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: rQ&XHG>Q*
ln6=XDu
CountBean.java Tiimb[|
{L7+lz
/* \i<7Lk
* CountData.java GBT219Z@8
* ,8!'jE[d
* Created on 2007年1月1日, 下午4:44 2|NQ5OA0
* K=pG,[ChA
* To change this template, choose Tools | Options and locate the template under ]a[2QQ+g
* the Source Creation and Management node. Right-click the template and choose kN 0N18E
* Open. You can then make changes to the template in the Source Editor. :dxKcg7
*/ ZQ-6n1O
t{`krs``
package com.tot.count; HLL=.: P
,)VAKrSg
/** =p:~sn#
* gQ<{NQMzvd
* @author iI &z5Q2
*/ ;*=7>"o'`
public class CountBean { Zt9ld=T
private String countType; @![1W@J
int countId; _G2)=yj]
/** Creates a new instance of CountData */ `91Z]zGpU
public CountBean() {} ^SM5oK
public void setCountType(String countTypes){ SEE:v+3|
this.countType=countTypes; p=|S%
} r>sXvzv
public void setCountId(int countIds){ 31QDN0o!~
this.countId=countIds; EZT 8^m
} l j+p}dt
public String getCountType(){ - Nt8'-
return countType; 6^2='y~e
} aEun *V^,
public int getCountId(){ F'JT7#eX
return countId; #5iwDAw:|r
} xmfZ5nVL
} (CAkzgTfc
lAGntYv
CountCache.java 05
.EI)7
O[p c$Pi
/* ZkNet>9
* CountCache.java PI"6d)S2
* '?LqVzZI
* Created on 2007年1月1日, 下午5:01 ?JW/Stua
* $I<\Yuy-M9
* To change this template, choose Tools | Options and locate the template under h${=gSJc
* the Source Creation and Management node. Right-click the template and choose G+m[W
* Open. You can then make changes to the template in the Source Editor. WISK-z
*/ d^"|ESQEU
m,F4N$
package com.tot.count; r_o\72
import java.util.*; tnq ZlS
/** MI`<U:-lP
* 4OG1_6K
* @author <B+
WM
*/ K'[kl'
public class CountCache { >=3oe.$)
public static LinkedList list=new LinkedList(); nr&9\lG]G
/** Creates a new instance of CountCache */ ~Yre(8+M
public CountCache() {} <4I`|D3@
public static void add(CountBean cb){ ]DZ~"+LaG
if(cb!=null){ '"6*C*XS
list.add(cb); _znpzr9H
} S=$ \S9
} 2TQ<XHA\
} Z[kVVE9b?
fyq%-Tj
CountControl.java }RQHsS
c2PBYFCyC
/* EIOP+9zP
* CountThread.java /K<>OyR?
* bc2S?u{
* Created on 2007年1月1日, 下午4:57 Q@Cy\l
* ^>z+e"PQA
* To change this template, choose Tools | Options and locate the template under ;20sh^~
* the Source Creation and Management node. Right-click the template and choose EEHTlqvR
* Open. You can then make changes to the template in the Source Editor. i~m;Ah,#
*/ W QeQ`pM
DyRU$U
package com.tot.count; %KR2Vlh0
import tot.db.DBUtils; v\5`n@}4
import java.sql.*; gbu)bqu2x
/** Z_Y gV:jc
* d;).| .}P
* @author hh-sm8
*/ "[CR5q9Pr
public class CountControl{ zOis}$GR
private static long lastExecuteTime=0;//上次更新时间 \CYKj_c
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Uf|@h
/** Creates a new instance of CountThread */ 5zF$Q {3
public CountControl() {} ,
ksr%gR+
public synchronized void executeUpdate(){ ,fhK
Connection conn=null; 3WPZZN<K9
PreparedStatement ps=null; 7<LCX{Uw
try{ `_3Gb
conn = DBUtils.getConnection(); i8=+<d
conn.setAutoCommit(false); 2xv[cpVi
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); %D`j3cEp@
for(int i=0;i<CountCache.list.size();i++){ 5#dJga/88
CountBean cb=(CountBean)CountCache.list.getFirst(); z :A_
CountCache.list.removeFirst(); HzAw
rC
ps.setInt(1, cb.getCountId()); iz27yXHZ~
ps.executeUpdate();⑴ 0*KL*Gn
//ps.addBatch();⑵ yxi* 4R
} ,S&p\(r.
//int [] counts = ps.executeBatch();⑶ pR!m
conn.commit(); /LLo7"
}catch(Exception e){ [*r=u[67F
e.printStackTrace(); z7&m,:M
} finally{ Y,-!QFS#
try{ zOYG`:/'
if(ps!=null) { JcC2Zn6
ps.clearParameters(); `X(H,Q}*;
ps.close(); NH+N+4dEO
ps=null; ~e686L0j
} 1 ;Uc-<
}catch(SQLException e){} _CizU0S
DBUtils.closeConnection(conn); 8k^1:gt^
} AH^ud*3F
} 6h1pPx7zU
public long getLast(){ |W5lhx0U
return lastExecuteTime; tQ)l4Y 8
} wNMA)S
public void run(){ w]US-7
long now = System.currentTimeMillis(); 5L,q,kVS
if ((now - lastExecuteTime) > executeSep) { e+y%M
//System.out.print("lastExecuteTime:"+lastExecuteTime); }s.\B
//System.out.print(" now:"+now+"\n"); .G>~xm0
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); A9z3SJ\vXl
lastExecuteTime=now; fH%C&xj'&
executeUpdate(); +;
=XiB5R
} K~~LJU3
else{ Q>TNzh
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3w+ +F@(
} jm[f|4\
} M[L@ej
} 9!6u Yf+
//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 i1!Y{
Or-LQ^~
类写好了,下面是在JSP中如下调用。 )2R]KU_=g
7/dp_I}cO
<% ZpZoOdjslV
CountBean cb=new CountBean(); \<\147&)r
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); W 2A!BaH%
CountCache.add(cb); sfsK[c5bm
out.print(CountCache.list.size()+"<br>"); 0&c<1;
CountControl c=new CountControl(); $LtCI
c.run(); VA%4ssy
out.print(CountCache.list.size()+"<br>"); H:o=gP60]
%>