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.
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CountBean.java hS(}<B{x!
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/* :2^j/
* CountData.java 6yZ!K
* mhTi{t_fHM
* Created on 2007年1月1日, 下午4:44 .[YM0dt
* .KH3.v/c|
* To change this template, choose Tools | Options and locate the template under P")duv
* the Source Creation and Management node. Right-click the template and choose %^1@c f?.
* Open. You can then make changes to the template in the Source Editor. (<y~]ig y
*/ \Eqxmo
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package com.tot.count; b|_Pt
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/** Z1u:OI@(
* h,QC#Ak o
* @author *2wFLh
*/ o\ss
public class CountBean { s'/b&Idf8
private String countType; #bk[Zj&
int countId; k4WUfL d
/** Creates a new instance of CountData */ L{XNOf3
public CountBean() {} rO#WG}E<"
public void setCountType(String countTypes){ ="X2AuK%1$
this.countType=countTypes; Z*,Nt6;e
} mWhQds6
public void setCountId(int countIds){ 'L$%)`;e
this.countId=countIds; GZt+(q
} \jlem <&
public String getCountType(){ E"8cB]`|8
return countType; H<6TN^
} )<Cf,R
public int getCountId(){ xz9xt
return countId; yMz%s=rh
} f;";P
} 2|Of$oMc
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CountCache.java UvwO/A\Gv
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/* ZcT%H*Ib]9
* CountCache.java jV:Krk6T<
* c-1Hxd YD
* Created on 2007年1月1日, 下午5:01 ~CTe5PX c
* /F/zMZGSA{
* To change this template, choose Tools | Options and locate the template under V)HX+D>
* the Source Creation and Management node. Right-click the template and choose P[E:=p
* Open. You can then make changes to the template in the Source Editor. frsqnvm;+
*/ mBb;:-5
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package com.tot.count; Q:U^):~
import java.util.*; w0`aW6t#
/** _T[7N|'O
* a g=,oYn
* @author G.ag$KF
*/ 0[ (Z48
public class CountCache { 1^F
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public static LinkedList list=new LinkedList(); LI`L!6^l
/** Creates a new instance of CountCache */ x}acxu 2H7
public CountCache() {} }ZPO^4H;-
public static void add(CountBean cb){ HfQZRDH
if(cb!=null){ /HlLfW
list.add(cb); &35 6
} ?_hKhn%K9
} )83UF
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} <m") 2dJ
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CountControl.java }cl~Vo-mp
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/* 8 K7.; t1
* CountThread.java km%c0:
* 2;!,:bFb
* Created on 2007年1月1日, 下午4:57 k`#OXLR
* k)'y;{IN
* To change this template, choose Tools | Options and locate the template under G{wIY" ~4
* the Source Creation and Management node. Right-click the template and choose 960[.99
* Open. You can then make changes to the template in the Source Editor. ar+ j`QIe
*/ 8xAxn+;
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package com.tot.count; ;"d>lyL
import tot.db.DBUtils; O7]p `Xi8
import java.sql.*; |@Cx%aEKU
/** zk#NM"C+
* ~ 9F
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* @author |$hBYw
*/ k/U1
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public class CountControl{ WAd5,RZ?
private static long lastExecuteTime=0;//上次更新时间 Ib8*rL0p<L
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 {=Z xF
/** Creates a new instance of CountThread */ >v
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public CountControl() {} 2N)siH
public synchronized void executeUpdate(){ Rw
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Connection conn=null; tWT,U[
PreparedStatement ps=null; mgODJ
try{ P@LFX[HtM
conn = DBUtils.getConnection(); &?(<6v7
conn.setAutoCommit(false); !z EW)
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 9FGe(t<
for(int i=0;i<CountCache.list.size();i++){ *wvd[q h
CountBean cb=(CountBean)CountCache.list.getFirst(); *9XKkR<r
CountCache.list.removeFirst(); MKl`9 Y3Ge
ps.setInt(1, cb.getCountId()); o#p{0y
ps.executeUpdate();⑴ [i"6\p&
//ps.addBatch();⑵ #o>~@.S#:0
} c8@zpkMj/
//int [] counts = ps.executeBatch();⑶ E:_m6
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conn.commit(); D'Fj"&LK
}catch(Exception e){ qdss(LZ
e.printStackTrace(); O)2==_f\
} finally{ ?2RDd|#
try{ G}|!Jdr
if(ps!=null) { As5*)o"&
ps.clearParameters(); "UNWbsn6Qr
ps.close(); C[4{\3\Va
ps=null; *h <_gn
} -VC
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}catch(SQLException e){} -l:4I6-hi
DBUtils.closeConnection(conn); _S$SL%;\
} xJ&E2Bf
} PUU
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public long getLast(){ QsO%m
return lastExecuteTime; \/wbk`2
} sxP1.= W
public void run(){ vO?\u`vY
long now = System.currentTimeMillis(); }|KNw*h$
if ((now - lastExecuteTime) > executeSep) { @zQ.d{
//System.out.print("lastExecuteTime:"+lastExecuteTime); d ynq)lf
//System.out.print(" now:"+now+"\n"); 5{PT
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); /i[1$/*
lastExecuteTime=now; b6]MJ0do
executeUpdate(); NZ|(#` X
} bXiOf#:''
else{ k}0Y&cT!rU
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3QD+&9{D
} qcmf*Yl:v
} [.
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} 6d# 7
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 =ws iC'
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类写好了,下面是在JSP中如下调用。 _l ,_NV&T
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<% Ifx
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CountBean cb=new CountBean(); t.s;dlx[@
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); 8@)4)+e
out.print(CountCache.list.size()+"<br>"); QEC4!$L^
CountControl c=new CountControl(); S;I>W&U
c.run(); -ff@W m
out.print(CountCache.list.size()+"<br>"); ><HHO
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