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: \}p6v }
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CountBean.java r[lF<2&*R
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/* aVK3?y2
* CountData.java D"ND+*Q[X
* b\-&sM(W"
* Created on 2007年1月1日, 下午4:44 E
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* )6|yb65ZUX
* To change this template, choose Tools | Options and locate the template under S"OR%
* the Source Creation and Management node. Right-click the template and choose rdJ d#S
* Open. You can then make changes to the template in the Source Editor. XT@-$%u
*/ ?<(m
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package com.tot.count; lzYnw)Pv
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/** *:L?#Bw
* Z; A`oKd
* @author /4`
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*/ YwZ
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public class CountBean { Qzlo'e1
private String countType; V-Cv,8
int countId; d*~ICir7
/** Creates a new instance of CountData */ G-?d3n
public CountBean() {} YRh BRE
public void setCountType(String countTypes){ Y6Lf@}2(i
this.countType=countTypes; (fCXxyZrr
} mo[Zb0>
public void setCountId(int countIds){
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this.countId=countIds; 6y6<JR-V2k
} ~:3QBMk::
public String getCountType(){ DsT>3
return countType; ,]+z)
} \hM|(*DL
public int getCountId(){ Bc6|n :;u
return countId; }RwSp!}C
} S%yd5<%_
} a^=-Mp
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CountCache.java yjhf
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/* TW[_Ko86
* CountCache.java 21< j\
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* Created on 2007年1月1日, 下午5:01 &<UMBAS
* c2e
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* To change this template, choose Tools | Options and locate the template under ?zQA
* the Source Creation and Management node. Right-click the template and choose K9OYri^TQ
* Open. You can then make changes to the template in the Source Editor. M
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*/ .8P.)%
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package com.tot.count; }(1JaG
import java.util.*; 2U; t(,dn'
/** m<0&~rg
* WV #%PJ
* @author v7DE
*/ _ B5gR
public class CountCache { OujCb^Rm
public static LinkedList list=new LinkedList(); 'rr^2d]`ST
/** Creates a new instance of CountCache */ il \$@Bn
public CountCache() {} p~9vP)74u
public static void add(CountBean cb){ OnK~3j
if(cb!=null){ D;_ MPN[
list.add(cb); G=A,9@+c
} T`Mf]s)*
} JXu$ew>q
} ,;(PwJe
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CountControl.java &&VqD
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/* rwG CUo6Z
* CountThread.java 86\S?=J-b
* U)o$WH.b
* Created on 2007年1月1日, 下午4:57 I;Bjfv5
* e{v=MxO=S
* To change this template, choose Tools | Options and locate the template under Fm #w2o
* the Source Creation and Management node. Right-click the template and choose JM\m)RH0
* Open. You can then make changes to the template in the Source Editor. r%.do;5
*/ sRrzp=D
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package com.tot.count; "sl1vzRN
import tot.db.DBUtils; ;\\@q"n%<
import java.sql.*; *
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/** ltD37QZQ
* \@1=stK:F
* @author k:#P|z$UD
*/ ,iv|Pq$!
public class CountControl{ ")!,ZD
private static long lastExecuteTime=0;//上次更新时间 #*g5u{k'P
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `zE}1M%y
/** Creates a new instance of CountThread */ %LZ({\5K#f
public CountControl() {} a\:VREKj,
public synchronized void executeUpdate(){ ?zsB6B?;
Connection conn=null; 8krpowVs~
PreparedStatement ps=null; cPU/tkc
try{ rn=m\Gv
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conn = DBUtils.getConnection(); sSQs#+&=[
conn.setAutoCommit(false); `A,g] 1C:
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); A%{W{UP8N
for(int i=0;i<CountCache.list.size();i++){ LJ(1RK GCz
CountBean cb=(CountBean)CountCache.list.getFirst(); A^2Uzmzl?
CountCache.list.removeFirst(); &g~ wS@
ps.setInt(1, cb.getCountId()); KhW;RD
ps.executeUpdate();⑴ $LLA,?;!
//ps.addBatch();⑵ t6A:ZmG_
} 1s{^X
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//int [] counts = ps.executeBatch();⑶ {nvLPUL
conn.commit(); GKFq+]W
}catch(Exception e){ 3RR_fmMT)
e.printStackTrace(); 1[t=XDz/e
} finally{ U=o"32n+
try{ zKsz*xv6b
if(ps!=null) { v!FMs<
ps.clearParameters(); {s_+?<l
ps.close(); Gsc\/4Wx
ps=null; Z+StB15
} l$jxLZ
}catch(SQLException e){} m~D&gGFt
DBUtils.closeConnection(conn); 0`I-2M4F*Q
} Iy.rqc/86
} -pE(_
public long getLast(){ pOrWg@<\L
return lastExecuteTime; Xe^Cn
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} z8J."27ND
public void run(){ fuB)qt!E
long now = System.currentTimeMillis(); a<A+4uXyD
if ((now - lastExecuteTime) > executeSep) { ZZ.m(ATR
//System.out.print("lastExecuteTime:"+lastExecuteTime); 8B#GbS
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//System.out.print(" now:"+now+"\n"); yx<WSgWZ[
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !Y:0c#MPH
lastExecuteTime=now; VT.;:Q
executeUpdate(); 0^8)jpL$<9
} 5zIAhg@o:q
else{ *k1<:
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); mnID3=JF
} rX; Ys2vQ*
} 1 `7<2w
} E3*\
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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 ,~);EC=`
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类写好了,下面是在JSP中如下调用。 CY&
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