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: 7t7"glP
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CountBean.java GsG.9nd
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/* 79|=y7i#
* CountData.java :c@v_J6C&
* \jDD=ew
* Created on 2007年1月1日, 下午4:44 ufE;rcYE
* >NWrT^rk
* To change this template, choose Tools | Options and locate the template under A*jU&3#
* the Source Creation and Management node. Right-click the template and choose M=$
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* Open. You can then make changes to the template in the Source Editor. zdFO&YHTw
*/ ?El8:zt? |
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package com.tot.count; ?IR]y-r
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/** @:\Iw"P
* U|QLc
* @author 4.:2!Q
*/ &<}vs`W
public class CountBean { F+mn d,3
private String countType; hI.@!$~=
int countId; kLa9'c0
/** Creates a new instance of CountData */ e^)+bmh
public CountBean() {} N t]YhO
public void setCountType(String countTypes){ 8yEN)RqI
this.countType=countTypes; W($}G_j[B1
} 4RCD<7
public void setCountId(int countIds){ SJb+:L>
this.countId=countIds; (- `h8M
} h/E+r:2]
public String getCountType(){ 2Fk4jHj
return countType; EkotVzR5
} !sWKi)1
public int getCountId(){ m2 0:{fld
return countId; U.]5UP:a
} JDcc`&`M
} xE.K
NUBf>~_}
CountCache.java -j1?lY
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/* \$GM4:R D
* CountCache.java mw2/jA7
* !n9H[QP^9
* Created on 2007年1月1日, 下午5:01 04ZP\
* #-5.G>8
* To change this template, choose Tools | Options and locate the template under \ng!qN
* the Source Creation and Management node. Right-click the template and choose `}t<5_
* Open. You can then make changes to the template in the Source Editor. qxKW%{6o
*/ {j$ :9 H
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package com.tot.count; YJdM6
import java.util.*; 72uARF
/** \)KLm
* RCM;k;@8V
* @author 'sb&xj`d
*/ O# n<`;W
public class CountCache { !C13E lf
public static LinkedList list=new LinkedList(); cP#vzFB0>
/** Creates a new instance of CountCache */ >&pB&'A a
public CountCache() {} }8
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public static void add(CountBean cb){ SU>2MT^
if(cb!=null){ /4Ud6gscf
list.add(cb); *AK{GfP_
} ]fxYSm
} !1G6ZC:z
} KrVP#|9%"
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CountControl.java \ZNUt$\
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/* zt&"K0X|
* CountThread.java yN-o?[o
* X5[.X()M4
* Created on 2007年1月1日, 下午4:57 v\&C]W]
* %?<Y&t
* To change this template, choose Tools | Options and locate the template under D,R"P }G
* the Source Creation and Management node. Right-click the template and choose >3aB{[[N
* Open. You can then make changes to the template in the Source Editor. imb.CYS74
*/ B^|^hZZ>
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package com.tot.count; K
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import tot.db.DBUtils; ckDWY<@v
import java.sql.*; t`F<lOKj
/** >|j8j:S[
* i|N%dl+T=
* @author Sq<ds}o'8l
*/ w3hG\2)[HS
public class CountControl{ dgbqMu"
private static long lastExecuteTime=0;//上次更新时间 -hy`Np
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %=w@c
/** Creates a new instance of CountThread */ 9NXL8QmC8
public CountControl() {} :8(
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public synchronized void executeUpdate(){ `^d [$IbDW
Connection conn=null; J}zN]|bz
PreparedStatement ps=null; \S5YS2,P
try{ W20qn>{z
conn = DBUtils.getConnection(); Qqm$Jl!
conn.setAutoCommit(false); KOv?p@d
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); @wVq%GG}
for(int i=0;i<CountCache.list.size();i++){ P5?M"j0/^
CountBean cb=(CountBean)CountCache.list.getFirst(); B}?$kp
CountCache.list.removeFirst(); 6h5DvSO
ps.setInt(1, cb.getCountId()); 5vP=Wf cW
ps.executeUpdate();⑴ d ,"L8
//ps.addBatch();⑵ F7!q18ew
} fx74h{3u
//int [] counts = ps.executeBatch();⑶ c]Z@L~WW
conn.commit(); 4Su|aWL-
}catch(Exception e){ 2)-V\:;js
e.printStackTrace(); V1l9T_;f
} finally{ K>a@AXC
try{ bM@8[&ta
if(ps!=null) { g$?kL
ps.clearParameters(); wC&+nS1
ps.close(); v%
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ps=null; xZE%Gf_U
} $!LL
}catch(SQLException e){} Uo]x6j<
DBUtils.closeConnection(conn);
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} 5w9oMM{
} PI-o)U$Ehv
public long getLast(){ T[(4z@d`5
return lastExecuteTime; :qAF}|6
} BN]{o(EB
public void run(){ 9coN >y
long now = System.currentTimeMillis(); }57d3s
if ((now - lastExecuteTime) > executeSep) { bVgmjt2&>
//System.out.print("lastExecuteTime:"+lastExecuteTime); QKP@+E_U
//System.out.print(" now:"+now+"\n"); &YpWfY&V