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: 4C:-1gu7
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CountBean.java |; [XZ ZZ
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/*
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* CountData.java {4]sJT
* wmV7g7t6
* Created on 2007年1月1日, 下午4:44 O~P1d&:L
* xxy
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* To change this template, choose Tools | Options and locate the template under b?^CnMO
* the Source Creation and Management node. Right-click the template and choose U~CG(9
* Open. You can then make changes to the template in the Source Editor. WNnB
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*/ b;;mhu[D
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package com.tot.count; EN2H[i+,
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/** o|en"?4
* 2|a5xTzH
* @author #3~hF)u&/
*/ Yq~$pVgf
public class CountBean { Qxb%P<`u
private String countType; f[ 'uka.U
int countId; `/"*_AKAI
/** Creates a new instance of CountData */ 57|RE5]|!
public CountBean() {} 1ze\ U>
public void setCountType(String countTypes){ @LyCP4
this.countType=countTypes; BT *z^ZH
} WY& [%r
public void setCountId(int countIds){ V|\dnVQ'-%
this.countId=countIds; ZbAg^2
} (/i?Fd
public String getCountType(){ ?+P D?c7
return countType; 0PP5qeqN2n
} ~fF_]UVq3
public int getCountId(){ c3__=$)'kP
return countId; zk++#rB
} Hd_W5R
} j1~'[
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CountCache.java R3bHX%T
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/* (O!Q[WLS
* CountCache.java dje}CbZ
* \+#>XDD
* Created on 2007年1月1日, 下午5:01 (5/>arDn
* xJ rKH
* To change this template, choose Tools | Options and locate the template under }!_ofe
* the Source Creation and Management node. Right-click the template and choose %G`GdG}T
* Open. You can then make changes to the template in the Source Editor. ^'G,sZ6'Nh
*/ Vi*HG &DD
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package com.tot.count; =O
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import java.util.*; 7[I%UP
/** '$0~PH&
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* @author /idrbc
*/ *Dhy a g
public class CountCache { o+0x1Ct3P
public static LinkedList list=new LinkedList(); (#Ku`
/** Creates a new instance of CountCache */ $8{v_2C){
public CountCache() {} y[A%EMd
public static void add(CountBean cb){
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if(cb!=null){ o6ag{Yp
list.add(cb); #a+*u?jnnL
} MhL>6rn
} (:r80:
} "CTK%be{q/
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CountControl.java xH4Qv[k
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/* L ]Y6/Q
* CountThread.java Z=.$mFE\
* yt[vd8O'c
* Created on 2007年1月1日, 下午4:57 e.'6q
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* !mIr_d2"
* To change this template, choose Tools | Options and locate the template under 7^FJ+gN8b
* the Source Creation and Management node. Right-click the template and choose !v\_<8
* Open. You can then make changes to the template in the Source Editor. ),rd7GB>
*/ RQO&F$R=
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package com.tot.count; P*:9u>
import tot.db.DBUtils; `G_k~ %
import java.sql.*; ;_6CV
/** u`
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* Iw[7;B5v
* @author HP(dhsd<c
*/ [k{2)g
public class CountControl{ b^^ .$Gu
private static long lastExecuteTime=0;//上次更新时间 Q:^.Qs"IK
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 oD.[T)G?
/** Creates a new instance of CountThread */ ~\khwNA
public CountControl() {} O.z\
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public synchronized void executeUpdate(){ dxi5p!^^9
Connection conn=null; )aAKxC7w
PreparedStatement ps=null;
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try{ U+ANSW/
conn = DBUtils.getConnection(); .^!<cFkCE
conn.setAutoCommit(false); TsF>Y""*M
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); UfSqiu
for(int i=0;i<CountCache.list.size();i++){ =-%10lOI
CountBean cb=(CountBean)CountCache.list.getFirst(); PD$'
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CountCache.list.removeFirst(); z,K;GZuP
ps.setInt(1, cb.getCountId()); =berCV
ps.executeUpdate();⑴ ^-2|T__
//ps.addBatch();⑵ M]7>Ar'zsG
} %U?1Gf e
//int [] counts = ps.executeBatch();⑶ G7NRpr
conn.commit(); q+{$"s9v
}catch(Exception e){ B&rw R/d
e.printStackTrace(); YT~h1<se
} finally{ $!v:@vNMs
try{ 11YpC;[o
if(ps!=null) { eufGU)M
ps.clearParameters(); g:eqB&&
ps.close(); ^\Epz*cL
ps=null; e1/{bX5
} 9/#?]LJ
}catch(SQLException e){} Xy]Pmt
DBUtils.closeConnection(conn); yvIzgwN%s!
} P$#{a2
} SX]uIkw
public long getLast(){ 5j~1%~,#
return lastExecuteTime; ,X}Jpi;/
} wAKm]?zB>
public void run(){ QWI)Y:<K/
long now = System.currentTimeMillis(); &w%--!T
if ((now - lastExecuteTime) > executeSep) { i_f\dkol
//System.out.print("lastExecuteTime:"+lastExecuteTime); M2!2J
//System.out.print(" now:"+now+"\n"); Fk#$@^c@
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 4Kh0evZ
lastExecuteTime=now; bPA >xAH
executeUpdate(); 2bu > j1h
} SLU$DW;t
else{ @hwe
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Xv<K>i>k
} ''Hx&
} v3b+Ddp
} bbs'>D3
//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 Ctx`b[&KXX
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类写好了,下面是在JSP中如下调用。 } fJLY\
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<% G|b
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CountBean cb=new CountBean(); B}+li1k
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); n7/>+V+
CountCache.add(cb); x|$|~6f=n
out.print(CountCache.list.size()+"<br>"); {s>V'+H(F
CountControl c=new CountControl(); gy Ey=@L
c.run(); ha?M[Vyw4Q
out.print(CountCache.list.size()+"<br>"); +_1sFH`
%>