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: ,NVsn
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CountBean.java /iV}HV0
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/* pL%r,Y_^\x
* CountData.java Zg`Mz
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* {aJJ`t
* Created on 2007年1月1日, 下午4:44 L^4-5`gj
* 15o?{=b[
* To change this template, choose Tools | Options and locate the template under {aC!~qR
* the Source Creation and Management node. Right-click the template and choose ' dx1x6
* Open. You can then make changes to the template in the Source Editor. 6]pX>Xho
*/ FEW_bP/4
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package com.tot.count; V-r3-b
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/** UNi`P9D]3
* JA_BKA
* @author -yg?V2
*/ Io|Aj
public class CountBean { j$Je6zq0x
private String countType; R
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int countId; <K4,7J$}h
/** Creates a new instance of CountData */ (?! ,p^
public CountBean() {} ^3FE\V/=
public void setCountType(String countTypes){ ~/ilx#d
this.countType=countTypes; .eO?Z^
} FSbHn{@
public void setCountId(int countIds){ fiN3xP]V
this.countId=countIds; &"mzwQX
} V@QK
public String getCountType(){ d4 (/m_HMu
return countType; A
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} V)i5=bHC
public int getCountId(){ k') E/n
return countId; a9?y`{%L
} z|(+|pV(
} ^@_m "^C
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CountCache.java 3u\;j; Td!
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/* !;!~n`
* CountCache.java `O8b1-1q~
* &h,5:u
* Created on 2007年1月1日, 下午5:01 7 #=}:3c
* 7RvUH-S[
* To change this template, choose Tools | Options and locate the template under lw(e3j
* the Source Creation and Management node. Right-click the template and choose X5*C+ I=2
* Open. You can then make changes to the template in the Source Editor. Lh-`OmO0>F
*/ rqlc2m,<-p
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package com.tot.count; Q9`QL3LQD
import java.util.*; z>[tF5
/** X}6#II
* ?n\*,{9
* @author HOp-P8z
*/ Jj^GWZRu
public class CountCache { =4 X]gW
public static LinkedList list=new LinkedList(); Fequm+
/** Creates a new instance of CountCache */ g+C!kaC)
public CountCache() {} 5b6s4ZyV
public static void add(CountBean cb){ N|2y"5
if(cb!=null){ M'1!<a-Mp
list.add(cb); 8%~t
} -6Mm#sX
} D["MUB4l
} HZ*0QgW\(5
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CountControl.java qYp$fmj
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/* wn11\j&
* CountThread.java Kt.~aaG_
* K$REZe
* Created on 2007年1月1日, 下午4:57 )J3kxmlzQ
* >LF&EM]
* To change this template, choose Tools | Options and locate the template under )-/gLZsx
* the Source Creation and Management node. Right-click the template and choose YTU.$t;Ez
* Open. You can then make changes to the template in the Source Editor. cUDg M
*/ T_OF7?
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package com.tot.count; 5GAy "Xd
import tot.db.DBUtils; 1:= `Y@.S
import java.sql.*; 2#_38=K=@
/** BZF,=v
* 8Xm@r#Oy5
* @author S9Yt 1qb
*/ 0d\~"4 R
public class CountControl{ =J|sbY"]
private static long lastExecuteTime=0;//上次更新时间 s!6=|SS7
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Dr"/3xm
/** Creates a new instance of CountThread */ :nQp.N*p
public CountControl() {} 27#8dV?
public synchronized void executeUpdate(){ zb2K;%Qs+f
Connection conn=null; @5}gsC
PreparedStatement ps=null; CJqc\I~
try{ Ds5NAp:x
conn = DBUtils.getConnection(); >v0 :qN7|
conn.setAutoCommit(false); G+Dpma ]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); {(vOt '
for(int i=0;i<CountCache.list.size();i++){ R.7#zhC`4
CountBean cb=(CountBean)CountCache.list.getFirst(); {:Vf0Mhb
CountCache.list.removeFirst(); IG / $!*E
ps.setInt(1, cb.getCountId()); <FmBa4ONU
ps.executeUpdate();⑴ P&t;WPZ
//ps.addBatch();⑵ >x'bZ]gm
} %N~;{!![p
//int [] counts = ps.executeBatch();⑶ V8'`nuC+
conn.commit(); d~[UXQC
}catch(Exception e){ gGKKs&n7
e.printStackTrace(); ~+m,im8}
} finally{ @
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try{ Tj,2r]g`<
if(ps!=null) { .k]#XoE
ps.clearParameters(); 4
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ps.close(); OKQLv+q5K)
ps=null; <-|SIF
} Y(GW0\<
}catch(SQLException e){} RWahsJTu
DBUtils.closeConnection(conn); uJPH~mdW
} 9U10d&M(
} Gj`f--2GE
public long getLast(){ ~N[|bPRmhE
return lastExecuteTime; !3KPwI,
} +(AwSh !
public void run(){ lCE2SKj
long now = System.currentTimeMillis(); &HxT41pku
if ((now - lastExecuteTime) > executeSep) { p#M!S2&z
//System.out.print("lastExecuteTime:"+lastExecuteTime); K.h]JD]o
//System.out.print(" now:"+now+"\n"); #KJZR{
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); $SF3odpt
lastExecuteTime=now; +UaO<L
executeUpdate(); kh&_#,
} 0|Q.U
else{ jf7pl8gv
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Isp_U5M
} B'/Icg.T
} sWW\bK0B4
} D'?]yyrf
//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 ./)j5M
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类写好了,下面是在JSP中如下调用。 T`mEO\f
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<% />!!ch
CountBean cb=new CountBean(); 'Ix5,^M}B
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); d5q4'6o,
CountCache.add(cb); a}GAB@YI
out.print(CountCache.list.size()+"<br>"); :b,o B==%
CountControl c=new CountControl(); \
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c.run(); bN4d:0 Y
out.print(CountCache.list.size()+"<br>"); Z#LUez;&t#
%>