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: etw.l~y
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CountBean.java LI~ofCp
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/* =`st1K
* CountData.java ;bYS#Bid{V
* qQN|\u+co
* Created on 2007年1月1日, 下午4:44 %m/W4Nk
* FH3^@@Y%
* To change this template, choose Tools | Options and locate the template under t GS>f>i
* the Source Creation and Management node. Right-click the template and choose t/$:g9V%FA
* Open. You can then make changes to the template in the Source Editor. s2Rg-:7
*/ g$/C-j4A[
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package com.tot.count; Qxb%P<`u
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/** 3*(w=;y
* pLdZB9oD]C
* @author 9M12|X\]8
*/ ~7 w"$H8
public class CountBean { kO3N.t@n
private String countType; x&
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int countId; X;/5Niv32q
/** Creates a new instance of CountData */ e0Jz|?d=
public CountBean() {} E\Qm09Dj`<
public void setCountType(String countTypes){ qrr[QEFW
this.countType=countTypes; [z[<onFIq
} /LK,:6
public void setCountId(int countIds){ F`Ld
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this.countId=countIds; D$?}M>
} [ !<
public String getCountType(){ 9 $&$Fe
return countType; -bP_jIZF;g
} b'O>qQ
public int getCountId(){ OF1fS\P<>
return countId; af-
} a(#aEbN?d
} x=I|O;"><
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CountCache.java CT0 ~
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/* +tCNJ<S@l$
* CountCache.java OD8{
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* 1@Gmzh
* Created on 2007年1月1日, 下午5:01 dCn'IM1
* *Y]()#?Gr
* To change this template, choose Tools | Options and locate the template under 0ZAT;ea B
* the Source Creation and Management node. Right-click the template and choose <=Z`]8
* Open. You can then make changes to the template in the Source Editor. Jfs_9g5
*/ I xk+y?
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package com.tot.count; o+0x1Ct3P
import java.util.*; (#Ku`
/** $8{v_2C){
* ^q}cy1"j"
* @author zgn~UC6&
*/ oMeIXb)z
public class CountCache { Oz1S*<]=,~
public static LinkedList list=new LinkedList(); FzzV%
/** Creates a new instance of CountCache */ gp(: o$
public CountCache() {} f&2f8@
public static void add(CountBean cb){ /H'F4->
if(cb!=null){ [bh8Nj\E
list.add(cb); igO,Ge8}
} ZnNl3MKV
} 1m4Xl%KS>
} t3 rQ5m
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CountControl.java <$@*'i^7Ez
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/* 7^FJ+gN8b
* CountThread.java !v\_<8
* }UzRFIcv
* Created on 2007年1月1日, 下午4:57 w!--K9
* :406Oa
* To change this template, choose Tools | Options and locate the template under W lHK
* the Source Creation and Management node. Right-click the template and choose X:kr$
* Open. You can then make changes to the template in the Source Editor. &|YJ?},
*/ Bm$(4
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package com.tot.count; *LOUf7`
import tot.db.DBUtils; 1+ib(MJ<:#
import java.sql.*; hM "6-60
/** R>;m6Rb_
* AD>X'J
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* @author J.Fy0W@+k4
*/ [4
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public class CountControl{ $2/v8
private static long lastExecuteTime=0;//上次更新时间 ,LodP%%UV
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 U9(p ^
/** Creates a new instance of CountThread */ Hw1:zro
public CountControl() {} y*<x@i+h
public synchronized void executeUpdate(){ vAcxca">S
Connection conn=null; ]AB'POa
PreparedStatement ps=null; rHpxk
try{ (RU\a]Ry
conn = DBUtils.getConnection(); fP8iz `n
conn.setAutoCommit(false); rv <_'yj
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =berCV
for(int i=0;i<CountCache.list.size();i++){ ^-2|T__
CountBean cb=(CountBean)CountCache.list.getFirst(); M]7>Ar'zsG
CountCache.list.removeFirst(); jBMGm"NE
ps.setInt(1, cb.getCountId()); 3R&
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ps.executeUpdate();⑴ @;t6Slc"~
//ps.addBatch();⑵ [ f;o3
} I[w;soI
//int [] counts = ps.executeBatch();⑶ =;(y5c
conn.commit(); o"j$*o=
}catch(Exception e){ bmQ-5SE
e.printStackTrace(); ~-2Gx
HO`
} finally{ 4GqwY"ja
try{ ?:DUsg
if(ps!=null) { %4,v2K
ps.clearParameters(); #5X535'ze
ps.close(); )%wNVW 0C
ps=null; 2+=:pc^
} %EEQ^lm
}catch(SQLException e){} ZG$PW<73~
DBUtils.closeConnection(conn); wCgi@\
} {'a|$u+
} {$QkerW3
public long getLast(){ FH)_L1n
return lastExecuteTime; >K n7A
} &>A<{J@VL
public void run(){ )>;V72
long now = System.currentTimeMillis(); 952l1c!
if ((now - lastExecuteTime) > executeSep) { #?C.%kD
//System.out.print("lastExecuteTime:"+lastExecuteTime); 2y5d
//System.out.print(" now:"+now+"\n"); mX5%6{],
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ;~-M$a
}4
lastExecuteTime=now; tA8O(9OV
executeUpdate(); Xe2Zf
} )skz_a}]8
else{ enT[#f[{
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); b'%)?{E
} I7XJPc4}
} ?egZkg=U
} ?/q\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 4o|<zn
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类写好了,下面是在JSP中如下调用。 d1';d6.u\
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<% /m|U2rrqb
CountBean cb=new CountBean(); 7S2"e[-x
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); T# .pi@PF>
CountCache.add(cb); Ajm4q_
out.print(CountCache.list.size()+"<br>"); 'E"W;#%
CountControl c=new CountControl(); :nS$cC0x*
c.run(); j;BlpRD}
out.print(CountCache.list.size()+"<br>"); \l1==,wk
%>