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: ^71sIf;+
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CountBean.java j8lbn |.
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/* ]'"$qm:
* CountData.java }&=C*5JN
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* Created on 2007年1月1日, 下午4:44 'b-}KDP
* X0m\
* To change this template, choose Tools | Options and locate the template under EprgLZ1B
* the Source Creation and Management node. Right-click the template and choose $+tkBM
* Open. You can then make changes to the template in the Source Editor. rIXAn4,dTv
*/ @=$;^}JS|
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package com.tot.count; |2mEowAd
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/** !Ed';yfz\(
* k]v a
* @author k@[Bx>
*/ q|S }5
public class CountBean { =4?m>v,re
private String countType; O:1YG$uKa
int countId; B"G;"X
/** Creates a new instance of CountData */ 8 }-"&-X
public CountBean() {} WKN\*N <
public void setCountType(String countTypes){
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this.countType=countTypes; 8^O|Aa$IF:
} 4YKb~1qkk
public void setCountId(int countIds){ Gv<K#@9T
this.countId=countIds; E0GpoG5C
} mX
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public String getCountType(){ K(hqDif*6
return countType; R#oXQaBJ
} 8NpQ"0X
public int getCountId(){ P!:D2zSH_
return countId; =>4,/g3
} *C$
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} 5)0R:
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CountCache.java 4/$]wK`
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/* y6$5meh.T
* CountCache.java @;pTQ
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* ^"l4
* Created on 2007年1月1日, 下午5:01 I"r*p?
* HJwj,SL
* To change this template, choose Tools | Options and locate the template under |ONkRxr@!
* the Source Creation and Management node. Right-click the template and choose &ceZu=*
* Open. You can then make changes to the template in the Source Editor. OD{Rh(Id
*/ h" j{B
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package com.tot.count; rqifjsv
import java.util.*; s<n5^Vxy
/** [5>0om5
* e)O6k7U$
* @author ^ygN/a>rr
*/ eQA89 :j,
public class CountCache { xCGvLvFn
public static LinkedList list=new LinkedList(); st~f}w@
/** Creates a new instance of CountCache */ p,U.5bX
public CountCache() {} H;|^z@RB<
public static void add(CountBean cb){ D.X%wJ8
if(cb!=null){ O]`CSTv'_
list.add(cb); j$BM$q/c
} F8.Fp[_tM
} >AJtoJ=j
} jrG@
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CountControl.java flnoK%wi
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/* |K7JU^"OQ
* CountThread.java d.sxB}_O
* C}%g(YRhb
* Created on 2007年1月1日, 下午4:57 ^~?VD
* Jva&"}Cb
* To change this template, choose Tools | Options and locate the template under [Cvo^cC
* the Source Creation and Management node. Right-click the template and choose 3}2'PC
* Open. You can then make changes to the template in the Source Editor. .(`#q@73
*/ J1hc :I<;
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package com.tot.count; Jk 0;<2j
import tot.db.DBUtils; u<:RSg
import java.sql.*; "4zTP!Ow
/** }"E?#&^
* _=}Efy7
* @author t /1KKEZM
*/ ',v
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public class CountControl{ V\Cu|m&HI
private static long lastExecuteTime=0;//上次更新时间 [PdatL2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 )lE]DG!
/** Creates a new instance of CountThread */ `#E1FB2M
public CountControl() {} z1*8 5?
public synchronized void executeUpdate(){ *q\Ve)E}
Connection conn=null; FlttqQQdf
PreparedStatement ps=null; fMy7pXa_
try{ b~z1%?
conn = DBUtils.getConnection(); ">j}!n
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conn.setAutoCommit(false); mY+Jju1
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); km|;T!
for(int i=0;i<CountCache.list.size();i++){ ] K3^0S/
CountBean cb=(CountBean)CountCache.list.getFirst(); TW"
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CountCache.list.removeFirst(); M|w;7P}
ps.setInt(1, cb.getCountId()); ]%!:'#
ps.executeUpdate();⑴ M| :wC
//ps.addBatch();⑵ |L11?{ K
} nRzD[3I
//int [] counts = ps.executeBatch();⑶ %A|9=x*
conn.commit(); 79^Y^.D
}catch(Exception e){ _8v8qT}O~4
e.printStackTrace(); N`h, 2!(j
} finally{
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try{ IQAV`~_G
if(ps!=null) { ;`p+Vs8C
ps.clearParameters(); 5B<