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: o:
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CountBean.java O~x{p,s
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/* i??+5o@uTF
* CountData.java EBQ_c@
* c5O8,sT
* Created on 2007年1月1日, 下午4:44 kXUJlLod
* F*Yx1vj
* To change this template, choose Tools | Options and locate the template under s+G(N$0U
* the Source Creation and Management node. Right-click the template and choose {`J!DFfur
* Open. You can then make changes to the template in the Source Editor. ZGCp[2$
*/ oq1wU@n
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package com.tot.count; &f?JtpB
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/** rfSEL
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* 29|nt1Z
* @author L/vw7XNrX
*/ N#R8ez`
public class CountBean { GU Mf}y
private String countType; 9]tW; ?
int countId; M.)z;[3O
/** Creates a new instance of CountData */ $~
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public CountBean() {} ]<q!pE;t
public void setCountType(String countTypes){ CR#-!_=4
this.countType=countTypes; Z7e"4wA
} ~HtD]|7
public void setCountId(int countIds){ Olt;^>MQ
this.countId=countIds; j{=}?+M
} 7.n\a@I/
public String getCountType(){ w&]$!g4
return countType; `7V1 F.\
} >^<;;8Xh
public int getCountId(){ i-dosY`81
return countId; ~52'iI)Mw
} >:FmAey
} L"jjD:
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CountCache.java s(L!]d.S$y
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/* c5i7mx:.
* CountCache.java #X'su`+
* 3qV\XC+
* Created on 2007年1月1日, 下午5:01 Z*NTF:6c
* 9uX15a
* To change this template, choose Tools | Options and locate the template under ]A l)>
* the Source Creation and Management node. Right-click the template and choose |B^Picu
* Open. You can then make changes to the template in the Source Editor. ke/4l?zs
*/ 4)L};B=
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package com.tot.count; FS('*w&bP
import java.util.*; <5ULu(b&$
/** 7v.O Lp
* evVxzU&
* @author ~Q]::
*/ 9c{ ~$zJW
public class CountCache { o{mVXidE
public static LinkedList list=new LinkedList(); #D>:'ezm
/** Creates a new instance of CountCache */ FZ8Qj8
public CountCache() {} F6h IG G
public static void add(CountBean cb){ [w+1<ou;j
if(cb!=null){ u{l4O1k/c
list.add(cb); UCTc$3
} 1$m{)Io2(
} 2)
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} c<Q*g
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CountControl.java E2S#REB4
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/* cVmF'g
* CountThread.java I0^oaccM
* u:wijkx
* Created on 2007年1月1日, 下午4:57
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* sY]pszjT
* To change this template, choose Tools | Options and locate the template under [~n|R Oo
* the Source Creation and Management node. Right-click the template and choose Sj8fo^K50
* Open. You can then make changes to the template in the Source Editor. aan(69=jz
*/ p}X *HJq$
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package com.tot.count; jz\>VYi(7
import tot.db.DBUtils; 6hXh;-U
import java.sql.*; 6_g6e2F
/** {e., $'#
* `sd
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* @author V*@&<x"E
*/ ZHj7^y@P
public class CountControl{ 2xBh
private static long lastExecuteTime=0;//上次更新时间 7p{uRSE4._
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 OO,%zwgt
/** Creates a new instance of CountThread */ #Ny+6XM
public CountControl() {} 2mO9
public synchronized void executeUpdate(){ '3E25BsL
Connection conn=null; ?dCJv_w
PreparedStatement ps=null; ~BnmAv$m[
try{ W3R43>$
conn = DBUtils.getConnection(); 'RV wxd
conn.setAutoCommit(false); A43[i@o
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Kc>Rd
for(int i=0;i<CountCache.list.size();i++){
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CountBean cb=(CountBean)CountCache.list.getFirst(); {L M Q
CountCache.list.removeFirst(); /}5)[9GC
ps.setInt(1, cb.getCountId()); Q}g"pl
ps.executeUpdate();⑴ ]^@m $O
//ps.addBatch();⑵ PevT`\>
} MOuEsm;
//int [] counts = ps.executeBatch();⑶ O8LIKD_I[
conn.commit(); D8$4P T0u
}catch(Exception e){ $?pfst~;O
e.printStackTrace(); ykGA.wo7/P
} finally{ Ffd;aZ4n
try{ ]XYD2fR2qA
if(ps!=null) { Emk:@$3{r
ps.clearParameters(); w`zS`+4
ps.close(); UyDq`@h
ps=null; aHNn!9#1
} koj*3@\p/
}catch(SQLException e){} g12.4+
DBUtils.closeConnection(conn); fA ),^
} /\E3p6\*
} nD=N MqQ &
public long getLast(){ =%b1EYk
return lastExecuteTime; .j"@7#tW
} u|Ng>lU
public void run(){ ~cfvL*~5
long now = System.currentTimeMillis(); \GGyz{i
if ((now - lastExecuteTime) > executeSep) { W!* P
//System.out.print("lastExecuteTime:"+lastExecuteTime); ;9vY5CxzC
//System.out.print(" now:"+now+"\n"); i3$pqNe
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); @CC
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lastExecuteTime=now; QS-X_
executeUpdate(); RgzzbW
} e
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else{ YH{n
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ?rdWhF]
} %+C6#cj
} pM*(
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} iN5[x{^t
//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 uME_/S uO
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类写好了,下面是在JSP中如下调用。 LvL2[xh%&
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<% lKS 2OOYC`
CountBean cb=new CountBean(); : T qeVf
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); X*&Thmee
CountCache.add(cb); 9]I{GyH
out.print(CountCache.list.size()+"<br>"); mCQ:<#
CountControl c=new CountControl(); ~/2OK!M
c.run(); B}N1}i+
out.print(CountCache.list.size()+"<br>"); r(zn1;zl
%>