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: @"__2\ 0
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CountBean.java .T\_4C
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/* R/Z
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* CountData.java d34BJ<
* <#~n5W{l
* Created on 2007年1月1日, 下午4:44 *^[j6
* /a?qtRw
* To change this template, choose Tools | Options and locate the template under g[$4a4X
* the Source Creation and Management node. Right-click the template and choose G-eSHv
* Open. You can then make changes to the template in the Source Editor. *I9O+/,
*/ /MZ^;XG
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package com.tot.count; W.Z`kH *B
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/** Cxra(!&
* |(3"_
* @author t$g@+1p4
*/ Sjo7NR^#e
public class CountBean { 2(H-q(
private String countType; HMmB90P`
int countId; ($'5xPb
/** Creates a new instance of CountData */ e\r%"~v
public CountBean() {} ~}RfepM
public void setCountType(String countTypes){ }No8t o
this.countType=countTypes; T(
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} ~|( eh9
public void setCountId(int countIds){ FwUgMR*xq
this.countId=countIds; `T3B
} #*X\pjZ
public String getCountType(){ Ticx]_+~T
return countType; bW^C30m
} {Bz E
public int getCountId(){ 0sI7UK`m
return countId; FaQc@4%o
} uYC1}Y5N
} nYE%@Up
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CountCache.java n50WHlMtt
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/* SM\qd4
* CountCache.java i>e?$H,/
* %S/?Ci
* Created on 2007年1月1日, 下午5:01 1P?|.W_^1
* Z}S7%m
* To change this template, choose Tools | Options and locate the template under H{hzw&dZ<P
* the Source Creation and Management node. Right-click the template and choose YO9;NA{sH
* Open. You can then make changes to the template in the Source Editor. _$i)bJ
*/ &yG5w4<
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package com.tot.count; Q2[;H!"
import java.util.*; yt<h!k$ _P
/** +`tk LvM
* Q)im2o@z
* @author |enb5b78
*/ zPN:)
public class CountCache { Raf(m,o(
public static LinkedList list=new LinkedList(); 9e Fj+
/** Creates a new instance of CountCache */ &%m%b5
public CountCache() {} es<8"CcP
public static void add(CountBean cb){ :l&Yq!5
if(cb!=null){ SG]Sx4fg,Y
list.add(cb); ps UT2
} \,pObWm
} 'qJ0338d#U
} \rd%$hci
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CountControl.java r1:CHIwK
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/* rn/~W[
* CountThread.java .3&(Y
* &f2:aT)
* Created on 2007年1月1日, 下午4:57 54=*vokX_
* }(7TiCwd
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose h"nhDART<
* Open. You can then make changes to the template in the Source Editor. R3%%;` c=
*/ *wx95?H0Z
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package com.tot.count; AEkjy h\
import tot.db.DBUtils; Da8
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import java.sql.*; 4w)>}
/** 4AMe>s
* U~USwUzgY
* @author 3&mpn,
*/ Ft38)T"2R\
public class CountControl{ Lv#0-+]$Bt
private static long lastExecuteTime=0;//上次更新时间 mm;sf
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 w!'y,yb%
/** Creates a new instance of CountThread */ %%NT m
public CountControl() {} xkv%4H>
public synchronized void executeUpdate(){ XJ5@/BW
Connection conn=null; '6;
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PreparedStatement ps=null; [S1 b\f#
try{ \*[DR R0
conn = DBUtils.getConnection(); huW,kk<]y
conn.setAutoCommit(false); `jSe gG'
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); p6V#!5Q
for(int i=0;i<CountCache.list.size();i++){ ~6IY4']m*
CountBean cb=(CountBean)CountCache.list.getFirst(); k||dX(gl
CountCache.list.removeFirst(); .>z1BP:(
ps.setInt(1, cb.getCountId()); [!4xInS
ps.executeUpdate();⑴ ?5J>]: +ZZ
//ps.addBatch();⑵ ',K:.$My
} iI`vu
//int [] counts = ps.executeBatch();⑶ rVP{ ^Jdo
conn.commit(); 'v9M``
}catch(Exception e){ Bal e_s^
e.printStackTrace(); 3!$+N\ #w
} finally{ =fJU+N+<
try{ D, Gv nfY
if(ps!=null) { h3-^RE5\`S
ps.clearParameters(); -+Ot'^
ps.close(); OF03]2j7<|
ps=null; }xBDyr63
} bN7m[GRO.
}catch(SQLException e){} A*~G[KC3(
DBUtils.closeConnection(conn); n_Qua|R
} Tgax ZW
} Je,o(:
public long getLast(){ ]YtN6Rq/
return lastExecuteTime; ]tf`[bINP
} OGIv".~s4
public void run(){ J/Lf(;C_
long now = System.currentTimeMillis(); L]8z6]j*
if ((now - lastExecuteTime) > executeSep) { 4\5i}MIS0
//System.out.print("lastExecuteTime:"+lastExecuteTime); J]#rh5um
//System.out.print(" now:"+now+"\n"); Z,O*p,Gzn
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); FzcXSKHV%
lastExecuteTime=now; H(gY=
executeUpdate(); I;-Y2*
} oyr b.lu/
else{ QkC*om'/!
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); v0VQ4>
} @&Z^WN,x
} tH4q*\U
} _ xTpW
//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 ~TsRUT
/#
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类写好了,下面是在JSP中如下调用。 wN58uV '
ox%j_P9@:
<% AH :uG#
CountBean cb=new CountBean(); e4,SR(O>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); yQMwt|C4
CountCache.add(cb); Zp^O1&\SK?
out.print(CountCache.list.size()+"<br>"); v/9DD% An
CountControl c=new CountControl(); H`'a|Y
c.run(); w7.,ch
out.print(CountCache.list.size()+"<br>"); 1Acs0`3
%>