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: O]XdPH20
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CountBean.java :FUefW m
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/* BJ
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* CountData.java ^hc&rD)_
* JB_<Haj
* Created on 2007年1月1日, 下午4:44 &?#,rEw<x
* mr4W2Z@L
* To change this template, choose Tools | Options and locate the template under lJ'.1Z&
* the Source Creation and Management node. Right-click the template and choose Q?Y\WD
* Open. You can then make changes to the template in the Source Editor. 1feZ`P;
*/ {hXIP`
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package com.tot.count; ;x|E}XD
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/** "<#-#j
* WRq:xDRn0
* @author 7jj.maK
*/ h6yXW!8
public class CountBean {
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private String countType; n%SR5+N"
int countId; 6 aE:vR2
/** Creates a new instance of CountData */ udEJo~u
public CountBean() {} j[^(<R8
public void setCountType(String countTypes){ a-A>A_.
this.countType=countTypes; rzR=% >
} 86bRfW'
public void setCountId(int countIds){ ?^8CD.|
this.countId=countIds; xbN)z
} ]\qbe
public String getCountType(){ Eeumi#$Z
return countType; 2/T4.[`t
} k^JV37;bl
public int getCountId(){ c]eDTbXd
return countId; !4"!PrZDB
} zq:+e5YT?T
} 0ESxsba
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CountCache.java 4(h19-V
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/* \),DW)
* CountCache.java CQ4MQ<BJ.
* #:~MtV
* Created on 2007年1月1日, 下午5:01 '=M4(h
* rx$B(z(c
* To change this template, choose Tools | Options and locate the template under +b9gP\Hke
* the Source Creation and Management node. Right-click the template and choose /M0A9ZT[
* Open. You can then make changes to the template in the Source Editor. \!+#9sq0
*/ ![>j`i
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package com.tot.count; ~36)3W[4
import java.util.*; K;,_P5J%
/** P,QI-,
* y7x&/2
* @author tK|jh
*/ pX\Y:hCug
public class CountCache { *_qW;l7
public static LinkedList list=new LinkedList(); E#0_y4
/** Creates a new instance of CountCache */ >Q`\|m}x)Q
public CountCache() {} )jS9p~FS
public static void add(CountBean cb){ hk +@ngh%
if(cb!=null){ ]c Or$O*
list.add(cb); jMpV c
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} D~(f7~c%
} LU7ia[T
} \8KAK3i'
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CountControl.java rryC^Vma
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/* 2b[R^O}
* CountThread.java qwERy{]Sp;
* :4 &q2-
* Created on 2007年1月1日, 下午4:57 \\Z{[{OZ
* "%mu~&Ga
* To change this template, choose Tools | Options and locate the template under cnm*&1EzV
* the Source Creation and Management node. Right-click the template and choose Y]9AC
* Open. You can then make changes to the template in the Source Editor. kn^?.^dVX
*/ hB!>*AsG
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package com.tot.count; VJ8"Q
import tot.db.DBUtils; ]1^F
import java.sql.*; "1-gMob
/** (]Pr[xB
* ++m^z` D
* @author lCX*Q{s22
*/ 77]6_
public class CountControl{ HW@r1[Y
private static long lastExecuteTime=0;//上次更新时间 )Rlh[Y& r
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 1 m>x5Dbk!
/** Creates a new instance of CountThread */ 68!W~%?pR
public CountControl() {} &4dh $w]q
public synchronized void executeUpdate(){ 'Avp16zg
Connection conn=null; 1luRTI8^
PreparedStatement ps=null; }Qqi013E L
try{ &>YdX$8x
conn = DBUtils.getConnection(); ;PA^.RB
conn.setAutoCommit(false); [yEH!7
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); C{5bG=Sg~
for(int i=0;i<CountCache.list.size();i++){ R9!GDKts%
CountBean cb=(CountBean)CountCache.list.getFirst(); ; xz}]@]Ar
CountCache.list.removeFirst(); O1
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ps.setInt(1, cb.getCountId()); Z
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ps.executeUpdate();⑴ I?z*.yA*
//ps.addBatch();⑵ GY3g`M
} KysJ3G.k\
//int [] counts = ps.executeBatch();⑶ )J"*[[e
conn.commit(); >$g+Gx\v4
}catch(Exception e){ |)4aIa
e.printStackTrace(); TA~FP#.
} finally{ .*x |TPv{
try{ vhEXtjL
if(ps!=null) { d4 r@Gx%BE
ps.clearParameters(); nXg:lCI-uu
ps.close(); @ uF$m/g
ps=null; z0v|%&IK