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: b ?2X>QJ
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CountBean.java 3dxnh,]&@
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/* F'UguC">
* CountData.java Dmm r]~
* ,+NE: _
* Created on 2007年1月1日, 下午4:44 tgvpf/cQ
* & GzhcW~
* To change this template, choose Tools | Options and locate the template under @RoRNat
* the Source Creation and Management node. Right-click the template and choose 0(hv #C4
* Open. You can then make changes to the template in the Source Editor. L VU)W^
*/ Ql:
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package com.tot.count; "x.6W!
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/** K?FX<PT
* [aWDD[#j~
* @author 5&-j{J0iV
*/ l)i&ATvCE
public class CountBean { Q/3tg
private String countType; ){Ciu[h
int countId; p(H)WD
/** Creates a new instance of CountData */ "BLv4s|y7L
public CountBean() {} ||'i\X|[
public void setCountType(String countTypes){ u1pc5 Y{
this.countType=countTypes; \=EY@*=
} [DotS\p!z
public void setCountId(int countIds){ Rg8m4x w
this.countId=countIds; s}[A4`EWH
} 38w.sceaT
public String getCountType(){ C)J_lI{^
return countType; (?!(0Ywbg
} qlz9&w
public int getCountId(){ /jjW/lr
return countId; Ere?d~8
} ]{Mci]H6T
} <uBhi4
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CountCache.java G. -h=DT]
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/* GCP{Z]u
* CountCache.java [xZ/ZWb/
* SG
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* Created on 2007年1月1日, 下午5:01 y~==waZw
* xs2,t*
* To change this template, choose Tools | Options and locate the template under j[m_qohd7
* the Source Creation and Management node. Right-click the template and choose IDGQIg
* Open. You can then make changes to the template in the Source Editor. {z5V{M(|w3
*/ vgh^fa!/
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package com.tot.count; gqP-E
import java.util.*;
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/** QD.zU/F~>
* Xq8uY/j
* @author "<PoJPh
*/ [):{5hMA
public class CountCache { 6?1s`{yy
public static LinkedList list=new LinkedList(); l)tTg+:
/** Creates a new instance of CountCache */ 9*}iBs
public CountCache() {} _DPB?)!x
public static void add(CountBean cb){ e5qrQwU
if(cb!=null){ ill-%OPeg
list.add(cb); {h/OnBwG
} S3ab0JM
} !G)mjvEe
} /~o7Q$)-b
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CountControl.java 5u2{n rc
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/* 1A7 %0/K-]
* CountThread.java lv<iJH\
* ]dPVtk
* Created on 2007年1月1日, 下午4:57 0t#NMW
* ^%\)Xi
* To change this template, choose Tools | Options and locate the template under F[>7z3I
* the Source Creation and Management node. Right-click the template and choose '}U_D:o.b
* Open. You can then make changes to the template in the Source Editor. Zdv.PGn
*/ u-AWJc+F .
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package com.tot.count; @k=cN>ZMc
import tot.db.DBUtils; D+@-XU<Lp<
import java.sql.*; 5kGxhD
/** W4)kkJ
*
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* @author $q Zc!Qc
*/ ^=eq .(>
public class CountControl{ ! (2-(LgA
private static long lastExecuteTime=0;//上次更新时间 9
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 !MZ+- dpK
/** Creates a new instance of CountThread */ E
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public CountControl() {} pyUNRqp
public synchronized void executeUpdate(){ iBG`43;
Connection conn=null; eq^TA1>T
PreparedStatement ps=null; vS7/ ~:C
try{ nkCecwzr-
conn = DBUtils.getConnection(); *ZGX-+{
conn.setAutoCommit(false); IZv~[vi_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 8|1`Tn}o
for(int i=0;i<CountCache.list.size();i++){ 5;X {.2
CountBean cb=(CountBean)CountCache.list.getFirst(); c u\ls^
CountCache.list.removeFirst(); Cw
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ps.setInt(1, cb.getCountId()); 7m@
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ps.executeUpdate();⑴ Ihdu1]~R{
//ps.addBatch();⑵ Gs+\D0o!
} ANckv|&'v
//int [] counts = ps.executeBatch();⑶ 4rI:1yGt@
conn.commit(); 54<6Dy f
}catch(Exception e){ Dc5bkm
e.printStackTrace(); M,crz
} finally{ ao)Ck3]
try{
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if(ps!=null) { K1:a]aU?Iu
ps.clearParameters(); :ar?0
ps.close(); ;KZrl`
ps=null; HbNYP/MN3
} 1s Br.+p
}catch(SQLException e){} D+f'*|
DBUtils.closeConnection(conn); "kX`FaAhY
} G7
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} sa_R$ /H
public long getLast(){ u FMIY(vB
return lastExecuteTime; DC&A1I&
} /@Ez" ?V2
public void run(){ >Z *iE"9"
long now = System.currentTimeMillis(); b& V`<'{
if ((now - lastExecuteTime) > executeSep) { >B0D/:R9
//System.out.print("lastExecuteTime:"+lastExecuteTime); |Dg;(i?
//System.out.print(" now:"+now+"\n"); {T&v2u#S
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Y5HfN[u^7
lastExecuteTime=now; WElrk:b
executeUpdate(); jRofG'
} R4V \B
else{ 0Qm"n6NQ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); WNhbXyp_
} H6_xwuw:
} ^Z2kq2}a
} , 7Xqte
//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 *9J1$Wa
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类写好了,下面是在JSP中如下调用。 \yM-O- {
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<%
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CountBean cb=new CountBean(); l<TIG3bs
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); K'NcTw#f
CountCache.add(cb); aM), M]m[
out.print(CountCache.list.size()+"<br>"); VMx%1^/(
CountControl c=new CountControl(); NH'iR!iGo
c.run(); mG_BM/$
out.print(CountCache.list.size()+"<br>"); <{giHT
%>