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: |nH0~P#!
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CountBean.java <9k}CXv2PK
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/* +@],$=aE?
* CountData.java &9lc\Y4PY
* etK,zEd
* Created on 2007年1月1日, 下午4:44 /L|}Y242
* >3
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* To change this template, choose Tools | Options and locate the template under vYt:}$AE
* the Source Creation and Management node. Right-click the template and choose ~Ro:mH:w
* Open. You can then make changes to the template in the Source Editor. UH^wyKbM
*/ T4}?w
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package com.tot.count; uF3p1by
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/**
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* Z8dN0AqZ
* @author mV(x&`Cx
*/ :XQ
public class CountBean { YlcF-a
private String countType; yg[;
int countId; x>9EVa)
/** Creates a new instance of CountData */ F.
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public CountBean() {} +$=Wms-z
public void setCountType(String countTypes){ ylxfh(
this.countType=countTypes; '=b&)HbeK
} -0r"#48(%
public void setCountId(int countIds){ x5 ~E'~_
this.countId=countIds; .9fluAG
} bSmaE7
public String getCountType(){ }NBJ T4R
return countType; Okg8Ve2
} =]xk-MY"|R
public int getCountId(){ hic$13KuP
return countId; 5GFnfc}
} |AfQ_iT6c
} Q
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CountCache.java 'sQO0611S
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/* e(\S,@VN2
* CountCache.java qf=[*ZY
* ,0~
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* Created on 2007年1月1日, 下午5:01 8Bt-
* =XBXSW8)DJ
* To change this template, choose Tools | Options and locate the template under x-#9i
* the Source Creation and Management node. Right-click the template and choose ft qW3VW
* Open. You can then make changes to the template in the Source Editor. R:R@sU
*/ -*q2Y^A^l
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package com.tot.count; xAz4ZXj=q
import java.util.*; ~ kJpB t7M
/** wXZY5-h4
* RMt vEa
* @author _vLT!y
*/ Q0; gF?
public class CountCache { 4$2T zJE
public static LinkedList list=new LinkedList(); !cq|g
/** Creates a new instance of CountCache */ coVT+we
public CountCache() {} M)pi)$&c
public static void add(CountBean cb){ 2_\|>g|
if(cb!=null){ %` [`I>
list.add(cb); _w/N[E
} `LU,uz
} l<:E+lU
} JI,hy
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CountControl.java kpw4Mq@
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/* Kcdd=2 [T
* CountThread.java [=1?CD
* i@^`~vj
* Created on 2007年1月1日, 下午4:57 <0
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* oNsx Fi:
* To change this template, choose Tools | Options and locate the template under FH21m wV
* the Source Creation and Management node. Right-click the template and choose J<* Mk
* Open. You can then make changes to the template in the Source Editor. g):jZU]b
*/ (a!,)
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package com.tot.count; .mrRv8>$
import tot.db.DBUtils; }UdqX1jz
import java.sql.*; E
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/** )-"L4TC)
* *dTf(J
* @author J+gsmP-_
*/ :{uUc
public class CountControl{ RX\O'Zwl j
private static long lastExecuteTime=0;//上次更新时间 @N{Ht)1r
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 !jq6cND
/** Creates a new instance of CountThread */ 3i}B\
{
public CountControl() {} F_ Cz
public synchronized void executeUpdate(){ _-\{kJ
Connection conn=null; Q%1;{5
PreparedStatement ps=null; T2; 9
try{ WA5kX SdIb
conn = DBUtils.getConnection(); es FL<T
conn.setAutoCommit(false); [eP]8G\
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I_*>EA
for(int i=0;i<CountCache.list.size();i++){ {o<p{q
CountBean cb=(CountBean)CountCache.list.getFirst(); ',j-n$Z^=
CountCache.list.removeFirst(); BD#;3?|
ps.setInt(1, cb.getCountId()); d$~b`
ps.executeUpdate();⑴ /iuNdh
//ps.addBatch();⑵ GZX!iT
} :uDB3jN[
//int [] counts = ps.executeBatch();⑶ N,Bs% p#1
conn.commit(); s9bP6N!,
}catch(Exception e){ )II,HT-LY
e.printStackTrace(); cS7!,XC
} finally{ R_&z2I
try{ "a{f?
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if(ps!=null) { becQ5w/~
ps.clearParameters(); :P"Gym
ps.close(); PW4Wn`u
ps=null; 2U{RA's
} FRk_xxe"K
}catch(SQLException e){} *{s[$}uQ
DBUtils.closeConnection(conn); k ,(:[3J
} i~L7h=__
} += ~}PF
public long getLast(){ HbDB?s<
return lastExecuteTime; ,!4_Uc
} ?.ihWbW_
public void run(){ qW >J-,61/
long now = System.currentTimeMillis(); MA6%g} o
if ((now - lastExecuteTime) > executeSep) { obolDha
//System.out.print("lastExecuteTime:"+lastExecuteTime); E_rC"_Zte
//System.out.print(" now:"+now+"\n"); C8q-gP[
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 8!>pFVNJf
lastExecuteTime=now; 6D(m8
executeUpdate(); ,sl.:C 4
} D9C; JD
else{ CnYX\^Ow
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); rWqA)j*!
} k8V0-.UL}
} Wh_c<E}&
} r1atyK
//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 1dsxqN(:
'=* 5C{
类写好了,下面是在JSP中如下调用。 Ft!~w#&-
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<% 4]KceE
CountBean cb=new CountBean(); H4Ek,m|c
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); L1i> %5:g
CountCache.add(cb); O8o18m8UH
out.print(CountCache.list.size()+"<br>"); &W!@3O{~.
CountControl c=new CountControl(); 0O4mA&&!oK
c.run(); eqCB2u"Jq
out.print(CountCache.list.size()+"<br>"); T9?_ `h
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