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: ,MD>Jx|
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CountBean.java s_6Iz^]I
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/* %i&\X[
* CountData.java P}-S[[b73s
* :Y)G- :S+
* Created on 2007年1月1日, 下午4:44 3;Tsjv}
* UDb
* To change this template, choose Tools | Options and locate the template under V}Pv}j:;
* the Source Creation and Management node. Right-click the template and choose Rz33_ qA
* Open. You can then make changes to the template in the Source Editor. Fh.ZsPn,m
*/ `>`{DEDx{5
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package com.tot.count; &y ~GTEP
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/** ZMch2 U8
* 3UJSK+d\
* @author ak(P<OC-
*/ D+*_iM6[-
public class CountBean { N0fmC*1-
private String countType; 6!RKZj)
int countId; 8HdjZ!
/** Creates a new instance of CountData */ ,m)YL>k
public CountBean() {} ~uJO6C6A
public void setCountType(String countTypes){ i\\,Z
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this.countType=countTypes; MUp{2_RA
} /fxv^C82yv
public void setCountId(int countIds){ -yY]0
this.countId=countIds; ))uki*UNK
} 1@`mpm#Y
public String getCountType(){ $PTl{
return countType; 0f,Ii_k bT
} <:~'s]`zf
public int getCountId(){ d'p@[1/
return countId; *)i+ c{~
} HE3x0H}o>
} BR0P :h
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CountCache.java TzsNhrU{
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/* Yd<q4VJR
* CountCache.java HuajdC~
* 1!2,K ot
* Created on 2007年1月1日, 下午5:01 mQ:5(]v
* T?8N$J
* To change this template, choose Tools | Options and locate the template under tVAH\*a,/
* the Source Creation and Management node. Right-click the template and choose wU5= '
* Open. You can then make changes to the template in the Source Editor. QBTjiaYGa'
*/ K<"Y4O#]
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package com.tot.count; :4S~}}N
import java.util.*; CSIsi]H
/** !,;/JxfgVh
* .4,l0Nn`W
* @author 3d>xg%?
*/ S{)'1J_0
public class CountCache { (s!cd]Qa.
public static LinkedList list=new LinkedList(); )}T0SGY
/** Creates a new instance of CountCache */
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public CountCache() {} *AI?md
public static void add(CountBean cb){ yv.(Oy
if(cb!=null){ hkR Jqta)
list.add(cb); qISzn04
} /PtmJ2[
} RQd5Q.
} 8,&QY%8pX
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CountControl.java r!O4]j_3
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/* m*H6\on:
* CountThread.java Y1U\VU
* 5\P3JoH:Yg
* Created on 2007年1月1日, 下午4:57 7D wf0Re`
* H%`|yUE(
* To change this template, choose Tools | Options and locate the template under tU(vt0~b
* the Source Creation and Management node. Right-click the template and choose Z)H9D(Za
* Open. You can then make changes to the template in the Source Editor. /?
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*/ xouy|Nn'
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package com.tot.count; \J3n[6;
import tot.db.DBUtils; he1W22
import java.sql.*; rQD7ZN_ R
/** %^66(n)
* dnUiNs8
* @author P*sb@y>}O
*/ Xu#K<#V
public class CountControl{ 4|DGQ
private static long lastExecuteTime=0;//上次更新时间 iWu^m+"k
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 !)TO2?,^
/** Creates a new instance of CountThread */ }@S''AA\
public CountControl() {} 5Rec~&v
public synchronized void executeUpdate(){ f1UGDC<p9
Connection conn=null; [P?.(*
PreparedStatement ps=null; >J
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try{ a#:K"Mf.
conn = DBUtils.getConnection(); ;NeN2 |I]
conn.setAutoCommit(false); ![#>{Q4i
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); pUXszPf
for(int i=0;i<CountCache.list.size();i++){ I4"U/iL51
CountBean cb=(CountBean)CountCache.list.getFirst(); orzy&4
CountCache.list.removeFirst(); p6e9mSs
ps.setInt(1, cb.getCountId()); U:o(%dk
ps.executeUpdate();⑴ L=."<,\
//ps.addBatch();⑵ $*[-kIy
} >,. x'{
//int [] counts = ps.executeBatch();⑶ 2Sg,b8
conn.commit(); wth*H$iF
}catch(Exception e){ -v7O*xm"
e.printStackTrace(); {]CO;5:
} finally{ EzDQoN7Em
try{ V[N4 {c
if(ps!=null) { q-)Ynp4'
ps.clearParameters(); \a}W{e=FNT
ps.close(); 51lN,VVD
ps=null; P1f@?R&t+
} H%AC *,
}catch(SQLException e){} >k{KwFB^S
DBUtils.closeConnection(conn); e+=P)Zp/
} ^6U0n!nU
} M8wEy_XB1
public long getLast(){ gr
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return lastExecuteTime; ;3H#8x-
} p +>vX
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public void run(){ zgh~P^Z
long now = System.currentTimeMillis(); K9(Su`zr
if ((now - lastExecuteTime) > executeSep) { ^sA"&Vdr^
//System.out.print("lastExecuteTime:"+lastExecuteTime); R8<'m
//System.out.print(" now:"+now+"\n"); f~NGIlgR
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); p:n.:GZ=y
lastExecuteTime=now; EsR$H2"
executeUpdate(); '6&a8&:
} 9s}y*Vp
else{ B Ctm05
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Y]R;>E5o|
}
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} z1u1%FwOfM
} n!K<g.tjW
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 {v>orP?
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类写好了,下面是在JSP中如下调用。 YzD6S*wb
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<% Q7-d]xJ^
CountBean cb=new CountBean(); x.OCE`
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); t$W~X~//
CountCache.add(cb); R%Y#vUmBV{
out.print(CountCache.list.size()+"<br>"); O$Z<R:vVA
CountControl c=new CountControl(); (?7=$z!h
c.run(); M(_1'2
out.print(CountCache.list.size()+"<br>"); }.j09[<
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