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: >Vvjs
K3($,aB}
CountBean.java )Y:9sd8g7
r%^J3
/* y&8kORz;?
* CountData.java (XJ0?;js=
* [!CIBK99
* Created on 2007年1月1日, 下午4:44 ZJeTx.Gi6
* 0'O*Y
]h+
* To change this template, choose Tools | Options and locate the template under .P>-Fh,_p
* the Source Creation and Management node. Right-click the template and choose K%/:V
* Open. You can then make changes to the template in the Source Editor. 6fr@y=s2:
*/ 'AjDB:Mt$
Bm&% N?9
package com.tot.count; \"^.>+
{^qp~0
/** __N#Y/e ]
* -yH8bm'0"
* @author FELTmQUV
*/ I:9jn"
public class CountBean { Lm}J&^>
private String countType; eFiUB
int countId; &@anv.D
/** Creates a new instance of CountData */ G,6Zy-Y9
public CountBean() {} _6,Tb]
public void setCountType(String countTypes){ 9X6l`bo'
this.countType=countTypes; Jf|6 FQo&
} dDoKmuY>5
public void setCountId(int countIds){ #Z.2g].
this.countId=countIds; lqe71](sK8
} /"*eMe!=
public String getCountType(){ _>"f&nbO
return countType; A]k-bX= s
} qq1@v0
public int getCountId(){ Z}*{4V`R
return countId; 1__Mf.A
} %x G3z7;
} :?.RZKXQF
js#72T/_n
CountCache.java bRzw.(k0`r
\L@DDK|"`6
/* ]E/~PV
* CountCache.java S66..sa
* {~RS$ |
* Created on 2007年1月1日, 下午5:01 b\^q9fy
* _~_E(rTn
* To change this template, choose Tools | Options and locate the template under `[*n UdG
* the Source Creation and Management node. Right-click the template and choose Yo$
xz
* Open. You can then make changes to the template in the Source Editor. Q1yj+)_
*/ $JTQA
PfKF!/c
B
package com.tot.count; "o
^cv
import java.util.*; erC )2{m
/** hL8GW> `a
* *>,CG:`D
* @author V<+=t{
*/ j~a"z4 0
public class CountCache { yd-Kg zm8n
public static LinkedList list=new LinkedList(); 1VD8y_tC
/** Creates a new instance of CountCache */ }&h*bim
public CountCache() {} #& 5}
public static void add(CountBean cb){ M((]> *g
if(cb!=null){ }#h >*+Q
list.add(cb); h*JzJ0X
} />,Tq!i\4}
} O5:2B\B
} =Hs[peO*
s/"?P/R
CountControl.java 6HyndB^
">pt,QV
/* '"/Yk=EmlU
* CountThread.java 4tb y N
* q0l=S+0
* Created on 2007年1月1日, 下午4:57 aN/0'V|&ym
* 'l| e}eti>
* To change this template, choose Tools | Options and locate the template under J"&jR7-9
* the Source Creation and Management node. Right-click the template and choose WLe9m02r
* Open. You can then make changes to the template in the Source Editor. zAxscDf'
*/ Fu%%:3_
b+ g(=z+
package com.tot.count; 2W_p)8t>b
import tot.db.DBUtils; DG!H8^
import java.sql.*; S|pMX87R
/** \~:Uj~
* AUk,sCxd
* @author ;GgW&*|
*/ =QiVcw,G#
public class CountControl{ )t-Jc+*A>
private static long lastExecuteTime=0;//上次更新时间 wf=
s-C
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 m<DiYxK
/** Creates a new instance of CountThread */ y
;$8C
public CountControl() {} WjrUns
public synchronized void executeUpdate(){
69o,T`B
Connection conn=null; ~baVS-v
PreparedStatement ps=null; APC,p,"
try{ BV8-\R@
conn = DBUtils.getConnection(); ?1G7=R
conn.setAutoCommit(false); d? Old
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); lhk[U!>#
for(int i=0;i<CountCache.list.size();i++){ 4%3R}-'mh
CountBean cb=(CountBean)CountCache.list.getFirst(); S-8wL%r
CountCache.list.removeFirst(); 2KUm(B.I
ps.setInt(1, cb.getCountId()); RKY~[IQ,
ps.executeUpdate();⑴ 9EE},D
//ps.addBatch();⑵ hpqM
f z1
} Y}/e"mp
//int [] counts = ps.executeBatch();⑶ `a!:-.:v
conn.commit(); -666|pA
}catch(Exception e){ ]ZB^Hi_
e.printStackTrace(); 6^oQ8unmS
} finally{ ZDI%?.U
try{ P a{)@xT
if(ps!=null) { J*lKXFq7
ps.clearParameters(); _7O;ED+
ps.close(); I\BcG(hlJ
ps=null; GomTec9.
} (61_=,jv\h
}catch(SQLException e){} ^zMME*G
DBUtils.closeConnection(conn); A@W/
} [CBhipoc
} QB Nnvg4v
public long getLast(){ a*pwVn
return lastExecuteTime; g@va@*|~d
} 0! :1o61
public void run(){ [`_ZlC
long now = System.currentTimeMillis(); JMUk=p<\
if ((now - lastExecuteTime) > executeSep) { B4<W%lm
//System.out.print("lastExecuteTime:"+lastExecuteTime); '>}dqp{Wr
//System.out.print(" now:"+now+"\n"); [&Z3+/lR*
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); #DN5S#Ic
lastExecuteTime=now; @-~
)M_
executeUpdate(); Q
UQ"2oC
} m5G9
B-\?
else{ 4TBK:Vm5
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {G+pI2^
} lYS+EVcR
} me#?1r
} $ON4nx
//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 abHW[VP9
VPKoBJ&
类写好了,下面是在JSP中如下调用。 Nvlfi8.
$ylQ \Y'
<% wz,T7L
CountBean cb=new CountBean(); *q ?-M"K
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Hyw T
CountCache.add(cb); nZfU:N
out.print(CountCache.list.size()+"<br>"); <*g!R!
CountControl c=new CountControl(); b;N[_2
c.run(); 3c"$@W:>
out.print(CountCache.list.size()+"<br>"); g=*`6@_=
%>