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: oQKcGUZ
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CountBean.java s7X~OF(#
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/* M<hs_8_*
* CountData.java bDcWb2lqs
* JRcuw'8+q
* Created on 2007年1月1日, 下午4:44 Fb$5&~d
* gPn%`_d5
* To change this template, choose Tools | Options and locate the template under 4B%5-VQ
* the Source Creation and Management node. Right-click the template and choose 1L(Nfkh
* Open. You can then make changes to the template in the Source Editor. bTI&#Hu
*/ !~VR|n-
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package com.tot.count; ~Y}Z4" o
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/** bE%mgaOh
* O=9V X
* @author J_)z:`[yE
*/ !S$oaCxM
public class CountBean { Ve')LY<
private String countType; 9X*eE
int countId; P"[l86:
/** Creates a new instance of CountData */ zrWq!F*-V\
public CountBean() {} Uz m[e%/`
public void setCountType(String countTypes){ )x5$io
this.countType=countTypes; "m\UqQGX
} lMI
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public void setCountId(int countIds){ d(dw]6I6
this.countId=countIds; g~WNL^GGS
} b{ubp
public String getCountType(){ S|Ij q3
return countType; NUO,"Bqq
} FcbA)7dD
public int getCountId(){ 2e D\_IW
return countId; S{r)/~/
} 9-e[S3ziM
} R*c0NJF
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CountCache.java
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/* T(fR/~:z?
* CountCache.java PSrt/y!
* %V" +}Dr
* Created on 2007年1月1日, 下午5:01 {/[?YTDU
* 3K;b~xg`nw
* To change this template, choose Tools | Options and locate the template under ]!S)O|_D[
* the Source Creation and Management node. Right-click the template and choose emDvy2uA#
* Open. You can then make changes to the template in the Source Editor. Rh-8//&vZ/
*/ qS[p|*BL
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package com.tot.count; n3@g{4~
import java.util.*; (B~V:Yt
/** VHY<(4@
* vGMOXbq4&
* @author t&?v9n"X
*/ C">=2OO
public class CountCache { =-B3vd:LF
public static LinkedList list=new LinkedList(); Ot:\h
/** Creates a new instance of CountCache */ ]mGsNQ ].H
public CountCache() {} 'c+qBSDA
public static void add(CountBean cb){ XC8z|A-@
if(cb!=null){ 9gIJX?
list.add(cb);
} C2i#;b
} ne%OTr4dD
} >c'_xa?^G
} \~1zAiSd>#
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CountControl.java "1j\ZCXK_Z
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/* 2|_Jup
* CountThread.java T`2fPxM:cZ
* 1Mhc1MU
* Created on 2007年1月1日, 下午4:57 &Bdt+OQ ;
* <raqp Oo&
* To change this template, choose Tools | Options and locate the template under <t|9`l_XW
* the Source Creation and Management node. Right-click the template and choose laRKt"A
* Open. You can then make changes to the template in the Source Editor. F~- S3p
*/ Zp(P)Obs#
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package com.tot.count; nN]vu
import tot.db.DBUtils; i:Ct6[
import java.sql.*; ?lw[
/** @p'v.;~#
* D+U/ ]sW
* @author y&I|m
*/ #$z -]i
public class CountControl{ 4lKbw4[a
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &CP@]
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/** Creates a new instance of CountThread */ .g`*cDW^=
public CountControl() {} :?XHZ
public synchronized void executeUpdate(){ eR
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Connection conn=null; JFk|Uqs(
PreparedStatement ps=null; _q 9lr8hx
try{ QNI|h;D
conn = DBUtils.getConnection(); hO@v\@;r
conn.setAutoCommit(false); z#
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); y Q @=\'
for(int i=0;i<CountCache.list.size();i++){ EqDYQ
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CountBean cb=(CountBean)CountCache.list.getFirst(); u9^;~i,
CountCache.list.removeFirst(); qQRYHo>/e
ps.setInt(1, cb.getCountId()); *UxB`iA
ps.executeUpdate();⑴ bOGDz|H``
//ps.addBatch();⑵ Ch!Q? 4
} g~["O!K3
//int [] counts = ps.executeBatch();⑶ :/[ZgreN6
conn.commit(); J?ZVzKTb>}
}catch(Exception e){ Pds*M?&F
e.printStackTrace(); 4qXUk:C@m
} finally{ 8ch~UBq/
try{ `1v!sSR0R
if(ps!=null) { $aI MQ[(
ps.clearParameters(); [(UqPd$
ps.close(); k{w^MOHNg
ps=null; )Is*-
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} oK1[_ko|
}catch(SQLException e){} i|noYo_Ah\
DBUtils.closeConnection(conn); -&$%m)wN
} R;,HtN
} Gqc6).tn
public long getLast(){ H+&w