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: 0'm$hU}
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CountBean.java Jr2x`^aNO
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/* +`jI z'+
* CountData.java ahJ-T@
* TTGk"2
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* Created on 2007年1月1日, 下午4:44 "Sx}7?8AB
* WC0gJy
* To change this template, choose Tools | Options and locate the template under Gz09#nFZk
* the Source Creation and Management node. Right-click the template and choose C6<*'5T
* Open. You can then make changes to the template in the Source Editor. ~%gO +qD
*/ SK][UxoHm
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package com.tot.count; /kZ{+4M
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/** ^jph"a C
* ioJ~k[T
* @author {:@MBA34
*/ ;pH&YBY
public class CountBean {
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private String countType; l( Y
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int countId; 4k7
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/** Creates a new instance of CountData */ fS@V`"O6
public CountBean() {} owR`Z`^h)
public void setCountType(String countTypes){ Uj/m
this.countType=countTypes; #saK8; tp
} ='rSB.$Ctk
public void setCountId(int countIds){ 7A,QA5G]C
this.countId=countIds; n8K FP
} S`w_q=-^8
public String getCountType(){ 9sQ#v-+Yx
return countType; E:7R>.g
} 6cQ)*,Q
public int getCountId(){ "J.7@\^ h/
return countId; 7NQ@q--3s
} ]'"aVGqa.
} 5u:{lcC.X
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CountCache.java /7`fg0A
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/* 1J{1>r
* CountCache.java $T#yxx
* UZ*Yt
* Created on 2007年1月1日, 下午5:01 *m>XtBw.
* jIvSjlm I
* To change this template, choose Tools | Options and locate the template under O,D/&0
* the Source Creation and Management node. Right-click the template and choose \c1NIuJR
* Open. You can then make changes to the template in the Source Editor. 178u4$# b
*/ :6T8\W
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package com.tot.count; iHYvH
import java.util.*; RX"~m!26
/** h=x{
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* TXH9BlDn
* @author g %e"K nU
*/ U
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public class CountCache { 3Yb2p!o
public static LinkedList list=new LinkedList(); ZH
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/** Creates a new instance of CountCache */ <T^:`p/]4
public CountCache() {} I\y=uC
public static void add(CountBean cb){
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if(cb!=null){ 9im<J'
list.add(cb); /c4@QbB
} o6b\
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} f3E%0cg
} o$XJSz|6
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CountControl.java WVMkLMg8d
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/* {K,KIj"
* CountThread.java P;8D|u^\*
* Shag4-*@hi
* Created on 2007年1月1日, 下午4:57 v:xfGA nP
* ^_0l(ke
* To change this template, choose Tools | Options and locate the template under Cju%CE3a
* the Source Creation and Management node. Right-click the template and choose Jx-dWfe
* Open. You can then make changes to the template in the Source Editor. ",Ge:\TR=
*/ uG:xd0X+W
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package com.tot.count; i0jR~vF
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import tot.db.DBUtils; QRw/d}8l
import java.sql.*; >cdxe3I\
/** \J?l7mG
* QE\t}>
* @author }
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*/ j~#nJI5]
public class CountControl{ YT@D*\
private static long lastExecuteTime=0;//上次更新时间 m1\+~*i
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ;Q{~jT
/** Creates a new instance of CountThread */ zEJZ, <
public CountControl() {} FHv^^u'@
public synchronized void executeUpdate(){ P_y8[Y]?
Connection conn=null; "4Bk
PreparedStatement ps=null; Y5&mJp\G
try{ o)U4RY*
conn = DBUtils.getConnection(); H%&e[PU
conn.setAutoCommit(false); 24; BY'
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); gQ8FjL6?
for(int i=0;i<CountCache.list.size();i++){ 4r+s"
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CountBean cb=(CountBean)CountCache.list.getFirst(); &X%vp?p
CountCache.list.removeFirst(); F-&=N {+
ps.setInt(1, cb.getCountId()); muZ6 }&4
ps.executeUpdate();⑴ !J/fJW>m6
//ps.addBatch();⑵ i^I
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} fEgwQ-]
//int [] counts = ps.executeBatch();⑶ c:OFBVZ
conn.commit(); cZFG~n/
}catch(Exception e){ 6 $*\%
e.printStackTrace(); =VFPZ
} finally{ ~MZEAY9
try{ *$6dN x
if(ps!=null) { wBaIN]Y,
ps.clearParameters(); dPx{9Y<FzU
ps.close(); PQJI~u9te}
ps=null; ='U>P(
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} na)-'
}catch(SQLException e){} EsK.g/d
DBUtils.closeConnection(conn); J =j6rD
} !$1'q~sO
} ?ZS/`P0}[
public long getLast(){ ]Lz:oV^%
return lastExecuteTime; 6.(L8.jv
} 4IUdlb
public void run(){ %+F%C=GqI
long now = System.currentTimeMillis(); Yfa` }hQ
if ((now - lastExecuteTime) > executeSep) { +yO^,{8SE
//System.out.print("lastExecuteTime:"+lastExecuteTime); dF#`_!4pbf
//System.out.print(" now:"+now+"\n"); #UYrSM@u
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); i7#PYt
lastExecuteTime=now; Q}qw`L1
executeUpdate(); 9=FqI50{
} q wd7vYBc,
else{ r}%2;!T
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); hP$v,"$
} xoQ;fVNp
} KO''B or
} J}M_Ka
//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 G-#]|)
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类写好了,下面是在JSP中如下调用。 :u4q.^&!e
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<% Kx<T;iJ}
CountBean cb=new CountBean(); <GRplkf`
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 8+=-!":]
CountCache.add(cb); QH]G>+LI5
out.print(CountCache.list.size()+"<br>"); vXUq[,8yf
CountControl c=new CountControl(); S9@2-Oc
c.run(); qbZY[Q+F
out.print(CountCache.list.size()+"<br>"); :3h'Hr
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