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: \r1kbf7?
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CountBean.java f3%^-Uy*b
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/* >TQBRA;'
* CountData.java N.Wdi
* &ttv4BC^r
* Created on 2007年1月1日, 下午4:44 i?i7T`
* 4/-))F&s
* To change this template, choose Tools | Options and locate the template under 3Q!J9t5dc
* the Source Creation and Management node. Right-click the template and choose YKX>@)Dxv
* Open. You can then make changes to the template in the Source Editor. HN~v&,
*/ KWn1 %oGJ
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package com.tot.count; -'p@ lk
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/** *n|0\V<
* 5qtmb4R~
* @author &T|&D[@
*/ 'Kso@St`o
public class CountBean { h<^:Nn
private String countType; u6S0t?Udap
int countId; |q.:hWYFpM
/** Creates a new instance of CountData */ r~D~7MNl
public CountBean() {} sY;gh`4h
public void setCountType(String countTypes){ fj
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this.countType=countTypes; ,O&PLr8cJ?
} gt t$O
public void setCountId(int countIds){ )T};Q:
this.countId=countIds; +^&v5[$R
} mTuB*
public String getCountType(){ c!u}KVH
return countType; :2UC{_
} Uh|__DUkh
public int getCountId(){ M6hvi(!X2
return countId; 4{pemqS*
} >K|G LP
} HT,kx
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CountCache.java cVHE}0Xd(
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/* )x:j5{>(
* CountCache.java Z/05 wB
* "k1Tsd-
* Created on 2007年1月1日, 下午5:01 ox=7N{+`J
* n40MP5RxY
* To change this template, choose Tools | Options and locate the template under AIxBZt7{b
* the Source Creation and Management node. Right-click the template and choose PSQ:'
* Open. You can then make changes to the template in the Source Editor. f~" V
*/ cV_IG}LJ
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package com.tot.count; FPUR0myCU
import java.util.*; }B
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/** kdMS"iN8x
* hC,-9c
* @author 4d._Hd='
*/ Is6']bYh
public class CountCache { :6k DUFj}
public static LinkedList list=new LinkedList(); oJJk
/** Creates a new instance of CountCache */ %FWfiFV|<
public CountCache() {} .yfqS|(
public static void add(CountBean cb){ =U7D}n
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if(cb!=null){ rUpAiZfz >
list.add(cb); kq.h\[
} &aAo:pj
} #M^Yh?~%w
} c)!s[o L
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CountControl.java $~@096`QL<
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/* {i}Q}OgYq
* CountThread.java wYMX1=
* @gjdyz
* Created on 2007年1月1日, 下午4:57
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* RowiSW
* To change this template, choose Tools | Options and locate the template under ^t
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* the Source Creation and Management node. Right-click the template and choose RrpFi'R
* Open. You can then make changes to the template in the Source Editor. R|$`MX}'z
*/ u&_U
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package com.tot.count; %e<dV\x?T
import tot.db.DBUtils; LqsJHG
import java.sql.*; (4f9wrK
/** Y <k,E
*
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* @author &FF. Ddt{
*/ w]-iM
public class CountControl{ Jo$Dxa
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private static long lastExecuteTime=0;//上次更新时间 ,wo"(E!4e
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 UBHQzc+,
/** Creates a new instance of CountThread */
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public CountControl() {} bCe-0!Q
public synchronized void executeUpdate(){ _:p_#3s$
Connection conn=null; X@q1;J
PreparedStatement ps=null; p}7&x[fTLk
try{ l{o{=]x1
conn = DBUtils.getConnection(); Byj~\QMD|
conn.setAutoCommit(false); c+/C7C o
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Z|S7",
for(int i=0;i<CountCache.list.size();i++){ "]V|bz o0a
CountBean cb=(CountBean)CountCache.list.getFirst(); j$oZIV7
CountCache.list.removeFirst(); Y mjS!H
ps.setInt(1, cb.getCountId()); O~'yP@&`
ps.executeUpdate();⑴ N`6|Y
//ps.addBatch();⑵ m e{SVG{
} FNEmGz/4
//int [] counts = ps.executeBatch();⑶ 4H)"d
conn.commit();
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}catch(Exception e){ wx5*!^&j
e.printStackTrace(); 7zZ|=W?&{
} finally{ M?zAkHNS$
try{ ^(vd8 &71
if(ps!=null) { S]=Vr%irX
ps.clearParameters(); 1tz .e\
ps.close(); R_n-&d'PP
ps=null; MXV4bgltT
} r/L]uSN
}catch(SQLException e){} ++"PPbOe&D
DBUtils.closeConnection(conn); }*R6p?L5
} C
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} PzDgl6C
public long getLast(){ D +""o"%
return lastExecuteTime; Vnb#N4vR
} In
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public void run(){ *G41%uz
long now = System.currentTimeMillis(); rapca'
if ((now - lastExecuteTime) > executeSep) { lXKZNCL
//System.out.print("lastExecuteTime:"+lastExecuteTime); >;W(Jb7e
//System.out.print(" now:"+now+"\n"); ;g]+MLV9
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ,m]q+7E
lastExecuteTime=now; wwn}enEz,x
executeUpdate(); 'Sh5W%NM
} jMbK7
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else{ *$D-6}Oay
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); nTKfwIeg5
} c.v)M\:
} +KNr1rG
} \]%U?`A
//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 Q~_x%KN/`
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类写好了,下面是在JSP中如下调用。 #KW:OFT
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<% fif<[Ax
CountBean cb=new CountBean(); Z-(HDn
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 063;D+
CountCache.add(cb); 4PQWdPv;
out.print(CountCache.list.size()+"<br>"); 2_X0Og8s[
CountControl c=new CountControl(); y9)",G!
c.run(); `l"~"x^Rr
out.print(CountCache.list.size()+"<br>"); 8F1!9W7
%>