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: WlWBYnphZs
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CountBean.java a/>={mbKi
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/* s-
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* CountData.java W!GgtQw{F
* ]%shs
* Created on 2007年1月1日, 下午4:44 3&x_%R
* @kI^6(.
* To change this template, choose Tools | Options and locate the template under Jw;J$
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* the Source Creation and Management node. Right-click the template and choose i1|-
* Open. You can then make changes to the template in the Source Editor. ffuV$#
*/ l EQn2+
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package com.tot.count; $n(@hT>?
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/** mP3:Fc_G
* Q:=s99
* @author u )
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*/
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public class CountBean { i aP+Vab
private String countType; %<I0-o
int countId; J^0co1Y0
/** Creates a new instance of CountData */ d-xKm2sH
public CountBean() {} ];zi3oS^
public void setCountType(String countTypes){ [4t_ 83
this.countType=countTypes; f[h=>O
} =We}&80x
public void setCountId(int countIds){ n#Z6 d`
this.countId=countIds; U/|B IF
} LDwu?"P!
public String getCountType(){ I?l*GO+pz
return countType; F!^ Y!Y@H
} j G{xFz>x
public int getCountId(){ pwU]r
return countId; Y @pkfH
} 7m@pdq5Ub
} "+Xwc+v^
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CountCache.java s~M!yuH
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/* &$vDC M4
* CountCache.java DRf~l9f
* p5G O@^i
* Created on 2007年1月1日, 下午5:01 4?72TBl]
* fN8A'p[
* To change this template, choose Tools | Options and locate the template under N#]f?6*R
* the Source Creation and Management node. Right-click the template and choose <NT /+>:2
* Open. You can then make changes to the template in the Source Editor. a]
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*/ >N+e c_D^
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package com.tot.count; zS|%+er~zO
import java.util.*; ]<W1edr
/** *C's7O{O
* LFV;Y.-(h
* @author w#XE!8`
*/ H\^5>ccU>V
public class CountCache { C=%go1! $
public static LinkedList list=new LinkedList(); 8m-jU
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/** Creates a new instance of CountCache */ ruF+X)
public CountCache() {} <(#cPV@j
public static void add(CountBean cb){ b\]"r x
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if(cb!=null){ Gash3}+
list.add(cb); N |7<*\o
} "0zMx`Dh
} D.R5-
} [9aaHf@'
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CountControl.java .- c3f1i
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/* P]r"E
* CountThread.java x1mxM#ql
* C2ToT \^
* Created on 2007年1月1日, 下午4:57 dpJi5fN
* Mr/^V,rA
* To change this template, choose Tools | Options and locate the template under >G/>:wwSP.
* the Source Creation and Management node. Right-click the template and choose MH{vFA4:,
* Open. You can then make changes to the template in the Source Editor. mj5A*%"W
*/ D1#E&4
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package com.tot.count; YfF&: "-NU
import tot.db.DBUtils; [J-r*t"!
import java.sql.*; gjyg`%
/** ]WyV~Dzz<
* b^hCm`2w*
* @author }[ux4cd8Y
*/ ?vf\_R'M
public class CountControl{ as~. XWa
private static long lastExecuteTime=0;//上次更新时间 rw_&t>Ri;
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 '>'h7F=tY
/** Creates a new instance of CountThread */ PX2Ejrwj
public CountControl() {} Z''Fz(qMC
public synchronized void executeUpdate(){ 3<fJ5-z|-
Connection conn=null; Ob0=ZW`+&
PreparedStatement ps=null; a;/4 ht
try{ &~||<0m
conn = DBUtils.getConnection(); >fs-_>1d
conn.setAutoCommit(false); v`beql
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); gY*Cl1 Iz
for(int i=0;i<CountCache.list.size();i++){ Ra~n:$tg2
CountBean cb=(CountBean)CountCache.list.getFirst(); ]2b" oHg
CountCache.list.removeFirst(); kFD-
ps.setInt(1, cb.getCountId()); YF&SH)Y7
ps.executeUpdate();⑴ [.dNX
//ps.addBatch();⑵ hTVN`9h7
} >SfC '* 1
//int [] counts = ps.executeBatch();⑶ j]
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conn.commit(); ~R!(%j ]
}catch(Exception e){ O aF+Z@s
e.printStackTrace(); 0SvPyf%AC
} finally{ !4.;Ftgjn
try{ )m5<gp `
if(ps!=null) { y<3v/,Y
ps.clearParameters(); /:awPYGH<1
ps.close(); @$+l ^"#-]
ps=null; vbwEX 6
} hw~cS7
}catch(SQLException e){} BIV]4vl-&
DBUtils.closeConnection(conn); r=&PUT+vt
} 0b*a2_|8k
} Z][?'^`^!
public long getLast(){ du'$JtZo
return lastExecuteTime; 9R.tkc|K
} Av+
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public void run(){ RA.@(DN&
long now = System.currentTimeMillis(); vkbB~gr@*
if ((now - lastExecuteTime) > executeSep) { ;;l(
//System.out.print("lastExecuteTime:"+lastExecuteTime); .=^h@C*
//System.out.print(" now:"+now+"\n"); "lN<v=
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); :VLuI
lastExecuteTime=now; rD$7;
executeUpdate(); ^D vaT9s
} E8NIH!dI
else{ G*J(4~Yw}
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
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} jN5Sc0|b
} |G%MiYd
} dF1Bo
//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 OQ!mL3f
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类写好了,下面是在JSP中如下调用。 1egryp
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<% 39~fP)
CountBean cb=new CountBean(); ch :428
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); JmN;v|wF:c
CountCache.add(cb); wQ[2yq
out.print(CountCache.list.size()+"<br>"); LGod"8~U
CountControl c=new CountControl(); A9lqVMp64
c.run(); g3x192f
out.print(CountCache.list.size()+"<br>"); 06Uxd\E~
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