^M1
this.countType=countTypes; ]VxC]a2
} Y*$>d/E
public void setCountId(int countIds){ z4:<?K
this.countId=countIds; R2n
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} g\fj6
public String getCountType(){ PBnH#zm
return countType; /ZD 6pF
} =$Mf:F@
public int getCountId(){
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return countId; QOo'Iv+EL
} *Q^z4UY
} ) jH`lY) 1
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CountCache.java k`Ifl)
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/* }a$.ngP
* CountCache.java
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* g&c ~grD
* Created on 2007年1月1日, 下午5:01 8k95IJR1
* 5gtf`ebs/
* To change this template, choose Tools | Options and locate the template under +x=)Kp>
* the Source Creation and Management node. Right-click the template and choose <|4$TH^t
* Open. You can then make changes to the template in the Source Editor. >P:X\5Oj
*/ hK{H7Ey*
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package com.tot.count; vo`&
import java.util.*; O`c50yY
/** Hl0"
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* kFwFPK%B
* @author
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*/ ^APtV6g
public class CountCache { xy[#LX)RW
public static LinkedList list=new LinkedList(); 29,ET}~
/** Creates a new instance of CountCache */ nq]6S$3
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public CountCache() {} <-!1`@l>
public static void add(CountBean cb){ /O}<e TR
if(cb!=null){ s{Y4wvQyB
list.add(cb); UMR ?q0J
} vUJ;D
} 0mujf
} WA8<:#{e
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CountControl.java ]~I+d/k
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/* )rK2%\Z
* CountThread.java (tX3?[ii
* +ODua@ULFB
* Created on 2007年1月1日, 下午4:57 OALNZKP
* yl~_~<s6
* To change this template, choose Tools | Options and locate the template under ^~;ia7V&2
* the Source Creation and Management node. Right-click the template and choose +Cw_qS"=
* Open. You can then make changes to the template in the Source Editor. W~'xJ
*/ )"pvF8JR%3
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package com.tot.count; n(J>'Z
import tot.db.DBUtils; RyJy%|\-S
import java.sql.*; xKG7d8=
/** 3$nK
* ^obuMQ;
* @author 9p qsr~
*/ V_gl#e#
public class CountControl{ b<00 %Z
private static long lastExecuteTime=0;//上次更新时间 Bzrnmz5S
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 :J`@@H
/** Creates a new instance of CountThread */ Wr%ov6:
public CountControl() {} E7fQ9]
public synchronized void executeUpdate(){ I_<XL<
Connection conn=null; x 3=1/#9
PreparedStatement ps=null; MqnUym
try{ 0I)$!1~O)
conn = DBUtils.getConnection(); /RxP:>hVv
conn.setAutoCommit(false); G kjfDY:
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 172 G
for(int i=0;i<CountCache.list.size();i++){ 8|i'~BFHs
CountBean cb=(CountBean)CountCache.list.getFirst(); [j+:2@
CountCache.list.removeFirst(); 1IA1;
ps.setInt(1, cb.getCountId()); ?eIb7O
ps.executeUpdate();⑴ y("WnVI
//ps.addBatch();⑵ ;>v.(0FE6
} 4GRD- f[
//int [] counts = ps.executeBatch();⑶ Q v9q~l
conn.commit(); =0=#M(w
}catch(Exception e){ q@ -B+
e.printStackTrace(); iYStl
} finally{ `F7]M
try{ G;l7,1;MU:
if(ps!=null) { v_!6S|
ps.clearParameters(); z%YNZ^d
ps.close(); B$_4ul\)
ps=null; ,x8;| o5
} I9S;t_Z<
}catch(SQLException e){} OOqT 0wN
DBUtils.closeConnection(conn); J:m/s9r
} JXK\mah
} a{]=BY oL
public long getLast(){ \X8b!41
return lastExecuteTime; EL?(D
} " CT}34l
public void run(){ fHup&|.
long now = System.currentTimeMillis(); N'v3
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if ((now - lastExecuteTime) > executeSep) { )hZ7`"f,ZN
//System.out.print("lastExecuteTime:"+lastExecuteTime); y|5s
//System.out.print(" now:"+now+"\n"); r)iEtT!p*
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ~T1W-ig4[*
lastExecuteTime=now; +.V+@!
executeUpdate(); -F ~DOG%
} d.wGO]"
else{ %":3xj'EEI
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); IL].!9
} Z+El(f x
} h<G4tjtk
} {]HiT pn
//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 _Op%H)
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类写好了,下面是在JSP中如下调用。 NKO"'
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<% 0^ODJ7
CountBean cb=new CountBean(); j<t3bM-G
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); : ,l7e
CountCache.add(cb); a: "1LnvR
out.print(CountCache.list.size()+"<br>"); -+*h'zZ[<w
CountControl c=new CountControl(); F^yW3|Sb
c.run(); l_^OdQ9D
out.print(CountCache.list.size()+"<br>"); 2LwJ%!
%>