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: v:rD3=M-
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CountBean.java XC|*A$x,
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/* z,pNb%*O
* CountData.java -#LjI.
* X=v~^8M7%
* Created on 2007年1月1日, 下午4:44 5>k>L*5J
* wgY6D!Y
* To change this template, choose Tools | Options and locate the template under }m6f^fs}
* the Source Creation and Management node. Right-click the template and choose ?gLR<d_
* Open. You can then make changes to the template in the Source Editor. [IiwN qZ[~
*/ ,YjxCp3
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package com.tot.count; /~40rXH2C
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/** t]s94 R q
* JOBz{;:R{
* @author r5o@+"!
*/ Iq{o-nq
public class CountBean { -=>sTMWpr
private String countType; Hx$.9'Oq\Q
int countId; 0 _Q*E3
/** Creates a new instance of CountData */ (O$}(Tn
public CountBean() {} D =$4/D:;
public void setCountType(String countTypes){ }@d>, 1DU
this.countType=countTypes; r0>q%eM8
} N83!C=X'
public void setCountId(int countIds){ l+%Fl=Q2em
this.countId=countIds; SOVjEo4'3
} >Q;
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public String getCountType(){ wHx}U M"
return countType; :^n*V6.4
} YWEYHr;%^?
public int getCountId(){ lM>.@:
return countId;
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} K[kds`
} H4t)+(:D'
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CountCache.java d$pYo)8o({
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/* 8qn 9|
* CountCache.java OY: u',T
* Us'Cs+5XcG
* Created on 2007年1月1日, 下午5:01 4S tjj!ew
* iHPUmTus--
* To change this template, choose Tools | Options and locate the template under Z a!
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* the Source Creation and Management node. Right-click the template and choose `19qq]
* Open. You can then make changes to the template in the Source Editor. 6
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*/ yE#g5V&
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package com.tot.count; !x>,N%~
import java.util.*; rWA6XDM7
/** I?B,sl_w
* 42&v% ;R
* @author ML=eL*}l
*/ J,??x0GDx,
public class CountCache { wTxbDT@ H5
public static LinkedList list=new LinkedList(); I_ONbJ9]
/** Creates a new instance of CountCache */ dPsLZ"I
public CountCache() {} x>v-m*4Z4@
public static void add(CountBean cb){ S_6g~PHsr
if(cb!=null){ )IHG6}<
list.add(cb); Nb0Ik/:<
} O$^xkv5.
} OZf6/10O/
} SAR=
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CountControl.java S<"oUdkz
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/* zVw:7-
* CountThread.java Or7
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* EkjgNEXq
* Created on 2007年1月1日, 下午4:57 V43TO
* SrF x_n
* To change this template, choose Tools | Options and locate the template under V^WU8x
* the Source Creation and Management node. Right-click the template and choose Q=WySIF.
* Open. You can then make changes to the template in the Source Editor. lCR!:~
*/ nob0T5G
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package com.tot.count; j
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import tot.db.DBUtils; 5MR,UgT
import java.sql.*; qw<HY$3=
/** V7EQ4Om:It
* TN\|fzj
* @author +y/ 55VLq
*/ h$`#YNd'
public class CountControl{ ,beS0U]
private static long lastExecuteTime=0;//上次更新时间 QOH<]~3J
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Ke!'gohv
/** Creates a new instance of CountThread */ ?^}_j
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public CountControl() {} k2r3dO@q
public synchronized void executeUpdate(){ 4jX3lq|
Connection conn=null; Rb EKP(uw
PreparedStatement ps=null; \9/RAY_G
try{ YHB9mZi
conn = DBUtils.getConnection(); 1'JD =
conn.setAutoCommit(false); 0OnV0SIL
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); E8ta|D
for(int i=0;i<CountCache.list.size();i++){ nn+_TMu
CountBean cb=(CountBean)CountCache.list.getFirst(); u#@RM^738d
CountCache.list.removeFirst(); {e"dm5
ps.setInt(1, cb.getCountId()); (5a1P;_Y
ps.executeUpdate();⑴ rQb7?O@-
//ps.addBatch();⑵ ; b*i3*!g
} Y%@hbUc}x9
//int [] counts = ps.executeBatch();⑶ \vRd}
conn.commit(); GSi>l,y'
}catch(Exception e){ "hQgLG
e.printStackTrace(); #$E)b:xj
} finally{ jo9gCP.
try{ ((bTwx
if(ps!=null) { O$D?A2eI
ps.clearParameters(); ;SY\U7B\
ps.close(); K\u_Ji]k
ps=null; y t5H oy
} -DjJ",h( $
}catch(SQLException e){} mV)+qXC
DBUtils.closeConnection(conn); JeCg|@
} ]Y`Ib0$
} ]JXKZV8$0
public long getLast(){ __Nv0Ru
return lastExecuteTime; 69OF_/23
} ac8P\2{"
public void run(){ x`%JI=q
long now = System.currentTimeMillis(); S\=1_LDx"
if ((now - lastExecuteTime) > executeSep) { fQdK]rLj
//System.out.print("lastExecuteTime:"+lastExecuteTime); t~hTp K*
//System.out.print(" now:"+now+"\n"); Gh\q^?}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); =r9r~SR#
lastExecuteTime=now; KC#/Z2A|<
executeUpdate(); !RH.|}
} /.1.MssQM
else{ !h`kX[:
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); KzV 2MO-$
} f0>!qt
} "@/62b
} hgj <>H|
//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 'xE
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类写好了,下面是在JSP中如下调用。 yN6>VD{F
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<% !.TLW
CountBean cb=new CountBean(); :O= \<t
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); wW>fVPr
CountCache.add(cb); 1:M@&1LYp
out.print(CountCache.list.size()+"<br>"); 2%u;$pj
CountControl c=new CountControl(); V[nQQxWp=
c.run(); T~4N+fK
out.print(CountCache.list.size()+"<br>"); Qk1xUE
%>