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: 'C
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CountBean.java '%W'HqVcG1
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/* omxBd#;F$
* CountData.java pNOVyyo>BW
* -{Lc?=
* Created on 2007年1月1日, 下午4:44 F1V[8I.0
* ?)B"\#`t
* To change this template, choose Tools | Options and locate the template under +]n.uA-`[a
* the Source Creation and Management node. Right-click the template and choose I91pX<NBf
* Open. You can then make changes to the template in the Source Editor. ; Nw.
*/ -Jo8jE~>V
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package com.tot.count; Sm(QgZO[4
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/** ?
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* (S:+#v
* @author traJub
*/ oo{5:
public class CountBean { \z}/=Qgc
private String countType; sGNVZx
int countId; :!omog
/** Creates a new instance of CountData */ ,/.U'{
public CountBean() {} jTNfGu0x
public void setCountType(String countTypes){ F&{RP>
this.countType=countTypes; S
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} Vb|;@*=R&Q
public void setCountId(int countIds){ ^wL
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this.countId=countIds; )4d)G5{
} t6.hg3Y
public String getCountType(){ m){.{Vn]
return countType; \bt+46y@]
} KRS_6G],{
public int getCountId(){ >U~B"'!xV
return countId; _":yUa0D
} 'qTMY*
} j1!P:(
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CountCache.java 2.I'`A
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/* ` [ EzU+
* CountCache.java njk.$]M|nf
* zE{@'
* Created on 2007年1月1日, 下午5:01 ;T0Y=yC
*
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* To change this template, choose Tools | Options and locate the template under |aiP7C
* the Source Creation and Management node. Right-click the template and choose %IS'R`;3
* Open. You can then make changes to the template in the Source Editor. ALw5M'6q0\
*/ ={9G.%W
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package com.tot.count; 1vTncU!
import java.util.*; WZk\mSNV
/** `{g8A P3
* ^}XKhn.S'
* @author ?Gq'r2V
*/ !B==cNq
public class CountCache { tuA,t
public static LinkedList list=new LinkedList(); *_<P%J
/** Creates a new instance of CountCache */ Lc>9[!+#
public CountCache() {} ;!<WL@C~
public static void add(CountBean cb){ Wt +,6Cq
if(cb!=null){ aq[ ;[$w
list.add(cb); m1 78S3
} S7-ka{S
} e^g3J/aU
} Jtj_Rl
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CountControl.java nZ>bOP+,
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/* i2{xW`AcUh
* CountThread.java fP`g#t)4Tu
* /^~3Ib8Fw+
* Created on 2007年1月1日, 下午4:57 lAsDdxB`
* +w Oa
* To change this template, choose Tools | Options and locate the template under ,jWMJ0X/N=
* the Source Creation and Management node. Right-click the template and choose i/rdPbq
* Open. You can then make changes to the template in the Source Editor. IxT[1$e
*/ ; Xy\7tx
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package com.tot.count; ~mc7O
import tot.db.DBUtils; ?3!"js
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import java.sql.*; iw6qNV:\Z
/** @%L4^ms
* a^qLyF&F
* @author \Q"o\:IoIT
*/ [>"bL$tlo*
public class CountControl{ 6JWCB9$4
private static long lastExecuteTime=0;//上次更新时间 k%\_UYa
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 **rA/*Oc
/** Creates a new instance of CountThread */ `"v5bk
public CountControl() {} .BGM1ph}~
public synchronized void executeUpdate(){ "|CzQ&e
Connection conn=null; qkC+9Sk
PreparedStatement ps=null; w]n20&
try{ :.!]+#Me
conn = DBUtils.getConnection(); VOBzB]
conn.setAutoCommit(false); u7>b}+ak&
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); C Ih@H6|
for(int i=0;i<CountCache.list.size();i++){ D'aq^T'
CountBean cb=(CountBean)CountCache.list.getFirst(); ~LPxVYhK
CountCache.list.removeFirst(); ~\tI9L?|A
ps.setInt(1, cb.getCountId()); -;_`>OU{
ps.executeUpdate();⑴ ` bd
//ps.addBatch();⑵ <8MKjf
} `r+"2.z*
//int [] counts = ps.executeBatch();⑶ 27*u^N*z@
conn.commit(); jw$3cwddH
}catch(Exception e){ vS-k0g;
e.printStackTrace(); ._m+@Uy]H}
} finally{ O=}4?Xv
try{ '~i}2e.
if(ps!=null) { wZVY h
ps.clearParameters(); P0J3ci}^
ps.close(); HlqvXt\
ps=null; Ktg{-Xl
} 9I8{2]
}catch(SQLException e){} >N>WOLbb7(
DBUtils.closeConnection(conn); 9l2,:EQ*
} &^e%gU8!\
} #%k!`?^fbK
public long getLast(){ *6~ODiB
return lastExecuteTime; F)/}Q[o8
} @-bX[}.
public void run(){ _^Lv8a3(O
long now = System.currentTimeMillis(); ][-N<
if ((now - lastExecuteTime) > executeSep) { jC1mui|Y^
//System.out.print("lastExecuteTime:"+lastExecuteTime); h+Km |
//System.out.print(" now:"+now+"\n"); 4g]Er<-P
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); tS,nO:+x
lastExecuteTime=now; ~vnG^y>%
executeUpdate(); e2Sm.H '
} LtKiJ.j?A
else{ t3K7W2bz
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); D.o|pTZ
} }f np}L
} kf+]bV
} MZf$8R
//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 6Y6DkFdvrZ
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类写好了,下面是在JSP中如下调用。 6V\YYrUz
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<% $5y%\A
CountBean cb=new CountBean(); 24"Trg\WK[
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); /*g3TbUs
CountCache.add(cb); Ed ,`1+
out.print(CountCache.list.size()+"<br>"); Tx?,]c,(u
CountControl c=new CountControl(); 2<wuzP|
c.run(); <b>@'\w9
out.print(CountCache.list.size()+"<br>"); *@=in7*c
%>