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: @:9Gs!!
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CountBean.java 3yKmuu!
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/* n@p@@
* CountData.java ={zTQ+7S`
* > ]^'h
* Created on 2007年1月1日, 下午4:44 uI/
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* G#GZt\)F
* To change this template, choose Tools | Options and locate the template under %NxQb'
* the Source Creation and Management node. Right-click the template and choose \>-
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* Open. You can then make changes to the template in the Source Editor. KRC"3Qt
*/ oIj=ba(n1
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package com.tot.count; U*$xR<8v
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/** @nY]S\if
* src+z#
* @author 5MAfuHq^
*/ ^F+7<$2
public class CountBean { TjEXR$:<
private String countType; =#S.t:HQ*
int countId; ;: 2U}p^-
/** Creates a new instance of CountData */ kY~4AH
public CountBean() {} j/*1zu8Y
public void setCountType(String countTypes){ XH$r(@Z\7
this.countType=countTypes; YiDO V)
} ,dCEy+
public void setCountId(int countIds){ bT^dtEr[
this.countId=countIds; WqCC4R,-
} Xi98:0<=
public String getCountType(){ 0yI1r7yNB+
return countType; hcj}6NXc
} _Ns EeKU
public int getCountId(){ VE|l;aXi
return countId; _V-K yK
} W-n4wIj"
} fx{8ERo
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CountCache.java $ItjVc@U
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/* 6`e7|ilh6
* CountCache.java Z)#UCoK!c
* a,c!#iyl3
* Created on 2007年1月1日, 下午5:01 9_?xAJ
* "+ou!YK+
* To change this template, choose Tools | Options and locate the template under <ukBAux,D
* the Source Creation and Management node. Right-click the template and choose
>Q\Kc=Q|
* Open. You can then make changes to the template in the Source Editor. E=p+z"Ui
*/ Y"GNJtsL "
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package com.tot.count;
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import java.util.*; 67II9\/
/** +O.-o/
* 2M-[x"\1/
* @author P9
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*/ &3[oM)-V
public class CountCache { ^es]jng`
public static LinkedList list=new LinkedList(); TJO$r6&
/** Creates a new instance of CountCache */ %M@K(Qu
public CountCache() {} Icnhet4
public static void add(CountBean cb){ l}))vf=i
if(cb!=null){ 27e!KG[&
list.add(cb); YB5"i9T2
} FvxM
} _s=H|#l
} _F;v3|`D@<
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CountControl.java ,twx4r^
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/* @Nek;xJ
* CountThread.java W&?Qs=@
* <OMwi9
* Created on 2007年1月1日, 下午4:57 "<!U
* aixX/se
* To change this template, choose Tools | Options and locate the template under JL1ajlm~
* the Source Creation and Management node. Right-click the template and choose WEimJrAn
* Open. You can then make changes to the template in the Source Editor. ^Co$X+
*/ qz-QVY,
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package com.tot.count; /o;M
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import tot.db.DBUtils; t<!;shH,s
import java.sql.*; j~Aq-8R=
/** kOYUxr.b
* w7V\_^&Id
* @author 7Q}pKq]P
*/ sS>b}u+v#!
public class CountControl{ %c }V/v_h
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %=`JWLLG
/** Creates a new instance of CountThread */ kJWg},-\
public CountControl() {} Hc)z:x;Sj
public synchronized void executeUpdate(){ {{?g%mQ6
Connection conn=null; Xu] ~vik
PreparedStatement ps=null; HC%Hbc~S_Q
try{ .A2$C|a*
conn = DBUtils.getConnection(); ,@`?I6nKy
conn.setAutoCommit(false); Ttluh
*
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 8D='N`cN+
for(int i=0;i<CountCache.list.size();i++){ Jj"{C]
CountBean cb=(CountBean)CountCache.list.getFirst(); k6(7G@@}
CountCache.list.removeFirst(); E(jZ Do
ps.setInt(1, cb.getCountId()); :
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ps.executeUpdate();⑴ g^'h4qOa
//ps.addBatch();⑵ ,&P
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} <+roY"
//int [] counts = ps.executeBatch();⑶ ->sxz/L
conn.commit(); mlnF,+s
}catch(Exception e){ UerbNz|
e.printStackTrace(); `^bP9X_a
} finally{ cm< #zu3~S
try{ 8>&@"j
if(ps!=null) { m8q4t,<J
ps.clearParameters(); va6Fp2n<1*
ps.close(); .uuhoqG0
ps=null; <RGH+4LF
} sT M;l,
}catch(SQLException e){} T6U/}&{O
DBUtils.closeConnection(conn); S
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} UVo`jb|>
o
} 2Y
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public long getLast(){ uU H4vUa
return lastExecuteTime; `JySuP2~/
} 36"n7
public void run(){ cb}"giXQTB
long now = System.currentTimeMillis(); (Xd8'-G$m
if ((now - lastExecuteTime) > executeSep) { ujU,O%.n
//System.out.print("lastExecuteTime:"+lastExecuteTime); Fc~G*Gz~Z|
//System.out.print(" now:"+now+"\n"); nf.Ox.kM)
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); -@pjEI
lastExecuteTime=now; VW-qQe
executeUpdate(); B~p%pTS+
} !J$r|IX5
else{ FlqGexY5
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); @!sK@&ow@%
} d54iZ`
} @(t3<g
} 1[%3kY-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 ?:(y
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类写好了,下面是在JSP中如下调用。 &@0~]\,D7
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<% 5S~ H[>A"
CountBean cb=new CountBean(); z$~x 2<
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); F9K%f&0 a
CountCache.add(cb); xye-Z\-t
out.print(CountCache.list.size()+"<br>"); g6GkA.!X$
CountControl c=new CountControl(); %~u]|q<{
c.run(); ^P)f]GQx
out.print(CountCache.list.size()+"<br>"); D|-]<r1"
%>