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: xC N6?
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CountBean.java kFKc9}7W
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/* s~e<Pr?yu
* CountData.java 4=/5
* hRAI7xk
* Created on 2007年1月1日, 下午4:44 7P1G^)
* a&:1W83
* To change this template, choose Tools | Options and locate the template under ;pe1tp
* the Source Creation and Management node. Right-click the template and choose H$'|hUwds%
* Open. You can then make changes to the template in the Source Editor. U\aP
*/ =k.:XblEe[
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package com.tot.count; ,fWQSc\}
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/** <0lXJqd
* aAM!;3j]B`
* @author F6>K FU8
*/ :5)Dn87
public class CountBean { vHR-mQUs
private String countType; VB>KT(n-b
int countId; l
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/** Creates a new instance of CountData */ S&/</%
public CountBean() {} 3#GZ6:rVJ
public void setCountType(String countTypes){ aD)$aK
this.countType=countTypes; !ieMhJ5r
} oh*Hzb
public void setCountId(int countIds){ n>Cl;cN=
this.countId=countIds; +c)"p4m
} `=m[(CLb
public String getCountType(){ u#(&
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return countType; &gF*p
} G!]%xFwYa
public int getCountId(){ ,RmXZnWY
return countId; h>Z NPP8N
} Oi#4|*b{W
} ]vj.s/F~
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CountCache.java nW)-bAV<
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/*
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* CountCache.java .CJQ]ECl7p
* s|er+-'
* Created on 2007年1月1日, 下午5:01 qHwHP 1
* 'ec G:B`S
* To change this template, choose Tools | Options and locate the template under (!b_o A8V
* the Source Creation and Management node. Right-click the template and choose UI:YzR
* Open. You can then make changes to the template in the Source Editor. %v}SJEXFp
*/ 0e./yPTT
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package com.tot.count; 2MT_5j5[N
import java.util.*; lT.Q)(
/** x"g-okLN
* BdWRm=
* @author ~nit~;
*/ `As|MYv
public class CountCache { &[u>^VO8
public static LinkedList list=new LinkedList(); :LE0_ .
/** Creates a new instance of CountCache */ 0cYd6u@
public CountCache() {} s*'L^>iZ
public static void add(CountBean cb){ W&M=%
if(cb!=null){ N$'/J-^
list.add(cb); 2!-?
} Q1ox<-
} 7RXTQ9BS
} 1Yr&E_5/
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CountControl.java b5!\"v4c
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/* |E{tS,{OhJ
* CountThread.java ]JGh[B1gh
* D.7,xgH
* Created on 2007年1月1日, 下午4:57 K)-Gv|*t
* OGl>i
* To change this template, choose Tools | Options and locate the template under M't~/&D#
* the Source Creation and Management node. Right-click the template and choose |X}H&wBWo
* Open. You can then make changes to the template in the Source Editor. j[E8C$lW
*/ :+ASZE.
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package com.tot.count; 7CKpt.Sz6
import tot.db.DBUtils; cZ8lRVaWW
import java.sql.*; |\HYq`!g%7
/** ]lBe
* `2WtA_
* @author VV_Zrje
*/ ?(C(9vO
public class CountControl{ U,G!u =+
private static long lastExecuteTime=0;//上次更新时间 uj8G6'm%
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Kmk}Yz
/** Creates a new instance of CountThread */ Z`_`^ \"
public CountControl() {} Fe: M'.
public synchronized void executeUpdate(){ Cx
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Connection conn=null; 2/*F}w/
PreparedStatement ps=null; #9R[%R7Nz
try{ !@6P>HzY$
conn = DBUtils.getConnection(); o0yyP,?yh
conn.setAutoCommit(false); v~l_6V}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7z.(pg=
for(int i=0;i<CountCache.list.size();i++){ O~p@87aq
CountBean cb=(CountBean)CountCache.list.getFirst(); Z.Otci> J
CountCache.list.removeFirst(); {c
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ps.setInt(1, cb.getCountId()); ,]:vk|a#;
ps.executeUpdate();⑴ "7w~0?}
//ps.addBatch();⑵ .,-,@ZK
} ;q=0NtCS=4
//int [] counts = ps.executeBatch();⑶ ^[UWG^d
conn.commit(); g]fds Zv
}catch(Exception e){ "ITC P<+
e.printStackTrace(); m7dpr$J
} finally{ `5HFRgL`.
try{ +2DzX/3
if(ps!=null) { ^Vbx9UN/
ps.clearParameters(); !b !C+ \v
ps.close(); |iGfX,C|
ps=null; xgdS]Sz
} i146@<\G{P
}catch(SQLException e){} L9lN AiOH
DBUtils.closeConnection(conn); qVHXZdGL
} )+Nm@+B
} }Q }&3m~g
public long getLast(){ 0XkLWl|k
return lastExecuteTime; S]Y3nI
} asT/hsSNS
public void run(){ J
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long now = System.currentTimeMillis(); zRO-oOJ
if ((now - lastExecuteTime) > executeSep) { \(4"kY_=
//System.out.print("lastExecuteTime:"+lastExecuteTime); `.MY"g9
//System.out.print(" now:"+now+"\n"); ] "ZL<?3g
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); .o27uB.
lastExecuteTime=now; SxX2+|0g`g
executeUpdate(); S.: m$s
} U@;W^Mt
else{ /.knZ_aJ!
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 6%jv|\>
} JYAtQTOR
} v?s]up @@h
} >A]U.C
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释
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类写好了,下面是在JSP中如下调用。 xSf&*wLE
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<% I.4o9Z[?
CountBean cb=new CountBean(); X@["Jjp
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); pBZf=!+E
CountCache.add(cb); +t9$*i9`L
out.print(CountCache.list.size()+"<br>"); ^|b ]E
CountControl c=new CountControl(); x4_xl
.
c.run(); %OV)O -
out.print(CountCache.list.size()+"<br>"); tom1u>1n
%>