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: G@ XKE17
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CountBean.java k/?5Fs!#
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/* a1_7plg
* CountData.java OW\r }
* gh|TlvnA
* Created on 2007年1月1日, 下午4:44 3G
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* WrQe'ny
* To change this template, choose Tools | Options and locate the template under fa;\4#
* the Source Creation and Management node. Right-click the template and choose t{|
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* Open. You can then make changes to the template in the Source Editor. 7/w)^&8
*/ c=K
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package com.tot.count; MJd!J]E6
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/** J1T_wA_
* oQ1>*[e<u
* @author KyK%2:
*/ ^+^#KC8]W
public class CountBean { anjU3j
private String countType; !jGe_xB}~
int countId; ,&rlt+wE
/** Creates a new instance of CountData */ ;"$Wfy
public CountBean() {} BMkN68q
public void setCountType(String countTypes){ Va"Q1 *"
this.countType=countTypes; 9aFu51
} +]
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public void setCountId(int countIds){ 8e:J{EG~
this.countId=countIds; 3,=97Si=
} /-)\$T1d
public String getCountType(){ *JDQaWzBd
return countType; P3UU~w+s
} f^b.~jXSR}
public int getCountId(){ z'Atw"kA
return countId; NKd}g
} I !=ew |
} '/%]B@!
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CountCache.java 4t]ccqX*{
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/* w{l}(:xPp
* CountCache.java |*ss`W7F,2
*
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* Created on 2007年1月1日, 下午5:01 3DRJl,v
* AI0YK"c?
* To change this template, choose Tools | Options and locate the template under hkB/
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* the Source Creation and Management node. Right-click the template and choose ~(OG3`W!
* Open. You can then make changes to the template in the Source Editor. {Z0(V"Q
*/ #d2XVpO[0
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package com.tot.count; ^)oBa=jL4
import java.util.*; Cp4 U`]
/** ix2V?\
* *;cvG?V
* @author :}'5'oVG
*/ vqO d`_)
public class CountCache { KT$Za
public static LinkedList list=new LinkedList(); R8LJC]6Bh
/** Creates a new instance of CountCache */ ovm109fTx
public CountCache() {} fUj[E0yOF
public static void add(CountBean cb){ dt&m YSZ}
if(cb!=null){ n-zAkKM
list.add(cb); T% 74JRQ
} ]!CMo+
} O(x1Ja,&
} ;Z^\$v9?
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CountControl.java )E9[=4+*C$
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/* prtNfwJz1j
* CountThread.java m31l[e
* O|%03q(
* Created on 2007年1月1日, 下午4:57 |H-%F?<{
* a',6WugIP
* To change this template, choose Tools | Options and locate the template under OlRtVp1
* the Source Creation and Management node. Right-click the template and choose !r\u,l^
* Open. You can then make changes to the template in the Source Editor. o%3i(H
*/ >7g #e,d
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package com.tot.count; 6mp8v`b
import tot.db.DBUtils; c8z6-6`i0
import java.sql.*; \LuaI
/** \f~m6j$D_
* bu0i#
* @author 3(&k4
*/ 0O>T{<
public class CountControl{ U]/iPG&_
private static long lastExecuteTime=0;//上次更新时间 "x1?T+j4
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Me;XG?`
/** Creates a new instance of CountThread */ 75v7w
public CountControl() {} N+lhztYQ?
public synchronized void executeUpdate(){ eX`wQoV%
Connection conn=null; gq%U5J"x;J
PreparedStatement ps=null; ?D>%+rK8c
try{ qwhDv+o
conn = DBUtils.getConnection(); >EE}P|=-
conn.setAutoCommit(false); R+sv? 4k
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); p1F{ v^
for(int i=0;i<CountCache.list.size();i++){ z)%Ke~)<\@
CountBean cb=(CountBean)CountCache.list.getFirst(); S\76`Ot
CountCache.list.removeFirst(); u~rPqBT{d3
ps.setInt(1, cb.getCountId()); <JUumrEo
ps.executeUpdate();⑴ c,>y1%V*S{
//ps.addBatch();⑵ 8*zORz
} fQm3D%
//int [] counts = ps.executeBatch();⑶ B*Z}=$1j
conn.commit(); osM[Xv
}catch(Exception e){ &=f] a
e.printStackTrace(); ,FIG5-e,}
} finally{ xAwP
try{ af@R\"N9c
if(ps!=null) { ZR]p7{8B
ps.clearParameters(); -HwqR Ys
ps.close(); y^0
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ps=null; +MR]h
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} xig4H7V
}catch(SQLException e){} q$7w?(Lk
DBUtils.closeConnection(conn); V36u%zdX5n
} o[I
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} i/{dD"HwM
public long getLast(){ xs
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return lastExecuteTime; B_DyH
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} E]w2
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public void run(){ ?_-5W9
long now = System.currentTimeMillis(); sA~Ijg"6
if ((now - lastExecuteTime) > executeSep) { r S>@>8k2,
//System.out.print("lastExecuteTime:"+lastExecuteTime); G^ShN45
//System.out.print(" now:"+now+"\n"); :3N6Ej
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); VwN=AFk
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lastExecuteTime=now; Tuz~T
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executeUpdate(); f_|pl^
} h3e
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else{ Z-j?N{3&
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); fQU5' wGp
} cb=ixn
} %E8HLTEvl
} ~@#s<a,%;
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 j'x@P+A
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类写好了,下面是在JSP中如下调用。 I*z|_}$
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<% ?
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CountBean cb=new CountBean(); `3eQ#, G!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); #.<Dq8u
CountCache.add(cb); }wB!Bx2
out.print(CountCache.list.size()+"<br>"); \zh`z/=92
CountControl c=new CountControl(); :]JMsa6
c.run(); Ts\PZQ!q
out.print(CountCache.list.size()+"<br>"); vs^)=
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