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: Gd`qZqx#
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CountBean.java j|9;")
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/* {IJV(%E
* CountData.java <0vQHND,3
* ZPn`.Qc
* Created on 2007年1月1日, 下午4:44 Rk56H
* ' eO4h^
* To change this template, choose Tools | Options and locate the template under @"-<m|lM
* the Source Creation and Management node. Right-click the template and choose w`,[w,t
* Open. You can then make changes to the template in the Source Editor.
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*/ 1b
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package com.tot.count; dl@
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/** 07Yh
* q*TH),)J
* @author R{5Qb?&wOp
*/ fzRzkn:=
public class CountBean { Z&@X4X"q
private String countType; Y.3]vno?X
int countId; Q1IN@Db}y
/** Creates a new instance of CountData */
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public CountBean() {} 0K`3BuBs
public void setCountType(String countTypes){ rv1kIc5Za<
this.countType=countTypes; W *0XV
} AQU4~g
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public void setCountId(int countIds){ 9`i=kp
this.countId=countIds; Lg[*P8wE
} l.\Fr+*ej
public String getCountType(){ uI@:\Rss
return countType; uO>$,s
} 6*gMG3
public int getCountId(){ :Sk0?WU
return countId; *qj @y'1\
} Pon 2!$
} u^|XQWR$:
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CountCache.java a9mLPP
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/* Kjc"K36{L
* CountCache.java JGX E{FT
* gpVZZ:~
* Created on 2007年1月1日, 下午5:01 _)O1v%]"4
* m,,-rC
* To change this template, choose Tools | Options and locate the template under v#@"Evh7
* the Source Creation and Management node. Right-click the template and choose (Ybc~M)z
* Open. You can then make changes to the template in the Source Editor. j1*'yvGM
*/ nZ>qM]">u
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package com.tot.count; 9TBkVbqV
import java.util.*; c^><^LGb
/** W~aVwO'(
* 'U.)f@L#w
* @author *?Nrx=O*
*/ G)]'>m<y
public class CountCache { B^P)(Nu+
public static LinkedList list=new LinkedList(); Q4Zuz)r*
/** Creates a new instance of CountCache */ $[T^S
public CountCache() {} F$ShhZgi
public static void add(CountBean cb){ *9y)B|P^
if(cb!=null){ Hgu$)yhlj
list.add(cb); ('xIFi
} ^.p({6H
} $~!%Px)
} Ci4`,
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CountControl.java 9Bvi2
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/* Bha#=>4FU
* CountThread.java de1cl<
* f6vhW66:?x
* Created on 2007年1月1日, 下午4:57 U(P^-J<n1
* 1fm4:xHH
* To change this template, choose Tools | Options and locate the template under kd)Q$RA(
* the Source Creation and Management node. Right-click the template and choose 3)88B"E
* Open. You can then make changes to the template in the Source Editor. .A<G$ db
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*/ FM;NA{
#%O|P&rA
package com.tot.count; CuC1s>
import tot.db.DBUtils; M<^]Ywq*p
import java.sql.*; e+6mbJ7y
/** @&?E3?5ll
* )UbPG`x8
* @author a?jUm.
*/ pqe7a3jr
public class CountControl{ ]xC#XYE:dy
private static long lastExecuteTime=0;//上次更新时间 3.+TM]RYN
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 p[R4!if2
/** Creates a new instance of CountThread */ ?C)a0>L
public CountControl() {} lC/1,Z/M
public synchronized void executeUpdate(){ 2t 6m#
Connection conn=null; h ` qlI1]
PreparedStatement ps=null; b.I_
try{ WoM;) Q
conn = DBUtils.getConnection(); Ha~F&H|"O
conn.setAutoCommit(false); Em)U`"j/9
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); j5m KJC
for(int i=0;i<CountCache.list.size();i++){ cq]JD6937
CountBean cb=(CountBean)CountCache.list.getFirst(); T5nBvSVv'
CountCache.list.removeFirst(); 2[|52+zhc
ps.setInt(1, cb.getCountId()); /T_{k.
ps.executeUpdate();⑴ U\*]cw
//ps.addBatch();⑵ `-t8ag3
} =LXjq~p
//int [] counts = ps.executeBatch();⑶ e}dGK=`
conn.commit(); &1/OwTI4J
}catch(Exception e){ 1WjNF i
e.printStackTrace(); 37apOK4+
} finally{ :o~]FVf
try{ YRg"{[+#]k
if(ps!=null) { .~$!BWP
ps.clearParameters(); Fn>KdoByN
ps.close();
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ps=null; lfvt9!SJ+/
} /!Ay12lKE}
}catch(SQLException e){} >|X )
DBUtils.closeConnection(conn); CbGfVdw/c
} a\m_Q{:
} JBhM*-t(M1
public long getLast(){ GP>\3@>
return lastExecuteTime; *+OS;R1<
} Vv54;Js9
public void run(){ .n n&K}h
long now = System.currentTimeMillis(); CvHE7H|-{
if ((now - lastExecuteTime) > executeSep) { H )51J:4
//System.out.print("lastExecuteTime:"+lastExecuteTime); X [<%T}s#
//System.out.print(" now:"+now+"\n"); e Fh7#~m
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 7s0\`eXo/
lastExecuteTime=now; l+#J oc<8
executeUpdate(); qk~m\U8r
} NSa6\.W)
else{ #x qiGK
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); aFaioE#h(
} }?\^^v h7
} rFUR9O.{E
} 9X?RJ."J
//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 7u{V1_n1
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类写好了,下面是在JSP中如下调用。 ?3lAogB
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<% b'``0OB )
CountBean cb=new CountBean(); &~Pk*A_:
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ,<N{Y[n]e
CountCache.add(cb); SJ91(K
out.print(CountCache.list.size()+"<br>"); %s497'
CountControl c=new CountControl(); uu9IUqEq2
c.run(); Esu{c9,
out.print(CountCache.list.size()+"<br>"); p}3` "L=
%>