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: Jt<_zn_FG
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CountBean.java W\,s:6iqz
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/* {]!mrAjD
* CountData.java i#/Jr=
* {lDd.Fn
* Created on 2007年1月1日, 下午4:44 {4}yKjW%z
* pj{`';
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* To change this template, choose Tools | Options and locate the template under XEp{VC@=
* the Source Creation and Management node. Right-click the template and choose wssRA?9<
* Open. You can then make changes to the template in the Source Editor. 4he GnMD
*/ {6|G@""O
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package com.tot.count; u%KTNa0
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/** D/xbF`
* TER=*"!
* @author (t
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*/ 7IH@oMvE
public class CountBean {
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private String countType; kZ
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int countId; }'V5/>m[
/** Creates a new instance of CountData */ \ a<h/4#|
public CountBean() {} k,6f
public void setCountType(String countTypes){ jD]~ AwRJ
this.countType=countTypes; t#})Awy^R
} J?1 uKR
public void setCountId(int countIds){ ::lKL
this.countId=countIds; wu!59pL
} a2O75 kWnm
public String getCountType(){ bHYy }weZ
return countType; X/!o\yyT
} @f~RdO3
public int getCountId(){ wE>\7a*P%
return countId; iL&fgF"'
} 6r0krbN
} %D34/=(X
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CountCache.java TDKki(o=~
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/* ]i)c{y
* CountCache.java $y &E(J
* BwGfTua
* Created on 2007年1月1日, 下午5:01 (O?.)jEW(.
* =l;ewlU
* To change this template, choose Tools | Options and locate the template under faX#**r
* the Source Creation and Management node. Right-click the template and choose X1|njJGO1
* Open. You can then make changes to the template in the Source Editor. Jb@V}Ul$
*/ WIT>!|w_
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package com.tot.count; ,j{,h_Op
import java.util.*; ) 1f~ dR88
/** Q#X8u-~
* K~{$oD7!
* @author AaOuL,l
*/ `/XY>T}-
public class CountCache { :yr+vcD?
public static LinkedList list=new LinkedList(); Ad8n<zt|
/** Creates a new instance of CountCache */ wLH>:yKUU
public CountCache() {} bKY7/w<dP
public static void add(CountBean cb){ <n];mfh1
if(cb!=null){ }Yzco52
list.add(cb); )JLdO*H
} x%m%_2%Z
} Egp/f|y
} Y|f[bw
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CountControl.java Qf+\;@
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/* c
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* CountThread.java ?k&Vy
* SI-q C
* Created on 2007年1月1日, 下午4:57 )e+>w=t
* ^z IW+:
* To change this template, choose Tools | Options and locate the template under R6 .hA_ih
* the Source Creation and Management node. Right-click the template and choose C.yQ=\U2
* Open. You can then make changes to the template in the Source Editor. HGs $*
*/ @/.;Xw]
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package com.tot.count; f!uw zHA`?
import tot.db.DBUtils; TH&U
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import java.sql.*; s}9S8@#
/** Y-_`23x`
* R6Km\N
* @author m@2QnA[4
*/ wj^3N7_:w
public class CountControl{ nbD*x|
private static long lastExecuteTime=0;//上次更新时间 3vN_p$
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Eu d*_>|
/** Creates a new instance of CountThread */ /wEhVR`=
public CountControl() {} Ys!82M$g
public synchronized void executeUpdate(){ X::JV7hu
Connection conn=null; /sx&=[
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PreparedStatement ps=null; JN-y)L/>
try{ (AaoCa[
conn = DBUtils.getConnection(); %KlrSo
conn.setAutoCommit(false); x.!V^HQSN
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ZF9z~9
for(int i=0;i<CountCache.list.size();i++){ ]?kZni8j_
CountBean cb=(CountBean)CountCache.list.getFirst(); 2\MT;;ZTZ
CountCache.list.removeFirst(); {j?FNOJn
ps.setInt(1, cb.getCountId()); xQ-<WF1i
ps.executeUpdate();⑴ N1}sHyVq7
//ps.addBatch();⑵ u<tbbKM
} yy^q2P
//int [] counts = ps.executeBatch();⑶ '4+
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conn.commit(); -hGk?_Nqa/
}catch(Exception e){ :Uzm
e.printStackTrace(); M#4pE_G
} finally{ )9{0]u;9
try{ \^J%sf${
if(ps!=null) { (&F}/s gbi
ps.clearParameters(); XH 4
ps.close(); %+W{iu[|
ps=null; fP
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} }(J}f)
}catch(SQLException e){} ; ; OAQ`
DBUtils.closeConnection(conn); O>bC2;+s
} X1x#6
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} #4Rx]zW^%
public long getLast(){ TCwFPlF|
return lastExecuteTime; dk#k bG;
} ]___M
public void run(){ y1eWpPJa
long now = System.currentTimeMillis(); ~*&H$6NJS
if ((now - lastExecuteTime) > executeSep) { Ju!]&G8
//System.out.print("lastExecuteTime:"+lastExecuteTime); )
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//System.out.print(" now:"+now+"\n"); *e TqVG.
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); jjRi*^d9
lastExecuteTime=now; '6iEMg&3
executeUpdate(); P6'1.R
} jjB~G^n
else{ h,u,^ r
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); PB\(=
} `!;_ho
} gZ3u=uME
} Xv5wJlc!d
//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 D[[|")Fn
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类写好了,下面是在JSP中如下调用。 Pe_W;q.
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<% \R9(x]nZ%
CountBean cb=new CountBean(); z1 |TC
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); v!-/&}W)1
CountCache.add(cb); 36&e.3/#
out.print(CountCache.list.size()+"<br>"); [[Ls_ZL!=
CountControl c=new CountControl(); F3[T.sf
c.run(); ^+>laOzC`8
out.print(CountCache.list.size()+"<br>"); T\6dm/5
%>