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: 7P<f(@0h$E
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CountBean.java h x&"f e
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/* ,}&TZkN{-
* CountData.java v@tEHRadz
* gT0yI;g]
* Created on 2007年1月1日, 下午4:44 :;.^r,QAI
* D\b$$z]q
* To change this template, choose Tools | Options and locate the template under Er%&y
* the Source Creation and Management node. Right-click the template and choose )ds]fvMW]N
* Open. You can then make changes to the template in the Source Editor. r'j88)^
*/ 2H}y1bkW
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package com.tot.count; z4Zm%
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/** ;b*qunJ3L
* fs 2MYat
* @author tiE|%jOzt
*/ 5{k,/Z[L
public class CountBean { iuGwc086
private String countType; x<M::")5!V
int countId; wpuK?fP
/** Creates a new instance of CountData */ aqN{@|
public CountBean() {} \OtreYi
public void setCountType(String countTypes){ bf0,3~G,P
this.countType=countTypes; o+&Om~W
} JR#4{P@A
public void setCountId(int countIds){ ,wes*
this.countId=countIds; #55:qc>m
} <O
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public String getCountType(){ Rlk3AWl2u
return countType; >fzyD(>
}
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public int getCountId(){ OyVP_Yx,V
return countId; Lo1ySLo$G
} MGsQF #6]
} 05R"/r*
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CountCache.java H" `'d
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/* )gdLb}
* CountCache.java zUL,~u
* QF/_?Tm4
* Created on 2007年1月1日, 下午5:01 zP%s] >hH
* gAWi&
* To change this template, choose Tools | Options and locate the template under XJ\R'?j
* the Source Creation and Management node. Right-click the template and choose 3?a`@C&x
* Open. You can then make changes to the template in the Source Editor. 9>w~B|/
*/ 3\@2!:>
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package com.tot.count; olv?$]
import java.util.*; iW(LD1~7
/** `!Z?F]):G
* <`uu e
* @author [oVM9Q
*/
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public class CountCache { zp;!HP;/=
public static LinkedList list=new LinkedList(); 1*u]v{JJ(
/** Creates a new instance of CountCache */ 7Dbm
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public CountCache() {} ]|tg`*l!>
public static void add(CountBean cb){ Cjr]l!
if(cb!=null){ I U"
list.add(cb); O'wmhLa"W
} bpwA|H%{M
} O|,9EOrP
} p?y2j
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CountControl.java ")Not$8
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/* 'JMW.;Lh?X
* CountThread.java yO1
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* g,._3.D
* Created on 2007年1月1日, 下午4:57 YUEyGhkMV{
* ESRj<p%W
* To change this template, choose Tools | Options and locate the template under &~P4yI;,
* the Source Creation and Management node. Right-click the template and choose 1OMXg=Y
* Open. You can then make changes to the template in the Source Editor. Gy/w #4xj
*/ uKP4ur@1
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package com.tot.count; \uOM,98xS
import tot.db.DBUtils; '_G\_h}5
import java.sql.*; q k^FyZ<
/** I;t@wbY,
* tJ6@Ot
* @author J;>epM;*
*/ CVa>5vt
public class CountControl{ d#0:U
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private static long lastExecuteTime=0;//上次更新时间 z9ADF(J?0'
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]@Zv94Z(
/** Creates a new instance of CountThread */ 6i[Ts0H%<!
public CountControl() {} >N Bc-DX^
public synchronized void executeUpdate(){ 'NlhLu
Connection conn=null; nU>P%|loXx
PreparedStatement ps=null; pNb2t/8%%
try{ Sk|e#{
conn = DBUtils.getConnection(); HJAiQ[m5s
conn.setAutoCommit(false); 0qJ (RB
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); :>fT=$i@
for(int i=0;i<CountCache.list.size();i++){ OKMdyyO<l
CountBean cb=(CountBean)CountCache.list.getFirst(); sr6BC.
CountCache.list.removeFirst(); {h+8^
ps.setInt(1, cb.getCountId()); Y.Zd_,qy
ps.executeUpdate();⑴ c9-$^yno
//ps.addBatch();⑵ <l5i%?
} =tP9n ;D
//int [] counts = ps.executeBatch();⑶ nv:Qd\UM
conn.commit(); v]V N'Hs?
}catch(Exception e){ k\ #;
e.printStackTrace(); RJWO h
} finally{ H:c5
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try{ 9i5?J ]o^
if(ps!=null) { (lM,'
ps.clearParameters(); X
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ps.close(); 9S|sTf
ps=null; \ZLi Y
} :0l+x0l}
}catch(SQLException e){} *2X~NJCt
DBUtils.closeConnection(conn); 3
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} o0R?vnA=
} ur}'Y^0iR
public long getLast(){
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return lastExecuteTime; ?@G s7'
} ,>-D xS
public void run(){ blgA`)GI
long now = System.currentTimeMillis(); 27D*FItc
if ((now - lastExecuteTime) > executeSep) { g3$'Ghf
//System.out.print("lastExecuteTime:"+lastExecuteTime); !{jw!bB
//System.out.print(" now:"+now+"\n"); [Y](Y3 /.N
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); )*BZo>"
lastExecuteTime=now; @JbxGi
executeUpdate(); C(XV
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} $t;:"i>
else{ :8)Jnh\5
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 'v]0;~\mp>
} $NVVurXa
} YcobK#c
} t<8)h8eW
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 WoZU} T-
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类写好了,下面是在JSP中如下调用。 j?N<40z
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<% h =A
CountBean cb=new CountBean(); "bhK%N;
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Nnh\FaI
CountCache.add(cb); NuQ!huh
out.print(CountCache.list.size()+"<br>"); s>J5.Z7"'j
CountControl c=new CountControl(); -MTk9<qnT
c.run(); F$as#.7FF
out.print(CountCache.list.size()+"<br>"); X
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