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: ESS1 L$y
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CountBean.java &,/-<y-S
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/* gI Gi7x
* CountData.java ,MLAW
* 6TQ[2%X'
* Created on 2007年1月1日, 下午4:44 vsq
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* [NGq$5
* To change this template, choose Tools | Options and locate the template under 4*q6#=G
* the Source Creation and Management node. Right-click the template and choose VjiwW%UOM
* Open. You can then make changes to the template in the Source Editor. \)g}
*/ RM25]hx
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package com.tot.count; ;Q5o38(
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/** _(@Vf=t
* H5gcP11r
* @author xWWVU}fd1
*/ T+5H2]yy)
public class CountBean { ,;h}<("q
private String countType; X4bZ4U*
int countId; ?*QL;[n1
/** Creates a new instance of CountData */ j2hp*C'^
public CountBean() {} 1l}fX}5%I;
public void setCountType(String countTypes){ ~!Rf5QA85
this.countType=countTypes; 3XUie;*`
} 8feLhWg'P
public void setCountId(int countIds){ @[ '?AsO
this.countId=countIds; m\ @Q}
} r,GgMk
public String getCountType(){ a7z%)i;Z
return countType; |[/XG2S
} jyRz53
public int getCountId(){ ~.S/<:`U
return countId; A{Y/eG8
} -ozcK
} 6ZC~q=my
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CountCache.java }A<fCm7
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/* '^:q|h
* CountCache.java '81WogH:
* ;'4Kg@/
* Created on 2007年1月1日, 下午5:01 ZP4y35&%y
* 1(a+|
* To change this template, choose Tools | Options and locate the template under @l~MY*hp
* the Source Creation and Management node. Right-click the template and choose A^7}:[s20
* Open. You can then make changes to the template in the Source Editor. :rN5HOg^9
*/ !$,e)89
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package com.tot.count; [ldx_+xa:E
import java.util.*; Ehtb`Ms
/** Gwfi
* 'R n\CMTH
* @author DV~g
*/ idZ]d6
public class CountCache { 3TT?GgQ
public static LinkedList list=new LinkedList(); fjy2\J!
/** Creates a new instance of CountCache */ \'P79=AU
public CountCache() {}
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public static void add(CountBean cb){ l`E KL2n
if(cb!=null){ {MmK:C
list.add(cb); cq1)b\ |
} JjBlje
} =K6{AmG$
} ,@@FAL
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CountControl.java SrvC34<7
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/* n'<F'1SWv
* CountThread.java b5UIX Kim
* [F^j(qTR
* Created on 2007年1月1日, 下午4:57 lUM-~
* I oC}0C7
* To change this template, choose Tools | Options and locate the template under /h K/t;
* the Source Creation and Management node. Right-click the template and choose iaQ3mk#
* Open. You can then make changes to the template in the Source Editor. m/1;os5+8
*/ R-BN}ZS
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package com.tot.count; T=T1?@2C
import tot.db.DBUtils; 20BU;D3
import java.sql.*; ap .L=vn
/** ]=sGLd^)E
* `g,i`<
* @author GuRJ
*/ KA]5tVQA
public class CountControl{ :stA]JB#
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private static long lastExecuteTime=0;//上次更新时间 Vg1MA
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 d)v'K5
/** Creates a new instance of CountThread */
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public CountControl() {} \yA*)X+
public synchronized void executeUpdate(){ SQI =D8
Connection conn=null;
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PreparedStatement ps=null; oJor
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try{ - f%J_`
conn = DBUtils.getConnection(); .Gnzu"lod
conn.setAutoCommit(false); Ve|=<7%%S
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ~&Y%yN^
for(int i=0;i<CountCache.list.size();i++){ JcI~8;Z@Z~
CountBean cb=(CountBean)CountCache.list.getFirst(); 43o!Vr/S
CountCache.list.removeFirst(); 6vebGf
ps.setInt(1, cb.getCountId()); xw~&OF&
ps.executeUpdate();⑴ Z oQPvs7_
//ps.addBatch();⑵ G:!'hadw
} |Ht~o(]&&/
//int [] counts = ps.executeBatch();⑶ fTV}IP
conn.commit(); !wEz=
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}catch(Exception e){ q
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e.printStackTrace(); IM&l%6[).
} finally{ 8H2A<&3i
try{ a3E.rr;b
if(ps!=null) { }Uunlz<
ps.clearParameters(); LE4P$%>H
ps.close(); tLe"i>
ps=null; ]MV=@T^8#
} A$XmO}+
}catch(SQLException e){} 0z=^_Fb
DBUtils.closeConnection(conn); '645Fr[lg
} LP5@ID2G
} 3^p;'7x
public long getLast(){ ]ZM-c~nL
return lastExecuteTime; ./E<v
} u75(\<{
public void run(){ >iFi~)i_4y
long now = System.currentTimeMillis(); `ouCQ]tKz
if ((now - lastExecuteTime) > executeSep) { >`D$Jz,
//System.out.print("lastExecuteTime:"+lastExecuteTime); Lsz)\yIPj
//System.out.print(" now:"+now+"\n"); J+0T8
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Ox}a\B8
lastExecuteTime=now; J={IGA
executeUpdate(); 3q:>NB<
} Bq#B+JwX
else{ K._*
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); gqQ"'SRw
} lc\f6J>HT
} nM6/c
} ;\)N7SJ
//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 ) E(9
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类写好了,下面是在JSP中如下调用。 #tQ__V
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<% R}Z2rbt
CountBean cb=new CountBean(); |;(0]
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Q[.HoqWK
CountCache.add(cb); ?cD2EX%(
out.print(CountCache.list.size()+"<br>"); r@]iy78
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CountControl c=new CountControl(); .3< sv
c.run(); 3eJ"7sftW
out.print(CountCache.list.size()+"<br>"); kESnlmy@J
%>