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: !+{$dB>a
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CountBean.java pUm|e5
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/* f6U
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* CountData.java |N+uEiJ
* 4Tn97G7
* Created on 2007年1月1日, 下午4:44 Cw,;>>Y_b<
* Ojs^-R_
* To change this template, choose Tools | Options and locate the template under mgI 7zJX
* the Source Creation and Management node. Right-click the template and choose |L%d^m
* Open. You can then make changes to the template in the Source Editor.
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*/ Mx_O'D
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package com.tot.count;
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/** 0;n}{26a
* ]>H'CM4JR
* @author x/,(G~
*/ XyrQJ}WR|
public class CountBean { `71(wf1q[f
private String countType; ~X<Ie9m1x
int countId; GQ])y
/** Creates a new instance of CountData */ fiZq C?(
public CountBean() {} Rt3/dw(p
public void setCountType(String countTypes){ hVf;{p
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this.countType=countTypes; "|6763.{4
} {"n=t`E)3
public void setCountId(int countIds){ E.%_i8s
this.countId=countIds; o@W:PmKW
} q&d5V~q
public String getCountType(){ 3}gf%U]L
return countType; \Rz-*zr&
} ql2O%B.6?
public int getCountId(){ &p_V<\(%
return countId; #-9@*FFL,
} ![3l
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} fYUbr"Oe
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CountCache.java B0dv_'L}L
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/* +p):
* CountCache.java M~LYq
* ix!4s613w
* Created on 2007年1月1日, 下午5:01 cd:VFjT
* qfa[KD)!aB
* To change this template, choose Tools | Options and locate the template under eiwPp9[08
* the Source Creation and Management node. Right-click the template and choose &09g0K66
* Open. You can then make changes to the template in the Source Editor. WeE1 \
*/
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package com.tot.count; SnFAv7_
import java.util.*; N={0A
/** _&}z+(Ug
* *7G5\[gI$
* @author 5~\GAjf
*/ \Ws$@J-M
public class CountCache { sQgJ`+Y8_
public static LinkedList list=new LinkedList(); 4$MV]ldUI
/** Creates a new instance of CountCache */ t# <(Q
public CountCache() {} !B:wzb_
public static void add(CountBean cb){ c'&\[b(m
if(cb!=null){ %hV]vm
list.add(cb); TT3\c,cs
} x}X
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} b2G1@f.U
} *@zya9y9q
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CountControl.java $.T\dm-
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/* ve@E.`
* CountThread.java F%`O$uXA
* z-G*:DfgH
* Created on 2007年1月1日, 下午4:57 /{FSG!
* 1}"Prx-
* 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 VGeyZ\vU
* Open. You can then make changes to the template in the Source Editor. 8 GW0w
*/ *(CV OY~
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package com.tot.count; 2b^E8+r9
import tot.db.DBUtils; prO ~g
import java.sql.*; E4qQ
/** [VY265)g
* yLEAbd%+
* @author -AZ\u\xCB
*/ <(W:Q3?s
public class CountControl{ (%SKTM
private static long lastExecuteTime=0;//上次更新时间 c%5Suu(J6
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Gc2:^FVlh
/** Creates a new instance of CountThread */ C1po]Ott*
public CountControl() {} `=19iAp.
public synchronized void executeUpdate(){ OXD*ZKi8
Connection conn=null; ?eOw8Rom
PreparedStatement ps=null; J{e`P;ND
try{ }Wz[ox 9b
conn = DBUtils.getConnection(); 8&c:73=?X
conn.setAutoCommit(false); eoxEnCU
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); JV@b(x`
for(int i=0;i<CountCache.list.size();i++){ (R-(
CountBean cb=(CountBean)CountCache.list.getFirst(); (Ky$(Ubb#6
CountCache.list.removeFirst(); |)+45e
ps.setInt(1, cb.getCountId()); -I.BQ
ps.executeUpdate();⑴ ewVks>lbz
//ps.addBatch();⑵ k293wS
} (Z?g^kjq)
//int [] counts = ps.executeBatch();⑶ tqzr+
conn.commit(); g-DFcwO,V
}catch(Exception e){ w<Ot0&