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: 0?w4
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CountBean.java Q`HG_n@?
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/* 91oAg[@4G
* CountData.java ,R*YI
* &`B
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* Created on 2007年1月1日, 下午4:44 mQ=nU
* S]<%^W'
* To change this template, choose Tools | Options and locate the template under jc7NYoT:
* the Source Creation and Management node. Right-click the template and choose l0BYv&tu
* Open. You can then make changes to the template in the Source Editor. rodr@
*/ 4<A+Tf
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package com.tot.count; ia*Bcx_RW+
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/** &\5%C\0Z<
* A)HV#T`N
* @author ;@/vKA3l.
*/ iu+rg(*%
public class CountBean { D8=a +!l-
private String countType; 8C4v
int countId; m%.7l8vT
/** Creates a new instance of CountData */ zuYz"-(L
public CountBean() {} x}7` Q:k=
public void setCountType(String countTypes){ X+'B*K$
this.countType=countTypes; %&&;06GU}
} MuP&m{
public void setCountId(int countIds){ ]-8yZWal
this.countId=countIds; _8s1Wh G
} $@eFSA5k,7
public String getCountType(){ ^2eH0O!
return countType; G0Wv=tX|
} K&;;{~md.
public int getCountId(){ ]GmXZi
return countId; HyJ&;4rf
} T?EFY}f
} - %`iLu
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CountCache.java 8+8P{_
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/* Qe4"a*l-r
* CountCache.java "a]Ff&T-
* f1RX`rXf
* Created on 2007年1月1日, 下午5:01 JAS!eF
* ;2Za]%'
* To change this template, choose Tools | Options and locate the template under /u pDbP.O
* the Source Creation and Management node. Right-click the template and choose h%!N!\
* Open. You can then make changes to the template in the Source Editor. &DX
*/ 95^-ptO{1`
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package com.tot.count; #2Z\K>L
import java.util.*; (6~~e$j
/** $|H7fn(r
* L<O"36R
* @author $?dutbE
*/ KO&oT#S
public class CountCache { {PQ!o^7y
public static LinkedList list=new LinkedList(); Sj9NhtF]f
/** Creates a new instance of CountCache */ M|\C@,F]8
public CountCache() {} |s{[<;
public static void add(CountBean cb){ _?~)B\@~0
if(cb!=null){ >o8N@`@VK-
list.add(cb); FW,@.CX
} t.6gyrV7><
} N-<m/RS
} +I_p\/J?w/
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CountControl.java 8L,i}hIo.
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/* 9/4Bx!~A
* CountThread.java
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* Cl'3I%$8K
* Created on 2007年1月1日, 下午4:57 cP&XkAQ
* {,
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* To change this template, choose Tools | Options and locate the template under :Wmio\
* the Source Creation and Management node. Right-click the template and choose [B" CNnA
* Open. You can then make changes to the template in the Source Editor. WoX,F1 o
*/ a!*K)x,"<
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package com.tot.count; ~4C:2
import tot.db.DBUtils; bT#re
import java.sql.*; vGI?X#w3
/**
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* 1,(uRS#bk
* @author _do(
*/ DgRA\[c
public class CountControl{ G8Sx;Xi
private static long lastExecuteTime=0;//上次更新时间 h0n,WU/Kw
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 X7{ h/^
/** Creates a new instance of CountThread */ X)k+BJ
public CountControl() {} E|5lm
public synchronized void executeUpdate(){ drEND`,@6|
Connection conn=null; Yn1CU
PreparedStatement ps=null; t9+ME|
try{ V.12
conn = DBUtils.getConnection(); _)F0oC {
conn.setAutoCommit(false); 4&/m>%r
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); nk-V{']
for(int i=0;i<CountCache.list.size();i++){ @T8$/
CountBean cb=(CountBean)CountCache.list.getFirst(); J<=k
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CountCache.list.removeFirst(); N77EM
ps.setInt(1, cb.getCountId()); $][$ e
ps.executeUpdate();⑴ QP0[
//ps.addBatch();⑵ n
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} {ZrB,yK
//int [] counts = ps.executeBatch();⑶ n>
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conn.commit(); t}2$no?
}catch(Exception e){ fY{&W@#g
e.printStackTrace(); 'k9dN
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} finally{ (b4;c=<[{
try{ @gHWU>k,A
if(ps!=null) { z8\;XR
ps.clearParameters(); Ss
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ps.close(); U2)y fhI
ps=null; >Pw
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} \`$RY')9|!
}catch(SQLException e){} sCw X|
DBUtils.closeConnection(conn); EABy<i
}
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} 3^J~ts{*
public long getLast(){ X'KkIo
:
return lastExecuteTime; 9;k!dM
} XVNJ3/
public void run(){ GO=3<Q{;
long now = System.currentTimeMillis(); )OgQ&,#
if ((now - lastExecuteTime) > executeSep) { D?<R5zp
//System.out.print("lastExecuteTime:"+lastExecuteTime); 6m!%X GZT
//System.out.print(" now:"+now+"\n"); i%a jL
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ] f~mR_E
lastExecuteTime=now; qD?-&>dBWi
executeUpdate(); =Zc
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} QwL'5ws{q
else{ sU}.2k
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =(U&?1 R4
} c<J/I_!
} WG?;Z
} soi.`xE
//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 r7=r~3)
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类写好了,下面是在JSP中如下调用。 ZQQ0}
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<% e-.s63hm
CountBean cb=new CountBean(); "G,$Sqi@
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); }xE}I<M
CountCache.add(cb); =9@t6
out.print(CountCache.list.size()+"<br>"); 7)y9%-}
CountControl c=new CountControl(); D%=FCmL5@=
c.run(); 5gnmRd
out.print(CountCache.list.size()+"<br>"); ;zc,vs
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