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: 5Q88OxH
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CountBean.java Fzu{,b
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/* 5(W9J j]
* CountData.java 3k/MigT
* . FruI#99
* Created on 2007年1月1日, 下午4:44 o]Ki+ U
* V OX>Sl
* To change this template, choose Tools | Options and locate the template under PTP2QAt
* the Source Creation and Management node. Right-click the template and choose D%A-& =
* Open. You can then make changes to the template in the Source Editor.
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*/ e'6?iLpy
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package com.tot.count; 8a h]D
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/** OTm`i>rB
* r3kI'I|bq
* @author RoTT%c P_
*/ )t4C*+9<U
public class CountBean { phdN9<Z
private String countType; c1^3lgPv
int countId; p
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/** Creates a new instance of CountData */ +D@R'$N
public CountBean() {} ?,NAihN]
public void setCountType(String countTypes){ oW_WW$+N
this.countType=countTypes; {x:IsQZ
} x#^kv)
public void setCountId(int countIds){ OrBFe *2y
this.countId=countIds; c>g%oE
} W@tLT[}CG
public String getCountType(){ :-Pj )Y{I
return countType; 8M|Q^VeT,1
} ,aJrN!fzU
public int getCountId(){ vEsSqzc
return countId; 2R!W5gs1<
} }FXRp=s
} 3XRG"
*/)gk=x8
CountCache.java U`Zn*O~/
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/* lySa Jd
* CountCache.java NSq"\A\
* 6D0,ME#
* Created on 2007年1月1日, 下午5:01 mm 8O
* 7d)aDc*TjW
* To change this template, choose Tools | Options and locate the template under *l//r
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* the Source Creation and Management node. Right-click the template and choose Go|65Z\`7M
* Open. You can then make changes to the template in the Source Editor. m+g>s&1H
*/ epF>z
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package com.tot.count; Ba6xkEd
import java.util.*; UU/|s>F
/** 4pqZ!@45|
* AMdS+(J
* @author hs4r5[
*/ *C BCQp[$
public class CountCache { 7h2bL6Y88
public static LinkedList list=new LinkedList(); <c#[.{A}s
/** Creates a new instance of CountCache */ zCrcCr
public CountCache() {} YO,ldsSz|r
public static void add(CountBean cb){ W}RR_Gu
if(cb!=null){ 5 %Gf?LyO
list.add(cb); #"_MY-
} yKJ^hv"#
} YLGLr@:q
} Q)>'fZ)
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CountControl.java yH^*Fp8V
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/* fm0(
* CountThread.java Xhi?b|
* ks D1NB;9
* Created on 2007年1月1日, 下午4:57 gL`SZr9
* 0^[6
* To change this template, choose Tools | Options and locate the template under *$VurqLn
* the Source Creation and Management node. Right-click the template and choose 6ZBD$1$A!
* Open. You can then make changes to the template in the Source Editor. /`> P|J
*/ $}$@)!-
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package com.tot.count; ]Ho`*$dD
import tot.db.DBUtils; }3 }=tN5
import java.sql.*; ([~`{,sv
/** -cgukl4Va
* 1tdCzbEn+
* @author 27:x5g?
*/ CvJEY
public class CountControl{ $ *A3p
private static long lastExecuteTime=0;//上次更新时间 >gJWp@6V
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 qgNK!(kWpr
/** Creates a new instance of CountThread */ =6&D4~R
public CountControl() {} [2V/v
public synchronized void executeUpdate(){ I.!/R`
Connection conn=null; V-jL`(JF%
PreparedStatement ps=null; 7p6J
try{ JuSS5 _&
conn = DBUtils.getConnection(); RZA\-?cO)
conn.setAutoCommit(false); @k<~`S~|
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 3G^Ed)JvE
for(int i=0;i<CountCache.list.size();i++){ *.g?y6d
CountBean cb=(CountBean)CountCache.list.getFirst(); EB<q.
CountCache.list.removeFirst(); m{c#cR
ps.setInt(1, cb.getCountId()); -::%9D}P|
ps.executeUpdate();⑴ CN(4;-so)
//ps.addBatch();⑵ 46Nf|~
} UmX[=D|
//int [] counts = ps.executeBatch();⑶ Oy$BR
<\
conn.commit(); avu,o
}catch(Exception e){ ;!?K.,N:N
e.printStackTrace(); o"[bIXf-h
} finally{ $:!T/*p*
try{ b_yXM
if(ps!=null) { u,:`5*al{
ps.clearParameters(); Bw.&3efd
ps.close(); IviQ)hp
ps=null; 6a?p?I K^
} KTt$Pt/.
}catch(SQLException e){} 79H+~1Az
DBUtils.closeConnection(conn); (14kR
} B}+9U
} uFZB8+
public long getLast(){ x35s6
return lastExecuteTime; tL{~O=
} 0z7mre^Q
public void run(){ 7"p s#)O
long now = System.currentTimeMillis(); ]xEE7H]\h
if ((now - lastExecuteTime) > executeSep) { yuEOQ\!(u
//System.out.print("lastExecuteTime:"+lastExecuteTime); p]Zabky
//System.out.print(" now:"+now+"\n"); tY'QQN||
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 4&hqeY3
lastExecuteTime=now; /
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executeUpdate(); -oBas4J
} yMl'1W
else{ )O C[;>F7
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 'hw@l>1\9
} 5l0rw)
} O7'3}P;
} 2EwWV0BS
//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 gecT*^
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类写好了,下面是在JSP中如下调用。 NP'Ke:
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<% g4a X
CountBean cb=new CountBean(); ?0<INS~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); FNCLGAiZ
CountCache.add(cb); UQ])QTrZFi
out.print(CountCache.list.size()+"<br>"); zB"
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CountControl c=new CountControl(); EZQ+HECpK
c.run(); ~PW}sN6ppG
out.print(CountCache.list.size()+"<br>"); iCRw}[[
%>