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: pt,L
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CountBean.java p'1/J:EnV
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/* QuPz'Ut#
* CountData.java %Uz\P|6PO
* jy?*` q1]
* Created on 2007年1月1日, 下午4:44 }^ ,D~b-nB
* r]Wt! oHm5
* To change this template, choose Tools | Options and locate the template under #S'uqP!
* the Source Creation and Management node. Right-click the template and choose 4n7Kz_!SVf
* Open. You can then make changes to the template in the Source Editor. L-C^7[48=
*/ s(3HZ>qx;
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package com.tot.count; h\w;SDwOk
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/** >19s:+
* UGy3B)
* @author ,.>9$( s
*/ WcNQF!f
public class CountBean { 3WGE T[3
private String countType; :VZS7$5
int countId; [Tp?u8$p`
/** Creates a new instance of CountData */ Af]zv~uM
public CountBean() {} 8TT#b?d
public void setCountType(String countTypes){ YYYF a
this.countType=countTypes; v#%rjml[
} hQm=9gS
public void setCountId(int countIds){ zdrP56rzZ
this.countId=countIds; f/UU{vX(
} s)r!3HS
public String getCountType(){ K {v^Y,B
return countType; /-[vC$B"
} A'z]?xQR
public int getCountId(){ >B**fZ~L
return countId; Uq#2~0n>
} 3Z9Yzv)A
} ]A%3\)r
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CountCache.java \#:
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/* <$z[pw<
* CountCache.java p;}`PW
* 6LCtWX
* Created on 2007年1月1日, 下午5:01 Eb[;nk?
* P ljPhAce
* To change this template, choose Tools | Options and locate the template under pJ/]\>#5
* the Source Creation and Management node. Right-click the template and choose O~V^]
* Open. You can then make changes to the template in the Source Editor. KMIe%2:b5
*/ Dnw^H.
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package com.tot.count; @iuX~QA[9
import java.util.*; -#f.}H'
/** T"vf
* cmXbkM
* @author #wIWh^^ Zy
*/ 3 k/E$wOj
public class CountCache { z)C/U
public static LinkedList list=new LinkedList(); yor'"6)i
/** Creates a new instance of CountCache */ SzMh
public CountCache() {} 5`p9Xo>)yW
public static void add(CountBean cb){ j_so s%-
if(cb!=null){ N~$>| gn
list.add(cb); L'{W|Xb+
} ny13+Q`^
} X|{T ljn
}
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CountControl.java &B(z**+9
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/* S~aWun
* CountThread.java B3ItZojAuw
* /";tkad^
* Created on 2007年1月1日, 下午4:57 e1W9"&4>G{
* 6a,8t
* To change this template, choose Tools | Options and locate the template under :%sBY0 yF
* the Source Creation and Management node. Right-click the template and choose uluAqDz`
* Open. You can then make changes to the template in the Source Editor. @)h>vg
*/ $4g{4-)
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package com.tot.count; x[{\Aw>$.
import tot.db.DBUtils; O`y3H lc
import java.sql.*; _:9}RT?
/** v>`Fo[c
* *MmH{!=
* @author nUj`#%
*/ Ds(Z.
public class CountControl{ Cik1~5iF
private static long lastExecuteTime=0;//上次更新时间 (/I6Wa
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &qg6^&
/** Creates a new instance of CountThread */ rgIWM"
public CountControl() {} i5TGK#3o
public synchronized void executeUpdate(){ rB".!b
Connection conn=null; GxzO|vFQ
PreparedStatement ps=null; 2om:S+3)2
try{
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conn = DBUtils.getConnection(); C1NU6iV^z
conn.setAutoCommit(false); fr(Ja;
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); l[i4\ CT
for(int i=0;i<CountCache.list.size();i++){ ljK?2z>
CountBean cb=(CountBean)CountCache.list.getFirst(); :-jbIpj'
CountCache.list.removeFirst(); `l]Lvk8O
ps.setInt(1, cb.getCountId()); W<)nC_$
ps.executeUpdate();⑴ L~PiDQr?r
//ps.addBatch();⑵ _0$>LWO~
} ~v(c9I)
//int [] counts = ps.executeBatch();⑶ k9*UBx
conn.commit();
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}catch(Exception e){ s@:Yu
e.printStackTrace(); EpF9&