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: 1I6px$^E\
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CountBean.java >:!5*E5?
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/* M_f:A
* CountData.java 6@!`]tSCK
* T>Z<]s
* Created on 2007年1月1日, 下午4:44 0mVNQxHI
* qR{=pR
* To change this template, choose Tools | Options and locate the template under hfTY.
* the Source Creation and Management node. Right-click the template and choose ?^{Ah}x
* Open. You can then make changes to the template in the Source Editor. Izc\V9+
*/ %1L,Y
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package com.tot.count; i]4I [!
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/** !qg`/y9
* q2j{tP#
* @author >=>2m2z=
*/ Or+U@vAnk
public class CountBean { _[3D
private String countType; o|:b;\)b
int countId; "sCRdx]_
/** Creates a new instance of CountData */ +\A,&;!SR
public CountBean() {} 3hH<T.@)
public void setCountType(String countTypes){ =nS3p6>rZ
this.countType=countTypes; #!#
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} gf@:R'$:+
public void setCountId(int countIds){ B9 uoVcW
this.countId=countIds; WH} y"W
} {P./==^0
public String getCountType(){ ^CX6&d
return countType; e T{ 4{
} xC TML!H
public int getCountId(){ RqrdAkg
return countId; P@B]
} reWot&;
} ^x,YW]AS}
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CountCache.java t:Q*gWRh
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/* %$L{R
* CountCache.java t*u:hex
* +6\Zj)
* Created on 2007年1月1日, 下午5:01 <'*LRd$1
* ]ieeP4*
* To change this template, choose Tools | Options and locate the template under ;^*W+,4WB
* the Source Creation and Management node. Right-click the template and choose *)Zdz9E'1(
* Open. You can then make changes to the template in the Source Editor. f6Ah6tb
*/ CTa57R
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package com.tot.count; O>,e~#!
import java.util.*; t~XN}gMxw
/** yf+)6D -9n
* oPM96
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* @author T5h
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*/ bd-L`={j
public class CountCache { 7NGxa6wi
public static LinkedList list=new LinkedList(); `;C V=,M
/** Creates a new instance of CountCache */ 5;EvNu
public CountCache() {} L4HI0Mx
public static void add(CountBean cb){ /4Gt{ygSr
if(cb!=null){ *]X'( /b_
list.add(cb); lo+A%\1
} .q>iXE_c
} tD)J*]G
} l_p2Riv
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CountControl.java rILYI;'o
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/* ms]sD3z/W+
* CountThread.java 7<R E_/]
* 4r}51 N\
* Created on 2007年1月1日, 下午4:57 ?@86P|19
* ;Y, y 4{H3
* To change this template, choose Tools | Options and locate the template under ~DwpoeYX
* the Source Creation and Management node. Right-click the template and choose XL^GZ
* Open. You can then make changes to the template in the Source Editor. <5051UEu
*/ 2+XAX:YD
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package com.tot.count; h_'*XWd@
import tot.db.DBUtils; AwR=]W;j
import java.sql.*; 5H^(2w
/** o]V^};B
* F^:3?JA_
* @author 75lA%|
*X
*/ N!}f}oF
public class CountControl{ B+`g>h
private static long lastExecuteTime=0;//上次更新时间 C U0YIL
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ob]w;"
/** Creates a new instance of CountThread */ W>r+h-kR
public CountControl() {}
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public synchronized void executeUpdate(){ RA 6w}:sq7
Connection conn=null; ;xTpE2 -~
PreparedStatement ps=null; SXh-A1t
try{ wCBplaojJ
conn = DBUtils.getConnection(); :ws<-Qy
conn.setAutoCommit(false); (bS&D/N.
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }SZd
for(int i=0;i<CountCache.list.size();i++){ 3v-~K)hl?
CountBean cb=(CountBean)CountCache.list.getFirst(); Vurqt_nb
CountCache.list.removeFirst(); %cn<ych
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ps.setInt(1, cb.getCountId()); dZuOrTplA
ps.executeUpdate();⑴ UEL_uij
//ps.addBatch();⑵ 307I$*%W
} KI.hy2?e
//int [] counts = ps.executeBatch();⑶ vY3h3o
conn.commit(); A#,ZUOPGH
}catch(Exception e){ fz_r7?
e.printStackTrace(); %]i15;{X
} finally{ xE}>,O|'q
try{ 8ao _i=&x
if(ps!=null) { UiNP3TJ'L
ps.clearParameters(); V;=cwy)I
ps.close(); 6y<EgYzdE
ps=null; uxz^/Gk
} lOp`m8_=
}catch(SQLException e){} 8@R|Km5h
DBUtils.closeConnection(conn); Fr-SvsNFB
} 7tp36 TE
} 3so%gvY.'
public long getLast(){ P+}h$_x
return lastExecuteTime; j~MI<I+l[
} WIGi51yC.x
public void run(){ rJB}qYD
long now = System.currentTimeMillis(); Z_NCD`i;
if ((now - lastExecuteTime) > executeSep) { 6]wIG$j
//System.out.print("lastExecuteTime:"+lastExecuteTime); ,esmV-
//System.out.print(" now:"+now+"\n"); ar,7S&s