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: PFn[[~5V
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CountBean.java 1X:whS5S
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/* u C8T!z
* CountData.java 0 Ukl#6
* W&re;?Z{ke
* Created on 2007年1月1日, 下午4:44 Q9'p3"yoE
* $4~}_phi
* To change this template, choose Tools | Options and locate the template under -H]f@|AOw
* the Source Creation and Management node. Right-click the template and choose `\FjO"
* Open. You can then make changes to the template in the Source Editor. o5G "J"vxe
*/ 8LM1oal}
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package com.tot.count; Oj|p`Dzh
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/** CzsY=DBH=
* >yHnz?bf@
* @author !?-5hh1\
*/ r#Oz0=0u
public class CountBean { _w,0wn9N$
private String countType; Ak-7}i
int countId; Xq)%w#l5?
/** Creates a new instance of CountData */ '!L1z45
public CountBean() {} />I8nS}T
public void setCountType(String countTypes){ 0*M}QXt
this.countType=countTypes; Y,Zv0-"
} _CwQ}n*
public void setCountId(int countIds){ %+W
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this.countId=countIds; 1kw4'#J8
} %IXW|mi
public String getCountType(){ %L|bF"K5;
return countType; $U.'K!B
} *t*&Q /W
public int getCountId(){ r%mTOLef
return countId; \B ^sJ[n
} G+^$JN=
} |Ie`L("
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CountCache.java e;u8G/
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/* ->9xw
* CountCache.java <%JO3E
* cQ ;Ry!$
* Created on 2007年1月1日, 下午5:01 8t
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* x{o5Ha{
* To change this template, choose Tools | Options and locate the template under [jn;|
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* the Source Creation and Management node. Right-click the template and choose BiCa "
* Open. You can then make changes to the template in the Source Editor. ,ST.pu8N.
*/ M@@O50~
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package com.tot.count; v23Uh2[@Yy
import java.util.*; *pUV-^uo
/** xVX||rrh
* ]c=1-Rl
* @author 0BD((oNg
*/ (SVr>|Db
public class CountCache { &+iW:
public static LinkedList list=new LinkedList(); D)Rf
/** Creates a new instance of CountCache */ To?
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public CountCache() {} a-2
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public static void add(CountBean cb){ Hu2g (!
if(cb!=null){ :R\v# )C
list.add(cb); eyjUNHeh#
} la 7QN QW
} ]lYEJ`
} ",_
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CountControl.java TN_$E&69I
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/* -{SiK
* CountThread.java B;je|M!d
* ^#nWgo7{7
* Created on 2007年1月1日, 下午4:57 )#Bfd(F
* *%BI*p
* To change this template, choose Tools | Options and locate the template under ,w>?N\w!}
* the Source Creation and Management node. Right-click the template and choose JLn<,Gn)<\
* Open. You can then make changes to the template in the Source Editor. 9?,.zc^
*/ z5'nS&x
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package com.tot.count; f+~!s 2uw
import tot.db.DBUtils; eakIK+-21y
import java.sql.*; !jnIXvT1qy
/** PdBhX
* }Cg~::,"
* @author N0hU~| /
*/ )B4c;O4t
public class CountControl{ =nZd"t'p|
private static long lastExecuteTime=0;//上次更新时间 CxQ,yd;>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Khd ,|pM
/** Creates a new instance of CountThread */ Pk_{{Z(1o
public CountControl() {} J :(\o=5 5
public synchronized void executeUpdate(){ FWN%JCOj@
Connection conn=null; N\&;R$[9:
PreparedStatement ps=null; MX\-)e#
try{ r0bPaAKw
conn = DBUtils.getConnection(); T
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conn.setAutoCommit(false); >vy+U
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 1e} 3L2rC
for(int i=0;i<CountCache.list.size();i++){ gOAluP
CountBean cb=(CountBean)CountCache.list.getFirst(); =(\!,S'
CountCache.list.removeFirst(); 4=:eGlU93U
ps.setInt(1, cb.getCountId()); :!hH`l}p
ps.executeUpdate();⑴ !S{<Xc'wv
//ps.addBatch();⑵ !WnI`
} +[9"M+4-
//int [] counts = ps.executeBatch();⑶ XLxr~Yo
conn.commit(); <Rt@z|Zv
}catch(Exception e){ B(dL`]@Xm
e.printStackTrace(); nJg2O@mRJ
} finally{ Ma#-'J
try{ m/Z_ HER^
if(ps!=null) { 5C?1`-&65V
ps.clearParameters(); :h~!#;w_
ps.close(); *^_!W'T{j
ps=null; \M@8# k|
} h_!"CF<n
}catch(SQLException e){} gv-k}2u_
DBUtils.closeConnection(conn); Vrh],xK7
} MEUqQ4/Gl
} Hm*#HT%#
public long getLast(){ T,>e\
return lastExecuteTime; 4*W7{MPY
} 4iW2hV@m
public void run(){ TD7ONa-,
long now = System.currentTimeMillis(); `I$A;OPK7
if ((now - lastExecuteTime) > executeSep) { =1capix 1r
//System.out.print("lastExecuteTime:"+lastExecuteTime); $0t
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//System.out.print(" now:"+now+"\n"); gs>cx]>
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ~!kbB4`WK
lastExecuteTime=now; !6C d.fpWL
executeUpdate(); N/VIP0Kb
} zY-m]7Yf
else{ tEs$+b
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ZeZwzH)BD
} =T]OYk
} xd@DN;e
} p.|;
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//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 A[bxxQSP\H
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类写好了,下面是在JSP中如下调用。 dz 2d`=`3
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<% ,V?,I9qf
CountBean cb=new CountBean(); jU$PO\UTk
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Xv:IbM>
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CountCache.add(cb); wBET.l'd
out.print(CountCache.list.size()+"<br>"); i|mA/
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CountControl c=new CountControl(); sTz*tSwQv
c.run(); k_B^2=
out.print(CountCache.list.size()+"<br>"); H"l'E9k.&p
%>