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: (XmmbAbVom
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CountBean.java QJ(%rvn3
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/* YCltS!k
* CountData.java d[,Rgdd@I
* Sv /P:r
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* Created on 2007年1月1日, 下午4:44 K'J_AMBL
* I@6+AU~,6
* To change this template, choose Tools | Options and locate the template under v9Ii8{ca|
* the Source Creation and Management node. Right-click the template and choose pMHl<HH
* Open. You can then make changes to the template in the Source Editor. \zg R]|
*/ eg}g}a
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package com.tot.count; ~&T U
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/** JFX}))7
* ~^a>C
* @author upaP,ik}~
*/ V.*M;T\i
public class CountBean { *1kFy_Gx
private String countType; iY07lvG<
int countId; Qw2-Vv4!"
/** Creates a new instance of CountData */ jGz~}&B
public CountBean() {} .G\](%
public void setCountType(String countTypes){ wods
this.countType=countTypes; /KOI%x
} u_' -vZ_
public void setCountId(int countIds){ t*H2;|zn_
this.countId=countIds; y@I9>}"y
} ):>?N`{V
public String getCountType(){ k6ry"W3
return countType; YAT@xZs-
} n5UUoBv
public int getCountId(){ /fb}]e]N
return countId; mJ<`/p?:
} <#?dPDMG.*
} Cfmd*,
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CountCache.java ^0| :
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/* dFw+nGN
* CountCache.java b5=|1SjR
* j#2Xw25
* Created on 2007年1月1日, 下午5:01 TaYl[I
* |\uj(|
* To change this template, choose Tools | Options and locate the template under B3&C&o.h
* the Source Creation and Management node. Right-click the template and choose 5U7,,oyh
* Open. You can then make changes to the template in the Source Editor. BT8)t.+pv
*/ :s_.K'4?a
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package com.tot.count; m0ra
import java.util.*; }YdC[b$j^
/** &2XH.$Q
* mm+V*L{x
* @author 5)XUT`;'){
*/ ynM~&]fk#k
public class CountCache { &t<gK
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public static LinkedList list=new LinkedList(); ^uUA41o`eJ
/** Creates a new instance of CountCache */ _"Ym]y28li
public CountCache() {} lG'D/#
public static void add(CountBean cb){ IKP_%R8.
if(cb!=null){ WM|G/'q
list.add(cb); fT Pm
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} iZfZF
} Sdmz(R
} F*J1w|)F0
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CountControl.java t adeG
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/* Pv2uZH(
* CountThread.java q>BJ:_I
i
* 9:@Xz5
* Created on 2007年1月1日, 下午4:57 {f`Y\_r$@
* }WFI/W'
* To change this template, choose Tools | Options and locate the template under MF'Z?M
* the Source Creation and Management node. Right-click the template and choose yOEy3d=*
* Open. You can then make changes to the template in the Source Editor. #N`G2}1J
*/ `mteU"{bx
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package com.tot.count; auAz>6L
import tot.db.DBUtils; k;cX,*DIn
import java.sql.*; 2#5Q~
/** )cizd^{
* .qohHJ&
* @author na
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*/ Xn=yC Pi
public class CountControl{ kB CU+FC
private static long lastExecuteTime=0;//上次更新时间 Z ;rM@x
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 H*k\C
/** Creates a new instance of CountThread */ }(u:K}8
public CountControl() {} PRiE2Di2S
public synchronized void executeUpdate(){ kZ@UQ{>`
Connection conn=null; ${z#{c1
PreparedStatement ps=null; MMKN^a"GA
try{ V1M|p!
conn = DBUtils.getConnection(); OW};i|
conn.setAutoCommit(false); meV Z_f/
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); <B|b'XVH2
for(int i=0;i<CountCache.list.size();i++){ b`+yNf
CountBean cb=(CountBean)CountCache.list.getFirst(); PQlA(v+S
CountCache.list.removeFirst(); Tf5m
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ps.setInt(1, cb.getCountId()); T:kliM"z
ps.executeUpdate();⑴ 4Us,DS_/
//ps.addBatch();⑵ In?+
} /
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//int [] counts = ps.executeBatch();⑶ S'|PA7a}h
conn.commit(); o NA ]G]
}catch(Exception e){ g`'!Vgd?M[
e.printStackTrace(); Brs6RkRf
} finally{ ~fD\=- S1
try{ DTA$,1JuD
if(ps!=null) { zdPJ>PNU
ps.clearParameters(); F5:xrcyC
ps.close(); L bJf5xdi
ps=null; 2Cy,#X%j>
} z@e(y@
}catch(SQLException e){} s'N <
DBUtils.closeConnection(conn); [!;sp~
} ]'%
iR
} ;Ngk"5
public long getLast(){ g,iW^M
return lastExecuteTime; ,rN$ah$CL
} _Cz98VqRk
public void run(){ hfIP
long now = System.currentTimeMillis(); }xr0m+/
if ((now - lastExecuteTime) > executeSep) { V Zbn@1
//System.out.print("lastExecuteTime:"+lastExecuteTime); /"`hz6rIv
//System.out.print(" now:"+now+"\n"); mYo~RXKGF
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); L9e<hRZ$
lastExecuteTime=now; 3HuocwWbz
executeUpdate(); *ezMS
} u8JH~b
else{ _y6iR&&x
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); rlh:|#GTJ
} {06-h %qr
} HFjSM~
} 8*b{8%<K
//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 2dHO!A$RF
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类写好了,下面是在JSP中如下调用。 7t<h 'g2
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<% dr"$@
CountBean cb=new CountBean(); nl(GoX$vRQ
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 4=^Ha%l
CountCache.add(cb); bnL!PsG$K,
out.print(CountCache.list.size()+"<br>"); g?xXX
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CountControl c=new CountControl(); I:DAn!N-A*
c.run(); FsOJmWZ
out.print(CountCache.list.size()+"<br>"); w3
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