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: tHHJ|4C
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CountBean.java ('U TjV
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/* <\O8D0.d
* CountData.java $eG_LY 1v
* _X mxBtk9f
* Created on 2007年1月1日, 下午4:44 EhM=wfGKw
* bgKC^Q/F
* To change this template, choose Tools | Options and locate the template under FI.F6d)E$
* the Source Creation and Management node. Right-click the template and choose -!\%##r7~
* Open. You can then make changes to the template in the Source Editor. P=KhR&gwV~
*/ x<Gjr}
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package com.tot.count; m-ibS:
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/** Ry"4v_e9
* #+V4<o
* @author a:`<=^:4,
*/ a$Y{ut0t(
public class CountBean { T*PEUq
private String countType; T!B\ixt6
int countId; kWVk^,
/** Creates a new instance of CountData */ EU%v
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public CountBean() {} cz/cY:o)
public void setCountType(String countTypes){ lS7L|
this.countType=countTypes; cNxxX!P/
} sxph#E%
public void setCountId(int countIds){ bv'>4a
this.countId=countIds; la w$LL
} 6$=>ck P
public String getCountType(){ Z`MpH
return countType; (=;'>*L(
}
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public int getCountId(){ =b>TF B=*N
return countId; |N%
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} k{{3nenAG
} KV|D]}
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}
CountCache.java 6w;`A9G[YI
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/* V|kN 1
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* CountCache.java /.CS6W^z
* %=9o'Y,4
* Created on 2007年1月1日, 下午5:01 Z|Rc54Ct
* @KU;'th
* To change this template, choose Tools | Options and locate the template under 1zH?.-
* the Source Creation and Management node. Right-click the template and choose 'N+;{8C-{
* Open. You can then make changes to the template in the Source Editor. g3&nxZ
*/ :q*w_*w
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package com.tot.count; o5DT1>h
import java.util.*; ^>Z_3{s:$
/** 1/w8'Kf'u
* ]k^?=
* @author 2|& S2uq
*/ { +w.Z,D"
public class CountCache { w9VwZow
public static LinkedList list=new LinkedList(); .'_}:~
/** Creates a new instance of CountCache */ : slO0
public CountCache() {} 8a)Brl}u
public static void add(CountBean cb){ B=~y(Mb
if(cb!=null){ $w{d4" )
list.add(cb); .R"VLE|
} T)7U+~nQ"
} .Y]0gi8z
} UE"v+GH
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CountControl.java qve'Gm)
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/* K-#d1+P+
* CountThread.java /KF@Un_Ow
* BlU&=;#r5>
* Created on 2007年1月1日, 下午4:57 e1h7~ j
* O!f37n-TB
* To change this template, choose Tools | Options and locate the template under 4c 8{AZ
* the Source Creation and Management node. Right-click the template and choose l1'v`!
* Open. You can then make changes to the template in the Source Editor. k)*apc\W
*/ M.}J SDt
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package com.tot.count; ]bh%pn
import tot.db.DBUtils; JG'%HJ"D
import java.sql.*; i]?
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/** 5;" $X 1{
* v+ in:\Dv
* @author WA43}CyAe
*/ TmLCmy!
public class CountControl{ (1^;l;7H
private static long lastExecuteTime=0;//上次更新时间 6Yodx$
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ud5}jyJ
/** Creates a new instance of CountThread */ y-nv#Ejr
public CountControl() {} SF+L-R<e
public synchronized void executeUpdate(){ nCWoco.xy
Connection conn=null; [O&}Qk
PreparedStatement ps=null; 2p](`Y`
try{ 0m*b9+q
conn = DBUtils.getConnection(); p{LbTjdNc
conn.setAutoCommit(false); Q\kWQOB_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 6wWhM&Wd
for(int i=0;i<CountCache.list.size();i++){ YlbX_h2S"
CountBean cb=(CountBean)CountCache.list.getFirst(); >wmHCOL:
CountCache.list.removeFirst(); C 4C/
ps.setInt(1, cb.getCountId()); "q M
ps.executeUpdate();⑴ i56Rdb
//ps.addBatch();⑵ FsWp>}o
} ph6'(,
//int [] counts = ps.executeBatch();⑶ G6a 2]
conn.commit(); uuwJ-
}catch(Exception e){ c(
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e.printStackTrace(); !"qT2<A
} finally{ dLb$3!3
try{ _3 oo%?}
if(ps!=null) { VED~v#.c
ps.clearParameters(); T\.(e*hC
ps.close(); QCZ88\jX[
ps=null; iw/~t
}
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}catch(SQLException e){} TY %zw6 #p
DBUtils.closeConnection(conn); P}5bSQ( a3
} iv +a5
} g_c@Kyf
public long getLast(){ 77[TqRLf
return lastExecuteTime; ;k `51=Wi
} 9|<Li[
public void run(){ I1':&l^O
long now = System.currentTimeMillis(); 7\98E&
if ((now - lastExecuteTime) > executeSep) { }M% 3
//System.out.print("lastExecuteTime:"+lastExecuteTime); 0>SA90Q
//System.out.print(" now:"+now+"\n"); [>a3` 0M
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6#*_d,xQT
lastExecuteTime=now; Mi|13[p{
executeUpdate(); WFahb3kx
} yXDjM2oR/2
else{ *|W](id7e
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ZwsQ}5
} `9[n5-t
} a5t&{ajJ
} 8j70X <R
//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 o"BED!/
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类写好了,下面是在JSP中如下调用。 +&VY6(Zj+*
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<% H%Vf$1/TF
CountBean cb=new CountBean(); duEXp]f!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); J?m/u6
CountCache.add(cb); KMy"DVqE
out.print(CountCache.list.size()+"<br>"); ;-~E!_$
CountControl c=new CountControl(); ohKoX$|p~
c.run(); JYw?
out.print(CountCache.list.size()+"<br>"); _ncBq;j{
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