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: gS+X%
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CountBean.java ~][~aEat;V
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/* <J;O$S
* CountData.java 3$!QP
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* #Zm`*s`
* Created on 2007年1月1日, 下午4:44 PK:Lv15"r
* TRi#
* To change this template, choose Tools | Options and locate the template under FTZ=u0
* the Source Creation and Management node. Right-click the template and choose );.$`0
* Open. You can then make changes to the template in the Source Editor. crIF5^3Yby
*/ JU>~[yAP
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package com.tot.count; / 3N2?zS{
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/** _VT{2`|})
* 5qnei\~
* @author caQ1SV^{9
*/ d%P2V>P
public class CountBean { "mJo<i}
private String countType; l ubsL I
int countId; #EzhtuHxn
/** Creates a new instance of CountData */ Z{^!z
public CountBean() {} s9wzN6re
public void setCountType(String countTypes){ -t4:%-wv
this.countType=countTypes; *LB-V%{|'
} +yO) 3
public void setCountId(int countIds){ }h;Z_XF&
this.countId=countIds; G!I++M"
} {A0F/#M]
public String getCountType(){ %Y ZCdS
return countType; fxcE1=a
} 6-wpR
public int getCountId(){ "^$Ht`p[
return countId; v"1&xe^4
} 9Ad%~qciY
} 1!1JT;gG^9
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CountCache.java Jq` Dvz
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/* |-=-/u1
* CountCache.java ,h^6y
* QIkFX.^
* Created on 2007年1月1日, 下午5:01 vX }iA|`#
* ^`yhN
* To change this template, choose Tools | Options and locate the template under bW
W!,-|R
* the Source Creation and Management node. Right-click the template and choose LOkgeJuWv
* Open. You can then make changes to the template in the Source Editor. }SSg>.48w
*/ ~},H+A!?
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package com.tot.count; R9A:"sJ
import java.util.*; 2@a'n@-
/** pA .orx
* T/|!^qLF
* @author !hQ-i3?qm
*/ GhfhR^P
public class CountCache { e W8cI)wU
public static LinkedList list=new LinkedList(); lD$s, hp
/** Creates a new instance of CountCache */ k$%{w\?Jf
public CountCache() {} VDnrm*
public static void add(CountBean cb){ j4i$2ZT'
if(cb!=null){ 8
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list.add(cb); [6VM4l"
} 6E) T;R(@
} *x8~}/[T(F
} TYuP
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CountControl.java qY-aR;
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/* -J63'bb7oi
* CountThread.java 15 {^waR6
* (Yj6|`
* Created on 2007年1月1日, 下午4:57 w-WAgAch
* \)28,`
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose yam'LF
* Open. You can then make changes to the template in the Source Editor. Qf0P"s`
*/ w31O~Ve
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package com.tot.count; =Jl\^u%H(x
import tot.db.DBUtils; 8i"CU:(
import java.sql.*; A&1EOQ=N
/** eJqx,W5MK]
* yzfiH4
* @author %u%;L+0Q[
*/ ypM,i
public class CountControl{ 6T4"m
private static long lastExecuteTime=0;//上次更新时间 'dwsm7Xd
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 5L6.7}B
/** Creates a new instance of CountThread */ $!G|+OuTR
public CountControl() {} umPnw
public synchronized void executeUpdate(){ !"phz&E5ah
Connection conn=null; 4Ty?>'*|
PreparedStatement ps=null; ^e "4@O"
try{ ,eebO~7vB
conn = DBUtils.getConnection(); \|X
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conn.setAutoCommit(false); ;,Vdj[W$>
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); _RcEfT
for(int i=0;i<CountCache.list.size();i++){ Qq{tX
CountBean cb=(CountBean)CountCache.list.getFirst(); wa[J\lW
CountCache.list.removeFirst(); N/-(~r[
ps.setInt(1, cb.getCountId()); CPa+?__B
ps.executeUpdate();⑴ gm]q<~eMW
//ps.addBatch();⑵ ~jKIuO/
} TH4f"h+B3"
//int [] counts = ps.executeBatch();⑶ t#M[w|5?
conn.commit(); ShRMzU
}catch(Exception e){ OtL~NTY
e.printStackTrace(); 7y&