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: 0}i
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CountBean.java @[^ 3yC#
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/* ]5'*^rz ^
* CountData.java _c]}m3/
* ]TrJ*~
* Created on 2007年1月1日, 下午4:44 +wQ5m8E
* /E6)>y66
* To change this template, choose Tools | Options and locate the template under A+/Lt>+AS
* the Source Creation and Management node. Right-click the template and choose Q4mtfpiDx
* Open. You can then make changes to the template in the Source Editor. xM_#FxJb
*/ %`~4rf"7
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package com.tot.count; \KV.lG!
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/** -l=C7e
* HG7Qdw2+O
* @author +C=vuR
*/ I]ej ]46K
public class CountBean { L`t786
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private String countType; )QAYjW!Z
int countId; zfU Do`V~
/** Creates a new instance of CountData */ 4W>DW`{
public CountBean() {} LsR<r1KDJ
public void setCountType(String countTypes){ 2[w9#6ly
this.countType=countTypes; H [+'>Id:
} @;EQ{d
public void setCountId(int countIds){ uz8eS'8
this.countId=countIds; i?_Q@uA~<:
} mLq0;uGL|
public String getCountType(){ P~(&lu/;P
return countType; :$Cm]RZ
} !KV!Tkx h
public int getCountId(){ " lD -*e4
return countId; zZ}.2He8
} Wi$?k{C
} QmBHD;Gf
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CountCache.java 9ERdjS
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/* {Lju7'5L
* CountCache.java 3\2&?VAjR
* >(:3H+
* Created on 2007年1月1日, 下午5:01 55v=Ij?M
* TrDTay
* To change this template, choose Tools | Options and locate the template under IiKU=^~w
* the Source Creation and Management node. Right-click the template and choose .UxkTads
* Open. You can then make changes to the template in the Source Editor. H8HH) ^
*/ e\z,^
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package com.tot.count; |f}wOkl
import java.util.*; []OS p&
/** wgSFL6Ei
* T#E{d
* @author }r04*P(
*/ R1*&rjB
public class CountCache { 5!Er;e
public static LinkedList list=new LinkedList(); # l1*# Z
/** Creates a new instance of CountCache */ ",YNphjAn
public CountCache() {} qLBQ!>lR
public static void add(CountBean cb){ UXSwd#I&
if(cb!=null){ T c-fO
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list.add(cb); kU:Q&[/jzH
} jhT/}"v
} z%fjG} z
} i(rYc
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CountControl.java Jn(|.eT|
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/* El}~3|a?
* CountThread.java ]_ LAy
* h<IAHCz;(
* Created on 2007年1月1日, 下午4:57 j+.E#:tu"
* =>*}qen
* To change this template, choose Tools | Options and locate the template under _bh$
t
* the Source Creation and Management node. Right-click the template and choose >>=zkPy
* Open. You can then make changes to the template in the Source Editor. 25G~rklk
*/ axG%@5
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package com.tot.count; lyowH{.N"3
import tot.db.DBUtils; $1X!Ecq_
import java.sql.*; m[ S1
/** EhW@iYL
* }lk9|U#6*`
* @author pJ?y
*/ ]_>38f7h
public class CountControl{ >U:-U"rA?
private static long lastExecuteTime=0;//上次更新时间 ;{m;CKHI
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 sVO|Ghy65
/** Creates a new instance of CountThread */ +MS*YpPW
public CountControl() {} fN`Prs A
public synchronized void executeUpdate(){ -6q7ze{@
Connection conn=null; BT:b&"AR[
PreparedStatement ps=null; _J>Ik2EF
try{ :>y5'q@R
conn = DBUtils.getConnection(); dn5t7D^x
conn.setAutoCommit(false); p3%cb?G%w
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); V(G{_>>
for(int i=0;i<CountCache.list.size();i++){ Q{hK+z`D
CountBean cb=(CountBean)CountCache.list.getFirst(); &Ai+t2
CountCache.list.removeFirst(); 6_EfOD9
ps.setInt(1, cb.getCountId()); *E@as
ps.executeUpdate();⑴ _=w=!U&W
//ps.addBatch();⑵ CS^|="Zs
} a/d8_(0
//int [] counts = ps.executeBatch();⑶ nQw, /Lk
conn.commit(); ylmVmHmc
}catch(Exception e){ &WbHM)_n
e.printStackTrace(); UuJ gB)
} finally{ q!d7Ms{q
try{ ]VVx2ERs
if(ps!=null) { Lz-(1~o
ps.clearParameters(); 17rg!'+
ps.close(); <t *3w
ps=null; yWYsN
} 5N>L|J2
}catch(SQLException e){} 5t-(MY
DBUtils.closeConnection(conn); &I(3/u
} ?f6Fj
} P+p:Ed80
public long getLast(){ G!GGT?J
return lastExecuteTime; B3u:D"t
} ovtZHq/
public void run(){ cMUmJH
long now = System.currentTimeMillis(); P; =,Q$e8
if ((now - lastExecuteTime) > executeSep) { :JxuaM8
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5X`m.lhUc
//System.out.print(" now:"+now+"\n"); cTJG1'm
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^O5PcV 3Eg
lastExecuteTime=now; EU7mP
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executeUpdate(); r-}C !aF]
} }8'bXG+
else{ XQ k,xQ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); B?XqH_=0L
} BfvvJh_
} G{s
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} _'r&'s;<z
//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 xirZ.wj W
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类写好了,下面是在JSP中如下调用。 d_Y7/_i
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<% @}e5T/{X}T
CountBean cb=new CountBean(); 5,V3_p:)VI
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^^*dHWHn<
CountCache.add(cb); &C E){jC
out.print(CountCache.list.size()+"<br>"); 1`&"U[{
CountControl c=new CountControl(); %xwdH4_
c.run(); PwxRu
out.print(CountCache.list.size()+"<br>"); BG20R=p
%>