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: +!@xH];
1N),k5I
CountBean.java g,E)F90
v0r:qku
/* C=c&.-Nb9
* CountData.java J*g<]P&p0
* CMC p7-v
* Created on 2007年1月1日, 下午4:44 GGHMpQ
* |%4nU#GoB
* To change this template, choose Tools | Options and locate the template under h(2{+Y+
* the Source Creation and Management node. Right-click the template and choose Gad&3M0r
* Open. You can then make changes to the template in the Source Editor. []\-*{^r
*/ tqA-X[^
oItC;T
package com.tot.count; f$ /C.E
g?1bEOA!
/** [GknE#p
* UHY)+6qt]
* @author {(-TWh7V
*/ (QFZM"G
public class CountBean { Z+R-}<
private String countType; lxTqGwx
int countId; je\]j-0$u
/** Creates a new instance of CountData */ !@gjIYq_Y
public CountBean() {} }0R"ZPU1Rw
public void setCountType(String countTypes){ _u-tRHh|A
this.countType=countTypes; 0lt1/PEKx2
} (Vey]J
public void setCountId(int countIds){ ^N}{M$
this.countId=countIds; 7<jr0)
} &}gH!5L m
public String getCountType(){ ]mBlXE:Z
return countType; #)D$\0ag
} BI2'NN\
public int getCountId(){ Q-_;.xy#4
return countId; a&)$s;
} !G;BYr>X
} OG IN-
0Q%I[f8
CountCache.java eJOo~HIWQ
t2ui9:g4j
/* @6 jKjI
* CountCache.java ;).QhHeg>
* On4Vqbks
* Created on 2007年1月1日, 下午5:01 09Oe-Bg
* Xa8_kv_
* To change this template, choose Tools | Options and locate the template under @)ozgs@e
* the Source Creation and Management node. Right-click the template and choose Wbmqf
s
* Open. You can then make changes to the template in the Source Editor. PClwGO8'&
*/ f$nZogaQ
ku v<
package com.tot.count; +DT
tKj
import java.util.*; AxJf\B8
/** 0} \;R5a<
* 1
xr mmK
* @author G* mLb1
*/ o,1Fzdh6(
public class CountCache { uN9.U _
public static LinkedList list=new LinkedList(); arPqVMVr
/** Creates a new instance of CountCache */ :fG9p`
public CountCache() {} 2\}6b4
public static void add(CountBean cb){ +/*A}!#v
if(cb!=null){ w RTzpG4
list.add(cb); NLWj5K)1P
} 9LEUj
} $<wU>X
} K0^+2lx
%]DJ-7 xE
CountControl.java d cht8nX7~
5PHAd4=bJ
/* Wm58[;%LTw
* CountThread.java 9hwn,=Vh)
* 9NC6q-2
* Created on 2007年1月1日, 下午4:57 j|% C?N
* D2Kh+~l
* To change this template, choose Tools | Options and locate the template under `H;O! ty&d
* the Source Creation and Management node. Right-click the template and choose ]kkH|b$[T
* Open. You can then make changes to the template in the Source Editor. 2L2)``*
*/ 7 ( /
[VB\T|$
package com.tot.count; 6v-2(Y
import tot.db.DBUtils; `_e 1LEH
import java.sql.*;
- zEQ/6
/** W$Z""
* ?6^KY+ 5`C
* @author *O-si%@]
*/ Y6%O 9b
public class CountControl{ gJn_8\,C>Q
private static long lastExecuteTime=0;//上次更新时间 c;7ekj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9%uJ:c?
/** Creates a new instance of CountThread */ u-Ip *1/wp
public CountControl() {} Qgv-QcI{
public synchronized void executeUpdate(){ /Big^^u
Connection conn=null; QXT*O
PreparedStatement ps=null; oY%NDTVN
try{ s2+s1%^Ll
conn = DBUtils.getConnection(); _q\w9gN
conn.setAutoCommit(false); Q_R&+@ju
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (OK;*ZH+T@
for(int i=0;i<CountCache.list.size();i++){ G0h7MO%x
CountBean cb=(CountBean)CountCache.list.getFirst(); blB00
CountCache.list.removeFirst(); 4[]4KKO3Q2
ps.setInt(1, cb.getCountId()); @xtfm.}
ps.executeUpdate();⑴ au1(.(
//ps.addBatch();⑵ C@
z^{Z+
} \xaK?_hv
//int [] counts = ps.executeBatch();⑶ g*#.yC1/
conn.commit(); gTP0:
}catch(Exception e){ aq,?
e.printStackTrace(); RnkrI~x
} finally{ E^jb#9\R
try{ [<{+tAdn)
if(ps!=null) { '.DFyHsq
ps.clearParameters(); ~lLIq!!\
ps.close(); ugt|'i
ps=null; G_x<2E"d
} 6d3-GMUQ
}catch(SQLException e){} X}3o
DBUtils.closeConnection(conn); oW/ #/;|`
} ) crhF9 !4
} |P]>[}mD
public long getLast(){ viY &D
return lastExecuteTime; ;/Dp
} :>g*!hpb
public void run(){ F\;G'dm
long now = System.currentTimeMillis(); HI30-$9
if ((now - lastExecuteTime) > executeSep) { Nu'T0LPNq(
//System.out.print("lastExecuteTime:"+lastExecuteTime); E|d 8vt
//System.out.print(" now:"+now+"\n"); =sW(2Im
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); It@.U|
lastExecuteTime=now; M1T)e9k=x
executeUpdate(); 3 tp'}v
} T/&4lJ^2l^
else{ {aWTT&-N
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); q>*+.~
} 8?O6IDeW
} 5}4r'P$m:
} F|XRh 6j
//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 /_P5UE(
!7lS=D(?
类写好了,下面是在JSP中如下调用。 >h7qI-
2 -uL
<% LMrb
1lg$
CountBean cb=new CountBean(); X)|b_ 3Z
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
um[nz
CountCache.add(cb); aD@sb o
out.print(CountCache.list.size()+"<br>"); n15F4DnP
CountControl c=new CountControl(); >\ :kP>U
c.run(); KZw"?%H[
out.print(CountCache.list.size()+"<br>"); f6ad@2
%>