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: ,=z8aiUu
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CountBean.java ~fQ#-ekzqk
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/* q=|>r
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* CountData.java ]36 R_Dp
* @KNp?2a
* Created on 2007年1月1日, 下午4:44 HtS:'~DYo
* knF *~O :y
* To change this template, choose Tools | Options and locate the template under v#D9yttO{
* the Source Creation and Management node. Right-click the template and choose f*kT7PJG
* Open. You can then make changes to the template in the Source Editor. U2+CL)al^
*/ ,/JrQWgD
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package com.tot.count; 0$* z
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/** hwkol W
* g4%x7#vz0
* @author #p*OLQ3~
*/ bxEb2D
public class CountBean { o_os;
private String countType; m5f/vb4l
int countId; 0.|tKetHq
/** Creates a new instance of CountData */ PX(Gx%s|
public CountBean() {} E}\^GNT
public void setCountType(String countTypes){ Wc03Sv&FZ
this.countType=countTypes; =^=9z'u"=
} +<@7x16
public void setCountId(int countIds){ .U9NQwd
this.countId=countIds; >y%$]0F1
} ]?mWnEi!z
public String getCountType(){ :]e:-JbT4z
return countType; 5GT,:0
} r'pFHX
public int getCountId(){ T"8>6a@}E
return countId; 6Z|/M6f
} '-gk))u>)
} QBY7ZT05Gt
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CountCache.java #y}@FG
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/* \f0I:%-
* CountCache.java LQNu]2
* BalOph4M[
* Created on 2007年1月1日, 下午5:01 GAtK1%nPD
* 7Cp>i WV
* To change this template, choose Tools | Options and locate the template under F)5QpDmqb
* the Source Creation and Management node. Right-click the template and choose 9j$
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8
* Open. You can then make changes to the template in the Source Editor. htlsU*x
*/ HSp*lHU
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package com.tot.count; E=sBcb/v
import java.util.*; u#la+/
/** -!(3fO:
* nLQ
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* @author H,KU!1p
*/ +J_A*B
public class CountCache { tN";o\!}
public static LinkedList list=new LinkedList(); *G>V`||RW
/** Creates a new instance of CountCache */ RZm5[n
public CountCache() {} z`>a,X
public static void add(CountBean cb){ zUIh8cAoE
if(cb!=null){ ^X"G~#v=q
list.add(cb); c<DsCzX
} ?ti7iBz?
} d7$H})[^
} Qj[4gN?}=
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CountControl.java CHN!o9f
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/*
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* CountThread.java REQ2pfk0
* "g>uNtt~
* Created on 2007年1月1日, 下午4:57 $-M1<?5
* V:QfI
* To change this template, choose Tools | Options and locate the template under D:8-f3
* the Source Creation and Management node. Right-click the template and choose ZV_mP'1*
* Open. You can then make changes to the template in the Source Editor. *z` {$hc
*/ {nm#aA%,
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package com.tot.count; (@uQ>dR:
import tot.db.DBUtils; g0cCw2S
import java.sql.*; UyD=x(li
/** H,:Cg:E/^
* b;9v.MZ4>g
* @author 7{v0K"E{
*/ 08yTTt76t
public class CountControl{ j)'V_@
private static long lastExecuteTime=0;//上次更新时间 IC92lPM }
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _Dwn@{[(8
/** Creates a new instance of CountThread */ _+z@Qn?#6h
public CountControl() {} $J=9$.4"
public synchronized void executeUpdate(){ =
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Connection conn=null; 7s<v06Wo
PreparedStatement ps=null; f!xIMIl)+
try{ 1PjSa4
conn = DBUtils.getConnection(); zu*0uL
conn.setAutoCommit(false); AG/nX?u7)t
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); w+2:eFi=/
for(int i=0;i<CountCache.list.size();i++){ 7.8ukAud
CountBean cb=(CountBean)CountCache.list.getFirst(); RTH dL
CountCache.list.removeFirst(); [^1;8Tbk
ps.setInt(1, cb.getCountId()); kxThtjgv
ps.executeUpdate();⑴ wf6ZzG:
//ps.addBatch();⑵ @>(l}5U5
} 1S
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//int [] counts = ps.executeBatch();⑶ ,;GWn
conn.commit(); @ DU]XKv
}catch(Exception e){ Uc<B)7{'
e.printStackTrace(); 0N_Ma')i
} finally{ nU[ROy5
try{ :9_K@f?n
if(ps!=null) { 1p+2*c
ps.clearParameters(); Vy-H3BR
ps.close(); s@^GjA[6+
ps=null; J@(*(oQb
} xfos>|0N
}catch(SQLException e){}
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DBUtils.closeConnection(conn); pc^(@eD
} Rj^bZ%t
} ,yAvLY5P
public long getLast(){ Ga N4In[d
return lastExecuteTime; rQj.W6w=
} lv&<kYWY
public void run(){ m#grtmyMrI
long now = System.currentTimeMillis(); bveNd0hN
if ((now - lastExecuteTime) > executeSep) { N%_-5Q)so
//System.out.print("lastExecuteTime:"+lastExecuteTime); -t:yy:4
//System.out.print(" now:"+now+"\n"); JAmv 7GL'6
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 76zi)f1f
lastExecuteTime=now; &q``CCOF&
executeUpdate(); %mtW-drv>
} )nQpO"+M
else{ @6h=O`X>
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "%qGcC8
} A}H)ojG'v
} N$:[`,
} Z^>3}\_v
//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 wH{lp/
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类写好了,下面是在JSP中如下调用。 JgYaA*1X
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<% -;Cl0O%
CountBean cb=new CountBean(); e|"`W`"-
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Y]B2-wt-
CountCache.add(cb); l: 1Zq_?v;
out.print(CountCache.list.size()+"<br>"); ,)S|%tDW
CountControl c=new CountControl(); \W??`?Idh
c.run(); Hd2Sou4-j
out.print(CountCache.list.size()+"<br>"); ~iEH?J%i1r
%>