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: 6,]2;'
QEEX|WM
CountBean.java 'YEiT#+/
e co=ia
/* &0mhO+g
* CountData.java *gI9CVfQl
* 5JZZvc$au
* Created on 2007年1月1日, 下午4:44 ND5E`Va5R
* /PkOF((
* To change this template, choose Tools | Options and locate the template under lqKwjJtX
* the Source Creation and Management node. Right-click the template and choose C,u;l~zz
* Open. You can then make changes to the template in the Source Editor. .|K\1qGW0
*/ uMBb=
U4Pk^[,p1G
package com.tot.count; $P&27
b*a}~1
/** CjA}-ee
* w2tkJcQ3
* @author '`p0T%w
*/ vaZ?>94
public class CountBean { q5w)i
private String countType; <7X+-%yb;
int countId; tQ4{:WPG
/** Creates a new instance of CountData */ Zn'y"@%t[
public CountBean() {} T0}P 'q
public void setCountType(String countTypes){ ~0 n9In%
this.countType=countTypes; Jaf=qwZ/`
} j0jam:.p
public void setCountId(int countIds){ PvdR)ZEm
this.countId=countIds; !Jo.Un7
} *Xd_=@L&B
public String getCountType(){ 14\!FCe)!
return countType; o-t!z'\lO
} .LNqU#a
public int getCountId(){ D%.<}vG
return countId; yM34G S=,J
} 1'* {VmM
} Xgm9>/y
Mq,_DQ
CountCache.java vGPaW YV
JGk,u6K7
/* n1c Q#u
* CountCache.java M,UYDZ',
* Bb/aeLv
* Created on 2007年1月1日, 下午5:01 j Ns eD
* #kGxX@0
* To change this template, choose Tools | Options and locate the template under 8%9OB5?F6
* the Source Creation and Management node. Right-click the template and choose |zL .PS
* Open. You can then make changes to the template in the Source Editor. Xq%!(YD|
*/ 5(OF~mX#
~
.Eln+N
package com.tot.count; ~9ILN~91
import java.util.*; v6?<)M%
/** ,K[B/tD{j
* w@2LFDp
* @author QfM*K.7Sl
*/ v]27+/a$c
public class CountCache { ? 5
V-D8k
public static LinkedList list=new LinkedList(); %25_
/** Creates a new instance of CountCache */ ) uyh
public CountCache() {} y/2U:H
public static void add(CountBean cb){ Sq==)$G
if(cb!=null){ HM1y$ej
list.add(cb); IN]bAd8"
} 4B}w;d@R
} P6 G/J-
} Dy^4^ J5+
]R{=|
CountControl.java 2=NYBOE
Q-&]Vg
/* _mL 9G5~r
* CountThread.java PX'I:B]x*
* jW",'1h<n
* Created on 2007年1月1日, 下午4:57 L=}UApK
* +=@Z5eu
* To change this template, choose Tools | Options and locate the template under p:ST$ 1 K
* the Source Creation and Management node. Right-click the template and choose P-`^I`r
* Open. You can then make changes to the template in the Source Editor. osX23T~-
*/ _.06^5o
F]?$Q'U
package com.tot.count; @kwD$%*0
import tot.db.DBUtils; 7"JU)@ U]
import java.sql.*; U>x2'B v
/** C5RDP~au
* uf)W?`e~
* @author =-pss 47
*/ A?|cJ"N
public class CountControl{ :7>Si%
private static long lastExecuteTime=0;//上次更新时间 [I4FU7mpH
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 MgMLfgt"V
/** Creates a new instance of CountThread */ 7<^D7
public CountControl() {} +msHQk5#$m
public synchronized void executeUpdate(){ |_2ANWHz
Connection conn=null; gkk <-j'
PreparedStatement ps=null; 8h20*@wSN
try{ -{b1&
conn = DBUtils.getConnection(); 6l
vx
conn.setAutoCommit(false); e#HP+b$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [Iihk5TT
for(int i=0;i<CountCache.list.size();i++){ 3Yj}ra}
CountBean cb=(CountBean)CountCache.list.getFirst(); (Fgt #H(B
CountCache.list.removeFirst(); Nyqm0C6m^
ps.setInt(1, cb.getCountId()); Dfhs@ z
ps.executeUpdate();⑴ fZ g*@RR
//ps.addBatch();⑵ *u{.K:.I
} 1v\-jM"
//int [] counts = ps.executeBatch();⑶ M9OFK\)
conn.commit(); T*T.\b
}catch(Exception e){ Z%OS W
e.printStackTrace(); #!D5DK@+
} finally{ QT&{M
#Ydn
try{ MM8)yCI
if(ps!=null) { };!c]/,
ps.clearParameters(); "^D6%I#T
ps.close(); NJtB ;
ps=null; eu:_V+
} ;W*$<~_
}catch(SQLException e){} E0DEFB
DBUtils.closeConnection(conn); eXaDx%mM
} `A^} X
} -<O:isB
public long getLast(){ 8c|IGC
return lastExecuteTime; \%Smp2K
} M{4_BQ4$
public void run(){ +Ae.>%}
long now = System.currentTimeMillis(); >SGSn/AJi
if ((now - lastExecuteTime) > executeSep) { er#=xqUY
//System.out.print("lastExecuteTime:"+lastExecuteTime); hW+Dko(s
//System.out.print(" now:"+now+"\n"); 1a!h&!$9
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); T+ t-0k
lastExecuteTime=now; tQ}gBE63
executeUpdate(); z*[Z:
} j{Fo 6##
else{ 4#YklVm
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); si;]C~X*
} d?P
aZz{4
} I.<#t(io
} ;hZ@C!S:
//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 5nn*)vK {
Bm7GU`j"
类写好了,下面是在JSP中如下调用。 -/qrEKQ0U?
FTenXJ/c
<% dCK-"#T!
CountBean cb=new CountBean(); HY:@=%R
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); D_)vGvv3;.
CountCache.add(cb); T:&+#0<
out.print(CountCache.list.size()+"<br>"); N.`]D)57
CountControl c=new CountControl(); @&W?e?O ~G
c.run(); ,i,=LGn
out.print(CountCache.list.size()+"<br>"); nJya1AH;
%>