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: ~&8ag`
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CountBean.java N&n2\Y
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/* hosw :%
* CountData.java ?aR)dQ
* t:X\`.W
* Created on 2007年1月1日, 下午4:44 ]{;=<t6
* nSdta'6
* To change this template, choose Tools | Options and locate the template under x>TH yY[sq
* the Source Creation and Management node. Right-click the template and choose SRuNt3wW6
* Open. You can then make changes to the template in the Source Editor. BR;f!
*/ OsAH!e
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package com.tot.count; |}P4Gr}6
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/** $$_aHkI j
*
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* @author (P&~PJH
*/ -*t4(wT|j
public class CountBean { 794V(;sW,
private String countType; g&I/ b/A
int countId; [xXa3W
/** Creates a new instance of CountData */ ="hh=x.5J
public CountBean() {} fS+Ga1CsH
public void setCountType(String countTypes){ =QXLr+
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this.countType=countTypes; bq{":[a
} U2l7@uDr;
public void setCountId(int countIds){ "$#X[.
this.countId=countIds; ]c%yib
} })f4`$qf
public String getCountType(){ B/u0^!
return countType; JFf*v6:,
} @5jJoy(mX@
public int getCountId(){ ]Ng K(IU
return countId; g(){wCI
} |d =1|C%,
} o\6A]T=R
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CountCache.java x@/ N9*
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/* No#1Ik w
* CountCache.java ,5J-C!C
* rjqQWfShY
* Created on 2007年1月1日, 下午5:01 X+2 aP'D
* B@XnHh5y
* To change this template, choose Tools | Options and locate the template under ocOzQ13@Y
* the Source Creation and Management node. Right-click the template and choose }+ ";W) R
* Open. You can then make changes to the template in the Source Editor. /cM<
*/ S?_/Po|
*[K\_F?^h
package com.tot.count; Ct2m l
import java.util.*; IO3`/R-
/** NGZEUtj
* R+,eX jz"
* @author m:U.ao6
*/ gw[\7
public class CountCache { `@?f@p$(B
public static LinkedList list=new LinkedList(); <,/k"Y=
/** Creates a new instance of CountCache */ 9ReH@5_bGM
public CountCache() {} Sz4G,c
public static void add(CountBean cb){ (s`oJLW>
if(cb!=null){ P6q`i<
list.add(cb); I!'PvIyO
} AfAg#75q
} {v{qPYNyh
} wc@X:${
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CountControl.java |KEq-
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/* ?z,^QjQ}
* CountThread.java IRy!8A=X
* fT9z 4[M
* Created on 2007年1月1日, 下午4:57 uLFnuK
* rz/^_dV
* To change this template, choose Tools | Options and locate the template under A0Z<1|6r*
* the Source Creation and Management node. Right-click the template and choose N0APX4j
* Open. You can then make changes to the template in the Source Editor. 1NJ,If]
*/ [4Tiukk(
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package com.tot.count; mY[s2t
import tot.db.DBUtils; `-qRZh@ E
import java.sql.*; ACQbw)tiv}
/** OT-!n
* m=;0NLs4
* @author Mle@.IIT
*/ oJ|8~:)
public class CountControl{ (Ic{C5'
private static long lastExecuteTime=0;//上次更新时间 %tx~CD
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ?M2#fD]e
/** Creates a new instance of CountThread */ !&4<"wQ
public CountControl() {} "XQj~L
public synchronized void executeUpdate(){ }<?1\k
Connection conn=null; 9nW/pv
PreparedStatement ps=null; 1e=<df
try{ xDtq@Rb}
conn = DBUtils.getConnection(); =apcMW(zn
conn.setAutoCommit(false); #H]b Xr
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); g
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for(int i=0;i<CountCache.list.size();i++){ Q.SLiI
CountBean cb=(CountBean)CountCache.list.getFirst(); 8j~:p!@
CountCache.list.removeFirst(); +)8,$1[p|
ps.setInt(1, cb.getCountId()); jY^wqQls
ps.executeUpdate();⑴ 88c-K{}3
//ps.addBatch();⑵ 2de[ yz
} 3a#X:?
//int [] counts = ps.executeBatch();⑶ fwvPh&U&
conn.commit(); &n:3n
}catch(Exception e){ r2:n
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e.printStackTrace(); Ec!fx\
} finally{ GS),rNBur
try{ > Y7nq\
if(ps!=null) { BLc&q)
ps.clearParameters(); B_;W!
ps.close(); BI9~%dm
ps=null; 77y_?di^I
} o80?B~o
}catch(SQLException e){} +RIG8w]
DBUtils.closeConnection(conn); ziFg+i%s
} B^4D`0G[4
} Yt^<^l77D
public long getLast(){ ym*,X@Qg^
return lastExecuteTime; (#zSVtZ
} Rx';P/F0C
public void run(){ R7'a/
long now = System.currentTimeMillis(); Vp3r
if ((now - lastExecuteTime) > executeSep) { |Ld/{&Qr
//System.out.print("lastExecuteTime:"+lastExecuteTime); vfb~S~|U6g
//System.out.print(" now:"+now+"\n"); B(}u:[
b^S
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); i1ph{;C
lastExecuteTime=now; &V.ps1
executeUpdate(); F_8<
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} Ie 3
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else{ 8J60+2Wa
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 45cMG~]p
} +h!OdWD9
} jVh I`F{n
} {/f\lS.5g
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 FmU>q)
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类写好了,下面是在JSP中如下调用。 B o@B9/ABv
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<% UzLe#3MU
CountBean cb=new CountBean(); hAHZN^x&
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); X^L)5n+$X
CountCache.add(cb); z$'_ =9yZ
out.print(CountCache.list.size()+"<br>"); ZY%]F,Y
CountControl c=new CountControl(); :mwNkT2et
c.run(); qw]:oh&G
out.print(CountCache.list.size()+"<br>"); ,~;_-
%>