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: [66!bM&
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CountBean.java ^Va1f'g
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/* i@R
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* CountData.java c7E11 \%&Z
* 'XBFv9&
* Created on 2007年1月1日, 下午4:44 3<zp
* *
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* To change this template, choose Tools | Options and locate the template under a -moI+y
* the Source Creation and Management node. Right-click the template and choose 2,P^n4~A?w
* Open. You can then make changes to the template in the Source Editor. L z1ME(
*/ UOmY-\ &c
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package com.tot.count; UEVG0qF
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/** m<g~H4
* {$Gd2gO
* @author c:u5\&~{
*/ uL/m u<
public class CountBean { )@'}\_a3[]
private String countType; C=4Qlt[`
int countId; P}G+4Sk
/** Creates a new instance of CountData */ D{~fDRR
public CountBean() {} U!Z,xx[]
public void setCountType(String countTypes){ K:Q<CQ2
this.countType=countTypes; iRi-cQVy
} % -e 82J1
public void setCountId(int countIds){ ~**.|%Kc
this.countId=countIds; '-/xyAzS
} -8rjgB~."/
public String getCountType(){ xpx\=iAe
return countType; A6iq[b]
} Nl(3Xqov
public int getCountId(){ K>l~SDcZ3
return countId; 78H'ax9m
} Nm>A'bLM
} W1FI mlXS
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CountCache.java +|>kCtZH%
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/* we?76t:-
* CountCache.java N<KS(@v
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* Created on 2007年1月1日, 下午5:01 *~j@*{u
* a"g!e^
* To change this template, choose Tools | Options and locate the template under *%t^;&x?
* the Source Creation and Management node. Right-click the template and choose E'.7xDN
* Open. You can then make changes to the template in the Source Editor. 3CGp`~Zf
*/ a,#j =
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package com.tot.count;
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import java.util.*; }:*]aL<7_
/** x*&|0n.D
* Ziu]'#
* @author nSAdCJ;4
*/ RTJ3qhY
public class CountCache { 9
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public static LinkedList list=new LinkedList(); yU}qOgXx
/** Creates a new instance of CountCache */ bl(RyAgA
public CountCache() {} M*HnM(
public static void add(CountBean cb){ u4%Pca9(=
if(cb!=null){ 0aa&m[Mk
list.add(cb); I[##2
} \1 &,|\E#
} l9u!aD
} FA3~|Zg
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CountControl.java 'B0{_RaTb
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/* `&sH-d4v
* CountThread.java Jh[UtYb5
* GMl;7?RA
* Created on 2007年1月1日, 下午4:57 - kwXvYu\
* :#?5X|Gz
* To change this template, choose Tools | Options and locate the template under f|lU6EkU
* the Source Creation and Management node. Right-click the template and choose i`$*Ty"x
* Open. You can then make changes to the template in the Source Editor. X;c'[q
*/ tX %5BTv
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package com.tot.count; KOuCHqCfq
import tot.db.DBUtils; p\ZNy\N^
import java.sql.*; s;vHPUB\n
/** rOOT8nkR#
* I4q9|'-yx
* @author A_5P/ARmI
*/ 0h\smqm
public class CountControl{ -Z
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private static long lastExecuteTime=0;//上次更新时间 ndz]cx
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 vucxt }Ti
/** Creates a new instance of CountThread */ Om@C
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public CountControl() {} 2!J&+r
public synchronized void executeUpdate(){ K;z7/[%
Connection conn=null; t*T2Z-!P
PreparedStatement ps=null; }m;,Q9:+m^
try{ o-OHjFfB
conn = DBUtils.getConnection(); lun\`f 5Q
conn.setAutoCommit(false); M={V|H0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >P@H#=
for(int i=0;i<CountCache.list.size();i++){ 8tFoN*M
CountBean cb=(CountBean)CountCache.list.getFirst(); EbE-}>7OO
CountCache.list.removeFirst(); MgrLSKLT
ps.setInt(1, cb.getCountId()); m6CI{Sa](l
ps.executeUpdate();⑴ @A89eZbW
//ps.addBatch();⑵ <\ :Yk
} j; y#[|
//int [] counts = ps.executeBatch();⑶ &wCg\j_c
conn.commit(); K[r^'P5m
}catch(Exception e){ _JE"{ ;
e.printStackTrace(); b@f$nS
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} finally{ '*w00
try{ k $J zH$
if(ps!=null) { [knN:{ l
ps.clearParameters(); r^paD2&}
ps.close(); /%TI??PGu
ps=null; 'JfdV%M
} lP@Ki5
}catch(SQLException e){} pd;br8yE$@
DBUtils.closeConnection(conn); i?g5_HI
} ^xh ;
} LNpup`>`
public long getLast(){ #32"=MfQn
return lastExecuteTime; % <*g!y `
} HbAkZP
public void run(){ 0ANZAX5
long now = System.currentTimeMillis(); kZZh"#W: L
if ((now - lastExecuteTime) > executeSep) { _p&]|~a
//System.out.print("lastExecuteTime:"+lastExecuteTime); ZR]25Yy
//System.out.print(" now:"+now+"\n"); )~] (&
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); NzOo0tz:
lastExecuteTime=now; IS
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executeUpdate(); Oz`BEyb]{
} e`TH91@
else{ ,\ k(x>oy
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); r)~ T@'y
} Vq\`+&A
} S` ;?z
} s<_)$}
//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 }O^zl#
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类写好了,下面是在JSP中如下调用。 ^T$|J;I
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CountBean cb=new CountBean(); *q".-u!D[
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); <|+Ex
CountCache.add(cb); O6/f5
out.print(CountCache.list.size()+"<br>"); pd7NF-KD
CountControl c=new CountControl(); -[!P!d=
c.run(); Ry K\uv
out.print(CountCache.list.size()+"<br>"); af+IP_6
.
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