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: ]maYUKqv}'
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CountBean.java &Gm$:T'~
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/* KucV3-I
* CountData.java B:"THN^
* =H0vE7 {*
* Created on 2007年1月1日, 下午4:44 <";,GaZQ
* 1%M&CX
* To change this template, choose Tools | Options and locate the template under wn
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* the Source Creation and Management node. Right-click the template and choose c4e_6=Iv
* Open. You can then make changes to the template in the Source Editor. c8)/:xxl
*/ gIR^)m
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package com.tot.count; $&|y<Y=
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/** L?_7bXoD
* -Z4{;I[Q@
* @author 53 QfTP
*/ }14{2=!Q
public class CountBean { o
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private String countType; 2)?(R;$,
int countId; h:XzUxL\
/** Creates a new instance of CountData */ =1h9rlFj"D
public CountBean() {} W$dn_9W
public void setCountType(String countTypes){ ^n#1<K[E
this.countType=countTypes; _2fkb=2@
} HhA -[p
public void setCountId(int countIds){ ;;5Uwd'-
this.countId=countIds; >idBS
} n<Svwa}
public String getCountType(){ ?!w^`D0}o
return countType; ufa41$B'yG
} ZA~Z1Mro#"
public int getCountId(){ AJt!!crs
return countId; nU+tM~C%a
} 4!$
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} ,!G{5FF8:
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CountCache.java `Yc_5&"
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/* 50jOA#l[
* CountCache.java ?wMHS4
* J?)RfK|!
* Created on 2007年1月1日, 下午5:01 F}Mhs17!|
* @#+jMV$g
* To change this template, choose Tools | Options and locate the template under *, Ld/O;s
* the Source Creation and Management node. Right-click the template and choose .=9s1~]
* Open. You can then make changes to the template in the Source Editor. 2.}R
*/ #)+- lPe
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package com.tot.count; si1*Wt<3Bc
import java.util.*; %kf>&b,Mi
/** 6XEZ4QP}
* 1,2EhfX|s
* @author 1Wg-x0R
*/ Ue5O9;y]u
public class CountCache { ir>]r<Zl
public static LinkedList list=new LinkedList(); VCNT4m
/** Creates a new instance of CountCache */ Tm+;0
public CountCache() {} v=YK8fNi
public static void add(CountBean cb){ E
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if(cb!=null){ tury<*
list.add(cb);
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} v|Jlf$>
} `Y?t@dd
} :@
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CountControl.java +\`vq"e
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/* *xRc *
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* CountThread.java +,'T=Ic{
*
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* Created on 2007年1月1日, 下午4:57 H{ M)-
* L6:h.1 U$
* To change this template, choose Tools | Options and locate the template under noVa=aU^
* the Source Creation and Management node. Right-click the template and choose )yee2(S
* Open. You can then make changes to the template in the Source Editor. Z%o7f6P0IX
*/ C.a5RF0
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package com.tot.count; hP?fMW$V
import tot.db.DBUtils; ^z1IN-Tm/
import java.sql.*; ,#u\l>&$
/** >}+Q:iNQ)2
* Q ~|R Z7G
* @author (ClhbfzD
*/ #5CI)4x0!
public class CountControl{ U)jUq_LX
private static long lastExecuteTime=0;//上次更新时间 R zR?&J
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ~GB=Nz
/** Creates a new instance of CountThread */ }Ag|gF!_
public CountControl() {} oVkq2
public synchronized void executeUpdate(){ R|,7d:k
Connection conn=null; =WZ%H_oxi
PreparedStatement ps=null; `_AM` >_
try{ :Z`4j
conn = DBUtils.getConnection(); W*T{,M@Y
conn.setAutoCommit(false); _."E%|5
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); zok D:c
for(int i=0;i<CountCache.list.size();i++){ Bt~s*{3$8
CountBean cb=(CountBean)CountCache.list.getFirst(); W^g'}}]T
CountCache.list.removeFirst(); cf8-]G?tK
ps.setInt(1, cb.getCountId()); QX0Y>&$)
ps.executeUpdate();⑴ ija:H'j
//ps.addBatch();⑵ ?T*";_o,B
} $3
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//int [] counts = ps.executeBatch();⑶ `7Ug/R<
conn.commit(); \P?ToTTV
}catch(Exception e){ ~t/JCxa
e.printStackTrace(); q(]f]Vl|0
} finally{ -WR}m6yMr
try{ a8uYs DS
if(ps!=null) { D[Iqn
ps.clearParameters(); pG yRX_;
ps.close(); |HbEk[?^s
ps=null; =I4.Gf"~f
} 2R@%Y/
}catch(SQLException e){} !Tfij(91
DBUtils.closeConnection(conn); ?ApRJm:T
} 2w1tK
} P#tvm,
public long getLast(){ R{3CW^1
return lastExecuteTime; vA?_-. J
} j7/(sf
public void run(){ f'{>AKi=C
long now = System.currentTimeMillis(); pCt}66k}
if ((now - lastExecuteTime) > executeSep) { gue(C(~.k_
//System.out.print("lastExecuteTime:"+lastExecuteTime); ki4f*Ej
//System.out.print(" now:"+now+"\n"); olty4kGD$V
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); LM1b I4
lastExecuteTime=now; hx!`F
executeUpdate(); c^S&F9/U*
} :C%47qv
else{ ,P@QxnQ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); z\}!RBOq
} Ak=UtDN[
} ?)cJZ>$!w
} 2V$9ei6
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 _i@x@:_l
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类写好了,下面是在JSP中如下调用。 )73DT3-0$
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<% |h,FUj<r
CountBean cb=new CountBean(); AQ}l%
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); "k>bUe|RG
CountCache.add(cb); SJ(9rhB5*.
out.print(CountCache.list.size()+"<br>"); {Gkn_h-^
CountControl c=new CountControl(); #NF+UJYJ&'
c.run(); z(UX't (q
out.print(CountCache.list.size()+"<br>"); r5)f82pQ
%>