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: "jHN#}
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CountBean.java #RF=a7&F
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/* <} %ir,8
* CountData.java zgqw*)C~
* FMVmH!E
* Created on 2007年1月1日, 下午4:44 tX251S
* /Uc*7Y5j
* To change this template, choose Tools | Options and locate the template under h,x]
* the Source Creation and Management node. Right-click the template and choose =r~.I
* Open. You can then make changes to the template in the Source Editor. z7q2+;L
*/ +2SX4Kxu
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package com.tot.count; .N=hA
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/** +!vRU`
* GcnY=%L?
* @author Nj0)/)<r+
*/ &wN
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public class CountBean { vNC0M:p,
private String countType; [Ni4[\
int countId; Aq!['G
/** Creates a new instance of CountData */ 2?QJh2
public CountBean() {} c*dww
public void setCountType(String countTypes){ vi8~j
this.countType=countTypes; 8-:k@W
} ^{:jY, ?]
public void setCountId(int countIds){ u7?juI#Cl
this.countId=countIds; %7msAvbk
} (fa?ftK
public String getCountType(){ >x4[7YAU{
return countType; hli10p$
} kA__*b}8UK
public int getCountId(){ au|^V^m
return countId; (:QQ7xc{}
} C8E C?fSQ
} -kbm$~P
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CountCache.java _wNPA1q0J
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/* "<x~{BN?
* CountCache.java `{F~'t['
* </gp3WQ.
* Created on 2007年1月1日, 下午5:01 | ",[C3Jg
* R: <@+z^A[
* To change this template, choose Tools | Options and locate the template under {~fCqP.2
* the Source Creation and Management node. Right-click the template and choose #}dVaXY)
* Open. You can then make changes to the template in the Source Editor. UglG!1L
*/ ;9 ,mV(w
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package com.tot.count; `t0f L\T
import java.util.*; {|Ki^8 h/p
/** liqR#<
* F,M"/hnPT
* @author <m,yFk
*/ xwnoZ&h
public class CountCache { mO)PJd2ZD
public static LinkedList list=new LinkedList(); 4iNbK~5j
/** Creates a new instance of CountCache */ tx5T^K7[
public CountCache() {} M+;P?|a
public static void add(CountBean cb){ 8i;)|z7
if(cb!=null){ rLh9`0|D
list.add(cb); vX0"S
} kq~[k.
} ;Q=GJ5`B
} c5E#QV0&v~
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CountControl.java ^8NLe9~p3?
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/*
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* CountThread.java
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* s`=/fvf.
* Created on 2007年1月1日, 下午4:57 LxlbD#<V
* ?96-" l
* To change this template, choose Tools | Options and locate the template under jD/7/G*
* the Source Creation and Management node. Right-click the template and choose a-5HIY5
* Open. You can then make changes to the template in the Source Editor. /^LH
*/ qX{X4b$
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package com.tot.count; LR3`=Z9
import tot.db.DBUtils; 5U{4TeUH
import java.sql.*; #_?TIY:h
/** ~J1;tZS
* iog #
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* @author ^+.t-3|U
*/ :YqQlr\
public class CountControl{ .6#cDrK
private static long lastExecuteTime=0;//上次更新时间 hB?,7-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 C[xJU6z
/** Creates a new instance of CountThread */ g={]Mzh
public CountControl() {} NTm<6Is`
public synchronized void executeUpdate(){ ]eYd8s+
Connection conn=null; .QXG"R
PreparedStatement ps=null; j9URl$T:
try{ X<~k =qwA
conn = DBUtils.getConnection(); V)0[`zJ
conn.setAutoCommit(false); 'u(=eJ@1
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); K/vxzHSl
for(int i=0;i<CountCache.list.size();i++){ @sw9A93A
CountBean cb=(CountBean)CountCache.list.getFirst(); ZD5I5
CountCache.list.removeFirst(); nTys4R
ps.setInt(1, cb.getCountId()); j-J(C[[9
ps.executeUpdate();⑴ )o#6-K+b
//ps.addBatch();⑵ `]`=]*d
} 7
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//int [] counts = ps.executeBatch();⑶ *A?8F"6>
conn.commit(); .P)s4rQ\
}catch(Exception e){ FZe:co8Mu
e.printStackTrace(); n1QEu"~Zj
} finally{ [D3+cDph
try{ o'C~~Vg).
if(ps!=null) { YBX)eWslK
ps.clearParameters(); q&zny2])
ps.close(); )v%l0_z{
ps=null; =X%!YZk p
} j4;Du>obQ
}catch(SQLException e){} iv:,fkwG
DBUtils.closeConnection(conn); TC qkm^xv
} QVIcb;&:}
} h&lyxYZ+T$
public long getLast(){ /~40rXH2C
return lastExecuteTime; {7vgHutp
} 8h2D+1,PZC
public void run(){ M_k`%o
long now = System.currentTimeMillis(); Z6
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if ((now - lastExecuteTime) > executeSep) { di7A/B
//System.out.print("lastExecuteTime:"+lastExecuteTime); RX:R*{]-
//System.out.print(" now:"+now+"\n"); O!;H}{[dg
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {!L=u/qs"
lastExecuteTime=now; gs?8Wzh90*
executeUpdate(); *kP;{Cb`
} qQ^d9EK'?~
else{ 'X9AG6K1
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); E W`W~h[
} K[kds`
} jz*0`9&_
} aX|g S\zx
//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 '=VH6@vZ_'
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类写好了,下面是在JSP中如下调用。 KyT uF
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<% `19qq]
CountBean cb=new CountBean(); tww=~!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); E Zi &]
CountCache.add(cb); lr,q{;
out.print(CountCache.list.size()+"<br>"); Oukd_Ryf
CountControl c=new CountControl(); *ot>WVB
c.run(); !v0"$V5+i
out.print(CountCache.list.size()+"<br>"); ]%
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%>