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: ?eV4SH
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CountBean.java mo~*C
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/* =IAsH85Q
* CountData.java qY 4#V k
* $=?@*p
* Created on 2007年1月1日, 下午4:44 [pVamE
* $ cj>2.
* To change this template, choose Tools | Options and locate the template under `K,1K
* the Source Creation and Management node. Right-click the template and choose G\NPV'
* Open. You can then make changes to the template in the Source Editor. *.)tG
*/ ^&g=u5
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package com.tot.count; VbBPB5 $q
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/** B c2p(z4
* >vo=]cw
* @author l7De6A"
*/ Fd*8N8Pi
public class CountBean { :x_'i_w
private String countType; TIvRhbu
int countId; eW|^tH
/** Creates a new instance of CountData */ %4HRW;IU
public CountBean() {} JI vo_7{
public void setCountType(String countTypes){ %Qk/_ R1
this.countType=countTypes; OT&k.!=
} Y2'cs~~$Ce
public void setCountId(int countIds){ -.{g}R%
this.countId=countIds; G\TfL^A
} ^]
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public String getCountType(){ WOh|U4vt
return countType; )&
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} -(K9s!C!.
public int getCountId(){ ~)(\6^&=|
return countId; vOg#Dqn-
} ,]T2$?|
} "Ky; a?Y
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CountCache.java
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/* ,!U=|c"k)
* CountCache.java U!Ek'
* H:"maS\I
* Created on 2007年1月1日, 下午5:01 =N 5z@;!
*
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* To change this template, choose Tools | Options and locate the template under *-xU2
* the Source Creation and Management node. Right-click the template and choose fw[y+Bi&
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* Open. You can then make changes to the template in the Source Editor. Qyy.IPTP
*/ kY'T{Sm1^
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package com.tot.count; "+unS)M;Y
import java.util.*; N<DGw?Rl
/** \(%Y%?dy
* '? jlH0;
* @author )XWP\
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*/ |.wEm;Bz
public class CountCache { DfKr[cqLM
public static LinkedList list=new LinkedList();
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/** Creates a new instance of CountCache */ ]n-:Yv5 W
public CountCache() {} VWO9=A*Y|
public static void add(CountBean cb){ o: ;"w"G
if(cb!=null){ ;,]P=Ey
list.add(cb); zz& ?{vJ
} MMj9{ou
} ,*7d
} ;D$)P7k6
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CountControl.java ~/*MY
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/* 1T[et-
* CountThread.java Y/7 $1k
* H@l}WihW
* Created on 2007年1月1日, 下午4:57 gynh#&r
* uIZWO.OdU
* To change this template, choose Tools | Options and locate the template under "U7qo}`I
* the Source Creation and Management node. Right-click the template and choose \G-KplKS
* Open. You can then make changes to the template in the Source Editor. &~W:xg(jN
*/ zk( U8C+
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package com.tot.count; :^(>YAyHj^
import tot.db.DBUtils; Qf@
import java.sql.*; '}$Dgp6e
/** N$[{8yil^w
* \<g*8?yFs
* @author 50={%R
*/ |DsnNk0c
public class CountControl{ p/h
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private static long lastExecuteTime=0;//上次更新时间 5L!y-3
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 tToTxf~
/** Creates a new instance of CountThread */ 7nuU^wc
public CountControl() {} `]W|8M
public synchronized void executeUpdate(){ |6<p(i7
Connection conn=null; L`24?Y{
PreparedStatement ps=null; Z4\=*ic@
try{ w4gg@aO
conn = DBUtils.getConnection(); |iwP:C^\mJ
conn.setAutoCommit(false); 8-O)Xx}cU
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); LGtIm7
for(int i=0;i<CountCache.list.size();i++){ V5rST +
CountBean cb=(CountBean)CountCache.list.getFirst(); Sy
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CountCache.list.removeFirst(); o>VVsH
ps.setInt(1, cb.getCountId()); G["c\Xux
ps.executeUpdate();⑴ w`5xrqt@
//ps.addBatch();⑵ s)pbS}L
} Sm5H_m!
//int [] counts = ps.executeBatch();⑶ ' MxrQ;|S
conn.commit(); vuYSVI2=H
}catch(Exception e){ O6OP =K!t:
e.printStackTrace(); F|!){=
} finally{ VX1-JxY
try{ \P6$mh\T
if(ps!=null) { 15sp|$&`
ps.clearParameters(); /~<@ *-'
ps.close(); >qF CB\(
ps=null; ^-
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} ~Rr~1I&mR,
}catch(SQLException e){} 3p'I5,}
DBUtils.closeConnection(conn); Cid
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} GmP@;[H"
} zO iu5
public long getLast(){ 1Yn
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return lastExecuteTime; S.f5v8
} %ALwz[~]
public void run(){ 1{JV}O
long now = System.currentTimeMillis(); O`<KwUx !
if ((now - lastExecuteTime) > executeSep) { j{Q9{}<e
//System.out.print("lastExecuteTime:"+lastExecuteTime);
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//System.out.print(" now:"+now+"\n"); hr)B[<9
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); aYSCw3C<
lastExecuteTime=now; t)}scf&^x
executeUpdate(); _/tHD]um
} 9c("x%nLpB
else{ .P"D
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); l~$+,U&XNe
} IqoR7ajA
} 5wDg'X]>V
} N=7pK&NHSG
//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 @nCd
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类写好了,下面是在JSP中如下调用。 #%h-[/
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<% h[@tZ(jrY
CountBean cb=new CountBean(); 73\JwOn~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); &eX!#nQ_.
CountCache.add(cb); |Ur"&
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out.print(CountCache.list.size()+"<br>"); {fjdr
CountControl c=new CountControl(); XY3v_5~/1F
c.run(); ZNvEW
out.print(CountCache.list.size()+"<br>"); O[ef#R!
%>