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: <&Xl b0
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CountBean.java m6[}KkW
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/* ya1
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* CountData.java (9RfsV4^
* f~wON>$K
* Created on 2007年1月1日, 下午4:44 %B\x
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* 3as=EYm
* To change this template, choose Tools | Options and locate the template under d eT<)'"
* the Source Creation and Management node. Right-click the template and choose "\EX)u9ze
* Open. You can then make changes to the template in the Source Editor. Xi%Og\vm5
*/ i*/i"W<
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package com.tot.count; }(8>&
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/** 2|^@=.4\
* pDlrK&;\z
* @author z*h:Nt%.
*/ I3.. Yk%7
public class CountBean { K7`6G[RMb
private String countType; hUi@T}aA|
int countId; DAb/B
/** Creates a new instance of CountData */ ;iuwIdo6c
public CountBean() {} tgKr*8t{
public void setCountType(String countTypes){ D%]S>g5k
this.countType=countTypes; 'Z~ZSu
} is8i_FoD,n
public void setCountId(int countIds){ `{:Nt#7
this.countId=countIds; Ht;Rz*}
} GIzB1cl:
public String getCountType(){ Op-z"inw
return countType; (*$F7oO<
} 2pdeJ
public int getCountId(){ ]Z5m_-I
return countId; R ?iCJ5 m
} Cg]|x+
} KV$&qM.
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CountCache.java TiI /I`A
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/* 4+q,[m-$(
* CountCache.java :41Y
* ?d3K:|g
* Created on 2007年1月1日, 下午5:01 nRc\!4
* n5kGHL2
* To change this template, choose Tools | Options and locate the template under 73rme,
* the Source Creation and Management node. Right-click the template and choose r{v3XD/
* Open. You can then make changes to the template in the Source Editor. lo>9 \ Po
*/ -$<oY88
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package com.tot.count; b_RO%L:"yL
import java.util.*; neM.M)0
/** c`;oV-f
* ~'lT8 n_
* @author IOZw[9](+
*/ Ztmh z_u7
public class CountCache { =!q]0#
public static LinkedList list=new LinkedList(); Uap0O2n
/** Creates a new instance of CountCache */ _jG|kjFTc
public CountCache() {} ~\JB)ca.
public static void add(CountBean cb){ Zb=NcEPGy
if(cb!=null){ L"
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list.add(cb); -c&=3O!
} 9SsVJ<9,R
} `{!A1xKZ
} )&_bY~P
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CountControl.java Y"bm4&'
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/* 9JP:wE~y
* CountThread.java >
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* Gt#r$.]W?o
* Created on 2007年1月1日, 下午4:57 y\^zxG*]'
* I>FL&E@K
* To change this template, choose Tools | Options and locate the template under #ae?#?/"
* the Source Creation and Management node. Right-click the template and choose E2r5Pg
* Open. You can then make changes to the template in the Source Editor. aInt[D(
*/ .)[E`a
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package com.tot.count; V.:,Q
import tot.db.DBUtils; )!27=R/
import java.sql.*; !6=s{V&r1
/** "<0 !S~]
* +h"i6`g
* @author "qq$i35x
*/ T+Re1sPr?
public class CountControl{ Oh1U=V2~
private static long lastExecuteTime=0;//上次更新时间 ]7_>l>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Hj>9 #>b
/** Creates a new instance of CountThread */ M}o.= Iqa
public CountControl() {} TNqL ')f
public synchronized void executeUpdate(){ 4j3_OUwWZx
Connection conn=null; ivgX o'=
PreparedStatement ps=null; ;xiN<f4B
try{ )8oyo~4?
conn = DBUtils.getConnection(); |iUF3s|?
conn.setAutoCommit(false); 9ia&/BT7"z
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J.XkdGQ
for(int i=0;i<CountCache.list.size();i++){ ks.p)F>]
CountBean cb=(CountBean)CountCache.list.getFirst(); _m?i$5
CountCache.list.removeFirst(); .\oW@2,RA9
ps.setInt(1, cb.getCountId()); V]--d33/a
ps.executeUpdate();⑴ \2 DED
//ps.addBatch();⑵ Ne+Rs+~4
} #d % v=.1
//int [] counts = ps.executeBatch();⑶ OE(y$+L3_I
conn.commit(); ?VotIruR
}catch(Exception e){ /E<Q_/'Z
e.printStackTrace(); 9e`};DE
} finally{ ,]0BmlD
try{ .)tQ&2
if(ps!=null) { xMk>r1Ud
ps.clearParameters(); c\ZI
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ps.close(); X[?fU&
ps=null; }Y7P2W+4?
} _qPKdGoM
}catch(SQLException e){} ]zj#X\
DBUtils.closeConnection(conn); 7fypUQ:y
} IrYj#,xJ
} &I-:=ir
public long getLast(){ q0%QMut%
return lastExecuteTime; Pxf>=kY
} >6Pe~J5,:
public void run(){ EgG3XhfS
long now = System.currentTimeMillis(); VvIUAn
if ((now - lastExecuteTime) > executeSep) { _"p(/H
//System.out.print("lastExecuteTime:"+lastExecuteTime); q(~jP0pj%
//System.out.print(" now:"+now+"\n"); /F.<Gz;w
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ROTKK8:+:
lastExecuteTime=now; l\L71|3" g
executeUpdate(); 0@?m"|G
} iuWUr?`\
else{ cRKLyb
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 8OOAPp$%|
} s2,6aW C
} D6lzcf
} vWmt<E|e
//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 K@n-#
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类写好了,下面是在JSP中如下调用。 ep3VJ"^
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<% ]/h$6mrL
CountBean cb=new CountBean(); '['%b
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^(
CountCache.add(cb); $'CS/U`E}
out.print(CountCache.list.size()+"<br>"); r
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CountControl c=new CountControl(); <=|^\r
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c.run(); 8cZ[Kl%
out.print(CountCache.list.size()+"<br>"); FP&Ykx~
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