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: `x`[hJ?i
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CountBean.java >5t%_/yeB
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/* 5*pzL0,Y
* CountData.java AAevN3a#nI
* TJO$r6&
* Created on 2007年1月1日, 下午4:44 %M@K(Qu
* Icnhet4
* To change this template, choose Tools | Options and locate the template under l}))vf=i
* the Source Creation and Management node. Right-click the template and choose 27e!KG[&
* Open. You can then make changes to the template in the Source Editor. VI&x1C
*/ FvxM
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package com.tot.count; _F;v3|`D@<
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/** ,twx4r^
* XVYFyza;
* @author @Nek;xJ
*/ W&?Qs=@
public class CountBean { <OMwi9
private String countType; "<!U
int countId; "]+g5G
/** Creates a new instance of CountData */ JL1ajlm~
public CountBean() {} WEimJrAn
public void setCountType(String countTypes){ ::|~tLFu
this.countType=countTypes; "?I#!t%'
} /o;M
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public void setCountId(int countIds){ t<!;shH,s
this.countId=countIds; j~Aq-8R=
} kOYUxr.b
public String getCountType(){ w7V\_^&Id
return countType; 7Q}pKq]P
} M3pE$KT0x
public int getCountId(){ u5(8k_7
return countId; <xOX+D
} -zR<m
} +WH\,E
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CountCache.java _v,0"_"
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/* z%82Vt!a5
* CountCache.java 7zb^Z]
* b dgkA
* Created on 2007年1月1日, 下午5:01 H@Z_P p?
* ;)(g$r^_i
* To change this template, choose Tools | Options and locate the template under D@O`"2
* the Source Creation and Management node. Right-click the template and choose 4ba*Nc*Yc
* Open. You can then make changes to the template in the Source Editor. Z[oF4 z
*/ -K64J5|b7
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package com.tot.count; oJ74Mra
import java.util.*; z0[XI 7KK
/** r
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* h.jJAVPi
* @author 4l$OO;B
*/ |kYlh5/c d
public class CountCache { ] G&*HMtp
public static LinkedList list=new LinkedList(); %71i&T F
/** Creates a new instance of CountCache */ \i%'M%
public CountCache() {} HN7CcE+l
public static void add(CountBean cb){ wVBKVb9N
if(cb!=null){ i(}PrA
list.add(cb); pHV^Kv#
} r;#"j%z
} !6!)H8rX
} 6Y9N=\`
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CountControl.java sdFHr4
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/* yqT !A
* CountThread.java j/ 5
* tn]nl!_@
* Created on 2007年1月1日, 下午4:57 U'fP
* 7' G;ijx
* To change this template, choose Tools | Options and locate the template under J2bvHxb Rd
* the Source Creation and Management node. Right-click the template and choose j#l=%H
* Open. You can then make changes to the template in the Source Editor. t#k]K]
*/ z*\_+u~u
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package com.tot.count; 2}hJe+#v
import tot.db.DBUtils; R'>!1\?Iq
import java.sql.*; sh<Q2X
/** IPQRdBQ
* mq`/nAmt
* @author 6_CP?X+T
*/ Npp YUY
public class CountControl{ ?:(y
private static long lastExecuteTime=0;//上次更新时间 =8AT[.Hh
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &@0~]\,D7
/** Creates a new instance of CountThread */ %5o2I_Cjz
public CountControl() {} )l3Uf&v^f
public synchronized void executeUpdate(){ <!OBpAq
Connection conn=null; I652Fcj
PreparedStatement ps=null; ^/f~\#R
try{ )GD7rsC`<
conn = DBUtils.getConnection(); &d_^k.%y
conn.setAutoCommit(false); WR;1
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); cU1o$NRx
for(int i=0;i<CountCache.list.size();i++){ LP2~UVq
CountBean cb=(CountBean)CountCache.list.getFirst(); [h/T IGE\
CountCache.list.removeFirst(); \TQZZ_Z
ps.setInt(1, cb.getCountId()); @- U\!Tf
ps.executeUpdate();⑴ _D '(R
//ps.addBatch();⑵ l/.{F ;3F
} 5\ mRH
//int [] counts = ps.executeBatch();⑶ uYh!04u
conn.commit(); ARH~dN* C
}catch(Exception e){ akj<*,
e.printStackTrace(); a=z] tTs4
} finally{ osW"wh_
try{ >B BV/C'9
if(ps!=null) { )(iv#;ByL
ps.clearParameters(); g`XngRb|j
ps.close(); OF-k7g7
ps=null; ~tDYo)hH8
}
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}catch(SQLException e){} 7sot?gF
DBUtils.closeConnection(conn); jLAEHEs
} 8q2a8I9g
} mQ"~x]
public long getLast(){ HW@wia
return lastExecuteTime; eg0_ <
} Iy<>-e"|
public void run(){ >jm(2P(R
long now = System.currentTimeMillis(); afm\Iv[*
if ((now - lastExecuteTime) > executeSep) { p.DQ|?
//System.out.print("lastExecuteTime:"+lastExecuteTime); >)>f~ >
//System.out.print(" now:"+now+"\n"); gq=t7b
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ,81%8r
lastExecuteTime=now; vy<W4
executeUpdate(); q m3\)9C
} b1&