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: ?wPTe^Qtv
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CountBean.java "i(f+N,)
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/* n]Yz<#
* CountData.java o]4BST(A
* h6?^rS8U
* Created on 2007年1月1日, 下午4:44 '%t$mf!nV
* K"XwSZ/
* To change this template, choose Tools | Options and locate the template under |v%$Q/zp&
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. e|~{X\l
*/ P8ej9ULX,
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package com.tot.count; FS&QF@dtgf
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/** -XL?n/M
* }wn|2K'
* @author Xe\}(O
*/ 4cSs=|m?+
public class CountBean { CHv
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private String countType; \mGb|aF8
int countId; QxE%C
/** Creates a new instance of CountData */ ;kZD>G8
public CountBean() {} fJ.=,9:<
public void setCountType(String countTypes){ r+[g.`
this.countType=countTypes; *!y04'p`<
} D9NRM;v
public void setCountId(int countIds){ d7b`X<=@s
this.countId=countIds; q1 q~%+Jy
} }0E@eL
public String getCountType(){ hlV(jz
return countType; cwaR#-#
} EJC}"%h
public int getCountId(){ I:=!,4S;
return countId; lY`WEu
} vFJ4`Gjw(
} M<Z#4Gg#4
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CountCache.java EB+4]MsD
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/* 9mMQ
* CountCache.java F czia0@z
* AM!P?${a
* Created on 2007年1月1日, 下午5:01 K[noW
* EMH-[EBx
* To change this template, choose Tools | Options and locate the template under 7SkW!5
* the Source Creation and Management node. Right-click the template and choose Z%.Ld2Q{
* Open. You can then make changes to the template in the Source Editor. 4xs>X7
*/ NPBOG1q%
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package com.tot.count; M-QQ
import java.util.*; {yf,:5
/** C;ha2UV0H
* /8_x]Es/
* @author ZyC[w7$I2
*/ T^|6{ S\
public class CountCache { tJd/uQJ
public static LinkedList list=new LinkedList(); E(S$Q^
/** Creates a new instance of CountCache */ !_o1;GzK
public CountCache() {} :5^5l
public static void add(CountBean cb){ p'/%"
if(cb!=null){ A#~CZQY^$
list.add(cb); q}JP;p(#
} M#],#o*G
} >>-{AR0
} fEK%)Z:0
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CountControl.java ]a~gnz&1
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/* Tt0]G_
* CountThread.java r)qow.+&
* MGKSaP;x
* Created on 2007年1月1日, 下午4:57 :NwFJc
* [9CBTSr
* To change this template, choose Tools | Options and locate the template under :Ot5W
* the Source Creation and Management node. Right-click the template and choose GV)DLHiyxX
* Open. You can then make changes to the template in the Source Editor. ]ao%9:P;
*/ [ dVRVm0N
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package com.tot.count; %8%0l*n'
import tot.db.DBUtils; @q" #.?>s
import java.sql.*; 8`w#)6(V
/** QN~9O^
* gAGcbepX
* @author
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*/ *zPz)3;
public class CountControl{ ?
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private static long lastExecuteTime=0;//上次更新时间 r$d'[ZcX
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 R?,XSJ
/** Creates a new instance of CountThread */ Fmrl*tr
public CountControl() {} _3Q8R}
public synchronized void executeUpdate(){ ~{yQsEU
Connection conn=null; 1,G f;mcQ
PreparedStatement ps=null; Ria*+.k@"B
try{ 24_/JDz
conn = DBUtils.getConnection(); b;(BMO,(
conn.setAutoCommit(false); *3Ci4\Ew
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); pB]+c%\
for(int i=0;i<CountCache.list.size();i++){ N^tH&\G\m
CountBean cb=(CountBean)CountCache.list.getFirst(); ZEU/6.
CountCache.list.removeFirst(); G?{uR6s>#
ps.setInt(1, cb.getCountId()); mt3j$r{_
ps.executeUpdate();⑴ a<Ptm(,
//ps.addBatch();⑵ XbAoW\D(
} FHu+dZ
//int [] counts = ps.executeBatch();⑶ OOX}S1lA
conn.commit(); (V+iJ_1g{
}catch(Exception e){ 3HmJixy
e.printStackTrace(); )eSD5hOI)
} finally{ -jsk-,
try{ lMBXD?,,J
if(ps!=null) { 3LD`Ep
ps.clearParameters(); wTY8={p]
ps.close(); ib)AC,LT
ps=null; m:XMF)tW
} $5/lU
}To
}catch(SQLException e){} zz+[]G+"2m
DBUtils.closeConnection(conn); sv?Lk4_
} Bl)DuCV
} h/n&&J
public long getLast(){ @5\ns-%
return lastExecuteTime; )o8]MWT\;
} rYMHc@a9(
public void run(){ )`.'QW
long now = System.currentTimeMillis(); ep2#a#&'
if ((now - lastExecuteTime) > executeSep) { ]p2M!N,?
//System.out.print("lastExecuteTime:"+lastExecuteTime); P 6|\
^
//System.out.print(" now:"+now+"\n"); >w"k:O17
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ${F]N }
lastExecuteTime=now; ;4 ON
executeUpdate(); mN:p=.&
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} 5 J9,/M0
else{ KoNJ;YiKtN
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Xy(o0/7F9
} Bzw!,(u/
"
} 36U
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} qEoa%O
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 <X_I`
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类写好了,下面是在JSP中如下调用。 MdOQEWJ$|
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<% o4"7i 9+g
CountBean cb=new CountBean(); ]D;X"2I2'b
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (
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CountCache.add(cb); Q,mmHw.`J
out.print(CountCache.list.size()+"<br>"); /i#~#Bn|
CountControl c=new CountControl(); p=65L
c.run(); *3A[C-1~.
out.print(CountCache.list.size()+"<br>"); 9_z u*
%>