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: 4# PxJG6m
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CountBean.java <F(S_w62
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/* Ow*va\0
* CountData.java 5'eBeNxM
* bhGRD{=
* Created on 2007年1月1日, 下午4:44 _/z_
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*
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* To change this template, choose Tools | Options and locate the template under sT"ICooc
* the Source Creation and Management node. Right-click the template and choose TIZ2'q5wg
* Open. You can then make changes to the template in the Source Editor. 4r`I)
*/ u:lBFVqk
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package com.tot.count; $~G5s<r
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/** iN.
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* qD4s?j-9
* @author ~?Vo d|>
*/ E0Q6Ryn
public class CountBean { auc:|?H~1n
private String countType; R6BbkYWrX
int countId; #^r-D[/m
/** Creates a new instance of CountData */ [8UZ5_1W L
public CountBean() {} 0 K#|11r
public void setCountType(String countTypes){ C3Q #[
this.countType=countTypes; @'}2xw[eU
} ]7cciob
public void setCountId(int countIds){ .%{B=_7
this.countId=countIds; ?4U4o<
} S*=^I2;
public String getCountType(){ LdH1sHy*d`
return countType; S9P({iZK
} oJ
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public int getCountId(){ >qB`03>
return countId; ULxQyY;32
} =DfI^$Lr:
} yna!L@ *@,
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CountCache.java fo+s+Q|Y
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/* "i(f+N,)
* CountCache.java d@g2 9rs
* MymsDdQ]
* Created on 2007年1月1日, 下午5:01 [n| }>
* lY"l6.c
* To change this template, choose Tools | Options and locate the template under zHz>Gc
* the Source Creation and Management node. Right-click the template and choose 5hy7}*dR
* Open. You can then make changes to the template in the Source Editor. T@.+bD
*/ ;"0bVs`.^e
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package com.tot.count; C_/eNu\I
import java.util.*; ?i0+h7=6
/** MYvz%7
* :*,!gf
* @author *5BVL_:~J
*/ Bj2iYk_cLa
public class CountCache { g2TK(S|#
public static LinkedList list=new LinkedList(); 0@b<?Ms9
/** Creates a new instance of CountCache */ Mn/
public CountCache() {} ^_Lnqk6
public static void add(CountBean cb){ yN{**?b
if(cb!=null){ M !"Q7>d
list.add(cb); mfI[9G
} Bf00&PE;
} ;kZD>G8
} u`Nrg<
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CountControl.java qXq#A&
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/* :KvZP:T
* CountThread.java &$CyT6mb^
* ~s4JGV~R
* Created on 2007年1月1日, 下午4:57 6x(b/`VW
* @q<h.#9
* To change this template, choose Tools | Options and locate the template under !gLJBp
* the Source Creation and Management node. Right-click the template and choose }0E@eL
* Open. You can then make changes to the template in the Source Editor. D[@-`F
*/ U&B(uk(2
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package com.tot.count; ,/Gp>Yqx
import tot.db.DBUtils; {@7UfJh>
import java.sql.*; C $])q`9
/** 2 N &B
* 2BO H8Mp9
* @author UV;I6]$}A7
*/ W3\+51P
public class CountControl{ Th%w-19,8
private static long lastExecuteTime=0;//上次更新时间 @]X!#&2>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ~P,Z@|c4
/** Creates a new instance of CountThread */ =r]_$r%gR
public CountControl() {} !K*3bY`#
public synchronized void executeUpdate(){ :jTbzDqQ
Connection conn=null; 2ALYfZ|d
PreparedStatement ps=null; d:&cq8^
try{ !?i9fYu
conn = DBUtils.getConnection(); 2xuU[
conn.setAutoCommit(false); Y(rQ032s
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (0 t{
for(int i=0;i<CountCache.list.size();i++){ Dy. |bUB!f
CountBean cb=(CountBean)CountCache.list.getFirst(); E"BW-<_!
CountCache.list.removeFirst(); S?v;+3TG
ps.setInt(1, cb.getCountId()); \J(~
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ps.executeUpdate();⑴ nSo.,72
//ps.addBatch();⑵ `ZC -lAY
} ^v;8 (eF
//int [] counts = ps.executeBatch();⑶ Gv)*[7
conn.commit(); T` v
}catch(Exception e){ hZ<FCY,/?
e.printStackTrace(); %:l\Vhhz
} finally{ @F5QgO J&r
try{ RjR
if(ps!=null) { r<kqs,-~
ps.clearParameters(); ~rz%TDX0\
ps.close(); \9.@Tg8`
ps=null; v.H@Ey2
} 'F8:|g
}catch(SQLException e){} &