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: >=6 j:
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CountBean.java eT'Z;ZO
*=2sXH1j
/* Uhw:XV@m
* CountData.java f`gs/R
* qk{+Y
* Created on 2007年1月1日, 下午4:44 /q^\g4J
* m8T< x>
* To change this template, choose Tools | Options and locate the template under n9 %&HDl4
* the Source Creation and Management node. Right-click the template and choose b2tUJ2p
* Open. You can then make changes to the template in the Source Editor. ppP0W`p
*/ R<L<kChg
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package com.tot.count; LmZ"_
Y'{F^VxA/
/** W"v"mjYud
* +_T`tmQ
* @author Gp9:#L!
*/ ;:]#Isq
public class CountBean { 3J_BuMV
private String countType; u)4eu,MBT
int countId; \-W|)H
/** Creates a new instance of CountData */ Q1'4xWu
public CountBean() {} r$cq2pkX
public void setCountType(String countTypes){ 4G_At
this.countType=countTypes; ~PtIq.BY
} @2;/-,4O
public void setCountId(int countIds){ fP KFU
this.countId=countIds; z[sP/{~z
} k9_c<TSzu
public String getCountType(){ Ncr*F^J4
return countType; k0v&U@+-J
} fe4Ki
public int getCountId(){ h]jy):9L
return countId; a;h.I}*]
} ZnAXb S
} wj{[g^y%
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CountCache.java di4>Ir~]
NVX @1}
/* 'JRYf;9c
* CountCache.java T^DJ/uhd
* m#,AD,s
* Created on 2007年1月1日, 下午5:01 E;bv;RUio
* u Wxl\+_i
* To change this template, choose Tools | Options and locate the template under =v{Vl5&>?
* the Source Creation and Management node. Right-click the template and choose ;i,3KJ[L
* Open. You can then make changes to the template in the Source Editor. O%)Wo?)HM
*/ '/'dg5bfV
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package com.tot.count; od-yVE&
import java.util.*; 2r"J"C
/** P^57a?[`
* +pY--5t
* @author tyU'[LF?
*/ <<Q}|$Wu
public class CountCache { c0v6*O)
public static LinkedList list=new LinkedList(); mXOY,g2w
/** Creates a new instance of CountCache */ HZ[.,DuW
public CountCache() {} K"/3/`T
public static void add(CountBean cb){ )>(ZX9diV
if(cb!=null){ =k]2Ad
list.add(cb); XI\P#"
} T9\G,;VQ7/
} DS|q(O=7~t
} [T(`+
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CountControl.java z'9U.v'M)
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/* >/+R~ n
* CountThread.java 6hiWgbE
* 1d 1
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* Created on 2007年1月1日, 下午4:57 #SX-Y)> 1@
* ez14f$cJ+
* To change this template, choose Tools | Options and locate the template under mMw--Gc?
* the Source Creation and Management node. Right-click the template and choose IAi|4,y_L
* Open. You can then make changes to the template in the Source Editor. /@?lV!QiO
*/ Fv-~v&
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package com.tot.count; o/hj~;(]
import tot.db.DBUtils; ugzrG0=lx
import java.sql.*; uqv S
/** uI\6":/u
* WXQ+`OH7
* @author l.xKv$uOGR
*/ kfgkZ"9
public class CountControl{ [=TD)o>W(p
private static long lastExecuteTime=0;//上次更新时间 )lH`a
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 i :|e#$x
/** Creates a new instance of CountThread */ _>E=.$
public CountControl() {} 2QgD<
public synchronized void executeUpdate(){ 9/h[(qvT
Connection conn=null; 8l*h\p:Q
PreparedStatement ps=null; ;R]~9Aan
try{ k`BS{,=
conn = DBUtils.getConnection(); z#B(1uI
conn.setAutoCommit(false); d*_rJE}B
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); l?B=5*0
for(int i=0;i<CountCache.list.size();i++){ joBS{]
CountBean cb=(CountBean)CountCache.list.getFirst(); E1s~ +
CountCache.list.removeFirst(); )%09j0y>l"
ps.setInt(1, cb.getCountId()); 'Pe;Tp>`
ps.executeUpdate();⑴ #A&49a3^1
//ps.addBatch();⑵ ldnKV&N
} :3[;9xCHj
//int [] counts = ps.executeBatch();⑶ xri(j,mU
conn.commit(); k\X yR4r
}catch(Exception e){ eig{~3
e.printStackTrace(); g?N^9B,$2
} finally{ _+OCI%=:
try{ Zi}jf25
if(ps!=null) { E:y^= Y
ps.clearParameters(); !j/54,
ps.close(); -TS5g1
ps=null; LKBh{X0%(
} q[(1zG%NbA
}catch(SQLException e){} XXA.wPD-
DBUtils.closeConnection(conn); |W*5<2Q9
} av bup
} j&[u$P*K
public long getLast(){ ~KczP1p
return lastExecuteTime; pM9M8d
} ]app 9
public void run(){ #nq_R
long now = System.currentTimeMillis();
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if ((now - lastExecuteTime) > executeSep) { $Lz!04
//System.out.print("lastExecuteTime:"+lastExecuteTime); (9{qT>eJg=
//System.out.print(" now:"+now+"\n"); &