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: hR>`I0|p&
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CountBean.java 93.L887
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/* )Ps<u- V
* CountData.java $reQdN=~
* 0KZsWlD:L
* Created on 2007年1月1日, 下午4:44
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* ~a>3,v-
* To change this template, choose Tools | Options and locate the template under WK SWOSJ
* the Source Creation and Management node. Right-click the template and choose #KL W&A
* Open. You can then make changes to the template in the Source Editor. 5B{Eg?
*/ p:!FB8
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package com.tot.count;
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/** ?`SBGN;
* NA$ODK-
* @author :y!{=[>M(
*/ OH5#.${O
public class CountBean { y$|OE%S
private String countType; ;4vx+> -
int countId; 7ws[Rp8
/** Creates a new instance of CountData */ Z3 na .>Z
public CountBean() {} \FIOFbwe
public void setCountType(String countTypes){ fqm6Pd{:(
this.countType=countTypes; HxShNU
} WZ@$bf}f0
public void setCountId(int countIds){ |uA /72
this.countId=countIds; =co6.Il
} oPA m*
public String getCountType(){ kPp7;U2A
return countType; 3_Re>i
} p:4oA<V
public int getCountId(){ 3{-
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return countId; #|} EPD9$
} F)tcQO"G
} RM`iOV,Y
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CountCache.java OmECvL'Z
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/* H[iR8<rhQ
* CountCache.java j{NcDepLn
* vj<JjGP
* Created on 2007年1月1日, 下午5:01 <~.1>CI9D3
* 0a's[>-'A
* To change this template, choose Tools | Options and locate the template under 6.QzT(
* the Source Creation and Management node. Right-click the template and choose =&?BPhJE
* Open. You can then make changes to the template in the Source Editor. V)Y#m/$`
*/ h!]=)7x;
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package com.tot.count; (yhnv Z
import java.util.*; kCU(Hi`Q
/** CF@j]I@{
* 5+iXOs<
* @author ;XGO@*V5T
*/ )Es|EPCx!
public class CountCache { A>J,Bi
public static LinkedList list=new LinkedList(); 1ihdH1rg[
/** Creates a new instance of CountCache */ A#Jx6T`a
public CountCache() {} i~EFRI@
public static void add(CountBean cb){ X?OH//co
if(cb!=null){ 8A2 _4q@34
list.add(cb); Q)\4 .d
} wy4}CG
} _air'XQ&!
} 18gApRa
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CountControl.java Y`!Zk$8
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/* '@,M
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* CountThread.java _T.k/a
* y` 6!Vj l
* Created on 2007年1月1日, 下午4:57 K0]42K
*
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* To change this template, choose Tools | Options and locate the template under J'Y;j^
* the Source Creation and Management node. Right-click the template and choose S;I}:F#5
* Open. You can then make changes to the template in the Source Editor. ,FDRU
*/ qjmlwVw
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package com.tot.count; >K-S&Y
import tot.db.DBUtils; =/MA`>
import java.sql.*; gano>W0
/** 7Nt6}${=z
* D
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* @author 8a3h)R
*/ KetNFwbUf
public class CountControl{ g!DJW
private static long lastExecuteTime=0;//上次更新时间 @PAT|6
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 GX;~K
/** Creates a new instance of CountThread */ ~l"]J'jF"H
public CountControl() {} 5l4YYwd>v
public synchronized void executeUpdate(){ , IDCbJ
Connection conn=null; &Na,D7A:3I
PreparedStatement ps=null; OV,t|
try{
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conn = DBUtils.getConnection(); /l1OC(hm
conn.setAutoCommit(false); :.aMhyh#*
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ="J *v>
for(int i=0;i<CountCache.list.size();i++){ xY>@GSO1
CountBean cb=(CountBean)CountCache.list.getFirst(); L(+I
CountCache.list.removeFirst(); z~(3S8$
ps.setInt(1, cb.getCountId()); u.dYDi
ps.executeUpdate();⑴ xTg=oq
//ps.addBatch();⑵ lgQ"K(zY
} ~kFL[Asnaf
//int [] counts = ps.executeBatch();⑶ x>$e*
conn.commit(); &OsO _F
}catch(Exception e){ p(Ux]_s%
e.printStackTrace(); #%7)a; '
} finally{ .W
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try{ c8Je&y8
if(ps!=null) { cPy/}A
ps.clearParameters(); AX;!-|bW
ps.close(); qV79bK
ps=null; #ADm^UT^
} Ake@krh>$
}catch(SQLException e){} 5yk#(i7C
DBUtils.closeConnection(conn); M>[e1y>7
} 'e/wjV
} Z@,[a
public long getLast(){ L@s_)?x0
return lastExecuteTime; ( 4(,"
} 7>lM^ :A
public void run(){ ir|c<~_=
long now = System.currentTimeMillis(); /V
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if ((now - lastExecuteTime) > executeSep) { !|Wf
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//System.out.print("lastExecuteTime:"+lastExecuteTime); VYjt/\Z
//System.out.print(" now:"+now+"\n"); {B-*w%}HU
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Bmt^*;WY+
lastExecuteTime=now; 1Li*n6tLX`
executeUpdate(); Z@(KZ|
} jn(%v]
else{ $*;`$5.x^
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); s'|t2`K("
} ?4^ 0xGyE
} cj9C6Y!
} T+e*' <!O
//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 5] LfJh+"n
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类写好了,下面是在JSP中如下调用。 M|NQoQ8q
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<% Y_K W9T_
CountBean cb=new CountBean(); df!i}L
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); u*/+cT
CountCache.add(cb); Wy%FF\D.Y
out.print(CountCache.list.size()+"<br>"); e3ce?gk
CountControl c=new CountControl(); K)U[xS;<
c.run(); vA}_x7}n(
out.print(CountCache.list.size()+"<br>"); gB~^dv {
%>