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: |@sUN:G4k
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CountBean.java / /3iai
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/* {tOu+zy
* CountData.java )0j^Fq5[+
* GXYmJ4wR
* Created on 2007年1月1日, 下午4:44 c/^}
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* ltwX-
* To change this template, choose Tools | Options and locate the template under -,uTAk0+@
* the Source Creation and Management node. Right-click the template and choose Y]Vt&*{JV
* Open. You can then make changes to the template in the Source Editor. O7g
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*/ )c^Rc9e/
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package com.tot.count; mHM38T9C%
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/** +j1s*}8
* eY-W5TgU
* @author ~-.}]N+([
*/ dPc*!xrq
public class CountBean { 4`I2tr
private String countType; fFMGpibkM
int countId; ONH!ms(kb
/** Creates a new instance of CountData */ yS[:C
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public CountBean() {} f-F+Y`P
public void setCountType(String countTypes){ ZgP=maQk
this.countType=countTypes; Aq yR+
} 8`v+yHjG
public void setCountId(int countIds){ E/v.+m
this.countId=countIds; ai)S:2
} 6}6;%{p"Gu
public String getCountType(){ oM G8?p
return countType; DJVH}w}9_P
} 4/;hA
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public int getCountId(){ -*~= 4m<
return countId; lr'h
} Ln'y 3~@
} /0Jf/-}ovn
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CountCache.java >&DC[)28
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/* [psZc'q
* CountCache.java dhX$b!DA
* Sj ly]
* Created on 2007年1月1日, 下午5:01 /!#A'#Z
* Ypx5:gm|J
* To change this template, choose Tools | Options and locate the template under 0OXl`V`w
* the Source Creation and Management node. Right-click the template and choose A"e4w?
* Open. You can then make changes to the template in the Source Editor. +>&i]x(b
*/ oF0DprP@
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package com.tot.count; $:?Dyu(Il
import java.util.*;
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/** )3IUKz%\6p
* ,i jB3J
* @author }qw->+nD
*/ A"B#t"
public class CountCache { l4gF.-.GYF
public static LinkedList list=new LinkedList(); 4#Xz-5v
/** Creates a new instance of CountCache */ !/a![Ne
public CountCache() {} "ejsz&n
public static void add(CountBean cb){ {#.<hPXn
if(cb!=null){ XDY QV.Bv
list.add(cb); 3PjX;U|
} "{S6iH)]8
} \#h{bnx
} s
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CountControl.java qeW.~B!B
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/* x8xz33
* CountThread.java <NEz{ 1Z
* 85f:!p
* Created on 2007年1月1日, 下午4:57 LOgFi%!6:
* !kG |BJ$j
* To change this template, choose Tools | Options and locate the template under naro
* the Source Creation and Management node. Right-click the template and choose }S$OE))u
* Open. You can then make changes to the template in the Source Editor. YV8PybThc
*/ =P9Tc"2PN
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package com.tot.count; o}&{Y2!x
import tot.db.DBUtils; m-qu<4A/U|
import java.sql.*; =9Vo [
/** hx*4xF
* 04WxV(fo'
* @author =r)LG,w212
*/ y!dw{Lz
public class CountControl{ 48Jt5Jz_
private static long lastExecuteTime=0;//上次更新时间 &mW7FR'(
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 cyLl,OA
/** Creates a new instance of CountThread */ .VR~[aD
public CountControl() {} ;PB_@Zg
public synchronized void executeUpdate(){ +1a3^A\
Connection conn=null; M&jlUr&l
PreparedStatement ps=null; {!j)j6(NY
try{ L PS,\+
conn = DBUtils.getConnection(); NBXhcfF
conn.setAutoCommit(false); 9[`c"Pd
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); !>"fDz<w`
for(int i=0;i<CountCache.list.size();i++){ C;5`G
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CountBean cb=(CountBean)CountCache.list.getFirst(); -%0pYB
CountCache.list.removeFirst(); gAh#H ?MM
ps.setInt(1, cb.getCountId()); {{Qbu}/@
ps.executeUpdate();⑴ `T+w5ONn
//ps.addBatch();⑵ qw*) R#=
} ?yxQs=&-q~
//int [] counts = ps.executeBatch();⑶ )@p?4XsT4J
conn.commit(); .R@s6}C`}=
}catch(Exception e){ aZ|?i
}
e.printStackTrace(); em95ccs'-
} finally{ =W;e9 6#
try{ ubZJ Um
if(ps!=null) { S[gACEZ =
ps.clearParameters(); 3~Lsa"/
ps.close(); c5| sda{
ps=null; |g>Q3E
} )"?eug}D
}catch(SQLException e){} d&+0JI<
DBUtils.closeConnection(conn); Ud Vf/PGx
} [!>9K}z,=
} 1l/t|M^I
public long getLast(){ W
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return lastExecuteTime; '=O1n H<
} 8{]nS8i
public void run(){ @ze2'56F}
long now = System.currentTimeMillis(); Q lA?dXQ
if ((now - lastExecuteTime) > executeSep) { 5HsF#
//System.out.print("lastExecuteTime:"+lastExecuteTime); J>k
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//System.out.print(" now:"+now+"\n"); aNs8T`
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); j74hWz+p4
lastExecuteTime=now; Q% d1O
executeUpdate(); >&Oql9_
} BzzZ.AH~
else{ Vhh=GJ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 2X[oge0@
} #s81k@#X
} Gov.;hy
} qo$ls\[X
//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 yoJ.[M4q
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类写好了,下面是在JSP中如下调用。 '!ks $}$`h
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<% g1?9ge1
CountBean cb=new CountBean(); SB08-G2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); o<iU;15
CountCache.add(cb); 1<fW .Q)
out.print(CountCache.list.size()+"<br>"); O) TS$
CountControl c=new CountControl(); zd)QCq
c.run(); gwsIzYV
out.print(CountCache.list.size()+"<br>"); PqL.^
%>