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: 1ti9FQ
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CountBean.java kKFhbHUZa
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/* h1(GzL%i_
* CountData.java WZ A8D0[
* !wU~;sL8C3
* Created on 2007年1月1日, 下午4:44 ~+~^c|
* )B!64'|M
* To change this template, choose Tools | Options and locate the template under F?!X<N{
* the Source Creation and Management node. Right-click the template and choose 1.U9EuI
* Open. You can then make changes to the template in the Source Editor. 1v?|n8
*/ RT~6 #Caf
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package com.tot.count; ta*6xpz-\Q
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/** A.v'ws+VDP
* Fv )H;1V
* @author o6v'`p'
*/ # cAX9LV
public class CountBean { evLZ<|
private String countType; 0dKv%X#\
int countId; wn&5Ul9Elb
/** Creates a new instance of CountData */ UNC%<=
public CountBean() {} $q%l)]+
public void setCountType(String countTypes){ hmG^l4B.T
this.countType=countTypes; ng-rvr
} uto
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public void setCountId(int countIds){ FQgc\-8tm
this.countId=countIds;
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} z~ f;5 xtI
public String getCountType(){ w vQ.9
return countType; Rnd.<jz+Y
} ?O| CY
public int getCountId(){ UWPzRk#s"
return countId; 1UwpLd
} =iFI@2
} 8wX|hK!Gz
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CountCache.java 7_^JgA|Kk7
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/* b-"kclK
* CountCache.java Ltrw)H}
* PX$_."WA
* Created on 2007年1月1日, 下午5:01 a^>e|Eq|
* +*')0I
* To change this template, choose Tools | Options and locate the template under .zQ'}H1.C
* the Source Creation and Management node. Right-click the template and choose 'k1vV
* Open. You can then make changes to the template in the Source Editor. px~ :'U
*/ 4r-CF#o
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package com.tot.count; TEEt]R-y
import java.util.*; ndE" v"_H
/** upc-Qvk
* b&_u+g
* @author 9N*!C{VW
*/ X[;-SXq
public class CountCache { d+iV19 #i
public static LinkedList list=new LinkedList(); &~MM\,KML
/** Creates a new instance of CountCache */ -SeHz.`N
public CountCache() {} j}F;Bfq!
public static void add(CountBean cb){ '0tNo.8K
if(cb!=null){ }P(<]UF
list.add(cb); enB2-)<K
} E8Y(C_:s
} |jw{7\+
} v9K=\ j
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CountControl.java J*zm*~8\
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/* 1!"iN~
* CountThread.java T {B\1|2w
* J!"#N }[
* Created on 2007年1月1日, 下午4:57 <%ZlJ_cM
* U_oei3QP
* To change this template, choose Tools | Options and locate the template under CeD(!1VG
* the Source Creation and Management node. Right-click the template and choose v;$cx*?
* Open. You can then make changes to the template in the Source Editor. ;>jLRx<KC
*/ F*{1, gb
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package com.tot.count; I;rh(FMV
import tot.db.DBUtils; N&YQZ^o
import java.sql.*; E!]d?t3b
/** ;]I~AGH:
* *m.4)2u=
* @author =t!$72g\
*/ +T*]!9%<`:
public class CountControl{ ^Sj*
private static long lastExecuteTime=0;//上次更新时间 $-l\&V++F
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &l;wb.%ijW
/** Creates a new instance of CountThread */ _2p D
public CountControl() {} K!A;C#b!
public synchronized void executeUpdate(){ (+w.?l
Connection conn=null; {Ip)%uR
PreparedStatement ps=null; g( -}M`
try{ s&Lyg>>`
conn = DBUtils.getConnection(); w7"&\8a
conn.setAutoCommit(false); 88~lP7J
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 3^2P7$W=
for(int i=0;i<CountCache.list.size();i++){ s{@3G8
CountBean cb=(CountBean)CountCache.list.getFirst(); ^^+vt8|
CountCache.list.removeFirst(); sA1 XtO<&7
ps.setInt(1, cb.getCountId()); 2 i:tPe&
ps.executeUpdate();⑴ geJO#;
//ps.addBatch();⑵ > a"4aYj
} VU ,tCTXz
//int [] counts = ps.executeBatch();⑶ <cNg_ZZ;8
conn.commit(); gVU&Yl~/^
}catch(Exception e){ :!WKD@]
e.printStackTrace(); -h1FrDBt
} finally{ ~9h/{$
try{ ZB5u\NpcW
if(ps!=null) { z>9gt
ps.clearParameters(); %LZ-i?DL4Q
ps.close(); 3lG=.yD
ps=null; ;{S7bH'6m
} m[E#$JZtG
}catch(SQLException e){} y_A7CG"^
DBUtils.closeConnection(conn); NI)q<@ju
} a,~}G'U
} n}!D)Gx
public long getLast(){ 03^?+[C
return lastExecuteTime; e}bY9
} r>.^4Z@
public void run(){ Y&y5^nG
long now = System.currentTimeMillis(); 6fcn(&Qk
if ((now - lastExecuteTime) > executeSep) { [&H?--I
//System.out.print("lastExecuteTime:"+lastExecuteTime); +E8}5pDt
//System.out.print(" now:"+now+"\n"); e_z"<yq
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^e4y:# Nu
lastExecuteTime=now; g4=6\vg
executeUpdate(); =[x
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} ;&?l1Vu
else{ ^iz2=}Q8
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); w/Ej>OS
} h&Q9
} O({vHqN>
} MsLQ'9%Au
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 wML5T+
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类写好了,下面是在JSP中如下调用。 I15g G.)
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<% }5{#f`Ca6
CountBean cb=new CountBean(); XJ9bY\>)q1
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 3GUJlFj
CountCache.add(cb); o^b4l'&o
out.print(CountCache.list.size()+"<br>"); .X(*mmH
CountControl c=new CountControl(); E])X$:P?
c.run(); =h/0k
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out.print(CountCache.list.size()+"<br>"); u>I;Cir4
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