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: a0r"N[&
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CountBean.java t_mIOm)S%
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/* XL7h}
* CountData.java lu Q~YjH
* Mq';S^
* Created on 2007年1月1日, 下午4:44 cuOvN"nuNj
* %Uz(Vd#K
* To change this template, choose Tools | Options and locate the template under =8U&[F
* the Source Creation and Management node. Right-click the template and choose Q:J^"
* Open. You can then make changes to the template in the Source Editor. >X*Mio8P#
*/ sz9L8f2
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package com.tot.count; Z7 E
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/** re> rr4@
* DTWD|M
* @author _X@v/sAy
*/ '\jd#Kn'h
public class CountBean { JxyB(
private String countType; % YOndIS:
int countId; A*W)bZs.
/** Creates a new instance of CountData */ 6e7{Iy
public CountBean() {} DxJX+.9K9
public void setCountType(String countTypes){ 'Ei;^Y 1e
this.countType=countTypes; @)SL_9
} aZ\UrV4,
public void setCountId(int countIds){ =4 h+
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this.countId=countIds; ~c6}
} fGmT_C0t
public String getCountType(){ SNY~9:;]f
return countType; *Q1~S]g
} ]9\!;Bz^J
public int getCountId(){ bXS:x
return countId; c6Y\n%d&
} HF3f)}l$
} W_0>y9?
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CountCache.java ?
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/* *Vho?P6y\Y
* CountCache.java .!JVr"8
* 4
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* Created on 2007年1月1日, 下午5:01 OgX6'E\E
* ETB6f
* To change this template, choose Tools | Options and locate the template under $0arz{Oh
* the Source Creation and Management node. Right-click the template and choose +f[ED4E>'(
* Open. You can then make changes to the template in the Source Editor. !0N7^Z"gtz
*/ 37;$-cFE
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package com.tot.count; *cyeO*
import java.util.*; a
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/** OQ9x*TmK
* M,ir`"s
* @author : }`-B0
*/ -,["c9'3
public class CountCache { @^uH`mc
public static LinkedList list=new LinkedList(); 8uA,iYD
/** Creates a new instance of CountCache */ O@YTAT&d#
public CountCache() {} Z{H5oUk
public static void add(CountBean cb){ 5O`dO9g}$
if(cb!=null){ Hk|0HL
list.add(cb); 7#wn<HDY%
} 8XsguC
} f3UXCp
} hTwA%
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CountControl.java ApjOj/
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/* R6=$u{D
* CountThread.java ,\v91 Rp~?
* {aM<{_v
* Created on 2007年1月1日, 下午4:57 \lSU
* _!|/
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* To change this template, choose Tools | Options and locate the template under pJ
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* the Source Creation and Management node. Right-click the template and choose Pzb|t+"$
* Open. You can then make changes to the template in the Source Editor. MCdx?m3]
*/ WKSPBT;
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package com.tot.count; mA{~PpSb
import tot.db.DBUtils; RN@ctRS
import java.sql.*; h`3eu;5)
/** =w$}m_AM
* w}CmfR
* @author 5^j45'%I
*/ xzx$TUL
public class CountControl{ T,$WlK
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private static long lastExecuteTime=0;//上次更新时间 kCXdGhb
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Y F*OU"2U
/** Creates a new instance of CountThread */ I<A6Z&*un
public CountControl() {} tlA"B{7
public synchronized void executeUpdate(){ gR@C0
Connection conn=null; y_.!!@,
PreparedStatement ps=null; QFIL)'K
try{ +Y+Y6Ac[}
conn = DBUtils.getConnection(); ){Ob,LEU&
conn.setAutoCommit(false); @9&P~mo/
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Y \:0Ev
for(int i=0;i<CountCache.list.size();i++){ \Vl`YYjZ
CountBean cb=(CountBean)CountCache.list.getFirst(); Jnv@.
CountCache.list.removeFirst(); |c`w'W?C6
ps.setInt(1, cb.getCountId()); > ,DbNmi
ps.executeUpdate();⑴ (L`j0kPN
//ps.addBatch();⑵ =V^.}WtO
} B7"PIkk;
//int [] counts = ps.executeBatch();⑶ n!qV> k9Y
conn.commit(); H}:LQ~_2
}catch(Exception e){ )>c>oMgl
e.printStackTrace(); [=|jZVhT
} finally{ IVW1]y
try{ i.:. Y
if(ps!=null) { w/L `
ps.clearParameters(); "al`$ %(
ps.close(); }E_#k]#*
ps=null; o`.R!wm:W
} )+Oujt
}catch(SQLException e){} h`MF#617
DBUtils.closeConnection(conn); _wdG|{px
} pNRk.m]
} "gD-8C3
public long getLast(){ fJWC)E
return lastExecuteTime; F9*g=
} *x)8fAr
public void run(){ TW^/sx
long now = System.currentTimeMillis(); ^S6u<,
if ((now - lastExecuteTime) > executeSep) { PpsIhMq@
//System.out.print("lastExecuteTime:"+lastExecuteTime); @ps1Dr4s
//System.out.print(" now:"+now+"\n"); 1 tR_8lC
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); UswZG^Wh
lastExecuteTime=now; Zec <m8~
executeUpdate(); 6b!F 1
} JBnKK
else{ ~g7l8H67
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "4%"&2L
} *]i!fzI']
} 5 Qoew9rA
} b2@VxdFN
//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 NuU9~gSQ
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类写好了,下面是在JSP中如下调用。 98.>e
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<% sFBneBub
CountBean cb=new CountBean(); &[hLzlrg
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); vp(;W,ba:|
CountCache.add(cb); =LTmr1?
out.print(CountCache.list.size()+"<br>"); *kIc9}
CountControl c=new CountControl(); =f(cH152T
c.run(); $TI5vhQ
out.print(CountCache.list.size()+"<br>"); +<prgP`v
%>