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: =|- xj h
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CountBean.java N/^[c+J[E
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/* OK}8BY
* CountData.java jS/$o ?
* ";0-9*I
* Created on 2007年1月1日, 下午4:44
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* C$c.(5/O
* To change this template, choose Tools | Options and locate the template under yNx"Ey dk`
* the Source Creation and Management node. Right-click the template and choose )>=|oY3
* Open. You can then make changes to the template in the Source Editor. t^9q>[/d`
*/ S
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package com.tot.count; qn\>(&
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/** JY>I
* \}qv}hU
* @author ;#"`]khd
*/ zwHTtE
public class CountBean { gwF@'Uu
private String countType; `+@%l*TQ
int countId; WUi7~Ei}
/** Creates a new instance of CountData */ lu.2ZQE
public CountBean() {} PsD]gN5"
public void setCountType(String countTypes){ 0MzHr2?'P
this.countType=countTypes; d}415 XA
} 5O%}.}n
public void setCountId(int countIds){ ma*9O |v^
this.countId=countIds; 1Kebl
} I`KN8ll
public String getCountType(){ }#u}{
return countType; .g&BA15<F6
} ||,;07
public int getCountId(){ anV)$PT=
return countId; ?,),%JQ
} G6Fg<g9:
} en~(XE1
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CountCache.java ;[zx'e?!
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/* -s!PO;qm
* CountCache.java `RzM)ILl
* $1@{Zz!S
* Created on 2007年1月1日, 下午5:01 <?nr"V
* S I(8.$1
* To change this template, choose Tools | Options and locate the template under kI;^V
* the Source Creation and Management node. Right-click the template and choose XKK*RVs#
* Open. You can then make changes to the template in the Source Editor. },L[bDOV07
*/ 6$5M^3$-
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package com.tot.count; Wl2>U(lj
import java.util.*; |Z/ySAFM
/** %`\{Nxk
* nb!m>0*/
* @author |ZKchd8Yq
*/ bcE DjLXq
public class CountCache { liB>~DVC
public static LinkedList list=new LinkedList(); !%(B2J
/** Creates a new instance of CountCache */ +]_} \
public CountCache() {} %?$"oWmenS
public static void add(CountBean cb){ ?d%}K76V<
if(cb!=null){ zC^Ib&gm>,
list.add(cb); -
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} n(+:l'#HJ
} jHZ<Gc
} ']NM_0
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CountControl.java pQ hv3F
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/* #75;%a8
* CountThread.java dA~6{*)
* 'mM5l*{
* Created on 2007年1月1日, 下午4:57 sig_2;
* / u{r5`4
* To change this template, choose Tools | Options and locate the template under Pg36'aTe%j
* the Source Creation and Management node. Right-click the template and choose J5"*OH:f
* Open. You can then make changes to the template in the Source Editor. PTh
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*/ 3WYW])
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package com.tot.count; ;D7jE+
import tot.db.DBUtils; \NqC i'&
import java.sql.*; gs3}rW
/** V_QVLW
* )qIK7;
* @author {1+H\(v
*/ y()( 8L
public class CountControl{ A0ToX) |C
private static long lastExecuteTime=0;//上次更新时间 jj2UUQ|
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 >A/=eW/q
/** Creates a new instance of CountThread */ @6SSk=9_S
public CountControl() {} BTyVfq
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public synchronized void executeUpdate(){ jo*9QO
Connection conn=null; DPOPRi~
PreparedStatement ps=null; mI%/k7:sf
try{ u"jnEKN0y
conn = DBUtils.getConnection(); z"#.o^5
conn.setAutoCommit(false); %U7B0-
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Mm!saKT%
for(int i=0;i<CountCache.list.size();i++){ 0Pk-FSY|f
CountBean cb=(CountBean)CountCache.list.getFirst(); B .mV\W
CountCache.list.removeFirst(); fna>>
ps.setInt(1, cb.getCountId()); pS;dvZ
ps.executeUpdate();⑴ 9_3M}|V$^e
//ps.addBatch();⑵ ]r6bJ2
} v"+EBfx
//int [] counts = ps.executeBatch();⑶ GB3B4)cX4Y
conn.commit(); X;:xGZ-oY
}catch(Exception e){ Tt|6N*b'
e.printStackTrace(); }i:'f2/
} finally{ 8B/9{8
try{ @`D6F;R
if(ps!=null) { w ZAXfNA
ps.clearParameters(); tqCg<NH.!m
ps.close(); .<%M8rcj
ps=null; 17oxD
} >>zoG3H!
}catch(SQLException e){} gUA}%YXe
DBUtils.closeConnection(conn); em}Qv3*#
} RfG$Px '
} 0pa^O$?p
public long getLast(){ 9G+rxyWMW
return lastExecuteTime; XH$|DeAFM
} V&v~kzLr+
public void run(){ CJ
long now = System.currentTimeMillis(); d|RmU/)
if ((now - lastExecuteTime) > executeSep) { z&,sm5Lb
//System.out.print("lastExecuteTime:"+lastExecuteTime); {PtTPz
//System.out.print(" now:"+now+"\n"); Ky$G$H
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %0]b5u
lastExecuteTime=now; $]J IA|
executeUpdate(); .6o y>4
}
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else{ }tO<_f))
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); G!%XQ\a!
} >[4|6k|\x
} B
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} Vj`s_IPY
//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 B-'BJ|*4I
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类写好了,下面是在JSP中如下调用。 O \8G~V
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<% 9XvM%aHs:
CountBean cb=new CountBean(); h_GBx|c
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {<[tYZmj.
CountCache.add(cb); .+L_!A
out.print(CountCache.list.size()+"<br>"); -G#@BtB2+
CountControl c=new CountControl(); LE80`t>M#
c.run(); L00;rTs>
out.print(CountCache.list.size()+"<br>"); }SN44 di(
%>