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: MTJ ."e<B
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CountBean.java !]AM#LJ
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/* }= OI (Wy
* CountData.java c"`o V! m
* Y"~Tf{8
* Created on 2007年1月1日, 下午4:44 j9"uxw@
* e0iE6:i
* 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 R~OameRR
* Open. You can then make changes to the template in the Source Editor. {(;dHF%{
*/ mLApF5Hy
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package com.tot.count; j\l9|vpp
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/** `x%v&>
* K=,nX7Z5
* @author 'z$ BgXh\
*/ u[nx?!
public class CountBean { xCU^4DO3p
private String countType; q =sEtH=
int countId; ":s1}A
/** Creates a new instance of CountData */ al>^}:
public CountBean() {} RsV<4$
public void setCountType(String countTypes){ A9Cq(L_H
this.countType=countTypes; rg Gm[SL*<
} m(MPVY<X
public void setCountId(int countIds){ ?sfas57&y
this.countId=countIds; `o~dQb/k+
} iSDE6
public String getCountType(){ | R MIV
return countType; Py2AnpYa
} 7|4t;F!
public int getCountId(){ ]7<}EG
return countId; e8T#ZWr*
}
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} >YP6/w,e
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CountCache.java V1y"
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/* ffMh2
* CountCache.java v4M1uJ8
* O ?`=<W/R
* Created on 2007年1月1日, 下午5:01 l2&cwjc
* nx{_^sK
* To change this template, choose Tools | Options and locate the template under _$s ;QI]x
* the Source Creation and Management node. Right-click the template and choose *12,MO>go
* Open. You can then make changes to the template in the Source Editor. -|E|-'
*/ R^8L^8EL
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package com.tot.count; lmmB =F
import java.util.*; >6fc`3*!
/** }:JE*D|
* \XDc{c]
* @author Axb,{X[6g
*/ R9=K/
public class CountCache { 0\fV'JDOR
public static LinkedList list=new LinkedList(); :[icd2JCw]
/** Creates a new instance of CountCache */ ,w>WuRN"
public CountCache() {} mqw5\7s ?
public static void add(CountBean cb){ hf5yTs
if(cb!=null){ 80qSPitj
list.add(cb); fL^+Qb}
} >q W_%
} c6 O1Z\M@\
} kmfz=q?
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CountControl.java <{$0mUn;s|
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/* 1Z9_sd~/6
* CountThread.java \#1*r'V8
* ]/byz_7]
* Created on 2007年1月1日, 下午4:57 >`\f,yql6
* ahezDDR-.i
* To change this template, choose Tools | Options and locate the template under 21(8/F ~{
* the Source Creation and Management node. Right-click the template and choose hC1CISm.U
* Open. You can then make changes to the template in the Source Editor. zJ-_{GiM*L
*/ }M3f ?Jv
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package com.tot.count; <*D{uMw
import tot.db.DBUtils; ,&+"|,m
import java.sql.*; Gyo[C98
/** 66A}5b4)]
* _<;;CI3w
* @author eN*=wOh
*/ NBLiwL37{
public class CountControl{ 8:W,""
private static long lastExecuteTime=0;//上次更新时间 ;ZnSWIF2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ;Y/{q B!
/** Creates a new instance of CountThread */ um/2.Sn>
public CountControl() {} $U3|.4
public synchronized void executeUpdate(){ E0F8FR'
Connection conn=null; P''5A6#5
PreparedStatement ps=null; :.;pRz
try{ 4<`Qyul-
conn = DBUtils.getConnection(); t(<^of:
conn.setAutoCommit(false); K})=&<M0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); )SkJgzvC
for(int i=0;i<CountCache.list.size();i++){ bCv=Uo,+6
CountBean cb=(CountBean)CountCache.list.getFirst(); DV={bcQ
CountCache.list.removeFirst(); U`{'-L.
ps.setInt(1, cb.getCountId()); "Jd!TLt\x
ps.executeUpdate();⑴ P'EPP*)q
//ps.addBatch();⑵ n^} -k'l
} {_#~&I