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: :XYy7xz<
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CountBean.java jA<T p}$!
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/* 6c &Y
* CountData.java !W~<q{VTs
* <xqba4O
* Created on 2007年1月1日, 下午4:44 { 8p\Y
* SK-W%t
* To change this template, choose Tools | Options and locate the template under @[v8}D
* the Source Creation and Management node. Right-click the template and choose %t[K36,p
* Open. You can then make changes to the template in the Source Editor. {(Fe7,.S3
*/ t!~S9c
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package com.tot.count; u|OtKq
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/** hDvpOIUL1
* Gkmsaf>
* @author "lrA%~3%[P
*/ N,|r1u 9X#
public class CountBean { A?,A(-0C
private String countType; $:;%bjSI
int countId; l[*sHi
/** Creates a new instance of CountData */ rN#\AN
public CountBean() {} 'Sa!5h
public void setCountType(String countTypes){ mgcN( n1
this.countType=countTypes; 2*Q3.2 Z
} Y&GuDLUF
public void setCountId(int countIds){ ,C:o`fQ\
this.countId=countIds; $3#%aA!(#
} FUqt)YHi
public String getCountType(){ ^Plc}W7h
return countType; m[rL\](-
} eEP(
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public int getCountId(){ SH=:p^J
return countId; $
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} ET+'Pj3
} iaRR5D-
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CountCache.java @n@g)`
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/* iC*U $+JG
* CountCache.java O^NP0E
* WK4@:k
m6)
* Created on 2007年1月1日, 下午5:01 \O? u*
* > UWStzH<
* To change this template, choose Tools | Options and locate the template under De]^&qw(
* the Source Creation and Management node. Right-click the template and choose zt?H~0$LB
* Open. You can then make changes to the template in the Source Editor. W>$BF[x!{
*/ [pR)@$"k'
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package com.tot.count; [+Un ^gD
import java.util.*; o(Kcs-W2
/** [gZDQcU
* k%Eh{dA
* @author i| 4_m
*/ G"> 0]LQ
public class CountCache { 2-s 7cXs
public static LinkedList list=new LinkedList(); OZT^\Ky_l
/** Creates a new instance of CountCache */ sg$4G:l
public CountCache() {} [#Fg\2bq_y
public static void add(CountBean cb){ @yKZRwg
if(cb!=null){ rS,j;8D-
list.add(cb); xlw 2g<s
} p8>R#9
} WIG=D{\Yx
} Tq#<Po $
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CountControl.java q^]tyU!w
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/* _+n;A46
* CountThread.java w[sR7T9*
* [Xh\mDU.
* Created on 2007年1月1日, 下午4:57 [>p6
* b0YNac.l
* To change this template, choose Tools | Options and locate the template under Qi:j)uDW
* the Source Creation and Management node. Right-click the template and choose ~p^7X2% !
* Open. You can then make changes to the template in the Source Editor. Qc3?}os2
*/ )E~_rDTl
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package com.tot.count; : I)G v
import tot.db.DBUtils; Bk@WW#b
import java.sql.*; {82rne`[
/** UE;Bb*<
* R,b59,&3/
* @author v
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*/ x~Agm_Tu+'
public class CountControl{ 0[9I0YBJ
private static long lastExecuteTime=0;//上次更新时间 Mr.JLW
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 L$}g3{
/** Creates a new instance of CountThread */ PGY9*0n
public CountControl() {} }$:#+
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public synchronized void executeUpdate(){ pyF5S,c
Connection conn=null; XN(tcdCG
PreparedStatement ps=null; {_7Hz,2U
try{ \k4pK &b
conn = DBUtils.getConnection(); 8Z!*[c>K-?
conn.setAutoCommit(false); +f|6AeE
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); IfB/O.;Kz
for(int i=0;i<CountCache.list.size();i++){ XNlhu^jh
CountBean cb=(CountBean)CountCache.list.getFirst(); C fSl
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CountCache.list.removeFirst(); n}:t<
ps.setInt(1, cb.getCountId()); AsAFUuI
ps.executeUpdate();⑴ n.Vtc-yZU
//ps.addBatch();⑵ u}m.}Mws
} :MBS>owR
//int [] counts = ps.executeBatch();⑶ J 8q
conn.commit(); y1u9B;Fd
}catch(Exception e){ ?@3&dk~ni
e.printStackTrace(); zp#:EZ
} finally{ B.6`cM^
try{ h>|u:]I>
if(ps!=null) { ]v GgJ<
ps.clearParameters(); r w\D>}\
ps.close(); {U6"]f%
ps=null; [ro t
} xx0k$Dqt2I
}catch(SQLException e){} |!xpYT:
DBUtils.closeConnection(conn); KGQC't
} Rn;VP:H M
} ]?#
#))RUS
public long getLast(){ RJ*F>2
return lastExecuteTime; f@x_#ov
} \n;g2/VjO
public void run(){ :ol6%Z's
long now = System.currentTimeMillis(); )Oe`s(O@[I
if ((now - lastExecuteTime) > executeSep) { N33AcV!*8
//System.out.print("lastExecuteTime:"+lastExecuteTime); 6? !I
//System.out.print(" now:"+now+"\n"); X(b1/lzA
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); FF3&Y^+^"
lastExecuteTime=now; fCr\u6Tb
executeUpdate(); Gql`>~
} tIp{},bQ^
else{ 3`ml;
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); j[H0SBKC
} Ge0Lb+<G
} =1/q)b,p)
} [,GU5,o
//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 `[bJYZBc2
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类写好了,下面是在JSP中如下调用。 lvx]jd\
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<% \kyM}5G(<0
CountBean cb=new CountBean(); Vpw[B.v
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5Edo%Hd6
CountCache.add(cb); -)6;0
out.print(CountCache.list.size()+"<br>"); zU
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CountControl c=new CountControl(); hMWo\qM
c.run(); ?DRR+n _
out.print(CountCache.list.size()+"<br>"); X?R
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%>