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: r=Z#"68$
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CountBean.java @[#U_T- I
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/* +Mc kR
* CountData.java 1@q~(1-o
* 34-QgE
* Created on 2007年1月1日, 下午4:44 F]]np&UV.
* dya]^L}fL
* To change this template, choose Tools | Options and locate the template under 1|bu0d\]
* the Source Creation and Management node. Right-click the template and choose sfNXIEr^
* Open. You can then make changes to the template in the Source Editor. !`q*{Ojx
*/ Vo}3E]
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package com.tot.count; RBIf6oxdE
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/** MzT#1~
* NsJt=~
* @author Y^m2ealC
*/ o"~ODN"L
public class CountBean { Z m9 e|J
private String countType; Eb SH)aR
int countId; <8Ek-aNNt
/** Creates a new instance of CountData */ tRRPNY
public CountBean() {} @iK=1\-2
public void setCountType(String countTypes){ kF.!U/C
this.countType=countTypes; s|rlpd4y
} Kdh(vNB>
public void setCountId(int countIds){ h^^zR)EVb
this.countId=countIds; O=LS~&=,
} tt%Zwf
public String getCountType(){ ]UKKy2r.
return countType; : Q X~bq
} tW 53&q\=
public int getCountId(){ h=SQ]nV{
return countId; ";}Lf1M9
} ;l>
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} *F* c
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CountCache.java ~t[ #p:
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/* GY<ErS)2
* CountCache.java t+Kxww58
* ;Q&38qI
* Created on 2007年1月1日, 下午5:01 Pc>$[kT0
* 3Yf%M66t
* To change this template, choose Tools | Options and locate the template under @3KVYv,q
* the Source Creation and Management node. Right-click the template and choose 'EU{%\qM
* Open. You can then make changes to the template in the Source Editor. 7IW:,=Zk8+
*/ 'c5#M,G~
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package com.tot.count; kB1]_v/
import java.util.*; jUtrFl
/** 9|WBJ6
* 6g4CUP'Y
* @author 0i\ol9,bf
*/ *zeY<6
public class CountCache { &;L4Cj$q
public static LinkedList list=new LinkedList(); ##d\|r
/** Creates a new instance of CountCache */ XRXKO>4q
public CountCache() {} P`6
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public static void add(CountBean cb){ QwXM<qG*
if(cb!=null){ Oh6_Bci
list.add(cb); S+H#^WSt
} ,Hh7'`
} rg+28tlDn
} hj64ES#x
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CountControl.java A[J9v{bD
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/* :p@H
* CountThread.java W=M&U
* fHvQ 9*T
* Created on 2007年1月1日, 下午4:57 zk5sAHQ
* g!~&PT)*
* To change this template, choose Tools | Options and locate the template under idnn%iO
* the Source Creation and Management node. Right-click the template and choose SF+ ^dPwj
* Open. You can then make changes to the template in the Source Editor. pC(AM=RY!
*/ SdC505m0*
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package com.tot.count; dvxD{UH
import tot.db.DBUtils; ]W<E#^
import java.sql.*; L]B]~Tw
/** 6nt$o)[
* % \N.m/5
* @author M['25[
*/ ehCc
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public class CountControl{ hor ok:{
private static long lastExecuteTime=0;//上次更新时间 nkHr(tF
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 JfKhYRl
/** Creates a new instance of CountThread */ :i0xer
public CountControl() {} E#Ynn6
public synchronized void executeUpdate(){ I'"*#QOX
Connection conn=null; n4YEu\*
PreparedStatement ps=null; [UNfft=K3P
try{ I /3=~;u
conn = DBUtils.getConnection(); X^% I 3
conn.setAutoCommit(false); q9pBS1Ej
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); FePJ8
for(int i=0;i<CountCache.list.size();i++){ OTtSMO
CountBean cb=(CountBean)CountCache.list.getFirst(); NrVQK}%K
CountCache.list.removeFirst(); /r@P\_
ps.setInt(1, cb.getCountId()); mDipP
ps.executeUpdate();⑴ gv `jeN
//ps.addBatch();⑵ X X{:$f+
} pX6T7
//int [] counts = ps.executeBatch();⑶ T1PWFw\GH
conn.commit(); aO
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}catch(Exception e){ 9L%&4V}BIS
e.printStackTrace(); $f>WR_F
} finally{ Y8.0R-:ZAN
try{ [KWF7GQi
if(ps!=null) { w|Zq5|[
ps.clearParameters(); 8(KsU,%d
ps.close(); U,iTURd
ps=null; Y+upZ@Ga
} dyWWgC%A
}catch(SQLException e){} ,~K_rNNZ
DBUtils.closeConnection(conn); $0LlaN@e
} &>I8^i
} i+(`"8W
public long getLast(){ HLYM(Pz
return lastExecuteTime; m>:%[vm
} HxZ4t
public void run(){ 5`x9+XvoN
long now = System.currentTimeMillis(); DLS-WL
if ((now - lastExecuteTime) > executeSep) { ys+?+dY2
//System.out.print("lastExecuteTime:"+lastExecuteTime); 8>pFpS
//System.out.print(" now:"+now+"\n"); Z|8f7@k{|+
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
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lastExecuteTime=now; 7{<F6F^P
executeUpdate(); bs+KcY:N]
} apY m,_
else{ WK;p[u?~xi
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); C
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} k[v n:
} `
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} MIR17%G
//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 9s*Lzi[}
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类写好了,下面是在JSP中如下调用。 6_XX[.%
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<% L~mL9[( ,
CountBean cb=new CountBean(); xVl90ak
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 3ZZJYf=
CountCache.add(cb); v(: VUo]H
out.print(CountCache.list.size()+"<br>"); c,D'Hl6(%
CountControl c=new CountControl(); RhQOl9
c.run(); ;m`I}h<
out.print(CountCache.list.size()+"<br>"); *JpEBtTv=5
%>