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: ]O:N-Y
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CountBean.java 3<?XTv-
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/* iHp\o=#
* CountData.java 4"vaMa
* 2F8|I7R
* Created on 2007年1月1日, 下午4:44 9 F^;!
* A`u$A9[
* To change this template, choose Tools | Options and locate the template under '?Jxt:<
* the Source Creation and Management node. Right-click the template and choose e\b`n}nC
* Open. You can then make changes to the template in the Source Editor. PjIeZ&p
*/ =D^TK-H
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package com.tot.count; SjEdyN#
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/** G^(}a]>9
* EHlytG}@
* @author ]p~IYNl2%j
*/ 0~ &"
public class CountBean { T|"7sPgGR
private String countType; ?/JBt
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int countId; hGf-q?7
/** Creates a new instance of CountData */ GyC /_ntn
public CountBean() {} pX=,iOF[I
public void setCountType(String countTypes){ Y?#i{ixX6n
this.countType=countTypes; [ "xn5lE
} <fdPLw;@e4
public void setCountId(int countIds){ {$M;H+Foh
this.countId=countIds; k?VQi5M
} V5D`eX9
public String getCountType(){ LjdYsai-
return countType; kHJ96G
} M"_FrIO
public int getCountId(){ *wV[TKaN
return countId; )nu~9km3
} <TNk?df7
} ^\:2}4Uj_
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CountCache.java Z7jX9e"L
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/* [k]|Qink
* CountCache.java nVD Xj
* T!Sj<,r+j
* Created on 2007年1月1日, 下午5:01 vRPS4@9'
* }xFi&
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* To change this template, choose Tools | Options and locate the template under -iCcoA
* the Source Creation and Management node. Right-click the template and choose &D#+6M&LK{
* Open. You can then make changes to the template in the Source Editor. +[m8c){
*/ iQ^:
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package com.tot.count; K<v:-TjQZ:
import java.util.*; ,PWj_}|L[
/** *wi}>_\
* Q;nAPS
* @author mo1
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*/ N*DhjEU)[
public class CountCache { :[M[(
public static LinkedList list=new LinkedList(); %McO6.M@
/** Creates a new instance of CountCache */ 4(vyp.f
public CountCache() {} 0p fnV%
public static void add(CountBean cb){ &14W vAU
if(cb!=null){ 83.E0@$
list.add(cb); oJ78jGTnb
} :k46S<RE
} %d: A`7x
} A2x;fgi
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CountControl.java -cNx1et
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/* |
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* CountThread.java 30FykNh
* ~_ !ts{[E
* Created on 2007年1月1日, 下午4:57 Xz;b,C&*t
* MY-.t-3
* To change this template, choose Tools | Options and locate the template under a%hGZCI
* the Source Creation and Management node. Right-click the template and choose >Csbjf6
* Open. You can then make changes to the template in the Source Editor. ^Y^"'"
*/ YDiN^q7
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package com.tot.count; z^sST
import tot.db.DBUtils; ,m07p~,V
import java.sql.*; !v!N>f4S$
/** iUr xJh
* b"8FlZ$
* @author L)-*,$#<oW
*/ Q2C)tVK+
public class CountControl{ /~}_h O$S
private static long lastExecuteTime=0;//上次更新时间 LCQkgRs}~{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 zj]b&In6;
/** Creates a new instance of CountThread */ QJ];L7Hbo
public CountControl() {} # bX~=`
public synchronized void executeUpdate(){ _g6m=N4
Connection conn=null; Sb^
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PreparedStatement ps=null; gJ\%>r7h
try{ Ugi5OKdj7)
conn = DBUtils.getConnection(); Xyv8LB
conn.setAutoCommit(false); K="I<bK
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); '7nJb6V,0l
for(int i=0;i<CountCache.list.size();i++){ i+~QDo(Pi
CountBean cb=(CountBean)CountCache.list.getFirst(); Rlw9$/D!Z
CountCache.list.removeFirst(); PO
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ps.setInt(1, cb.getCountId()); v`{:~q*
ps.executeUpdate();⑴ ;]&-MFv#
//ps.addBatch();⑵ =|y|P80w
} r#xk`a
//int [] counts = ps.executeBatch();⑶ ?^3B3qqh9
conn.commit(); R!{7OkC
}catch(Exception e){ f]}}yBte`
e.printStackTrace(); oofFrAaT
} finally{ J>v$2?w`w
try{ v#=ayWgk
if(ps!=null) { 3 .)_uo0;o
ps.clearParameters(); WbzA Jx 5
ps.close(); 3c 28!3p
ps=null; b~!om
} 0]a1 5
}catch(SQLException e){} WzG07 2w
DBUtils.closeConnection(conn); *4#on>
} P`sN&Y~m
} gStY8Z!k
public long getLast(){ v_-ls"l
return lastExecuteTime; >5i ?JUZ
} 1PU*:58[
public void run(){ C
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long now = System.currentTimeMillis(); }Z6nN)[|0Y
if ((now - lastExecuteTime) > executeSep) { hZ#\t
//System.out.print("lastExecuteTime:"+lastExecuteTime); -]&<Sr-
//System.out.print(" now:"+now+"\n"); fjkT5LNxk
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); #J.u
lastExecuteTime=now; R+^z y"~
executeUpdate(); @+0V& jc
} yGV{^?yoP
else{ X'2Gi
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); P`!Ak@N
} 9`&77+|;e
} a-Fqp4
} --/-D5
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 &V;x 4
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类写好了,下面是在JSP中如下调用。 B_@7IbB
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<% nE<J`Wo$f
CountBean cb=new CountBean(); RQ5P}A
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); K|~AA"I;
CountCache.add(cb); jmPp-}tS7
out.print(CountCache.list.size()+"<br>"); S%V%!803!
CountControl c=new CountControl(); LO>8 j:
c.run(); 14u^[M"U
out.print(CountCache.list.size()+"<br>"); 3qcpf:
%>