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'a/ZR`B7
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CountBean.java =?Md&%j
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/* '0$[Ujc
* CountData.java }F`2$Q+CW
* jF_I4H
* Created on 2007年1月1日, 下午4:44 ",V5*1w
* iQ"F`C
* To change this template, choose Tools | Options and locate the template under ~WXxVm*@
* the Source Creation and Management node. Right-click the template and choose F/>Pvq]
* Open. You can then make changes to the template in the Source Editor. ^tcBxDC"]
*/ azc:C
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package com.tot.count; 7O^ S.(
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/** X
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* 0%NI-
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* @author (+ anTA=
*/ :Rj,'uH+h)
public class CountBean { n1(X%%2
private String countType; &)jZ|Q~
int countId; K)\gbQ|
/** Creates a new instance of CountData */ m9cT}x&j
public CountBean() {} r['C.S6
public void setCountType(String countTypes){ 9G/2^PI
this.countType=countTypes; DJ0T5VE W3
} \%Q
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public void setCountId(int countIds){ *v/*_6f*
this.countId=countIds; :]QxT8B
} E2kRt'~N
public String getCountType(){ G@!9)v]9
return countType; hP<qK Vy
} Q 9<_:3
public int getCountId(){ 7e[\0:Z
return countId; r!,V_a4n
} zL8A?G)=M
} @2*6+w_Ae
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CountCache.java s2=X>,kz?
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/* Rj`Y X0?+
* CountCache.java nW'x#0-
* _ u2
* Created on 2007年1月1日, 下午5:01 kk+8NwM1
* C~V$G}mM
* To change this template, choose Tools | Options and locate the template under a`Zf_;$@
* the Source Creation and Management node. Right-click the template and choose toJ&$HrE
* Open. You can then make changes to the template in the Source Editor. Pv.@Y30
*/ o|q#A3%?
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package com.tot.count; :K:gyVrC
import java.util.*; .Kwl8xRg
/** (C@@e'e
* 3y ,?>-
* @author 7'uc;5:
*/ !I_4GE,
public class CountCache { !#qB%E]a
public static LinkedList list=new LinkedList(); uZI a-b
/** Creates a new instance of CountCache */ CHI(\DXNs
public CountCache() {} ;g]+MLV9
public static void add(CountBean cb){ 4HE4e
if(cb!=null){
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list.add(cb); !;Nh7vG
} hiHp@"l<
} ZE`{J=,
} .y+U7"?s*
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CountControl.java -1JHhRr]
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/* \]%U?`A
* CountThread.java B4aZ3.&W
* 3/FB>w gt
* Created on 2007年1月1日, 下午4:57 3:
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* O_^h 7
* To change this template, choose Tools | Options and locate the template under #KW:OFT
* the Source Creation and Management node. Right-click the template and choose
?~IZ{!
* Open. You can then make changes to the template in the Source Editor. '7s!NF2
*/ UI;{3Bn
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package com.tot.count; Hp!F?J7sx
import tot.db.DBUtils; P7-3Vf_L
import java.sql.*; 6~>k]G
/** yk{al SF
* ]
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* @author .vMi<U;
*/ sXu+F2O
public class CountControl{ I&Y(]S,cU
private static long lastExecuteTime=0;//上次更新时间 aa/9o]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 uLF55:`<
/** Creates a new instance of CountThread */ Dzr5qP?#
public CountControl() {} e
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public synchronized void executeUpdate(){ T`sM4 VWqU
Connection conn=null; 9MxGyGz$
PreparedStatement ps=null; ,-)1)R\.
try{ /$(D>KU
conn = DBUtils.getConnection(); vNGvEJ`qn
conn.setAutoCommit(false); {IWb:p#I]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2l?J9c}Wo
for(int i=0;i<CountCache.list.size();i++){ qa6~N3*
CountBean cb=(CountBean)CountCache.list.getFirst(); f6nltZ
CountCache.list.removeFirst(); 6! 'Xo:p
ps.setInt(1, cb.getCountId()); fZ$2bI=
ps.executeUpdate();⑴ n}{cs
//ps.addBatch();⑵ _8
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} }q9f,mz
//int [] counts = ps.executeBatch();⑶ }R$%MU5::
conn.commit(); plfB}p
}catch(Exception e){ NO^(D+9
e.printStackTrace(); QUf_fe!,|
} finally{ Gj 3/&'k6
try{ 'Iu(lpF&
if(ps!=null) { v*3:8Y,
ps.clearParameters(); wn`budH?c8
ps.close(); O5
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ps=null; whCv9)x
} ^MUM04l
}catch(SQLException e){} ?9+;[X
DBUtils.closeConnection(conn); UlrY
} FhGbQJ?[3
} Q*:
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public long getLast(){ 14RL++
return lastExecuteTime; 5S LF1u;
} X!Q"p$D4(
public void run(){ 16vfIUtb
long now = System.currentTimeMillis(); GcuZPIN%D
if ((now - lastExecuteTime) > executeSep) { GCHssw~P'v
//System.out.print("lastExecuteTime:"+lastExecuteTime); .+yJ'*i$d
//System.out.print(" now:"+now+"\n"); <FEO6YP
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 71_N9ub@z
lastExecuteTime=now; EX_&wep@1
executeUpdate(); RswR DLl
} 'mF}+v^
else{ =#fqFL,
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
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} #'qW?8d}
} 1a<~Rmcil
} 2 O%UT?R
//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 dIm m},
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类写好了,下面是在JSP中如下调用。 w]_a0{Uh
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<% zw?6E8$h
CountBean cb=new CountBean(); C$8=HM3
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Sc&_6}K
CountCache.add(cb); S:gP\Atf>
out.print(CountCache.list.size()+"<br>"); # V+e
CountControl c=new CountControl(); !SnpesTn
c.run(); 8Ex0[e
out.print(CountCache.list.size()+"<br>"); bTj,5,8i
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