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: 3rKJ<(-2/
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CountBean.java [C0v-
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/* / 'qoKof
* CountData.java 9)'f)60^
* lh"*$.j-
* Created on 2007年1月1日, 下午4:44 c'eZ-\d{
* _;;Zz&c
* To change this template, choose Tools | Options and locate the template under %;dj6):@
* the Source Creation and Management node. Right-click the template and choose m]AT-]*f
* Open. You can then make changes to the template in the Source Editor. aU_Hl+;
*/ 'v V7@@
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package com.tot.count; Wvr{l
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/** ?![[la+f
* 0Z8"f_GK
* @author E(PBV
*/ 8\lh'8
public class CountBean { ciS,
private String countType; =zyA~}M2
int countId; BtC*]WB"_'
/** Creates a new instance of CountData */ kUgfFa#_
public CountBean() {} V3t#kv
public void setCountType(String countTypes){ <ErX<(0`ig
this.countType=countTypes; )|lxzlk
} pqfX}x
public void setCountId(int countIds){ R^*baiXVI
this.countId=countIds; }LT&BNZj
} dg24h7|]
public String getCountType(){ %A$&9c%
return countType; O9sEaVX
} \uJRjw+
public int getCountId(){ Q# B0JT1
return countId; $QC1l@[sM
} ;Y^'$I2fR#
} Zj_2>A
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CountCache.java 'f-r 6'_ZX
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/* $0 olqt:
* CountCache.java 4D0jt$==
* :dSda,!z
* Created on 2007年1月1日, 下午5:01 ! ;t\lgMl
* sF{aG6u
* To change this template, choose Tools | Options and locate the template under 9RJF
* the Source Creation and Management node. Right-click the template and choose h)HEexyRg
* Open. You can then make changes to the template in the Source Editor. Kgu8E:nL
*/ I x%>aee
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package com.tot.count; (aa2uctTn
import java.util.*; {rUg,y{v
/** eluN~T:W
* @&ZQDi
* @author yWi-ic
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*/ DW. w=L|5R
public class CountCache { RSp wU;o6z
public static LinkedList list=new LinkedList(); .$18%jH#
/** Creates a new instance of CountCache */ $8=|<vt
public CountCache() {} } a9Ah:.7/
public static void add(CountBean cb){ R c+olJ^5
if(cb!=null){ T-en|.
list.add(cb); Qq<@;4
} gc.Lh~
} #J"xByQKK
} c1yRy|
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CountControl.java SO$Af!S:bB
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/* 6Wu*zY_+
* CountThread.java e73=*~kfR
* ^m |@pp
* Created on 2007年1月1日, 下午4:57 l-+=Yk!X
* m2j&0z
* To change this template, choose Tools | Options and locate the template under x}+zhRJ
* the Source Creation and Management node. Right-click the template and choose fST.p|b7
* Open. You can then make changes to the template in the Source Editor. p0Jr{hM
*/ . <"XE7
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package com.tot.count; [7Lr"
import tot.db.DBUtils; dHc\M|HCC
import java.sql.*; +OE!Uqnt
/** 94"+l@K
* .AfZ5s]/F
* @author cFUD$mp
*/ &lQ%;)'
public class CountControl{ 'ToE Y3
private static long lastExecuteTime=0;//上次更新时间 y [8;mCh
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 D'g,<-ahl
/** Creates a new instance of CountThread */ NKu[6J?)
public CountControl() {} )}ev;37<C
public synchronized void executeUpdate(){ >'*%wf[{
Connection conn=null; 6 c_#"4
PreparedStatement ps=null; -s3`mc}*
try{ qoO`)<
conn = DBUtils.getConnection(); 4&}%GH>}
conn.setAutoCommit(false); u 272)@R
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Bf utmI
for(int i=0;i<CountCache.list.size();i++){ $DY#04Je\=
CountBean cb=(CountBean)CountCache.list.getFirst(); SqM>xm
CountCache.list.removeFirst(); t'n@yX_
ps.setInt(1, cb.getCountId()); lPy|>&Yc
ps.executeUpdate();⑴ V8^la'_j
//ps.addBatch();⑵ ~:ASv>m
} >JpBX+]5m
//int [] counts = ps.executeBatch();⑶ im<bo Mv
conn.commit(); Er;/zxg9p
}catch(Exception e){ l0qaTpn
e.printStackTrace(); 1Bj.MQ^
} finally{
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try{ azP H~'E'
if(ps!=null) { {^N,=m\
ps.clearParameters(); u8Ys2KLpL
ps.close(); 2n<Mu Q]
ps=null; Qs&;MW4q
} ;4nY{)bD
}catch(SQLException e){} Q{[@n
DBUtils.closeConnection(conn); wQhNQ(H~\
} Cj-s
} 7Ak<e tHD
public long getLast(){ 3s6obw$ki
return lastExecuteTime; F@BpAl
} }`uyOgGg*
public void run(){ Q5,zs_j
long now = System.currentTimeMillis(); 3\7MeG`tl
if ((now - lastExecuteTime) > executeSep) { '+88UFSq5
//System.out.print("lastExecuteTime:"+lastExecuteTime); $ev+0m_
//System.out.print(" now:"+now+"\n"); Bqf(6\)F
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); w*F[[*j@.
lastExecuteTime=now; CX|W$b)%
executeUpdate(); qSY\a\.<
} &
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else{ {wqT$( (<
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); bb6x} jR
} (GJtTp~2C4
} l6 G6H$
} eZ'8JU]
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ,lZ19B?WP
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类写好了,下面是在JSP中如下调用。 $vs],C"pX
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<% CTIS}_CWd=
CountBean cb=new CountBean(); B)0/kY7c
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); N!+=5!
CountCache.add(cb); ) /raTD
out.print(CountCache.list.size()+"<br>"); IZZAR
CountControl c=new CountControl(); ^'`b\$km-0
c.run(); )|~K&qn`
out.print(CountCache.list.size()+"<br>"); x~e._k=
%>