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: :sXn*k4v
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CountBean.java o-%DL*^5
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/* G,JNUok
* CountData.java x9VR>ux&
* 8!u8ZvbFG
* Created on 2007年1月1日, 下午4:44 T_b$8GYfCY
* Dg2=;)"L
* To change this template, choose Tools | Options and locate the template under khtYn.eaL
* the Source Creation and Management node. Right-click the template and choose \t\ZyPxn
* Open. You can then make changes to the template in the Source Editor. V.Ki$0>
*/ O%?d0K
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package com.tot.count; 0*}%v:uN9
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/** x6={)tj
* !`?*zf
* @author 6l-V%3-
*/ *T{P^q.s~[
public class CountBean { .YcI .
private String countType; 86N"EuH$
int countId; x7l3&;yDv
/** Creates a new instance of CountData */ yUzpl[*e^o
public CountBean() {} 1lLL9l{UVw
public void setCountType(String countTypes){ 0413K_
this.countType=countTypes; MC&sM-/
} ;OynkZs)
public void setCountId(int countIds){ *%wfR7G[B
this.countId=countIds; sM$gfFx
} l2LUcI$ x
public String getCountType(){ aL%amL6CX
return countType; Y>i?nC%*
} 0755;26Bx
public int getCountId(){ WN%KATA
return countId; C|W\qXCqu
} ^%pM$3ov
} &?mJL0fy
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CountCache.java L+o"<LV]
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/* G 0;5I_D/
* CountCache.java dy%#E2f
* Ysz&/ry
* Created on 2007年1月1日, 下午5:01 ApxGrCu
* lYq4f|5H}m
* To change this template, choose Tools | Options and locate the template under s9'lw'
* the Source Creation and Management node. Right-click the template and choose OPsg3pW!]
* Open. You can then make changes to the template in the Source Editor. kxp, ZP
*/ W{!GL
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package com.tot.count; 8DsXw@o
import java.util.*; _H+|Ic
/** 5VG[FY6Pl
* #A '|O\RGP
* @author U,w J8
*/ s]z-d!G
public class CountCache { SsE8;IGH
public static LinkedList list=new LinkedList(); 39(]UO6^;
/** Creates a new instance of CountCache */ "\9!9U#!
public CountCache() {} d!i#@XZ^
public static void add(CountBean cb){ -0/5!
if(cb!=null){ DL0i
list.add(cb); J<4egk4
} oSOO5dk:z
} xF4>D!T%8
} tgP x!5U
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CountControl.java {:;599l
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/* ;Xw'WMb*=
* CountThread.java "+6:vhP5
* W+C@(}pt
* Created on 2007年1月1日, 下午4:57 "V;5Lp b
* feH|sz`e
* To change this template, choose Tools | Options and locate the template under }Ra'`;D$
* the Source Creation and Management node. Right-click the template and choose 1k
*gbXb
* Open. You can then make changes to the template in the Source Editor. Uz`K#Bz
*/ N BUSr}8|
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package com.tot.count; 3.
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import tot.db.DBUtils; gfPht 5
import java.sql.*; -!k$ Z
/** g{}{gBplnl
* DKG%z~R*
* @author ?{OB+f}Mo
*/ A@kp`-
public class CountControl{ u::2c
private static long lastExecuteTime=0;//上次更新时间 "XEKoeG{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒
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/** Creates a new instance of CountThread */ 61W
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public CountControl() {} < c}cgD4
public synchronized void executeUpdate(){ v&NC` dVR
Connection conn=null; P sLMV:O9S
PreparedStatement ps=null; v ;q<h
try{ 8Q%rBl.
conn = DBUtils.getConnection(); .UUY9@
conn.setAutoCommit(false); 0?tn.<'B8T
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J4Ix\r_
for(int i=0;i<CountCache.list.size();i++){ c<`Z[EY(t
CountBean cb=(CountBean)CountCache.list.getFirst(); -Tw96 dv
CountCache.list.removeFirst(); #Tjv(O[&
ps.setInt(1, cb.getCountId()); %)Pn<! L
ps.executeUpdate();⑴
[=63xPxs.
//ps.addBatch();⑵ }T}9AQ}|
} <9]9;
//int [] counts = ps.executeBatch();⑶ 8KQ]3Z9p
conn.commit(); us2X:X)
}catch(Exception e){ 'n9<z)/,!
e.printStackTrace(); u7oHqo`
} finally{ dsx'l0q 'i
try{ VZ`L-P$AF
if(ps!=null) { I?l%RdGW
ps.clearParameters(); Jv|uI1V
ps.close(); F3aOKV^
ps=null; a5v}w7vL
} {g:I5
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}catch(SQLException e){} ndIf1}
DBUtils.closeConnection(conn); =Mb1)^m
} bvf}r
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} )jh4HMvmC
public long getLast(){ &:i|;^^2
return lastExecuteTime; "gcHcboU5$
} W3XVr&
public void run(){ aIrQ=}
long now = System.currentTimeMillis(); 1mLd_]F'F
if ((now - lastExecuteTime) > executeSep) { cH&-/|N
//System.out.print("lastExecuteTime:"+lastExecuteTime); t4a/\{/#9|
//System.out.print(" now:"+now+"\n"); #+vIq?
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); RJo"yB$1e6
lastExecuteTime=now; ~VRt6C
executeUpdate(); j{i3lGaN
} 7gL N7_2
else{ :
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); V'XmMn)!
} I.f)rMl+h
} +J^-B}v
} z$VA]tI(
//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 *?zyF@K{%
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类写好了,下面是在JSP中如下调用。 BI'}
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<% IA\CBwiLj
CountBean cb=new CountBean(); Mpfdl65
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); S1iF1X(+?X
CountCache.add(cb); Q-3o k7
out.print(CountCache.list.size()+"<br>"); h}X^
CountControl c=new CountControl(); U#I8Rd I,
c.run(); p7UdZOi2
out.print(CountCache.list.size()+"<br>"); 03F%!Rm/j
%>