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: G^W0!u,@
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CountBean.java %,
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/* L5FOlzn
* CountData.java mF;mJq<d
* k\ #;
* Created on 2007年1月1日, 下午4:44 }N[X<9^Z
* 4]U=Y>\Sr
* To change this template, choose Tools | Options and locate the template under WY!\^| ,
* the Source Creation and Management node. Right-click the template and choose %v8&
* Open. You can then make changes to the template in the Source Editor. *2X~NJCt
*/ w[-)c6J yE
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package com.tot.count; OS,!`8cw
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/** WVa%<
* f=l/Fp}4UH
* @author ,' |J
*/ #<*.{"T
public class CountBean { %b^4XTz
private String countType; ^L2d%d\5
int countId; "u^Erj# /
/** Creates a new instance of CountData */ oPmz$]_Z
public CountBean() {} cz9J&Le>
public void setCountType(String countTypes){ wb.yGfJ
this.countType=countTypes; j?N<40z
} U4!KO;Jc
public void setCountId(int countIds){ Y#9W]78He
this.countId=countIds; <_xG)vwh.
} VP#KoX85
public String getCountType(){ {nKw<F2
return countType; h< r(:.%!}
} WA(x]""
public int getCountId(){ hQ@k|3=Re
return countId; *K|~]r(F?
} 6'^E
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} D -tRy~}
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CountCache.java AmF[#)90P
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/* M3jUnp&
* CountCache.java %'iJVFF
* @ual+=L
* Created on 2007年1月1日, 下午5:01 ,'s}g,L
* i3w~&y-
* To change this template, choose Tools | Options and locate the template under F{ %*(U
* the Source Creation and Management node. Right-click the template and choose sE[`x^1'8
* Open. You can then make changes to the template in the Source Editor. CV
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*/ t<UJR*R=L
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package com.tot.count; SZKYq8ZA)V
import java.util.*; `q36`Wn
/** 9G/!18 X?f
* k'st^1T
* @author +.!D>U$)}
*/ fbh,V%t7
public class CountCache { LI%dJ*-V
public static LinkedList list=new LinkedList(); Y1h)aQ5{
/** Creates a new instance of CountCache */ MDlH[PJ@i
public CountCache() {} :K6JrS
public static void add(CountBean cb){ 76 !LMNf
if(cb!=null){ FaeKDbLJr
list.add(cb); vaB ql(?'2
} u+j\PWOtm
} ?y?9;;
} i"<W6
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CountControl.java p}QDX*/sSu
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/* Y!L-5|G
* CountThread.java q}Q G<%VR
* }<^mUG
* Created on 2007年1月1日, 下午4:57 O(/~cQ
* xE8?%N U
* To change this template, choose Tools | Options and locate the template under r]!#v{#.
* the Source Creation and Management node. Right-click the template and choose #+ch
* Open. You can then make changes to the template in the Source Editor. hr];!.Fv
*/ wY<s
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package com.tot.count; %C/p+Tg
import tot.db.DBUtils; on7
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import java.sql.*; K%dQ;C*?
/** [\W&
* qKD
* @author 3Z";a
*/ xS 1|t};
public class CountControl{ YD[HBF)~j
private static long lastExecuteTime=0;//上次更新时间 B/;>v
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 nz3*s#k\-
/** Creates a new instance of CountThread */ v/ N[)<
public CountControl() {} &{? M} 2I
public synchronized void executeUpdate(){ qj;i03 +@
Connection conn=null; Nud =K'P=
PreparedStatement ps=null; Ss%Cf6qdWL
try{ T#qf&Q Z
conn = DBUtils.getConnection(); ,Wd=!if
conn.setAutoCommit(false); VFf;|PHS
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Q2 !GWz$
for(int i=0;i<CountCache.list.size();i++){ f5*qlQJFz\
CountBean cb=(CountBean)CountCache.list.getFirst(); ZR\N~.
CountCache.list.removeFirst(); [P+kQBLpL
ps.setInt(1, cb.getCountId()); Q#3}AO
ps.executeUpdate();⑴ @4y?XL(n
//ps.addBatch();⑵ ,cNe-KJk
} NVx>^5QV
//int [] counts = ps.executeBatch();⑶ {N}az"T4f
conn.commit(); 7n#-3#_mG
}catch(Exception e){ b#?sx"z
e.printStackTrace(); ``CM7|)>`
} finally{ 7"'RE95
try{ ~-k,$J?7
if(ps!=null) { #//xOL3J
ps.clearParameters(); &9flNoNR9
ps.close(); P*!`AWn
ps=null; ^W$R{`
} y7>3hfn~w
}catch(SQLException e){} >1`4]%
DBUtils.closeConnection(conn); |~5cNm
} TBt5Nqks-
} GM2}]9
public long getLast(){ ![%wM Pp
return lastExecuteTime; c[ZrQJ
} [e` |<
public void run(){ D
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long now = System.currentTimeMillis(); <q=Zg7zB
if ((now - lastExecuteTime) > executeSep) { <XLaJ;j
//System.out.print("lastExecuteTime:"+lastExecuteTime); trDw|WA
//System.out.print(" now:"+now+"\n"); f!kZyD7
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); )IcSdS0@M
lastExecuteTime=now; <<01@Q <