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: 0M -AIQ5
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CountBean.java iO`f{?b
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/* -v@^6bQVp
* CountData.java q)zvePO#
* YaNVpLA
* Created on 2007年1月1日, 下午4:44 <qx-%6
* C ( ;7*]
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose J?$uNlI
* Open. You can then make changes to the template in the Source Editor. 42LV>X#i
*/ 6d8
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package com.tot.count; tjt#VFq?
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/** !/j|\_O
* S/jHyJ,
* @author oGJI3Oh
*/ xw
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public class CountBean { ~'iuh>O)
private String countType; 0AenDm@9
int countId; XWV ~6"
/** Creates a new instance of CountData */ rE~O}2a#H
public CountBean() {} t[~i})yS
public void setCountType(String countTypes){ / KM+PeO
this.countType=countTypes; r; !us~
} 5S bSz!s`$
public void setCountId(int countIds){ 8~&v\GDkF
this.countId=countIds; Xw)+5+t"{
} ]A[~2]
public String getCountType(){ C?k4<B7V
return countType; m^KkS
} ppA8c6
public int getCountId(){ G>"[nXmcu
return countId;
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} eO#)QoHj^
} `mVH94{+I
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CountCache.java NunT2JP.
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/* 0"Hf6xz
* CountCache.java lom4z\6
* ;d:7\
* Created on 2007年1月1日, 下午5:01 %l,EA#89s
* d"a`?+(Q
* To change this template, choose Tools | Options and locate the template under .&xc2sRZ
* the Source Creation and Management node. Right-click the template and choose j!pxG5%
* Open. You can then make changes to the template in the Source Editor. T^W8_rm*3
*/ &bb*~W-
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package com.tot.count; EIAT*l :NW
import java.util.*; HAXx`r<
/** [gDvAtTZ5
* /hHD\+0({
* @author WJWhx4Hk
*/ V-57BKeDz
public class CountCache { ( ;q$cKy
public static LinkedList list=new LinkedList(); Ff30%
/** Creates a new instance of CountCache */ IU/*YI%W
public CountCache() {} fpUX
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public static void add(CountBean cb){ "]%
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if(cb!=null){ j*nCIxF
list.add(cb); ^z1WPI
} WqAP'x 1
} Bvwk6NBN
} E#OKeMK
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CountControl.java }|;n[+ }
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/* ^`$KN0PY
* CountThread.java 4*]`s|fbu
* ;lldxS
* Created on 2007年1月1日, 下午4:57 >:Ec
* BScysoeD
* To change this template, choose Tools | Options and locate the template under 1'=brc YR
* the Source Creation and Management node. Right-click the template and choose )xU70:X
* Open. You can then make changes to the template in the Source Editor. G[<iVt$y
*/ TG($l2
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package com.tot.count; WA+v&*]
import tot.db.DBUtils; rB\UNXy
import java.sql.*; @eul~%B{X
/** k58lmuU
* MLJ8m
* @author ax$0J|}7
*/ I]h+24_S
public class CountControl{ rYT3oqpfT
private static long lastExecuteTime=0;//上次更新时间 ]yyfE7{q
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Y,9("'bo
/** Creates a new instance of CountThread */ G{:L^2>
public CountControl() {} h^4oy^9
public synchronized void executeUpdate(){ ,Tpds ^
Connection conn=null; a)xN(xp##
PreparedStatement ps=null; ,PnEDQ|l
try{ {.sF&(e
conn = DBUtils.getConnection(); zOcMc{w0
conn.setAutoCommit(false); h`)r :a7
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7dLPy[8";t
for(int i=0;i<CountCache.list.size();i++){ 'del|"h!M
CountBean cb=(CountBean)CountCache.list.getFirst(); p?%G|Q
CountCache.list.removeFirst(); dM)fr
ps.setInt(1, cb.getCountId()); G$q=WM!%#s
ps.executeUpdate();⑴ H7WKnn@
//ps.addBatch();⑵ t+pI<c^]y
} RNPqW,B!0
//int [] counts = ps.executeBatch();⑶ R8axdV9(
conn.commit(); q\ ?6-?Mr
}catch(Exception e){ y 8sI @y6
e.printStackTrace(); <I}k%q'
} finally{ 1}N5WBp
try{ Z)HQlm
if(ps!=null) { StE4n0V
ps.clearParameters(); UJQ!~g.y]
ps.close(); ks!
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ps=null; tTY (I1
} 7oUYRqd
}catch(SQLException e){} 4&?%" 2
DBUtils.closeConnection(conn); ?qdG)jo=
} g{&ux k);
} OUD<+i,
public long getLast(){ U*zjEY:A
return lastExecuteTime; \aG>(Mr
} 1=s%.0
public void run(){ he/FtkU
long now = System.currentTimeMillis(); Eh JYdO[e
if ((now - lastExecuteTime) > executeSep) { YoXXelO&
//System.out.print("lastExecuteTime:"+lastExecuteTime); 0 {w?u %'
//System.out.print(" now:"+now+"\n"); B}:[~R'
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); \!-X&ws
lastExecuteTime=now; k38Ds_sW6d
executeUpdate(); mI l_
[
} yfq"atj
else{ =oSv=xY
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); %lvSO/F+
} hhwV)Z
} b-wFnMXk+
} D:%v((Ccw
//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 DS^PHk39
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类写好了,下面是在JSP中如下调用。 )@Ly{cw
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<% norWNm(n
CountBean cb=new CountBean(); W"$'$h
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); G|.>p<q
CountCache.add(cb); 7D4P=$UJp
out.print(CountCache.list.size()+"<br>"); }F-W OQ
CountControl c=new CountControl(); /QG8\wXE2
c.run(); Mk7#qiPo
out.print(CountCache.list.size()+"<br>"); kz+P?mopm
%>