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: :8hI3]9
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CountBean.java 7 4MxU
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/* o-7{\%+M
* CountData.java cz{`'VN}`
* {\CWoFht>
* Created on 2007年1月1日, 下午4:44 Z\xnPhV
* *OznZIn
* To change this template, choose Tools | Options and locate the template under J"LLj*,0"
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. tx~,7TMS/
*/ s1[&WDedM
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package com.tot.count; jC4>%!{m
lwrh4<~\,*
/** kLF`6ZXtd
* [rWBVfm
* @author 7 QNx*8 p
*/ Pd\4hy
public class CountBean { NsP=l]
private String countType; <kPNe>-f
int countId; PJ0~ymE1~G
/** Creates a new instance of CountData */ ]% HxzJ
public CountBean() {} q,O_y<uw
public void setCountType(String countTypes){ KFwuz()7
this.countType=countTypes; z<%bNnSO
} c:u*-lYmK%
public void setCountId(int countIds){ eZqEFMBTm
this.countId=countIds; ZY]$MZf5yo
} _,)_(R ,h
public String getCountType(){ E+qLj|IU
return countType; GDSXBa*7
} +pwTM]bV
public int getCountId(){ H-+U^@w
return countId; fmj}NV&ma
} #UoFU{6tM
} {?0'(D7.
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CountCache.java #e-K It
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/* cZ|*Zpk
* CountCache.java ch]Qz[d
* ][jwy-Uy;
* Created on 2007年1月1日, 下午5:01 -Pp{aFe
* [*p;+&+/ZM
* To change this template, choose Tools | Options and locate the template under %%}l[W
* the Source Creation and Management node. Right-click the template and choose Os'E7;:1h
* Open. You can then make changes to the template in the Source Editor. wGNEb
*/ <<u]WsW{C
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package com.tot.count; SoM,o]s#y
import java.util.*; 0*b8?e
/** R9R~$@~G
* <Y7j' n
* @author fc@<' -VA
*/ nUpj+F#
public class CountCache { v)_c*+6u
public static LinkedList list=new LinkedList(); O=7S=Rm4&
/** Creates a new instance of CountCache */ S/) ),~`4
public CountCache() {} T$"~Vu
public static void add(CountBean cb){ [-VH%OM
if(cb!=null){ ,]wQ]fpt
list.add(cb); S8dfe~ |7:
} ]NTQF/
} xjbI1qCfe
} 0SYJ*7lPX
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CountControl.java #rX^)2
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/* 8A&N+sT
* CountThread.java Yv]vl6<
* i4D]>
* Created on 2007年1月1日, 下午4:57 #oTVfY#
* 8iY.!.G#|
* To change this template, choose Tools | Options and locate the template under E*5aLT5!,
* the Source Creation and Management node. Right-click the template and choose J' P:SC1
* Open. You can then make changes to the template in the Source Editor. '6qH@r4Z<
*/ fDns r"T
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package com.tot.count; Ur< (TM
import tot.db.DBUtils; Sy <E@1
import java.sql.*; elGBX
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/** `PtB2,?
* rhPv{6Z|7
* @author & n@hD7=(
*/ .jqil0#)Y"
public class CountControl{ jc_k\
private static long lastExecuteTime=0;//上次更新时间 /r'Fq
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 >$rH,Er
/** Creates a new instance of CountThread */ c!6v-2ykv
public CountControl() {} ]lfufjj
public synchronized void executeUpdate(){ Hif|z[0$
Connection conn=null; xI?'Nh
PreparedStatement ps=null; 9?ll(5E
try{ Q3l>xh
conn = DBUtils.getConnection(); |+Rx)
conn.setAutoCommit(false); v1yB
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); !%t@wQ]\hG
for(int i=0;i<CountCache.list.size();i++){ `;}qjm0a
CountBean cb=(CountBean)CountCache.list.getFirst(); nw/g[/<;
CountCache.list.removeFirst(); Xk%eU>d
ps.setInt(1, cb.getCountId()); vo
}4N[]Sb
ps.executeUpdate();⑴ Kn$E{ F\
//ps.addBatch();⑵ <`SA>P
} P??P"^hU
//int [] counts = ps.executeBatch();⑶ Vbp@n
conn.commit(); .$cX:"_Mk
}catch(Exception e){ n%36a(]
t
e.printStackTrace(); <(Ar[Rp
} finally{ U~yPQ8jD
try{ 5g-1pzP9
if(ps!=null) { ',[AKXJ
ps.clearParameters(); h&