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: ]|ag
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CountBean.java Uz8ff
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/* $GcqBg-Hi
* CountData.java @n /nH?L
* LL |r
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* Created on 2007年1月1日, 下午4:44 "|q&ea rc
* &h)yro
* To change this template, choose Tools | Options and locate the template under hWLA<wdb
* the Source Creation and Management node. Right-click the template and choose ZvX*t)VjTz
* Open. You can then make changes to the template in the Source Editor. 8/cX]J
*/ Gj?t_Zln
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package com.tot.count; cwlRQzQ(
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/** 4E+e}\r:6
* /C:gKy4
* @author pYEMmZ?L
*/ gZXi]m&
public class CountBean { lrE5^;/s1
private String countType; JyK3{wYS
int countId; I$G['`XX/
/** Creates a new instance of CountData */ V2EUW!gn
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public CountBean() {} +3BN}
public void setCountType(String countTypes){ 'JE`(xD
this.countType=countTypes; C.-,^+t;g
} Gb6 'n$g
public void setCountId(int countIds){ O=t_yy
this.countId=countIds; >Cp0.A:UC#
} 9W5lSX#^;
public String getCountType(){ v{4$D~I
return countType; ;igIZ$&
} H%tdhu\e
public int getCountId(){ Z5n1@a__
return countId; 9.-S(ZO
} ? OM!+O
} %sP*=5?vA
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CountCache.java }($5k]]clP
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/* C}Cs8eUn
* CountCache.java !e<^?
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* 7n<{tM
* Created on 2007年1月1日, 下午5:01 .L~AL|2_
* Zu[su>\
* To change this template, choose Tools | Options and locate the template under ES7s1O$#
* the Source Creation and Management node. Right-click the template and choose rM%1GPVob
* Open. You can then make changes to the template in the Source Editor. 1GcE)e!>
*/ g!|kp?
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package com.tot.count; rb.N~
import java.util.*; !F$6-0%
/** r,p%U!S<hV
* 8nV+e~-w
* @author 24eLB?H
*/ )ez9"# MH'
public class CountCache { <bWG!ZG
public static LinkedList list=new LinkedList(); PJH&
/** Creates a new instance of CountCache */ Z FL~;_r
public CountCache() {} :$c
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public static void add(CountBean cb){ qX{+oy5
if(cb!=null){ %h!B^{0
list.add(cb); UCj ld
} Q![@c
} e\L8oOk#r
} 6i/(5 nQ
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CountControl.java b\2
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/* 3!]rmZ-W
* CountThread.java Km$\:Xo
* JWxwJex
* Created on 2007年1月1日, 下午4:57 R6->t #n,
* P&Vv/D
* To change this template, choose Tools | Options and locate the template under 6'f;-2
* the Source Creation and Management node. Right-click the template and choose O=7CMbS3
* Open. You can then make changes to the template in the Source Editor. 0g8NHkM:2a
*/ 3JR+O<3D
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package com.tot.count; "w<#^d_6
import tot.db.DBUtils; 9pfIzs
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import java.sql.*; (E1~H0^
/** 'I;zJ`Trd
* v]UwJz3<
* @author ");a3hD
*/ a%0EiU
public class CountControl{ VIf.q)_k
private static long lastExecuteTime=0;//上次更新时间 t]G:L}AOl
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 N;%6:I./
/** Creates a new instance of CountThread */ seJ^s@H5l
public CountControl() {} JucY[`|JV
public synchronized void executeUpdate(){ jPkn[W#
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Connection conn=null; \9EjClfo
PreparedStatement ps=null; J'r^/
try{ |R:'\+E
conn = DBUtils.getConnection(); qH_Dc=~la
conn.setAutoCommit(false); WNc0W>*NE1
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); BZ^}J!Q'*
for(int i=0;i<CountCache.list.size();i++){ .=;
;
CountBean cb=(CountBean)CountCache.list.getFirst(); (/]
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CountCache.list.removeFirst(); K*d Cc}:`
ps.setInt(1, cb.getCountId()); 7G],T++N
ps.executeUpdate();⑴ %;!.n{X
//ps.addBatch();⑵ [2cD:JL
} V=3b&TkE
//int [] counts = ps.executeBatch();⑶ q@2siI~W
conn.commit(); EoDA]6?Lj
}catch(Exception e){ ?aMOZn?
e.printStackTrace(); c:.eGH_f
} finally{ Wc
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try{ cB&:z)i4
if(ps!=null) { 1h5 Akq
ps.clearParameters(); "kF g
ps.close(); |ENh)M8}r
ps=null; x,V r=FB
} (7*}-Uy[C
}catch(SQLException e){} =vhm}
DBUtils.closeConnection(conn); @KAI4LP
} Z?z.?ar
} :BTq!>s
public long getLast(){ {(}By/_
return lastExecuteTime; ml$o5&sN
} ?bu>r=oIO]
public void run(){ Wm5dk9&x
long now = System.currentTimeMillis(); HpnWoDM
if ((now - lastExecuteTime) > executeSep) { Rx}Gz$
//System.out.print("lastExecuteTime:"+lastExecuteTime); #LOwGJ$yVz
//System.out.print(" now:"+now+"\n"); Na Cy@
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); n'w.;
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lastExecuteTime=now; ;A!BVq
executeUpdate(); v*yuE5{
} 8dyg1F
else{ @\I#^X5lv
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); mj@13$=
} *uvQ\.
} {1
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} 7=, ; h
//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 29q _BR *:
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类写好了,下面是在JSP中如下调用。 C"enpc_C/
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<% tklH@'q
CountBean cb=new CountBean(); ws^ np
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 'A[dCc8O
CountCache.add(cb); pY$Q
out.print(CountCache.list.size()+"<br>"); OK
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CountControl c=new CountControl(); RzusNS
c.run(); ei5~&
out.print(CountCache.list.size()+"<br>"); uRe'%?W
%>