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: ciGJtD&P
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CountBean.java U6F1QLSLz
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/* i6 )HC
* CountData.java C@{-$z)
* {fa3"k_ke
* Created on 2007年1月1日, 下午4:44 52t6_!y+V
* t4Pi <m:7
* To change this template, choose Tools | Options and locate the template under DhD^w;f]
* the Source Creation and Management node. Right-click the template and choose M.\V/OX
* Open. You can then make changes to the template in the Source Editor. I`;SA~5
*/ #jM-XK
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package com.tot.count; il% u)NN
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/** pD;fFLvN
* `k`P;(:
* @author 2]=`^rC*
*/ %S/?Ci
public class CountBean { ym_p49
private String countType; Z): Nd9
int countId; S? #6{rx
/** Creates a new instance of CountData */ 0+F--E4
public CountBean() {} n
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public void setCountType(String countTypes){ UCJx{7
this.countType=countTypes; \3`r/,wY
} bE?X?[K
public void setCountId(int countIds){ wKKQAM6P1
this.countId=countIds; xZA.<Yd^r
} JJK-+a6cX
public String getCountType(){ Ll.P>LH
return countType; ty'/i!/\
} /xj`'8
public int getCountId(){ +QNsI2t;r
return countId; L~AU4Q0o
} 9g]%}+D
} o59b#9
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CountCache.java F^81?Fi.
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/* Jj?HOtaM
* CountCache.java Ph8@V}80"Y
* 4w)>}
* Created on 2007年1月1日, 下午5:01 yD#(Iw
* eph2&)D}Ep
* To change this template, choose Tools | Options and locate the template under PQp/&D4K
* the Source Creation and Management node. Right-click the template and choose =#=}|Q}
* Open. You can then make changes to the template in the Source Editor. LosRjvQ:
*/ X9ZHYlr+Q
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package com.tot.count; c0Pj})-
import java.util.*; hQ'W7EF
/** u`D _
* u /]P
* @author *jvP4Nz)k
*/ "blq)qo)
public class CountCache { 4EmdQn
public static LinkedList list=new LinkedList(); b3F KDm[
/** Creates a new instance of CountCache */ b
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public CountCache() {} r8?p6E
public static void add(CountBean cb){ 9!FU,4 X
if(cb!=null){ 6VVxpDAi:
list.add(cb); L_aqr?Q
} 7'"qW"<
} ]tf`[bINP
} dNhbvzl(
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CountControl.java OTE,OCB[
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/* 0G6aF"
* CountThread.java >KL=(3:":p
* Xdx8HB@L
* Created on 2007年1月1日, 下午4:57 T~k @Z
* 3UaW+@
* To change this template, choose Tools | Options and locate the template under A]TEs)#*7)
* the Source Creation and Management node. Right-click the template and choose /]^Y\U ^
* Open. You can then make changes to the template in the Source Editor. }Nd1'BVf
*/ 57EX#:a
e5 L_<V^Jo
package com.tot.count; &+&@;2
import tot.db.DBUtils; q&J5(9]O|L
import java.sql.*; FR[I~unqD
/** ?&-1(&
* IdN3Ea]
* @author ,dR.Sacv
*/ u*):
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public class CountControl{ c8YbBdk'
private static long lastExecuteTime=0;//上次更新时间 /AADFa
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 tT>LOI_z
/** Creates a new instance of CountThread */ C1e@{>
public CountControl() {} NXFi*
public synchronized void executeUpdate(){ r
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Connection conn=null; [K$5Rm5
PreparedStatement ps=null; NS2vA>n8R
try{ z4Zm%
conn = DBUtils.getConnection(); N|$9v{ j_
conn.setAutoCommit(false); w~)tEN>
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 5{k,/Z[L
for(int i=0;i<CountCache.list.size();i++){ :>JfBJ]|
CountBean cb=(CountBean)CountCache.list.getFirst(); ~qj(&[U{c\
CountCache.list.removeFirst(); O*GF/ R8B
ps.setInt(1, cb.getCountId()); ^n0;Q$\
ps.executeUpdate();⑴ y;Cs#eo
//ps.addBatch();⑵ n
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} (87| :{
//int [] counts = ps.executeBatch();⑶ ! e$ZOYe
conn.commit(); #i@f%Bq-
}catch(Exception e){ U,#x\[3!Jt
e.printStackTrace(); lbda/Zx
} finally{ ~q}L13^k
try{ Z8ea)_{#
if(ps!=null) { `
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ps.clearParameters(); qsp.`9!
ps.close(); Hvm}@3F|
ps=null; 0>Snps3*Z
} <`uu e
}catch(SQLException e){} @6yc^DAA
DBUtils.closeConnection(conn); } 7
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} &|{1Ws
} I?}jf?!oM
public long getLast(){ MGm*({%
return lastExecuteTime; Bk~C$'x4
} \)No?fB
public void run(){ ?'TK~,dG/
long now = System.currentTimeMillis(); ]6^<VC`5D
if ((now - lastExecuteTime) > executeSep) { dgpE3
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//System.out.print("lastExecuteTime:"+lastExecuteTime); ESRj<p%W
//System.out.print(" now:"+now+"\n"); U_"!\lI_yg
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ud`-w
lastExecuteTime=now; '_G\_h}5
executeUpdate(); RH;ulAD6(~
} %m
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else{ :,0(aB
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 6P{^j
} 6i[Ts0H%<!
} Q
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} -{cmi,oy
//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 6/8K2_UeoW
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类写好了,下面是在JSP中如下调用。 OKMdyyO<l
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<% .Z[4:TS
CountBean cb=new CountBean(); tr<fii3<
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); T ?[28|
CountCache.add(cb); ~JXz
out.print(CountCache.list.size()+"<br>"); cb9-~*1
CountControl c=new CountControl(); 754MQK|g
c.run(); n>ui'}L
out.print(CountCache.list.size()+"<br>"); }#ZRi}f2VJ
%>