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: 7D:rq 8$\
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CountBean.java nIfAG^?|*
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/* S|LY U!IWZ
* CountData.java $^?VyHXvY
* p19@to5l
* Created on 2007年1月1日, 下午4:44 TKsP#Dt/
* >s"/uo
* To change this template, choose Tools | Options and locate the template under fvi0gE@bd
* the Source Creation and Management node. Right-click the template and choose 6\K\d_x
* Open. You can then make changes to the template in the Source Editor. h:?qd
*/ );t+~YPS
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package com.tot.count; ]plp.f#av
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/** >ZG$8y 'j
* </xf4.C
* @author R@tEC)Zn
*/ ;A7JX:*?y=
public class CountBean { m9:ah<
private String countType; SvvNk
int countId; w <"mS*Q
/** Creates a new instance of CountData */ ?vAhDD5
public CountBean() {} eQ8t.~5;-
public void setCountType(String countTypes){ dlCYdwP
this.countType=countTypes; wik<#ke
} C|3Xz[k{
public void setCountId(int countIds){ ZxT
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this.countId=countIds; J!5b~8`v
} .7b%7dQ<\
public String getCountType(){ =4SXntU!e
return countType; 9609
} DQXcf*R
public int getCountId(){ CyYr5 Dz
return countId; S1y6G/e9
} Ny/eYF#
} v3M$UiN,:
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CountCache.java QQV8Vlv"
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/* ~XuV:K3
* CountCache.java e_KfnPY
* M_ %-A
* Created on 2007年1月1日, 下午5:01 Khc^q*|C)
* gVzIEE25
* To change this template, choose Tools | Options and locate the template under `t)9u^[<(
* the Source Creation and Management node. Right-click the template and choose y'4Qt.1ukN
* Open. You can then make changes to the template in the Source Editor. Q/0gd? U?
*/ nC%qdzT
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package com.tot.count; Fih
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import java.util.*; Ow4(1eE_
/** Gvh"3|u?z
* /P TRe5-7
* @author W9tZX5V1
*/ $S?gQN.e
public class CountCache { L_vl%ii-
public static LinkedList list=new LinkedList(); m=^]93+
/** Creates a new instance of CountCache */ *DfOm`m
public CountCache() {} Rb:<?&7ZzN
public static void add(CountBean cb){ 76<mP*5
if(cb!=null){ y||RK`H
list.add(cb); _Q
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} u4SL:IH{D
} EUcD[Rv
} BPt? 3tC
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CountControl.java *w*>\ZhOm
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/* [yQ%g;m
* CountThread.java 9.M'FCd~M
* XJ3sqcS
* Created on 2007年1月1日, 下午4:57 breF,d$
* LAf#Rco4
* To change this template, choose Tools | Options and locate the template under O=}Rp1
* the Source Creation and Management node. Right-click the template and choose 1a{r1([)
* Open. You can then make changes to the template in the Source Editor. B^P&+,\[}
*/ &*+$38XE^
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package com.tot.count; h L [ eA
import tot.db.DBUtils; W>d)(
import java.sql.*; -#;xfJE
/** Z*mbhod
* !.mR]El{K
* @author 4l%W]'
*/ V27RK-.N!
public class CountControl{ S}%z0g<
private static long lastExecuteTime=0;//上次更新时间 -~~h1
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +@3+WD
/** Creates a new instance of CountThread */ si6CWsb_ f
public CountControl() {} yFDeYPZP
public synchronized void executeUpdate(){ Z)E)-2U$@
Connection conn=null; Gg9MAK\ C9
PreparedStatement ps=null; =cjO]
try{ ?=&S?p)-<
conn = DBUtils.getConnection(); vFR*3$R
conn.setAutoCommit(false); 4{zy)GE|W
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); |3,WiK='
for(int i=0;i<CountCache.list.size();i++){ IV. })8
CountBean cb=(CountBean)CountCache.list.getFirst(); ..u{v}4&
CountCache.list.removeFirst(); 9_:"`)]3B
ps.setInt(1, cb.getCountId()); f2IH2^)P
ps.executeUpdate();⑴ #vV]nI<MF.
//ps.addBatch();⑵ _(h=@cv
} ~>=.^
//int [] counts = ps.executeBatch();⑶ 5qQMGN$K
conn.commit(); vQi=13Pw
}catch(Exception e){ N?vb^?
e.printStackTrace(); 5<ruN11G
} finally{ YQG
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try{ Y#68_%[
if(ps!=null) { klm>/MXI`
ps.clearParameters(); >bZ-mX)j\0
ps.close(); ?}s;,_GH
ps=null; \/3(>g?4
} 5>f"
}catch(SQLException e){} [%dsq`b#
DBUtils.closeConnection(conn); fS4W*P[B3
} ktTP~7UVi
} aHW34e@ebL
public long getLast(){ \~,\|
return lastExecuteTime; e3;D1@
} \Yr*x7!
public void run(){ d%'#-w'
long now = System.currentTimeMillis(); |@JTSz*Or
if ((now - lastExecuteTime) > executeSep) { x0Loid\f
//System.out.print("lastExecuteTime:"+lastExecuteTime); zG ='U
//System.out.print(" now:"+now+"\n"); lF}@@e)N
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); <<MpeMi
lastExecuteTime=now; gp`@dn';
executeUpdate(); ;(`bP
} m1%rm-M
else{ Yt(FSb31H
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); E! NtD).=S
} mv8H:T
} Gr2}N"X=
} %BkE %ZcZ
//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 Pqya%j
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类写好了,下面是在JSP中如下调用。 0@zJa;z'
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<% (?1$
CountBean cb=new CountBean(); KZ7B2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ?tjEXg>ny
CountCache.add(cb); z U[pn)pe
out.print(CountCache.list.size()+"<br>"); (rBsh6@)
CountControl c=new CountControl(); Zio!j%G
c.run(); 1 gjaTPwY
out.print(CountCache.list.size()+"<br>"); :;eOhZ=_
%>