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: :=UeYm
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CountBean.java mY#[D;mUe
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/* jO<K0cc
* CountData.java BLuILE:$
* s1:UCv-%
* Created on 2007年1月1日, 下午4:44 !T6oD]x3
* a}0\kDe
* To change this template, choose Tools | Options and locate the template under u <D&RT
* the Source Creation and Management node. Right-click the template and choose WI](a8bm
* Open. You can then make changes to the template in the Source Editor. E3_EXz9h
*/ j?[fpN$
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package com.tot.count; FzA_-d/_dg
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/** (#X/sZQh
* X -w#E3
* @author 3Ki`W!C
*/ i1\xZ<|0
public class CountBean { P_,f
private String countType; ) ?+-Z2BwA
int countId; OT{qb!eYI
/** Creates a new instance of CountData */ .e"De-u
public CountBean() {} b4S7Q"g
public void setCountType(String countTypes){ `f8{^Rau
this.countType=countTypes; v3Te+oLg
} X./8
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public void setCountId(int countIds){ %7/XZQ
this.countId=countIds; -`&4>\o2Lx
} x44)o:
public String getCountType(){ %Kd8ZNv
return countType; ~EpMO]I
} ^['% wA%
public int getCountId(){ ofj7$se
return countId; g@`14U/|
} K3!|k(jt
} DUM,dFIlvF
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CountCache.java }i|o":-x+
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/* 2JUX29rER
* CountCache.java qs\
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* 3Ey#?
* Created on 2007年1月1日, 下午5:01 Bwn9ZYu#r
* K:465r:
* To change this template, choose Tools | Options and locate the template under )p(5$AR7
* the Source Creation and Management node. Right-click the template and choose \aU^c24>
* Open. You can then make changes to the template in the Source Editor. uy~5!i&
*/ @@'zMV%
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package com.tot.count; =_D82`p
import java.util.*; !|}J{
/** 9Rb-QI
* !M)!
* @author iG6 ^s62z7
*/ /^P^K
public class CountCache { ;!Ojb
public static LinkedList list=new LinkedList(); T,`'qZ>
/** Creates a new instance of CountCache */ B#B$w_z
public CountCache() {} J55K+
public static void add(CountBean cb){ zTAt% w5
if(cb!=null){ Haaungb"
list.add(cb); %*oz~,i
} E)09M%fe
} cx1U6A+
} {ylc2 1
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CountControl.java 9K Ih}Q@P
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/* NA]7qb%%<
* CountThread.java [qIi_(%o
* ;]i&AAbj
* Created on 2007年1月1日, 下午4:57 G>YJ3p7
* )[~ #j6
* To change this template, choose Tools | Options and locate the template under \#m;L/D
* the Source Creation and Management node. Right-click the template and choose &:S_ewJK7
* Open. You can then make changes to the template in the Source Editor. Kbg`ZO*
*/ y@nWa\iG
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package com.tot.count; [I4K`>|Z
import tot.db.DBUtils; o!aKeM~|Es
import java.sql.*; Olj]A]v}
/** n&r-
* N#bWMZ"
* @author (=QaAn,,R
*/ ie
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public class CountControl{ 5w@ ;B
private static long lastExecuteTime=0;//上次更新时间 v"F.<Q
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 dt',)i8D
/** Creates a new instance of CountThread */ &oWWc$
public CountControl() {} Hm-+1Wx
public synchronized void executeUpdate(){ B(:Kw;r?
Connection conn=null; |n}W^}S5
PreparedStatement ps=null; --Dw
try{ c1jHg2xim
conn = DBUtils.getConnection(); {,]BqFXv
conn.setAutoCommit(false); MN$j{+ !Q
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ^;6~=@#*C
for(int i=0;i<CountCache.list.size();i++){ P9B@2#
CountBean cb=(CountBean)CountCache.list.getFirst(); 0u,=OvU
CountCache.list.removeFirst(); e%R+IH5i
ps.setInt(1, cb.getCountId()); f`:e#x
ps.executeUpdate();⑴ hIXGfvUy
//ps.addBatch();⑵ QTz{ZNi!
} U4 m[@wF
//int [] counts = ps.executeBatch();⑶ ;}A#ws_CD_
conn.commit();
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}catch(Exception e){ 9(|[okB
e.printStackTrace(); kZU8s'C
} finally{ tmRD$O%:
try{ cEsBKaN
if(ps!=null) { i\3BA"ZX
ps.clearParameters(); -102W{V/T
ps.close(); W ;P1T"*A
ps=null; 'uo `-Y
} u5H#(&Om
}catch(SQLException e){} } <2F]UuR
DBUtils.closeConnection(conn); j72cSRv
} ;wL*
} 1.p?P]
.
public long getLast(){ ~9kvC&/{[
return lastExecuteTime; htX'bA
} CBnD)1b\
public void run(){ S82NU2L
long now = System.currentTimeMillis(); hX`WVVoF
if ((now - lastExecuteTime) > executeSep) { MeQ(,irr^
//System.out.print("lastExecuteTime:"+lastExecuteTime); ,RCjfXa
//System.out.print(" now:"+now+"\n"); \$?[>=<wB
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); )N)ziAy}
lastExecuteTime=now; +(/XMx}a
executeUpdate(); smIZ:L%
} "sAR<5b
else{ thipfS
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); pr;<n\Y{
} 6ynQCD
} R:E6E@T
} <j:3<''o
//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 XhWMvme
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类写好了,下面是在JSP中如下调用。 v0"|J3
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<% X-:Ni_O\ty
CountBean cb=new CountBean(); AN^ ,
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ])m",8d&T
CountCache.add(cb); Wn0r[h5t
out.print(CountCache.list.size()+"<br>"); <Ks?g=K-
CountControl c=new CountControl(); eb9qg.9Z
c.run(); rJ\A)O+Mq(
out.print(CountCache.list.size()+"<br>"); "*+epC|ks
%>