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: /&6Q)
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CountBean.java VO|u8Z"
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/* Bxt_a.LthH
* CountData.java Gl"wEL*
* ]!-R<[b
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* Created on 2007年1月1日, 下午4:44 `.`FgaJ
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* &m4f1ZO*
* To change this template, choose Tools | Options and locate the template under vC-[#]<
* the Source Creation and Management node. Right-click the template and choose iz(m3k:w
* Open. You can then make changes to the template in the Source Editor. m&ZJqsZIL
*/ CQjV!d0j
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package com.tot.count; _-(z@
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/** G\uU- z$)
* m]e0X*Kg
* @author "V:XhBG?
*/ 63SVIc~wT
public class CountBean { k|fh\F+$
private String countType; sI4QI\*4
int countId; 4t*<+H%
/** Creates a new instance of CountData */ (w}r7`n
public CountBean() {} 6\XP|n-0+0
public void setCountType(String countTypes){ 9M;I$_U`vj
this.countType=countTypes; 4fD`M(wv
} v(a9#bMZU
public void setCountId(int countIds){ #'#4hJ*YC
this.countId=countIds; >*Sv0#
} D8a)( wm
public String getCountType(){ "3v7 gtGG
return countType; I?A~zigO
} E=A/4p6\$
public int getCountId(){ ~;TV74~rr
return countId; vW9^hbdx
} _AVy:~/
} 20n%o&kG]8
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CountCache.java p$B)^S%0i
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/* w"yK\OE
* CountCache.java 69N1 mP
* H+nr5!`kz
* Created on 2007年1月1日, 下午5:01 UnJi& ~O
* TeOFAIU
* To change this template, choose Tools | Options and locate the template under -DA;KWYS
* the Source Creation and Management node. Right-click the template and choose \%Pma8&d
* Open. You can then make changes to the template in the Source Editor. N45s'rF
*/ [''=><
<?{ SU
package com.tot.count; no eb f
import java.util.*; *4zoAs lU1
/** c>M_?::)0
* JiG8jB7%}
* @author 77)OW$G
*/ Ufyxw5u5F
public class CountCache { 7MR:X#2v>
public static LinkedList list=new LinkedList(); @oUf}rMiDa
/** Creates a new instance of CountCache */ s9^"wN YQ
public CountCache() {} L2:oZ&:u`J
public static void add(CountBean cb){ "-G.V#zI
if(cb!=null){ fJ,8g/f8
list.add(cb); J+-,^8)
} ZS07_6.~
} O%rS;o
} 0tn7Rkiw
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CountControl.java 2n<qAl$t
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/* LA( f]Xmc
* CountThread.java y}.y,\S0
* D_L'x"
* Created on 2007年1月1日, 下午4:57 9 ayH:;
*
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* To change this template, choose Tools | Options and locate the template under C={sE*&dYX
* the Source Creation and Management node. Right-click the template and choose oZ|{J
* Open. You can then make changes to the template in the Source Editor. 0O@[on;Bd
*/ >B|ofwm*
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package com.tot.count; 74</6T]^
import tot.db.DBUtils; ?Vb=4B{~
import java.sql.*; J\,@Bm|1n{
/** KV3+}k
* Y D1g]p
* @author c;A
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*/ &QHA_+88W
public class CountControl{ vwSX$OZ
private static long lastExecuteTime=0;//上次更新时间 p)AvG;
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 B%?|br
/** Creates a new instance of CountThread */ U7f#Z
public CountControl() {} 7i%P&oB
public synchronized void executeUpdate(){ J0{WqA.P
Connection conn=null; 0Mzc1dG:
PreparedStatement ps=null; et7 T)(k0
try{ D(2kb
conn = DBUtils.getConnection(); 2T{-J!k
conn.setAutoCommit(false); ui: >eYv
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 5#A1u
Nb
for(int i=0;i<CountCache.list.size();i++){ (*@~HF,t=
CountBean cb=(CountBean)CountCache.list.getFirst(); mYU dh L^
CountCache.list.removeFirst(); 'FvhzGn9Q
ps.setInt(1, cb.getCountId()); s`{#[&[
ps.executeUpdate();⑴ ~P.-3
//ps.addBatch();⑵ b&_u
O
} ps4Wwk(
//int [] counts = ps.executeBatch();⑶ ~N+/ZVo&y
conn.commit(); % /wP2O<
}catch(Exception e){ T[2f6[#[_
e.printStackTrace(); &t@6qi`d
} finally{ ^?l-YnQqm?
try{ %.Q2r ?j
if(ps!=null) { "$wPq@
ps.clearParameters(); ^#6%*(D
ps.close(); 8;dbU*
ps=null; D-\'P31
} [OToz~=)
}catch(SQLException e){} 77[;J
DBUtils.closeConnection(conn); q?'gwH37
} %A Du[M.
} ^zs4tCW %
public long getLast(){ <38@b
]+
return lastExecuteTime; )@&?i.
} DWevg;_]$(
public void run(){ 9G\3hL]
long now = System.currentTimeMillis(); I4DlEX
if ((now - lastExecuteTime) > executeSep) { GeW$lA I
//System.out.print("lastExecuteTime:"+lastExecuteTime);
i{x0#6_Y
//System.out.print(" now:"+now+"\n"); "a_D]D(d5
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); l+kg4y
lastExecuteTime=now; {w1h<;MH
executeUpdate(); +!Gr`&w*)
} ,0u0 '
else{ FZI 4?YD?<
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); C36.UZoc
} X;a{JjN
} .KMi)1L)
} 'C8=d(mR=m
//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 .2- JV0
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类写好了,下面是在JSP中如下调用。 K@u."eaD
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<% X!+ a;wr
CountBean cb=new CountBean(); Zkep7L
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); uM6!RR!~
CountCache.add(cb); ~oR&0et
out.print(CountCache.list.size()+"<br>"); CO+jB
CountControl c=new CountControl(); gd,%H@3
c.run(); 6&Ir0K/
out.print(CountCache.list.size()+"<br>"); zi&d
%>