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: 9w;?-
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CountBean.java Sn3:x5H,l
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/* E\)eu1Hw4B
* CountData.java Mxz,wfaH>
* UWG+#,1J.\
* Created on 2007年1月1日, 下午4:44 Kf7WcJ4b
* =N.!k Vkl
* To change this template, choose Tools | Options and locate the template under sDiHXDI_m
* the Source Creation and Management node. Right-click the template and choose FT\?:wpKa
* Open. You can then make changes to the template in the Source Editor. h:qHR]
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*/ X=p"5hhfn
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package com.tot.count; 9\O(n>
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/** 8KjRCm,I
* )3?rXsSR
* @author utO.WfWP
*/ X} JOX9pK
public class CountBean { KI&:9j+M)
private String countType; *FgJ|y6gk
int countId; Wr|G:(kw\!
/** Creates a new instance of CountData */ OHp5z?
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public CountBean() {} KS>$`ax,
public void setCountType(String countTypes){ 2z2`
this.countType=countTypes; |w)5;uQ&\
} J=WB6zi
public void setCountId(int countIds){ setLdEi
this.countId=countIds; o$_93<zc
} cqL(^R.
public String getCountType(){ z?.(3oLT
return countType; ^)\+l%M
} `ti8-
public int getCountId(){ CJw$j`k
return countId; L`K;IV%;
} a5wDm
} M'jXve(=yF
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CountCache.java T |"`8mG
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/* 9Vh_[^bR
* CountCache.java .)PqN s:
* Z[IM<S9lz
* Created on 2007年1月1日, 下午5:01 e6P[c=m
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* Rl@$xP
* To change this template, choose Tools | Options and locate the template under snMQ"ju
* the Source Creation and Management node. Right-click the template and choose +l\<?
* Open. You can then make changes to the template in the Source Editor. T1~)^qQ
*/ 70iH0j)
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package com.tot.count; TgaYt\"i[
import java.util.*; <f%/px%1
/** T_ ^C#>
* .hz2&9Ow
* @author !Cb=B
*/ }: #dV
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public class CountCache { Di.;<v#FL
public static LinkedList list=new LinkedList(); o~~ 9!\
/** Creates a new instance of CountCache */ \graMu}-
public CountCache() {} P/aDd@j
public static void add(CountBean cb){ t .=Oj
if(cb!=null){ 5+L8\V9;
list.add(cb); b(T@~P/
} X4I]9t\
} ZgF/;8!~V-
} 76MsrOv55
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CountControl.java LZV}U*
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/* &va*IR
* CountThread.java (+MC<J/i
* f)Y
* Created on 2007年1月1日, 下午4:57 A'g,:8Ou
* #]zhZW4
* To change this template, choose Tools | Options and locate the template under W8*
2;F]
* the Source Creation and Management node. Right-click the template and choose P6HGs?
*
* Open. You can then make changes to the template in the Source Editor. 0zV 4`y
*/ |cu`f{E2]
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package com.tot.count; 3j&B(aLy
import tot.db.DBUtils; 'G
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import java.sql.*; U"x~Jb3]O
/** -3k;u
* )>$^wT
* @author ,>S+-L8
*/ b;{h?xc6
public class CountControl{ oc;VIK)g]c
private static long lastExecuteTime=0;//上次更新时间 H ja^edLj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 uGCtLA+sL
/** Creates a new instance of CountThread */ ]L(54q;W
public CountControl() {} X%`KYo%
public synchronized void executeUpdate(){ 2FT-}w0;
Connection conn=null; u\5g3BH
PreparedStatement ps=null; b7v dk
try{ B(Y.`L? %E
conn = DBUtils.getConnection(); 0BXs&i-TP5
conn.setAutoCommit(false); ?pKN'`
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Oxj(g;}
for(int i=0;i<CountCache.list.size();i++){ *H*\gaSh
CountBean cb=(CountBean)CountCache.list.getFirst(); F(0Z ]#+
CountCache.list.removeFirst(); u_Zm1*'?B
ps.setInt(1, cb.getCountId()); xppkLoPK
ps.executeUpdate();⑴ A^vvST%7
//ps.addBatch();⑵ u*k*yWdr
} LaT8l?q q
//int [] counts = ps.executeBatch();⑶ v>:=w|.HC
conn.commit(); [a+4gy
}catch(Exception e){ L5C2ng>
e.printStackTrace(); w .l|G,%=
} finally{ }{=8&gA0
try{ /&QQ p3
if(ps!=null) { x_|>n<Z
ps.clearParameters(); oek #^:pF
ps.close(); x/_dW
ps=null; EqQ3=XMUL@
} -$m@*L
}catch(SQLException e){} Zly-\z_
DBUtils.closeConnection(conn); 3FY_A(+
} qAORWc
}
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public long getLast(){ 9b%|^.B
return lastExecuteTime; [yvt1:q
} LV\ieM
public void run(){ Un\Ubqi0
long now = System.currentTimeMillis(); \gP. \
if ((now - lastExecuteTime) > executeSep) { /pU|ZA.z'2
//System.out.print("lastExecuteTime:"+lastExecuteTime); d}VALjXHX!
//System.out.print(" now:"+now+"\n"); t.L4%1OF
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); DA=qeVBg
lastExecuteTime=now; :@;6
executeUpdate(); IO6MK&R
} #AvEH=:
else{ -[<vYxX:h:
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); K+-z Y[3
} N+hedF@ZU
} *LEu=3lp%>
} 3FuCW
//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 c+wuC,
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类写好了,下面是在JSP中如下调用。 ]'6'<S
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<% ysl8LK
CountBean cb=new CountBean(); i.F8
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); gu!](yEgl
CountCache.add(cb); [JZ h*A
out.print(CountCache.list.size()+"<br>"); Eh
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CountControl c=new CountControl(); !^]q0x
c.run(); +#9xA6,AE
out.print(CountCache.list.size()+"<br>"); {sl~2#,}b1
%>