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: #'s$6gT=
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CountBean.java pK3A/ry<
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/* wX]$xZ!s
* CountData.java [d[w/@
* 2'S&%UyP
* Created on 2007年1月1日, 下午4:44 {ac$4#Bp[B
* ]}rNxT4<
* To change this template, choose Tools | Options and locate the template under T@yQOD7
* the Source Creation and Management node. Right-click the template and choose -GPBX?
* Open. You can then make changes to the template in the Source Editor. iG6]Pr|;e
*/ {HEWU<5
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package com.tot.count; iXnXZ|M
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/** (y>N\xS9
* d[3me{Rs
* @author ,jg #^47I
*/ nA,=g'7S
public class CountBean { ,R`CAf%*
private String countType; "73y}'
int countId; C+s/KA%
/** Creates a new instance of CountData */ lUEbxN
public CountBean() {} Nz`8)Le
public void setCountType(String countTypes){ +-|""`I1I
this.countType=countTypes; ,#ZPg_x?1
} 0@"'SKq
public void setCountId(int countIds){ 'xqyG XI
this.countId=countIds; +S(# 7
} 3/n?g7B
public String getCountType(){ ?; W"=I*3
return countType; o[!o+M
} YTefEG]|q
public int getCountId(){ # `E
return countId; Cb{D[
} iptA#<Yj
} L!Y|`P#Yr
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CountCache.java M,H8ZO:R
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/* :[n~(~7?
* CountCache.java ,nteIR'??
* u?72]?SM
* Created on 2007年1月1日, 下午5:01 /r~2KZE
* <p b
* To change this template, choose Tools | Options and locate the template under _D4qnb@
* the Source Creation and Management node. Right-click the template and choose ZSQiQ2\)
* Open. You can then make changes to the template in the Source Editor. Sr6'$8#>Y
*/ fL2P6N@
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package com.tot.count; " C0[JdZ
import java.util.*; ON\bD?(VY
/** $EFS_*<X
* WMtFXkf6"
* @author #h=V@Dh
*/ geyCS3
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public class CountCache { IwnDG;+Ap
public static LinkedList list=new LinkedList(); G^d3$7
/** Creates a new instance of CountCache */ /P,1KVQPh
public CountCache() {} cOP'ql{"
public static void add(CountBean cb){ e#HPU
if(cb!=null){ 5CK\Z'c~!
list.add(cb); D*-
} 3'.3RKV
} R&W%E%uj
} bDWLHdu
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CountControl.java $||WI}k3V
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/* }>@SyE'Q
* CountThread.java Gn
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* 3<XuJ1V&
* Created on 2007年1月1日, 下午4:57 9~~NxWY%x
* 1<m`38'
* To change this template, choose Tools | Options and locate the template under L-?ty@-i
* the Source Creation and Management node. Right-click the template and choose x*z[(0g!
* Open. You can then make changes to the template in the Source Editor. Jt]RU+TB
*/ QYo04`Rl
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package com.tot.count; kfas4mkc
import tot.db.DBUtils; N@PwC(
import java.sql.*; p}pRf@(`\
/** #>aq'47j
* +g?uvXC&
* @author > .NLmzUX
*/ "G>d8GbIh
public class CountControl{ n! 5(Z5=
private static long lastExecuteTime=0;//上次更新时间 r*b+kSh
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9RlJf=Z#H
/** Creates a new instance of CountThread */ afX|R
public CountControl() {} ((]i}s0S
public synchronized void executeUpdate(){ ~`BkCTT
Connection conn=null; Ich^*z(F$
PreparedStatement ps=null; @*vVc`;
try{ M2cGr
conn = DBUtils.getConnection(); Ti)Me-g
conn.setAutoCommit(false); cu>(;=
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }6a}8EyFP
for(int i=0;i<CountCache.list.size();i++){ bEcN_7
CountBean cb=(CountBean)CountCache.list.getFirst(); =!SV;^-q
CountCache.list.removeFirst(); 1]''@oh{6U
ps.setInt(1, cb.getCountId()); Ld.9.d]
ps.executeUpdate();⑴ 5T.U=_ag
//ps.addBatch();⑵ $>#0RzU
} u4FD}nV
//int [] counts = ps.executeBatch();⑶ !o`7$`%Wz\
conn.commit(); (^iF)z
}catch(Exception e){ [r"Oi|
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e.printStackTrace();
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} finally{ c?CfM>
try{ P x Q] $w
if(ps!=null) { !aUYidd
ps.clearParameters(); v*Gd=\88
ps.close(); >D u=(pB
ps=null; %]7 6u7b/
} >#:SJ?)`T
}catch(SQLException e){} FW8Zpr!u
DBUtils.closeConnection(conn); (]cL5o9
} (
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} TsT5BC63
public long getLast(){ 1LS1 ZY
return lastExecuteTime; f$^wu~
} G 3U[)("
public void run(){ X[Ufq^fyA
long now = System.currentTimeMillis(); /v9qrZ$$
if ((now - lastExecuteTime) > executeSep) { j|pTbOgk%
//System.out.print("lastExecuteTime:"+lastExecuteTime); TOG4=y-N
//System.out.print(" now:"+now+"\n"); ?`e@ o?
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); T5T%[Gv
lastExecuteTime=now; a6vej
executeUpdate(); _ab8z]H
} !0lk}Uzkh
else{ N4,oO H~
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); F<{,W-my `
} Az y`4
} P]n0L4c
} 0fX` >-X
//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 8GW+:
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类写好了,下面是在JSP中如下调用。 yq|yGf(4&
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<% E0RqY3
CountBean cb=new CountBean(); 4o M~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Lqxhy s
CountCache.add(cb); ^BLO}9A{P
out.print(CountCache.list.size()+"<br>"); 1_S]t[?I/
CountControl c=new CountControl(); nZnqXclzxn
c.run(); c=+%][21
out.print(CountCache.list.size()+"<br>"); V~*>/2+
%>