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: 3?R QPP
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CountBean.java YKsc[~
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/* +B0G[k7
* CountData.java @UidQX"b
* jL[
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* Created on 2007年1月1日, 下午4:44 AE"E($S`
* d(-$ {
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* To change this template, choose Tools | Options and locate the template under eZWR)+aq
* the Source Creation and Management node. Right-click the template and choose 2dF:;k k
* Open. You can then make changes to the template in the Source Editor. 0fTEb%z8
*/ TGJ\f
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package com.tot.count; 9w! G
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/** =_L
* @GiR~bKZ
* @author U0M>A
*/ T?Dq2UW
public class CountBean { hoQ?8}r:
private String countType; p3NTI /-
int countId; rGe^$!QB
/** Creates a new instance of CountData */ =!`\=!y
public CountBean() {} ,T|%vqbmw
public void setCountType(String countTypes){ UT9=S21
this.countType=countTypes; 6GD Uo}.
} oEWx9c{~$
public void setCountId(int countIds){ ^8V cm*
this.countId=countIds; ,A>i)brc
} Qp?n0WXZ
public String getCountType(){ q$Ol"K@
return countType; r]=3aebR.
} N3};M~\
public int getCountId(){ N
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return countId; 2,>q(M6,EA
} +"]'h~W
} lE54RX}e4
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CountCache.java _l?5GLl_F$
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/* (!';
* CountCache.java g"3h#SMb
* (WW,]#^
* Created on 2007年1月1日, 下午5:01 *ihg'
* 9tS&$-
* To change this template, choose Tools | Options and locate the template under \~
* the Source Creation and Management node. Right-click the template and choose r)mm8MI!Z
* Open. You can then make changes to the template in the Source Editor.
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*/ T
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package com.tot.count; )_EobE\
import java.util.*; 0zpP$q$
/** eT+MN`
* 4(JxZ49
* @author B`hxF(_p/
*/ #k=!>%+E
public class CountCache { zck)D^,aO
public static LinkedList list=new LinkedList(); qc\o>$-:`
/** Creates a new instance of CountCache */ cQPH le2
public CountCache() {} i=2+1;K
public static void add(CountBean cb){ vS<;:3
if(cb!=null){ j)F~C8*
list.add(cb); i6m;2 UAa
} XB;;OP12
} 5<w0*~Zd~
} fWm;cDM
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CountControl.java kd\yHI9A
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/* $]81 s`
* CountThread.java `bC_J,>_
* F"23>3
* Created on 2007年1月1日, 下午4:57 hGus!p"lw
* )QZ?Bf
* To change this template, choose Tools | Options and locate the template under 5. l&nt'
* the Source Creation and Management node. Right-click the template and choose R4qk/@]t
* Open. You can then make changes to the template in the Source Editor. ~`N|sI,
*/ [=E<iPl
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package com.tot.count; WJ9u3+
import tot.db.DBUtils; i&LbSxUh9
import java.sql.*; 9) YG)A~<
/** qbAoab53
* A`r&"i OKA
* @author !E7/:t4
*/ 2dI:],7
public class CountControl{ rz.`$b
private static long lastExecuteTime=0;//上次更新时间 Q'=!1^&
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 *@Qt*f
/** Creates a new instance of CountThread */ >$"bwr}'4B
public CountControl() {} pI^n("|
public synchronized void executeUpdate(){ uw<Ruy
Connection conn=null; Lq&xlW
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PreparedStatement ps=null; %Bo Jt-v
try{ z`_N|iEd
conn = DBUtils.getConnection(); '",5Bu#C
conn.setAutoCommit(false); _88~uYG
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7xd}J(l
for(int i=0;i<CountCache.list.size();i++){ eeX)JC0A
CountBean cb=(CountBean)CountCache.list.getFirst(); FVpe*]
CountCache.list.removeFirst(); )i>KYg w
ps.setInt(1, cb.getCountId()); Yp;x
ps.executeUpdate();⑴ ``\H'^{B
//ps.addBatch();⑵ L`p[Dq.
} Gce_gZH7{
//int [] counts = ps.executeBatch();⑶ %q!nTGU~
conn.commit(); /;>EyWW
}catch(Exception e){ bVrvb`0
e.printStackTrace(); fGfv{4R
} finally{ 1GNAx\(
try{ w])Sz*J
if(ps!=null) { s6
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ps.clearParameters(); &KB{,:)?
ps.close(); &vn9l#\(
ps=null; a|>MueJ
} {%$=^XO
}catch(SQLException e){} Cm&itG
DBUtils.closeConnection(conn); $200?[
} &V;a:
} p[$I{F*a
public long getLast(){ 7D^A:f
return lastExecuteTime;
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} r5"/EMieh
public void run(){ *SW,pHYnLb
long now = System.currentTimeMillis(); N$+"zJmw&