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: SHSfe{n
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CountBean.java &ID! lEd
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/* 8JQ\eF$ma
* CountData.java 4 7mT
* S8kzAT
* Created on 2007年1月1日, 下午4:44 :81d~f7
* hP'4PLK
* To change this template, choose Tools | Options and locate the template under w2s06`g
* the Source Creation and Management node. Right-click the template and choose G0Z5 h
* Open. You can then make changes to the template in the Source Editor. 7@g0>1Fz
*/ }pf|GdL
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package com.tot.count; S,5>/'fy0
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/** u23_*W\
* JvvN>bg
* @author xDl;
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*/ ig YYkt
public class CountBean { smQl^
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private String countType; uD?G\"L
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int countId; !x
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/** Creates a new instance of CountData */ uh.;Jj;
public CountBean() {} 5oCg&aT
public void setCountType(String countTypes){ ?Be}{Qqlg
this.countType=countTypes; {irc~||4
} BtbU?t
public void setCountId(int countIds){ >`WfY(Lq
this.countId=countIds; sCt)Yp+8}B
} S2\;\?]^~
public String getCountType(){ $+n6V2^K)7
return countType; +'5I8FE-
} Djc-f
public int getCountId(){ Y-y yg4JH
return countId; LWTPNp:"{w
} R3a}YwJFXF
} =&pLlG
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CountCache.java GrJLQO0$N
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/* ;>5`Y8s6
* CountCache.java =+wd"Bu
* >l AtfN='
* Created on 2007年1月1日, 下午5:01 *-5N0K<kQ
* kD;pj3o&"2
* To change this template, choose Tools | Options and locate the template under $F#
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* the Source Creation and Management node. Right-click the template and choose =c*l!."0
* Open. You can then make changes to the template in the Source Editor. p$|7T31 *
*/ 3BCD0
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package com.tot.count;
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import java.util.*; O8bxd6xb
/** lTq"j?#E]m
* TE+>|}]R
* @author b=/'cQ
*/ U7D!w$4
public class CountCache { V+lF|CZb5
public static LinkedList list=new LinkedList(); lD3nz<p
/** Creates a new instance of CountCache */ 1VM2CgR a
public CountCache() {} YVDFcN9v
public static void add(CountBean cb){ ]r|oNGD)G
if(cb!=null){ A|+QUPD
list.add(cb); @
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} S$Zi{bU`G
} =8?Kn@nMN
} -%yrs6
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CountControl.java sNo8o1Hby
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/* v}Ju2 }IK
* CountThread.java '{jr9Vh
* b@;Wh-{d
* Created on 2007年1月1日, 下午4:57 qiOJ:'@
* }Rw ,4
* To change this template, choose Tools | Options and locate the template under &R%'s1]o
* the Source Creation and Management node. Right-click the template and choose [|KvlOvP
* Open. You can then make changes to the template in the Source Editor. =zyA~}M2
*/ {jz`K1
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package com.tot.count; z2uL[deN'"
import tot.db.DBUtils; =,(TP
import java.sql.*; [^5;XD:%&l
/** yk`qF'4]
* %A$&9c%
* @author 9dhEQ=K{3
*/ Q# B0JT1
public class CountControl{ T[bC Y 6
private static long lastExecuteTime=0;//上次更新时间 e(?w h
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8#7qHT;cx
/** Creates a new instance of CountThread */ Fye>H6MU
public CountControl() {} W}CM;~*L
public synchronized void executeUpdate(){ (jc& Fk
Connection conn=null; ;KlYiu
PreparedStatement ps=null; X@\W*
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try{ wfmM`4Y
conn = DBUtils.getConnection(); Vb(b3
conn.setAutoCommit(false); PW5]+ |#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); gYB!KM *v
for(int i=0;i<CountCache.list.size();i++){ gA!@oiq@
CountBean cb=(CountBean)CountCache.list.getFirst(); %tyo(HZQ
CountCache.list.removeFirst(); J ay"
ps.setInt(1, cb.getCountId()); >[fu&r1
ps.executeUpdate();⑴ *5%vU|9b
//ps.addBatch();⑵ B{nwQC b
} ^viabkf C
//int [] counts = ps.executeBatch();⑶ $^ws#}j
conn.commit(); 0X=F(,>9
}catch(Exception e){ @AEH?gOX
e.printStackTrace(); f4"UI-8;n
} finally{ =&bI-
try{ hIJtu;}zU
if(ps!=null) { >rCD5#DG
ps.clearParameters(); kFn/dQ4|
ps.close(); . <"XE7
ps=null; Jb QK$[z"
} 8 "l
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}catch(SQLException e){} 94"+l@K
DBUtils.closeConnection(conn); Lx0nLJ\
} VeYT[Us"
} n)e2?
public long getLast(){ O3} JOv_
return lastExecuteTime; ?=? _32O
} yLnQ9BXB&
public void run(){ qjB:6Jq4q
long now = System.currentTimeMillis(); 'C1lP)S5
if ((now - lastExecuteTime) > executeSep) { eZ$7VWG#
//System.out.print("lastExecuteTime:"+lastExecuteTime); u m9yO'[C
//System.out.print(" now:"+now+"\n"); =;rLv7(a
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); gP2zDI
lastExecuteTime=now; xXe3E&
executeUpdate(); \P<aK$g
} ~g{j)"1
else{ Q{l,4P
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); _~<sb,W
} ^A$=6=CX
} ,
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} xfYKUOp/
//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 |N)Ik8
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类写好了,下面是在JSP中如下调用。 ingG
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<% F@BpAl
CountBean cb=new CountBean(); 1m*)MZ)
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); d?zSwLsl
CountCache.add(cb); J p'^!
out.print(CountCache.list.size()+"<br>"); 8 A>OQR
CountControl c=new CountControl(); i2=- su
c.run(); 1oQw)X
out.print(CountCache.list.size()+"<br>"); &6eo;8
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