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: @8 c@H#H
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CountBean.java z@UH[>^gj
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/* AM?ZhM
* CountData.java \GHj_r
* k@fxs]Y_L
* Created on 2007年1月1日, 下午4:44 )r"R
* 15_"U+O(/
* To change this template, choose Tools | Options and locate the template under @B0fRG y
* the Source Creation and Management node. Right-click the template and choose @8\0@[]
* Open. You can then make changes to the template in the Source Editor. v3[ZPc;;
*/ W
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package com.tot.count; +mG"m hF
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/** WMKxGZg"
* lre(]oBXA
* @author \=RV?mI3?
*/ _H U>T
public class CountBean { V9ZM4.,OCN
private String countType; 6 [bQ'Ir^8
int countId; N\ <riS9
/** Creates a new instance of CountData */ _l)3pm6
public CountBean() {} L|{v kkBo
public void setCountType(String countTypes){ 6a9:P@tY
this.countType=countTypes; }cUO+)!Y
} jKcl{',
public void setCountId(int countIds){ }`Wo(E}O
this.countId=countIds; >G1]#'6;
} DCa=o
public String getCountType(){ ;]R5:LbXS
return countType; p}~Sgi
} ymrnu-p o
public int getCountId(){ ~9YEb
return countId; ?pQ0*
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} 86KK Y2
} %*q^i}5)E
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CountCache.java
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/* ?!"pzDg
* CountCache.java q+qF;7dN@
* [fwk[qFa
* Created on 2007年1月1日, 下午5:01 K
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* uCt?(E>
* To change this template, choose Tools | Options and locate the template under LCXWpUj~
* the Source Creation and Management node. Right-click the template and choose Cw!tB1D
* Open. You can then make changes to the template in the Source Editor. "KCG']DF
*/ I=Y_EjZD
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package com.tot.count; k g(}%Ih
import java.util.*; asQ^33g z
/** SPe%9J+
* cAx$W6S
* @author ,ZYPffu<*
*/ _^?_Vb
public class CountCache { nql{k/6
public static LinkedList list=new LinkedList(); #$ka.Pj
/** Creates a new instance of CountCache */ HOPl0fY$L
public CountCache() {} VeEa17g&
public static void add(CountBean cb){ RHd no C
if(cb!=null){ Dm?:j9o]g
list.add(cb); B}zBbB
} 2.{zfr
} vytO8m%U
} `uDOIl
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CountControl.java wU/fGg*M2
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/* <h|&7
* CountThread.java 6c>:h)?
* <RbsQ^U
* Created on 2007年1月1日, 下午4:57 ^VnnYtCRz
* ES(qu]CjI
* To change this template, choose Tools | Options and locate the template under Wj)v,v2&
* the Source Creation and Management node. Right-click the template and choose RP 6<#tq,
* Open. You can then make changes to the template in the Source Editor. )2^r
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*/ j:8Pcx
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package com.tot.count; WK0IagYw
import tot.db.DBUtils; F *U.cJ%
import java.sql.*; 3C;;z
/** 6xr%xk2E
* z t
* @author }0/l48G
*/ cl{mRt0
public class CountControl{ WS@"8+re;
private static long lastExecuteTime=0;//上次更新时间 osO\ib_%
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 EIpz-"S
/** Creates a new instance of CountThread */ NTGWI$
public CountControl() {} EZp >Cf7
public synchronized void executeUpdate(){ mTL`8hv?
Connection conn=null; ;eW)&qzK
PreparedStatement ps=null; 8F$]@0v`%
try{ }QCn>LXE
conn = DBUtils.getConnection(); dtG>iJ
conn.setAutoCommit(false); gL@]p
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); O"X7 DgbC
for(int i=0;i<CountCache.list.size();i++){ [1Qg *
CountBean cb=(CountBean)CountCache.list.getFirst(); +'w6=qI
CountCache.list.removeFirst(); !4z vkJO
ps.setInt(1, cb.getCountId()); [_KOU2
ps.executeUpdate();⑴ zTq"kxn'
//ps.addBatch();⑵ %5n'+- XVj
} e?o/H
//int [] counts = ps.executeBatch();⑶ p&2d&;Qo0
conn.commit(); (_N(K`4#W
}catch(Exception e){ U9\w)D|+eE
e.printStackTrace(); s|[qq7
} finally{ <&((vrfa
try{ qd'Z|'j
if(ps!=null) { ts,V+cEA
ps.clearParameters(); VHLNJnA
ps.close(); Hh&qjf
ps=null; _$ 8:\[J
} JPZH%#E(
}catch(SQLException e){}
# xX
DBUtils.closeConnection(conn); B oiS
} M D&7k,!
} oykb8~u}}
public long getLast(){ JZ>
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return lastExecuteTime; \nTV;@F
} YKOj
public void run(){ {=,I>w]T|W
long now = System.currentTimeMillis(); +KTHZpp!c2
if ((now - lastExecuteTime) > executeSep) { .jbxA2
//System.out.print("lastExecuteTime:"+lastExecuteTime); CFoR!r:X
//System.out.print(" now:"+now+"\n"); alsD TQ'
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); \IqCC h
lastExecuteTime=now; n7/&NiHxv/
executeUpdate(); >$a;+v
} g<$2#c}
else{ I;UT;/E2
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); }YM[aq?6
} m G+=0Rn^
} CZ{7?:^f
} ^/}&z