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: QX=TuyO
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CountBean.java
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/* iB)\*)
* CountData.java }yT/UlU
* XoKgs, y4
* Created on 2007年1月1日, 下午4:44 cGlN*GJ*H
* ;M~,S^U
* To change this template, choose Tools | Options and locate the template under k{ qxsNM
* the Source Creation and Management node. Right-click the template and choose X:W\EeH
* Open. You can then make changes to the template in the Source Editor. >Sc yc-n
*/ clvg5{^q[
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package com.tot.count; spa:5]B
#/YS
/** y0xBNhev
* Bp^LLH
* @author _Raf7 W
*/ ZXnacc~s
public class CountBean { g{N}]_%Uh
private String countType; ?}?"m:=
int countId; m*y&z'e\
/** Creates a new instance of CountData */ 'yiv.<4
public CountBean() {} 'h$1
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public void setCountType(String countTypes){ &wQ;J)13
this.countType=countTypes; |=q~X}DA
} Jqxd92 bI
public void setCountId(int countIds){ ai<qK3!O
this.countId=countIds; gv67+Mf
} (.#nl}fA
public String getCountType(){ T_*inPf
return countType; fG0ZVV!
} r?DCR\Jq
public int getCountId(){ xT>9ZZcE
return countId; 'Ix@<$~i3F
} hV@ N-u^
} cW*v))@2
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CountCache.java )c11_1;
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/* wNmpUO ?
* CountCache.java $#rkvG_w
* q(n"r0)=
* Created on 2007年1月1日, 下午5:01 /si<Fp)z
* c0o]O[
* To change this template, choose Tools | Options and locate the template under ]Za[]E8MD
* the Source Creation and Management node. Right-click the template and choose znrO~OK
* Open. You can then make changes to the template in the Source Editor. Mxl;Im]!`.
*/ /l<(i+0
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package com.tot.count; (u tP@d^
import java.util.*; kN/YnY*J<
/** .2%t3ul[
* T7nI/y
* @author [!)HWgx
*/ \ ITd\)F%N
public class CountCache { LAC&W;pJ"
public static LinkedList list=new LinkedList(); /phMrL=
/** Creates a new instance of CountCache */ v*V(hMy
public CountCache() {} Rrh6-]A
public static void add(CountBean cb){ W.^zN' a
if(cb!=null){ /0\g!29l<
list.add(cb); uzHMQp
} H~yHSm 3
} 'xta/@Sq
} E3 % ~!ZC
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CountControl.java L;0
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/* )B]s.w
* CountThread.java P;.roD9
* 0J+WCm`
* Created on 2007年1月1日, 下午4:57 y#a,d||N1
* E n7~wKF
* To change this template, choose Tools | Options and locate the template under z%E(o%l8
* the Source Creation and Management node. Right-click the template and choose 1 3]e< '
* Open. You can then make changes to the template in the Source Editor. lG-B)
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*/ *OA(v^@tx7
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package com.tot.count; nFJW\B&(`
import tot.db.DBUtils; 2,:{ 5]Q$
import java.sql.*; wn@~80)$
/** 8=$X hC
* (l%?YME
* @author 68j1svz9
*/ ,<
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public class CountControl{ `<g]p-=":
private static long lastExecuteTime=0;//上次更新时间 PPl o0R
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 T'}kCnp
/** Creates a new instance of CountThread */ >c_fUX={
public CountControl() {} oJD]h/fQs
public synchronized void executeUpdate(){ U@q5`4-!8
Connection conn=null; I\TSVJk^Xi
PreparedStatement ps=null; )jXKPLj
try{ :h(RS ;
conn = DBUtils.getConnection(); D9TjjA|zS
conn.setAutoCommit(false); Ja~8ZrcY
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ;=n}61
for(int i=0;i<CountCache.list.size();i++){ ;SE*En
CountBean cb=(CountBean)CountCache.list.getFirst(); qh.F}9o
CountCache.list.removeFirst(); 'o)Y!VYnJF
ps.setInt(1, cb.getCountId()); <n,QSy#
ps.executeUpdate();⑴ IoLP*D
//ps.addBatch();⑵ _FOIMjh%N
} __eB 7]#E
//int [] counts = ps.executeBatch();⑶ ?;o0~][!
conn.commit(); 4L,wBce;,t
}catch(Exception e){ I=dn]}b#P
e.printStackTrace(); {d<XDx4`
} finally{ qRaPh:Q'
try{ yf&_l^!
if(ps!=null) { f?:=@35
ps.clearParameters(); &jY|
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ps.close(); %T$>E7]!
ps=null; 3Iqvc v
} ?5CE<[
}catch(SQLException e){} hqln6m
DBUtils.closeConnection(conn); .tKBmq0xo"
} Xps
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} YZ<zlU
public long getLast(){ qeFaY74S
return lastExecuteTime; 6~sU[thGW
} M@KQOAzt
public void run(){ +F q_w
long now = System.currentTimeMillis(); rrz([2E2
if ((now - lastExecuteTime) > executeSep) { l 7uTk5
//System.out.print("lastExecuteTime:"+lastExecuteTime);
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//System.out.print(" now:"+now+"\n"); CKHmJ]=
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); x"sbm
lastExecuteTime=now; D7nK"]HG;l
executeUpdate(); T%oJmp?0
} pq
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else{ cBqbbZyUk
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /:]<z6R
} U\Y0v.11
} L+G0/G}O\
} I(AlRh
//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 ZxSnqbyA*
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类写好了,下面是在JSP中如下调用。 SW%}S*h
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<% E} ]=<8V
CountBean cb=new CountBean(); #/ePpSyD
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); c*B< -
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CountCache.add(cb); _IdW5G
out.print(CountCache.list.size()+"<br>"); `uMc.:5\
CountControl c=new CountControl(); Q9AvNj>X
c.run(); vE,^K6q0`
out.print(CountCache.list.size()+"<br>"); hBRi5&%
%>