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: ]T;
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CountBean.java ho%G
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/* |.?Xov]
* CountData.java Y<;KKD5P'j
* )?<V-,D
* Created on 2007年1月1日, 下午4:44 FyWrb+_0v
* B&"c:)1
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* To change this template, choose Tools | Options and locate the template under .W51Cup@&
* the Source Creation and Management node. Right-click the template and choose ;$g?W"
* Open. You can then make changes to the template in the Source Editor. 7_~_$I~g*
*/ x-s\0l
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package com.tot.count; 4Cp)!Bq?/
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/** gv7@4G
* "]}?{2i;
* @author CE7{>pl
*/ .s%dP.P:i1
public class CountBean { _BI[F
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private String countType; (g3DI*Z
int countId; ke19(r Ch
/** Creates a new instance of CountData */ v<vaPvW
public CountBean() {} !,O Y{='
public void setCountType(String countTypes){ 2Ft#S8
this.countType=countTypes; zsr; 37
} >9,LN;Ic
public void setCountId(int countIds){ ,0aRHy_^
this.countId=countIds; /pL'G`
} w3FEX$`_
public String getCountType(){ R,`3 SW()
return countType; ltlnXjRUv
} OWZ;X}x
public int getCountId(){ e3WEsD+
return countId; >">grDX
} ss4YeZa
} E&;;2
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CountCache.java P=m
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/* H`nd |
* CountCache.java h|.{dv
* !X\aZ{}Q
* Created on 2007年1月1日, 下午5:01 dZ x
* ->'xjD
* To change this template, choose Tools | Options and locate the template under '[p0+5*x
* the Source Creation and Management node. Right-click the template and choose /Zg4JQ~
* Open. You can then make changes to the template in the Source Editor. x$) E^|A+
*/ +&[X7r<
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package com.tot.count; km29]V=}
import java.util.*; k1fX-2H
/** TTJj=KPA
* 3Qd%`k
* @author Yb?(Q%
*/ bd&Nf2
public class CountCache { NdB:2P
public static LinkedList list=new LinkedList(); ,S?M;n?z_
/** Creates a new instance of CountCache */ ]Y3s5#n
public CountCache() {} jZ0/@zOf
public static void add(CountBean cb){ x\!vr.
if(cb!=null){ ,|?rt`8)Q
list.add(cb); _VJG@>F9-
} *0z'!m12
} Mo]
} d5'4RYfkQ
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CountControl.java }tbZ[:T{K
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/* QG
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* CountThread.java g2 tM!IRQ
* .q'{3
* Created on 2007年1月1日, 下午4:57 WfYC`e7q
* )D"2Q:
* To change this template, choose Tools | Options and locate the template under v[~Q
* the Source Creation and Management node. Right-click the template and choose ?I7%ueFY
* Open. You can then make changes to the template in the Source Editor. B<jVo%og
*/ R) J/z
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package com.tot.count; ;O {"\H6
import tot.db.DBUtils; Nuaq{cl
import java.sql.*; V82hk0*j
/** V1\Rj0#G
* s'$3bLcb
* @author k<
*/ lI;ACF^
public class CountControl{ Tua#~.3}J
private static long lastExecuteTime=0;//上次更新时间 }Io5&ww:U
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 eV\VR
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/** Creates a new instance of CountThread */ mA4]c
public CountControl() {} Q1P=A:*]9
public synchronized void executeUpdate(){ l8+;)2p!
Connection conn=null; ft?c&h;At
PreparedStatement ps=null; V"8w:?
try{ .Ix[&+LsY
conn = DBUtils.getConnection(); iu QMVtv
conn.setAutoCommit(false); ORhvo,.u
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); d?A!0;(*
for(int i=0;i<CountCache.list.size();i++){ (f
CountBean cb=(CountBean)CountCache.list.getFirst(); j`%a2
CountCache.list.removeFirst(); |b+CXEzo
ps.setInt(1, cb.getCountId()); QW2SFpE
ps.executeUpdate();⑴ %VS+?4ww
//ps.addBatch();⑵ 2{4f>,][
} v8>bR|n5
//int [] counts = ps.executeBatch();⑶ AL*M`m_
conn.commit(); u_6x{",5I
}catch(Exception e){ Sw`+4
4
e.printStackTrace(); ;Mz7emt
} finally{ WT:ZT$W
try{ :~'R| l
if(ps!=null) { {tUxRX
ps.clearParameters(); =$#=w?~%
ps.close(); n W:Bo#
ps=null; )F4BVPI
} Y,{pG]B$w
}catch(SQLException e){} [p_<`gU?
DBUtils.closeConnection(conn); !_>o2
} MGH2z:
} =}2k+v-B
public long getLast(){ {11xjvAD
return lastExecuteTime; mj&$+z M>
} f}7/UGd
public void run(){ nc;iJ/\4
long now = System.currentTimeMillis(); TnJNs
if ((now - lastExecuteTime) > executeSep) { C;']FmK]
//System.out.print("lastExecuteTime:"+lastExecuteTime); VTK +aI
//System.out.print(" now:"+now+"\n"); FMz>p1s|dK
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 'EG/)0t`
lastExecuteTime=now; #1Iev7w
executeUpdate(); Gq{ );fq
} r\$`e7d}!
else{ 0D&-BAzi
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ~r&+18Z;
} 7-d.eNQl
} H.&"~eH
} apWv+A
//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 jQdIeQD+
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类写好了,下面是在JSP中如下调用。 &p5^Cjy L
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<% YA~`R~9d
CountBean cb=new CountBean(); 6Tsi^((Li
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); bd)Sb?
CountCache.add(cb); FA1h!Vit
out.print(CountCache.list.size()+"<br>"); 9ZI^R/*Kc
CountControl c=new CountControl(); 2j=HxE
c.run(); @Wa,
out.print(CountCache.list.size()+"<br>"); 8p PQ
%>